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absorbers</title> <meta name="description" content="Search results for: vibration absorbers"> <meta name="keywords" content="vibration absorbers"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none 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action="https://publications.waset.org/abstracts/search"> <div id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="vibration absorbers"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 819</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: vibration absorbers</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">819</span> Investigation of Multiple Dynamic Vibration Absorbers' Performance in Overhead Transmission Lines</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Pedro%20F.%20D.%20Oliveira">Pedro F. D. Oliveira</a>, <a href="https://publications.waset.org/abstracts/search?q=Rangel%20S.%20Maia"> Rangel S. Maia</a>, <a href="https://publications.waset.org/abstracts/search?q=Aline%20S.%20Paula"> Aline S. Paula</a> </p> <p class="card-text"><strong>Abstract:</strong></p> As the electric energy consumption grows, the necessity of energy transmission lines increases. One of the problems caused by an oscillatory response to dynamical loads (such as wind effects) in transmission lines is the cable fatigue. Thus, the dynamical behavior of transmission cables understanding and its control is extremely important. The socioeconomic damage caused by a failure in these cables can be quite significant, from large economic losses to energy supply interruption in large regions. Dynamic Vibration Absorbers (DVA) are oscillatory elements used to mitigate the vibration of a primary system subjected to harmonic excitation. The positioning of Stockbridge (DVA for overhead transmission lines) plays an important role in mitigating oscillations of transmission lines caused by airflows. Nowadays, the positioning is defined by technical standards or commercial software. The aim of this paper is to conduct an analysis of multiple DVAs performances in cable conductors of overhead transmission lines. The cable is analyzed by a finite element method and the model is calibrated by experimental results. DVAs performance is analyzed by evaluating total cable energy, and a study of multiple DVAs positioning is conducted. The results are compared to the existing regulations showing situations where proper positioning, different from the standard, can lead to better performance of the DVA. Results also show situations where the use of multiple DVAs is appropriate. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dynamical%20vibration%20absorber" title="dynamical vibration absorber">dynamical vibration absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20method" title=" finite element method"> finite element method</a>, <a href="https://publications.waset.org/abstracts/search?q=overhead%20transmission%20lines" title=" overhead transmission lines"> overhead transmission lines</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20dynamics" title=" structural dynamics"> structural dynamics</a> </p> <a href="https://publications.waset.org/abstracts/104551/investigation-of-multiple-dynamic-vibration-absorbers-performance-in-overhead-transmission-lines" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/104551.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">127</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">818</span> The Effect of Degraded Shock Absorbers on the Safety-Critical Stationary and Non-Stationary Lateral Dynamics of Passenger Cars</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tobias%20Schramm">Tobias Schramm</a>, <a href="https://publications.waset.org/abstracts/search?q=G%C3%BCnther%20Prokop"> Günther Prokop</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The average age of passenger cars is rising steadily around the world. Older vehicles are more sensitive to the degradation of chassis components. A higher age and a higher mileage of passenger cars correlate with an increased failure rate of vehicle shock absorbers. The most common degradation mechanism of vehicle shock absorbers is the loss of oil and gas. It is not yet fully understood how the loss of oil and gas in twin-tube shock absorbers affects the lateral dynamics of passenger cars. The aim of this work is to estimate the effect of degraded twin-tube shock absorbers of passenger cars on their safety-critical lateral dynamics. A characteristic curve-based five-mass full vehicle model and a semi-physical phenomenological shock absorber model were set up, parameterized and validated. The shock absorber model is able to reproduce the damping characteristics of vehicle twin-tube shock absorbers with oil and gas loss for various excitations. The full vehicle model was used to simulate stationary cornering and steering wheel angle step maneuvers on road classes A to D. The simulations were carried out in a realistic parameter space in order to demonstrate the influence of various vehicle characteristics on the effect of degraded shock absorbers. As a result, it was shown that degraded shock absorbers have a negative effect on the understeer gradient of vehicles. For stationary lateral dynamics, degraded shock absorbers for high road excitations reduce the maximum lateral accelerations. Degraded rear axle shock absorbers can change the understeer gradient of a vehicle in the direction of oversteer. Degraded shock absorbers also lead to increased rolling angles. Furthermore, degraded shock absorbers have a major impact on driving stability during steering wheel angle steps. Degraded rear axle shock absorbers, in particular, can lead to unstable handling. Especially the tire stiffness, the unsprung mass and the stabilizer stiffness influence the effect of degraded shock absorbers on the lateral dynamics of passenger cars. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=driving%20dynamics" title="driving dynamics">driving dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=numerical%20simulation" title=" numerical simulation"> numerical simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=road%20safety" title=" road safety"> road safety</a>, <a href="https://publications.waset.org/abstracts/search?q=shock%20absorber%20degradation" title=" shock absorber degradation"> shock absorber degradation</a>, <a href="https://publications.waset.org/abstracts/search?q=stationary%20and%20nonstationary%20lateral%20dynamics." title=" stationary and nonstationary lateral dynamics."> stationary and nonstationary lateral dynamics.</a> </p> <a href="https://publications.waset.org/abstracts/194638/the-effect-of-degraded-shock-absorbers-on-the-safety-critical-stationary-and-non-stationary-lateral-dynamics-of-passenger-cars" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/194638.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">7</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">817</span> Electromagnetic Radiation Absorbers on the Basis of Fibrous Materials with the Content of Allotropic Carbon Forms</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Elena%20S.%20%20Belousova">Elena S. Belousova</a>, <a href="https://publications.waset.org/abstracts/search?q=Olga%20V.%20Boiprav"> Olga V. Boiprav</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A technique for incorporating particles of allotropic forms of carbon into a fibrous material has been developed. It can be used for the manufacture of composite electromagnetic radiation absorbers. The frequency characteristics of electromagnetic radiation reflection and transmission coefficients in the microwave range of absorbers on the basis of powdered carbon black, activated carbon, shungite, graphite, manufactured in accordance with the developed technique, have been studied. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=carbon" title="carbon">carbon</a>, <a href="https://publications.waset.org/abstracts/search?q=graphite" title=" graphite"> graphite</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20radiation%20absorber" title=" electromagnetic radiation absorber"> electromagnetic radiation absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=shungite" title=" shungite"> shungite</a> </p> <a href="https://publications.waset.org/abstracts/121253/electromagnetic-radiation-absorbers-on-the-basis-of-fibrous-materials-with-the-content-of-allotropic-carbon-forms" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/121253.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">163</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">816</span> Experimental Investigation of Beams Having Spring Mass Resonators</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Somya%20R.%20Patro">Somya R. Patro</a>, <a href="https://publications.waset.org/abstracts/search?q=Arnab%20Banerjee"> Arnab Banerjee</a>, <a href="https://publications.waset.org/abstracts/search?q=G.%20V.%20Ramana"> G. V. Ramana</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A flexural beam carrying elastically mounted concentrated masses, such as engines, motors, oscillators, or vibration absorbers, is often encountered in mechanical, civil, and aeronautical engineering domains. To prevent resonance conditions, the designers must predict the natural frequencies of such a constrained beam system. This paper investigates experimental and analytical studies on vibration suppression in a cantilever beam with a tip mass with the help of spring-mass to achieve local resonance conditions. The system consists of a 3D printed polylactic acid (PLA) beam screwed at the base plate of the shaker system. The top of the free end is connected by an accelerometer which also acts as a tip mass. A spring and a mass are attached at the bottom to replicate the mechanism of the spring-mass resonator. The Fast Fourier Transform (FFT) algorithm converts time acceleration plots into frequency amplitude plots from which transmittance is calculated as a function of the excitation frequency. The mathematical formulation is based on the transfer matrix method, and the governing differential equations are based on Euler Bernoulli's beam theory. The experimental results are successfully validated with the analytical results, providing us essential confidence in our proposed methodology. The beam spring-mass system is then converted to an equivalent two-degree of freedom system, from which frequency response function is obtained. The H2 optimization technique is also used to obtain the closed-form expression of optimum spring stiffness, which shows the influence of spring stiffness on the system's natural frequency and vibration response. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=euler%20bernoulli%20beam%20theory" title="euler bernoulli beam theory">euler bernoulli beam theory</a>, <a href="https://publications.waset.org/abstracts/search?q=fast%20fourier%20transform" title=" fast fourier transform"> fast fourier transform</a>, <a href="https://publications.waset.org/abstracts/search?q=natural%20frequencies" title=" natural frequencies"> natural frequencies</a>, <a href="https://publications.waset.org/abstracts/search?q=polylactic%20acid" title=" polylactic acid"> polylactic acid</a>, <a href="https://publications.waset.org/abstracts/search?q=transmittance" title=" transmittance"> transmittance</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20absorbers" title=" vibration absorbers"> vibration absorbers</a> </p> <a href="https://publications.waset.org/abstracts/153353/experimental-investigation-of-beams-having-spring-mass-resonators" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/153353.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">104</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">815</span> Bidirectional Pendulum Vibration Absorbers with Homogeneous Variable Tangential Friction: Modelling and Design</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Emiliano%20Matta">Emiliano Matta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Passive resonant vibration absorbers are among the most widely used dynamic control systems in civil engineering. They typically consist in a single-degree-of-freedom mechanical appendage of the main structure, tuned to one structural target mode through frequency and damping optimization. One classical scheme is the pendulum absorber, whose mass is constrained to move along a curved trajectory and is damped by viscous dashpots. Even though the principle is well known, the search for improved arrangements is still under way. In recent years this investigation inspired a type of bidirectional pendulum absorber (BPA), consisting of a mass constrained to move along an optimal three-dimensional (3D) concave surface. For such a BPA, the surface principal curvatures are designed to ensure a bidirectional tuning of the absorber to both principal modes of the main structure, while damping is produced either by horizontal viscous dashpots or by vertical friction dashpots, connecting the BPA to the main structure. In this paper, a variant of BPA is proposed, where damping originates from the variable tangential friction force which develops between the pendulum mass and the 3D surface as a result of a spatially-varying friction coefficient pattern. Namely, a friction coefficient is proposed that varies along the pendulum surface in proportion to the modulus of the 3D surface gradient. With such an assumption, the dissipative model of the absorber can be proven to be nonlinear homogeneous in the small displacement domain. The resulting homogeneous BPA (HBPA) has a fundamental advantage over conventional friction-type absorbers, because its equivalent damping ratio results independent on the amplitude of oscillations, and therefore its optimal performance does not depend on the excitation level. On the other hand, the HBPA is more compact than viscously damped BPAs because it does not need the installation of dampers. This paper presents the analytical model of the HBPA and an optimal methodology for its design. Numerical simulations of single- and multi-story building structures under wind and earthquake loads are presented to compare the HBPA with classical viscously damped BPAs. It is shown that the HBPA is a promising alternative to existing BPA types and that homogeneous tangential friction is an effective means to realize systems provided with amplitude-independent damping. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=amplitude-independent%20damping" title="amplitude-independent damping">amplitude-independent damping</a>, <a href="https://publications.waset.org/abstracts/search?q=homogeneous%20friction" title=" homogeneous friction"> homogeneous friction</a>, <a href="https://publications.waset.org/abstracts/search?q=pendulum%20nonlinear%20dynamics" title=" pendulum nonlinear dynamics"> pendulum nonlinear dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20control" title=" structural control"> structural control</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20resonant%20absorbers" title=" vibration resonant absorbers"> vibration resonant absorbers</a> </p> <a href="https://publications.waset.org/abstracts/93327/bidirectional-pendulum-vibration-absorbers-with-homogeneous-variable-tangential-friction-modelling-and-design" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/93327.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">148</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">814</span> Mode-Locked Fiber Laser Using Charcoal and Graphene Saturable Absorbers to Generate 20-GHz and 50-GHz Pulse Trains, Respectively</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ashiq%20Rahman">Ashiq Rahman</a>, <a href="https://publications.waset.org/abstracts/search?q=Sunil%20Thapa"> Sunil Thapa</a>, <a href="https://publications.waset.org/abstracts/search?q=Shunyao%20Fan"> Shunyao Fan</a>, <a href="https://publications.waset.org/abstracts/search?q=Niloy%20K.%20Dutta"> Niloy K. Dutta</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A 20-GHz and a 50-GHz pulse train are generated using a fiber ring laser setup that incorporates Rational Harmonic Mode Locking. Two separate experiments were carried out using charcoal nanoparticles and graphene nanoparticles acting as saturable absorbers to reduce the pulse width generated from rational harmonic mode-locking (RHML). Autocorrelator trace shows that the pulse width is reduced from 5.6-ps to 3.2-ps using charcoal at 20-GHz, and to 2.7-ps using graphene at 50-GHz repetition rates, which agrees with the simulation findings. Numerical simulations have been carried out to study the effect of varying the linear and nonlinear absorbance parameters of both absorbers on output pulse widths. Experiments closely agree with the simulations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fiber%20optics" title="fiber optics">fiber optics</a>, <a href="https://publications.waset.org/abstracts/search?q=fiber%20lasers" title=" fiber lasers"> fiber lasers</a>, <a href="https://publications.waset.org/abstracts/search?q=mode%20locking" title=" mode locking"> mode locking</a>, <a href="https://publications.waset.org/abstracts/search?q=saturable%20absorbers" title=" saturable absorbers"> saturable absorbers</a> </p> <a href="https://publications.waset.org/abstracts/157130/mode-locked-fiber-laser-using-charcoal-and-graphene-saturable-absorbers-to-generate-20-ghz-and-50-ghz-pulse-trains-respectively" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/157130.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">97</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">813</span> Development of Al Foam by a Low-Cost Salt Replication Method for Industrial Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=B.%20Soni">B. Soni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Biswas"> S. Biswas</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Metal foams of Al find diverse applications in several industrial sectors such as in automotive and sports equipment industry as impact, acoustic and vibration absorbers, the aerospace industry as structural components in turbines and spatial cones, in the naval industry as low frequency vibration absorbers, and in construction industry as sound barriers inside tunnels, as fire proof materials and structure protection systems against explosions and even in heat exchangers, orthopedic components, and decorative items. Here, we report on the development of Al foams by a low cost and convenient technique of salt replication method with efficient control over size, geometry and distribution of the pores. Sodium bicarbonate was used as the foaming agent to form the porous refractory salt pattern. The mixed refractory salt slurry was microwave dried followed by sintering for selected time periods. Molten Al was infiltrated into the salt pattern in an inert atmosphere at a pressure of 2 bars. The final products were obtained by leaching out the refractory salt pattern. Mechanical properties of the derived samples were studied with a universal testing machine. The results were analyzed in correlation with their microstructural features evaluated with a scanning electron microscope (SEM). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=metal%20foam" title="metal foam">metal foam</a>, <a href="https://publications.waset.org/abstracts/search?q=Al" title=" Al"> Al</a>, <a href="https://publications.waset.org/abstracts/search?q=salt%20replication%20method" title=" salt replication method"> salt replication method</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20properties" title=" mechanical properties"> mechanical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=SEM" title=" SEM"> SEM</a> </p> <a href="https://publications.waset.org/abstracts/22450/development-of-al-foam-by-a-low-cost-salt-replication-method-for-industrial-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22450.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">352</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">812</span> Vibration Mitigation in Partially Liquid-Filled Vessel Using Passive Energy Absorbers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Maor%20Farid">Maor Farid</a>, <a href="https://publications.waset.org/abstracts/search?q=Oleg%20Gendelman"> Oleg Gendelman</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The following study deals with fluid vibration of a liquid in a partially filled vessel under periodic ground excitation. This external excitation might lead to hidraulic impact applied on the vessel inner walls. In order to model these sloshing dynamic regimes, several equivalent mechanical models were suggested in the literature, such as series of pendula or mass-spring systems that are able to impact the inner tank walls. In the following study, we use the latter methodology, use parameter values documented in literature corresponding to cylindrical tanks and consider structural elasticity of the tank. The hydraulic impulses are modeled by the high-exponent potential function. Additional system parameters are found with the help of Finite-Element (FE) analysis. Model-driven stress assessment method is developed. Finally, vibration mitigation performances of both tuned mass damper (TMD) and nonlinear energy sink (NES) are examined. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=nonlinear%20energy%20sink%20%28NES%29" title="nonlinear energy sink (NES)">nonlinear energy sink (NES)</a>, <a href="https://publications.waset.org/abstracts/search?q=reduced-order%20modelling" title=" reduced-order modelling"> reduced-order modelling</a>, <a href="https://publications.waset.org/abstracts/search?q=liquid%20sloshing" title=" liquid sloshing"> liquid sloshing</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20mitigation" title=" vibration mitigation"> vibration mitigation</a>, <a href="https://publications.waset.org/abstracts/search?q=vibro-impact%20dynamics" title=" vibro-impact dynamics"> vibro-impact dynamics</a> </p> <a href="https://publications.waset.org/abstracts/83537/vibration-mitigation-in-partially-liquid-filled-vessel-using-passive-energy-absorbers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/83537.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">197</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">811</span> Coil-Over Shock Absorbers Compared to Inherent Material Damping</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Carina%20Emminger">Carina Emminger</a>, <a href="https://publications.waset.org/abstracts/search?q=Umut%20D.%20Cakmak"> Umut D. Cakmak</a>, <a href="https://publications.waset.org/abstracts/search?q=Evrim%20Burkut"> Evrim Burkut</a>, <a href="https://publications.waset.org/abstracts/search?q=Rene%20Preuer"> Rene Preuer</a>, <a href="https://publications.waset.org/abstracts/search?q=Ingrid%20Graz"> Ingrid Graz</a>, <a href="https://publications.waset.org/abstracts/search?q=Zoltan%20Major"> Zoltan Major</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Damping accompanies us daily in everyday life and is used to protect (e.g., in shoes) and make our life more comfortable (damping of unwanted motion) and calm (noise reduction). In general, damping is the absorption of energy which is either stored in the material (vibration isolation systems) or changed into heat (vibration absorbers). In case of the last, the damping mechanism can be split in active, passive, as well as semi-active (a combination of active and passive). Active damping is required to enable an almost perfect damping over the whole application range and is used, for instance, in sport cars. In contrast, passive damping is a response of the material due to external loading. Consequently, the material composition has a huge influence on the damping behavior. For elastomers, the material behavior is inherent viscoelastic, temperature, and frequency dependent. However, passive damping is not adjustable during application. Therefore, it is of importance to understand the fundamental viscoelastic behavior and the dissipation capability due to external loading. The objective of this work is to assess the limitation and applicability of viscoelastic material damping for applications in which currently coil-over shock absorbers are utilized. Coil-over shock absorbers are usually made of various mechanical parts and incorporate fluids within the damper. These shock absorbers are well-known and studied in the industry, and when needed, they can be easily adjusted during their product lifetime. In contrary, dampers made of – ideally – a single material are more resource efficient, have an easier serviceability, and are easier manufactured. However, they lack of adaptability and adjustability in service. Therefore, a case study with a remote-controlled sport car was conducted. The original shock absorbers were redesigned, and the spring-dashpot system was replaced by both an elastomer and a thermoplastic-elastomer, respectively. Here, five different formulations of elastomers were used, including a pure and an iron-particle filled thermoplastic poly(urethan) (TPU) and blends of two different poly(dimethyl siloxane) (PDMS). In addition, the TPUs were investigated as full and hollow dampers to investigate the difference between solid and structured material. To get comparative results each material formulation was comprehensively characterized, by monotonic uniaxial compression tests, dynamic thermomechanical analysis (DTMA), and rebound resilience. Moreover, the new material-based shock absorbers were compared with spring-dashpot shock absorbers. The shock absorbers were analyzed under monotonic and cyclic loading. In addition, an impact loading was applied on the remote-controlled car to measure the damping properties in operation. A servo-hydraulic high-speed linear actuator was utilized to apply the loads. The acceleration of the car and the displacement of specific measurement points were recorded while testing by a sensor and high-speed camera, respectively. The results prove that elastomers are suitable in damping applications, but they are temperature and frequency dependent. This is a limitation in applicability of viscous material damper. Feasible fields of application may be in the case of micromobility, like bicycles, e-scooters, and e-skateboards. Furthermore, the viscous material damping could be used to increase the inherent damping of a whole structure, e.g., in bicycle-frames. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=damper%20structures" title="damper structures">damper structures</a>, <a href="https://publications.waset.org/abstracts/search?q=material%20damping" title=" material damping"> material damping</a>, <a href="https://publications.waset.org/abstracts/search?q=PDMS" title=" PDMS"> PDMS</a>, <a href="https://publications.waset.org/abstracts/search?q=TPU" title=" TPU"> TPU</a> </p> <a href="https://publications.waset.org/abstracts/153969/coil-over-shock-absorbers-compared-to-inherent-material-damping" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/153969.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">114</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">810</span> Vibration Absorption Strategy for Multi-Frequency Excitation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Der%20Chyan%20Lin">Der Chyan Lin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Since the early introduction by Ormondroyd and Den Hartog, vibration absorber (VA) has become one of the most commonly used vibration mitigation strategies. The strategy is most effective for a primary plant subjected to a single frequency excitation. For continuous systems, notable advances in vibration absorption in the multi-frequency system were made. However, the efficacy of the VA strategy for systems under multi-frequency excitation is not well understood. For example, for an N degrees-of-freedom (DOF) primary-absorber system, there are N 'peak' frequencies of large amplitude vibration per every new excitation frequency. In general, the usable range for vibration absorption can be greatly reduced as a result. Frequency modulated harmonic excitation is a commonly seen multi-frequency excitation example: f(t) = cos(ϖ(t)t) where ϖ(t)=ω(1+α sin⁡(δt)). It is known that f(t) has a series expansion given by the Bessel function of the first kind, which implies an infinity of forcing frequencies in the frequency modulated harmonic excitation. For an SDOF system of natural frequency ωₙ subjected to f(t), it can be shown that amplitude peaks emerge at ω₍ₚ,ₖ₎=(ωₙ ± 2kδ)/(α ∓ 1),k∈Z; i.e., there is an infinity of resonant frequencies ω₍ₚ,ₖ₎, k∈Z, making the use of VA strategy ineffective. In this work, we propose an absorber frequency placement strategy for SDOF vibration systems subjected to frequency-modulated excitation. An SDOF linear mass-spring system coupled to lateral absorber systems is used to demonstrate the ideas. Although the mechanical components are linear, the governing equations for the coupled system are nonlinear. We show using N identical absorbers, for N ≫ 1, that (a) there is a cluster of N+1 natural frequencies around every natural absorber frequency, and (b) the absorber frequencies can be moved away from the plant's resonance frequency (ω₀) as N increases. Moreover, we also show the bandwidth of the VA performance increases with N. The derivations of the clustering and bandwidth widening effect will be given, and the superiority of the proposed strategy will be demonstrated via numerical experiments. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bessel%20function" title="Bessel function">Bessel function</a>, <a href="https://publications.waset.org/abstracts/search?q=bandwidth" title=" bandwidth"> bandwidth</a>, <a href="https://publications.waset.org/abstracts/search?q=frequency%20modulated%20excitation" title=" frequency modulated excitation"> frequency modulated excitation</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20absorber" title=" vibration absorber"> vibration absorber</a> </p> <a href="https://publications.waset.org/abstracts/132303/vibration-absorption-strategy-for-multi-frequency-excitation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/132303.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">155</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">809</span> Solutions for Comfort and Safety on Vibrations Resulting from the Action of the Wind on the Building in the Form of Portico with Four Floors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=G.%20B.%20M.%20Carvalho">G. B. M. Carvalho</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20A.%20C.%20Vale"> V. A. C. Vale</a>, <a href="https://publications.waset.org/abstracts/search?q=E.%20T.%20L.%20C%C3%B6uras%20Ford"> E. T. L. Cöuras Ford</a> </p> <p class="card-text"><strong>Abstract:</strong></p> With the aim of increasing the levels of comfort and security structures, the study of dynamic loads on buildings has been one of the focuses in the area of control engineering, civil engineering and architecture. Thus, this work presents a study based on simulation of the dynamics of buildings in the form of portico subjected to wind action, besides presenting an action of passive control, using for this the dynamics of the structure, consequently representing a system appropriated on environmental issues. These control systems are named the dynamic vibration absorbers. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dynamic%20vibration%20absorber" title="dynamic vibration absorber">dynamic vibration absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=structure" title=" structure"> structure</a>, <a href="https://publications.waset.org/abstracts/search?q=comfort" title=" comfort"> comfort</a>, <a href="https://publications.waset.org/abstracts/search?q=safety" title=" safety"> safety</a>, <a href="https://publications.waset.org/abstracts/search?q=wind%20behavior" title=" wind behavior"> wind behavior</a>, <a href="https://publications.waset.org/abstracts/search?q=structure" title=" structure"> structure</a> </p> <a href="https://publications.waset.org/abstracts/74653/solutions-for-comfort-and-safety-on-vibrations-resulting-from-the-action-of-the-wind-on-the-building-in-the-form-of-portico-with-four-floors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/74653.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">407</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">808</span> Reflection Performance of Truncated Pyramidal and Truncated Wedge Microwave Absorber Using Sugarcane Bagasse (SCB) </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Liyana%20Zahid">Liyana Zahid</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohd%20Fareq%20Abd%20Malek"> Mohd Fareq Abd Malek</a>, <a href="https://publications.waset.org/abstracts/search?q=Ee%20Meng%20Cheng"> Ee Meng Cheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Wen%20Liu"> Wei Wen Liu</a>, <a href="https://publications.waset.org/abstracts/search?q=Yeng%20Seng%20Lee"> Yeng Seng Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20Nadeem%20Iqbal"> Muhammad Nadeem Iqbal</a>, <a href="https://publications.waset.org/abstracts/search?q=Fwen%20Hoon%20Wee"> Fwen Hoon Wee</a> </p> <p class="card-text"><strong>Abstract:</strong></p> One of the parameters that affect the performance of microwave absorbers is the shape of the absorbers. This paper shows the performance (reflection loss) of truncated pyramidal and truncated wedge microwave absorbers in the range frequency between 8.2 to 12.4 GHz (X-Band) in simulation. The material used is sugarcane bagasse (SCB) which is one of the new materials that used to fabricate the microwave absorber. The complex permittivity was measured using Agilent dielectric probe technique. The designs were simulated using CST Microwave Studio Software. The reflection losses between these two shapes were compared. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=microwave%20absorber" title="microwave absorber">microwave absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=reflection%20loss" title=" reflection loss"> reflection loss</a>, <a href="https://publications.waset.org/abstracts/search?q=sugarcane%20bagasse%20%28SCB%29" title=" sugarcane bagasse (SCB)"> sugarcane bagasse (SCB)</a>, <a href="https://publications.waset.org/abstracts/search?q=X-Band" title=" X-Band"> X-Band</a> </p> <a href="https://publications.waset.org/abstracts/1457/reflection-performance-of-truncated-pyramidal-and-truncated-wedge-microwave-absorber-using-sugarcane-bagasse-scb" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1457.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">350</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">807</span> Early Installation Effect on the Machines’ Generated Vibration</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Maitham%20Al-Safwani">Maitham Al-Safwani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Motor vibration issues were analyzed by several studies. It is generally accepted that vibration issues result from poor equipment installation. We had a water injection pump tested in the factory and exceeded the pump the vibration limit. Once the pump was brought to the site, its half-size shim plates were replaced with full-size shims plates that drastically reduced the vibration. In this study, vibration data was recorded for several similar motors run at the same and different speeds. The vibration values were recorded -for two and a half hours- and the vibration readings were analyzed to determine when the readings became consistent. This was as well supported by recording the audio noises produced by some machines seeking a relationship between changes in machine noises and machine abnormalities, such as vibration. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=vibration" title="vibration">vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=noise" title=" noise"> noise</a>, <a href="https://publications.waset.org/abstracts/search?q=installation" title=" installation"> installation</a>, <a href="https://publications.waset.org/abstracts/search?q=machine" title=" machine"> machine</a> </p> <a href="https://publications.waset.org/abstracts/149998/early-installation-effect-on-the-machines-generated-vibration" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/149998.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">182</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">806</span> Investigation for the Mechanism of Lateral-Torsional Coupled Vibration of the Propulsion Shaft in a Ship</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hyungsuk%20Han">Hyungsuk Han</a>, <a href="https://publications.waset.org/abstracts/search?q=Soohong%20Jeon"> Soohong Jeon</a>, <a href="https://publications.waset.org/abstracts/search?q=Chungwon%20Lee"> Chungwon Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=YongHoon%20Kim"> YongHoon Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> When a rubber mount and flexible coupling are installed on the main engine, high torsional vibration can occur. The root cause of this high torsional vibration can be attributed to the lateral-torsional coupled vibration of the shaft system. Therefore, the lateral-torsional coupled vibration is investigated numerically after approximating the shaft system to a three-degrees-of-freedom Jeffcott rotor. To verify that the high torsional vibration is caused by the lateral-torsional coupled vibration, a test unit that can simulate this lateral-torsional coupled vibration occurring in the propulsion shaft is developed. Performing a vibration test with the test unit, it can be experimentally verified that the high torsional vibration occurring in the propulsion shaft of the particular ship was caused by the lateral-torsional coupled vibration. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jeffcott%20rotor" title="Jeffcott rotor">Jeffcott rotor</a>, <a href="https://publications.waset.org/abstracts/search?q=lateral-torsional%20coupled%20vibration" title=" lateral-torsional coupled vibration"> lateral-torsional coupled vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=propulsion%20shaft" title=" propulsion shaft"> propulsion shaft</a>, <a href="https://publications.waset.org/abstracts/search?q=stability" title=" stability"> stability</a> </p> <a href="https://publications.waset.org/abstracts/107458/investigation-for-the-mechanism-of-lateral-torsional-coupled-vibration-of-the-propulsion-shaft-in-a-ship" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/107458.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">226</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">805</span> An Ab Initio Study of Delafossite Transparent Conductive Oxides Cu(In, Ga)O2 and Absorbers Films Cu(In, Ga)S2 in Solar-Cell</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mokdad%20Sakhri">Mokdad Sakhri</a>, <a href="https://publications.waset.org/abstracts/search?q=Youcef%20Bouhadda"> Youcef Bouhadda</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Thin film chalcopyrite technology is thus nowadays a solid candidate for photovoltaic cells. The currently used window layer for the solar cell Cu(In,Ga)S2 is our interest point in this work. For this purpose, we have performed a first-principles study of structural, electronic and optical properties for both delafossite transparent conductive oxides Cu (In, Ga)O2 and absorbers films Cu(In,Ga)S2. The calculations have been carried out within the local density functional (LDA) and generalized gradient approximations (GGA) combined with the hubbard potential using norm-conserving pseudopotentials and a plane-wave basis with ABINIT code. We have found the energy gap is :1.6, 2.53, 3.6, 3.8 eV for CuInS2, CuGaS2, CuInO2 and CuGaO2 respectively. The results are in good agreement with experimental results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ABINIT%20code" title="ABINIT code">ABINIT code</a>, <a href="https://publications.waset.org/abstracts/search?q=DFT" title=" DFT"> DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=electronic%20and%20optical%20properties" title=" electronic and optical properties"> electronic and optical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=solar-cell%20absorbers" title=" solar-cell absorbers"> solar-cell absorbers</a>, <a href="https://publications.waset.org/abstracts/search?q=delafossite%20transparent%20conductive%20oxides" title=" delafossite transparent conductive oxides"> delafossite transparent conductive oxides</a> </p> <a href="https://publications.waset.org/abstracts/18909/an-ab-initio-study-of-delafossite-transparent-conductive-oxides-cuin-gao2-and-absorbers-films-cuin-gas2-in-solar-cell" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/18909.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">568</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">804</span> Experimental Study on the Floor Vibration Evaluation of Concrete Slab for Existing Buildings</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yong-Taeg%20Lee">Yong-Taeg Lee</a>, <a href="https://publications.waset.org/abstracts/search?q=Jun-Ho%20Na"> Jun-Ho Na</a>, <a href="https://publications.waset.org/abstracts/search?q=Seung-Hun%20Kim"> Seung-Hun Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Seong-Uk%20Hong"> Seong-Uk Hong</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Damages from noise and vibration are increasing every year, most of which are noises between floors in deteriorated building caused by floor impact sound. In this study, the concrete slab measured vibration impact sound for evaluation floor vibration of deteriorated buildings that fails to satisfy with the minimum thickness. In this experimental study, the vibration scale by impact sound was calibrated and compared with ISO and AIJ standard for vibration. The results show that vibration in slab with thickness used in existing building reach human perception levels. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=vibration" title="vibration">vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=frequency" title=" frequency"> frequency</a>, <a href="https://publications.waset.org/abstracts/search?q=accelerometer" title=" accelerometer"> accelerometer</a>, <a href="https://publications.waset.org/abstracts/search?q=concrete%20slab" title=" concrete slab "> concrete slab </a> </p> <a href="https://publications.waset.org/abstracts/9440/experimental-study-on-the-floor-vibration-evaluation-of-concrete-slab-for-existing-buildings" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/9440.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">642</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">803</span> The Effects of Spatial Dimensions and Relocation and Dimensions of Sound Absorbers in a Space on the Objective Parameters of Sound</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mustafa%20Kavraz">Mustafa Kavraz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study investigated the differences in the objective parameters of sound depending on the changes in the lengths of the lateral surfaces of a space and on the replacement of the sound absorbers that are placed on these surfaces. To this end, three models of room were chosen. The widths and heights of these rooms were the same but the lengths of the rooms were changed. The smallest room was 8 m. wide and 10 m. long. The lengths of the other two rooms were 15 m. and 20 m. For each model, the differences in the objective parameters of sound were determined by keeping all the material in the space intact and by changing only the positions of the sound absorbers that were placed on the walls. The sound absorbers that were used on the walls were of two different sizes. The sound absorbers that were placed on the walls were 4 m and 8 m. long and story-height (3 m.). In all model room types, the sound absorbers were placed on the long walls in three different ways: at the end of the long walls where the long walls meet the front wall; at the end of the long walls where the long walls meet the back wall; and in the middle part of the long walls. Except for the specially placed sound absorbers, the ground, wall and ceiling surfaces were covered with three different materials. There were no constructional elements such as doors and windows on the walls. On the surfaces, the materials specified in the Odeon 10 material library were used as coating material. Linoleum was used as flooring material, painted plaster as wall coating material and gypsum boards as ceiling covering (2 layers with a total of 32 mm. thickness). These were preferred due to the fact that they are the commonly used materials for these purposes. This study investigated the differences in the objective parameters of sound depending on the changes in the lengths of the lateral surfaces of a space and on the replacement of the sound absorbers that are placed on these surfaces. To this end, three models of room were chosen. The widths and heights of these rooms were the same but the lengths of the rooms were changed. The smallest room was 8 m. wide and 10 m. long. The lengths of the other two rooms were 15 m. and 20 m. For each model, the differences in the objective parameters of sound were determined by keeping all the material in the space intact and by changing only the positions of the sound absorbers that were placed on the walls. The sound absorbers that were used on the walls were of two different sizes. The sound absorbers that were placed on the walls were 4 m and 8 m. long and story-height (3 m.). In all model room types, the sound absorbers were placed on the long walls in three different ways: at the end of the long walls where the long walls meet the front wall; at the end of the long walls where the long walls meet the back wall; and in the middle part of the long walls. Except for the specially placed sound absorbers, the ground, wall and ceiling surfaces were covered with three different materials. There were no constructional elements such as doors and windows on the walls. On the surfaces, the materials specified in the Odeon 10 material library were used as coating material. Linoleum was used as flooring material, painted plaster as wall coating material and gypsum boards as ceiling covering (2 layers with a total of 32 mm. thickness). These were preferred due to the fact that they are the commonly used materials for these purposes. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=sound%20absorber" title="sound absorber">sound absorber</a>, <a href="https://publications.waset.org/abstracts/search?q=room%20model" title=" room model"> room model</a>, <a href="https://publications.waset.org/abstracts/search?q=objective%20parameters%20of%20sound" title=" objective parameters of sound"> objective parameters of sound</a>, <a href="https://publications.waset.org/abstracts/search?q=jnd" title=" jnd"> jnd</a> </p> <a href="https://publications.waset.org/abstracts/35097/the-effects-of-spatial-dimensions-and-relocation-and-dimensions-of-sound-absorbers-in-a-space-on-the-objective-parameters-of-sound" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35097.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">374</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">802</span> An Analytical Study on the Vibration Reduction Method of Railway Station Using TPU</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jinho%20Hur">Jinho Hur</a>, <a href="https://publications.waset.org/abstracts/search?q=Minjung%20Shin"> Minjung Shin</a>, <a href="https://publications.waset.org/abstracts/search?q=Heekyu%20Kim"> Heekyu Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In many places, new railway constructions in the city are being used to build a viaduct station to take advantage of the space below the line, for difficulty of securing railway site and disconnections of areas. The space under the viaduct has limited to use by noise and vibration. In order to use it for various purposes, reducing noise and vibration is required. The vibration reduction method for new structures is recently developed enough to use as accommodation, but the reduction method for existing structures is still far-off. In this study, it suggests vibration reduction method by filling vibration reduction material to column members which is path of structure-bone-noise from trains run. Because most of railroad stations are reinforced concrete structures. It compares vibration reduction of station applied the method and original station by FEM analysis. As a result, reduction of vibration acceleration level in bandwidth 15~30Hz can be reduced. Therefore, using this method for viaduct railroad station, vibration of station is expected to be reduced. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=structure%20borne%20noise" title="structure borne noise">structure borne noise</a>, <a href="https://publications.waset.org/abstracts/search?q=TPU" title=" TPU"> TPU</a>, <a href="https://publications.waset.org/abstracts/search?q=viaduct%20rail%20station" title=" viaduct rail station"> viaduct rail station</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20reduction%20method" title=" vibration reduction method"> vibration reduction method</a> </p> <a href="https://publications.waset.org/abstracts/24122/an-analytical-study-on-the-vibration-reduction-method-of-railway-station-using-tpu" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/24122.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">542</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">801</span> Development of a Human Vibration Model Considering Muscles and Stiffness of Intervertebral Discs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Young%20Nam%20Jo">Young Nam Jo</a>, <a href="https://publications.waset.org/abstracts/search?q=Moon%20Jeong%20Kang"> Moon Jeong Kang</a>, <a href="https://publications.waset.org/abstracts/search?q=Hong%20Hee%20Yoo"> Hong Hee Yoo</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Most human vibration models have been modeled as a multibody system consisting of some rigid bodies and spring-dampers. These models are developed for certain posture and conditions. So, the models cannot be used in vibration analysis in various posture and conditions. The purpose of this study is to develop a human vibration model that represent human vibration characteristics under various conditions by employing a musculoskeletal model. To do this, the human vibration model is developed based on biomechanical models. In addition, muscle models are employed instead of spring-dampers. Activations of muscles are controlled by PD controller to maintain body posture under vertical vibration is applied. Each gain value of the controller is obtained to minimize the difference of apparent mass and acceleration transmissibility between experim ent and analysis by using an optimization method. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=human%20vibration%20analysis" title="human vibration analysis">human vibration analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=hill%20type%20muscle%20model" title=" hill type muscle model"> hill type muscle model</a>, <a href="https://publications.waset.org/abstracts/search?q=PD%20control" title=" PD control"> PD control</a>, <a href="https://publications.waset.org/abstracts/search?q=whole-body%20vibration" title=" whole-body vibration"> whole-body vibration</a> </p> <a href="https://publications.waset.org/abstracts/34177/development-of-a-human-vibration-model-considering-muscles-and-stiffness-of-intervertebral-discs" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/34177.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">448</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">800</span> Tuned Mass Damper Vibration Control of Pedestrian Bridge</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Qinglin%20Shu">Qinglin Shu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Based on the analysis of the structural vibration comfort of a domestic bridge, this paper studies the vibration reduction control principle of TMD, the derivation process of design parameter optimization and how to simulate TMD in the finite element software ANSYS. The research shows that, in view of the problem that the comfort level of a bridge exceeds the limit in individual working conditions, the vibration reduction control design of the bridge can effectively reduce the vibration of the structure by using TMD. Calculations show that when the mass ratio of TMD is 0.01, the vibration reduction rate under different working conditions is more than 90%, and the dynamic displacement of the TMD mass block is within 0.01m, indicating that the design of TMD is reasonable and safe. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=pedestrian%20bridges" title="pedestrian bridges">pedestrian bridges</a>, <a href="https://publications.waset.org/abstracts/search?q=human-induced%20vibration" title=" human-induced vibration"> human-induced vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=comfort" title=" comfort"> comfort</a>, <a href="https://publications.waset.org/abstracts/search?q=tuned%20mass%20dampers" title=" tuned mass dampers"> tuned mass dampers</a> </p> <a href="https://publications.waset.org/abstracts/152738/tuned-mass-damper-vibration-control-of-pedestrian-bridge" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/152738.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">114</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">799</span> Experimental Study on the Vibration Isolation Performance of Metal-Net Rubber Vibration Absorber</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Su%20Yi%20Ming">Su Yi Ming</a>, <a href="https://publications.waset.org/abstracts/search?q=Hou%20Ying"> Hou Ying</a>, <a href="https://publications.waset.org/abstracts/search?q=Zou%20Guang%20Ping"> Zou Guang Ping</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Metal-net rubber is a new dry friction damping material, compared with the traditional metal rubber, which has high mechanization degree, and the mechanical performance of metal-net rubber is more stable. Through the sine sweep experiment and random vibration experiment of metal-net rubber vibration isolator, the influence of several important factors such as the lines slope, relative density and wire diameter on the transfer rate, natural frequency and root-mean-square response acceleration of metal-net rubber vibration isolation system, were studied through the method of control variables. Also, several relevant change curves under different vibration levels were derived, and the effects of vibration level on the natural frequency and root-mean-square response acceleration were analyzed through the curves. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=metal-net%20rubber%20vibration%20isolator" title="metal-net rubber vibration isolator">metal-net rubber vibration isolator</a>, <a href="https://publications.waset.org/abstracts/search?q=relative%20density" title=" relative density"> relative density</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20level" title=" vibration level"> vibration level</a>, <a href="https://publications.waset.org/abstracts/search?q=wire%20diameter" title=" wire diameter"> wire diameter</a> </p> <a href="https://publications.waset.org/abstracts/52749/experimental-study-on-the-vibration-isolation-performance-of-metal-net-rubber-vibration-absorber" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52749.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">396</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">798</span> Computer Simulation Studies of Aircraft Wing Architectures on Vibration Responses</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shengyong%20Zhang">Shengyong Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Mike%20Mikulich"> Mike Mikulich</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vibration is a crucial limiting consideration in the analysis and design of airplane wing structures to avoid disastrous failures due to the propagation of existing cracks in the material. In this paper, we build CAD models of aircraft wings to capture the design intent with configurations. Subsequent FEA vibration analysis is performed to study the natural vibration properties and impulsive responses of the resulting user-defined wing models. This study reveals the variations of the wing’s vibration characteristics with respect to changes in its structural configurations. Integrating CAD modelling and FEA vibration analysis enables designers to improve wing architectures for implementing design requirements in the preliminary design stage. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aircraft%20wing" title="aircraft wing">aircraft wing</a>, <a href="https://publications.waset.org/abstracts/search?q=CAD%20modelling" title=" CAD modelling"> CAD modelling</a>, <a href="https://publications.waset.org/abstracts/search?q=FEA" title=" FEA"> FEA</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20analysis" title=" vibration analysis"> vibration analysis</a> </p> <a href="https://publications.waset.org/abstracts/139170/computer-simulation-studies-of-aircraft-wing-architectures-on-vibration-responses" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/139170.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">165</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">797</span> Research on the Torsional Vibration of a Power-Split Hybrid Powertrain Equipped with a Dual Mass Flywheel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Xiaolin%20Tang">Xiaolin Tang</a>, <a href="https://publications.waset.org/abstracts/search?q=Wei%20Yang"> Wei Yang</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiaoan%20Chen"> Xiaoan Chen</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The research described in this paper was aimed at exploring the torsional vibration characteristics of a power-split hybrid powertrain equipped with a dual mass flywheel. The dynamic equations of governing torsional vibration for this hybrid driveline are presented, and the multi-body dynamic model for the powertrain is established with the software of ADAMS. Accordingly, different parameters of dual mass flywheel are investigated by forced vibration to reduce the torsional vibration of hybrid drive train. The analysis shows that the implementation of a dual mass flywheel is an effective way to decrease the torsional vibration of the hybrid powertrain. At last, the optimal combination of parameters yielding the lowest vibration is provided. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=dual%20mass%20flywheel" title="dual mass flywheel">dual mass flywheel</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20electric%20vehicle" title=" hybrid electric vehicle"> hybrid electric vehicle</a>, <a href="https://publications.waset.org/abstracts/search?q=torsional%20vibration" title=" torsional vibration"> torsional vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=powertrain" title=" powertrain"> powertrain</a>, <a href="https://publications.waset.org/abstracts/search?q=dynamics" title=" dynamics"> dynamics</a> </p> <a href="https://publications.waset.org/abstracts/47396/research-on-the-torsional-vibration-of-a-power-split-hybrid-powertrain-equipped-with-a-dual-mass-flywheel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/47396.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">409</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">796</span> Influence of Vibration Amplitude on Reaction Time and Drowsiness Level </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohd%20A.%20Azizan">Mohd A. Azizan</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohd%20Z.%20Zali"> Mohd Z. Zali</a> </p> <p class="card-text"><strong>Abstract:</strong></p> It is well established that exposure to vibration has an adverse effect on human health, comfort, and performance. However, there is little quantitative knowledge on performance combined with drowsiness level during vibration exposure. This paper reports a study investigating the influence of vibration amplitude on seated occupant reaction time and drowsiness level. Eighteen male volunteers were recruited for this experiment. Before commencing the experiment, total transmitted acceleration measured at interfaces between the seat pan and seatback to human body was adjusted to become 0.2 ms-2 r.m.s and 0.4 ms-2 r.m.s for each volunteer. Seated volunteers were exposed to Gaussian random vibration with frequency band 1-15 Hz at two level of amplitude (low vibration amplitude and medium vibration amplitude) for 20-minutes in separate days. For the purpose of drowsiness measurement, volunteers were asked to complete 10-minutes PVT test before and after vibration exposure and rate their subjective drowsiness by giving score using Karolinska Sleepiness Scale (KSS) before vibration, every 5-minutes interval and following 20-minutes of vibration exposure. Strong evidence of drowsiness was found as there was a significant increase in reaction time and number of lapse following exposure to vibration in both conditions. However, the effect is more apparent in medium vibration amplitude. A steady increase of drowsiness level can also be observed in KSS in all volunteers. However, no significant differences were found in KSS between low vibration amplitude and medium vibration amplitude. It is concluded that exposure to vibration has an adverse effect on human alertness level and more pronounced at higher vibration amplitude. Taken together, these findings suggest a role of vibration in promoting drowsiness, especially at higher vibration amplitude. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=drowsiness" title="drowsiness">drowsiness</a>, <a href="https://publications.waset.org/abstracts/search?q=human%20vibration" title=" human vibration"> human vibration</a>, <a href="https://publications.waset.org/abstracts/search?q=karolinska%20sleepiness%20scale" title=" karolinska sleepiness scale"> karolinska sleepiness scale</a>, <a href="https://publications.waset.org/abstracts/search?q=psychomotor%20vigilance%20test" title=" psychomotor vigilance test"> psychomotor vigilance test</a> </p> <a href="https://publications.waset.org/abstracts/66811/influence-of-vibration-amplitude-on-reaction-time-and-drowsiness-level" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/66811.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">282</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">795</span> Piezoelectric based Passive Vibration Control of Composite Turbine Blade using Shunt Circuit</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Kouider%20Bendine">Kouider Bendine</a>, <a href="https://publications.waset.org/abstracts/search?q=Zouaoui%20Satla"> Zouaoui Satla</a>, <a href="https://publications.waset.org/abstracts/search?q=Boukhoulda%20Farouk%20Benallel"> Boukhoulda Farouk Benallel</a>, <a href="https://publications.waset.org/abstracts/search?q=Shun-Qi%20Zhang"> Shun-Qi Zhang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Turbine blades are subjected to a variety of loads, lead to an undesirable vibration. Such vibration can cause serious damages or even lead to a total failure of the blade. The present paper addresses the vibration control of turbine blade. The study aims to propose a passive vibration control using piezoelectric material. the passive control is effectuated by shunting an RL circuit to the piezoelectric patch in a parallel configuration. To this end, a Finite element model for the blade with the piezoelectric patch is implemented in ANSYS APDL. The model is then subjected to a harmonic frequency-based analysis for the case of control on and off. The results show that the proposed methodology was able to reduce blade vibration by 18%. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=blade" title="blade">blade</a>, <a href="https://publications.waset.org/abstracts/search?q=active%20piezoelectric%20vibration%20control" title=" active piezoelectric vibration control"> active piezoelectric vibration control</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element." title=" finite element."> finite element.</a>, <a href="https://publications.waset.org/abstracts/search?q=shunt%20circuit" title=" shunt circuit"> shunt circuit</a> </p> <a href="https://publications.waset.org/abstracts/165603/piezoelectric-based-passive-vibration-control-of-composite-turbine-blade-using-shunt-circuit" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/165603.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">101</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">794</span> The Effect of Degraded Shock Absorbers on the Safety-Critical Tipping and Rolling Behaviour of Passenger Cars</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Tobias%20Schramm">Tobias Schramm</a>, <a href="https://publications.waset.org/abstracts/search?q=G%C3%BCnther%20Prokop"> Günther Prokop</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In Germany, the number of road fatalities has been falling since 2010 at a more moderate rate than before. At the same time, the average age of all registered passenger cars in Germany is rising continuously. Studies show that there is a correlation between the age and mileage of passenger cars and the degradation of their chassis components. Various studies show that degraded shock absorbers increase the braking distance of passenger cars and have a negative impact on driving stability. The exact effect of degraded vehicle shock absorbers on road safety is still the subject of research. A shock absorber examination as part of the periodic technical inspection is only mandatory in very few countries. In Germany, there is as yet no requirement for such a shock absorber examination. More comprehensive findings on the effect of degraded shock absorbers on the safety-critical driving dynamics of passenger cars can provide further arguments for the introduction of mandatory shock absorber testing as part of the periodic technical inspection. The specific effect chains of untripped rollover accidents are also still the subject of research. However, current research results show that the high proportion of sport utility vehicles in the vehicle field significantly increases the probability of untripped rollover accidents. The aim of this work is to estimate the effect of degraded twin-tube shock absorbers on the safety-critical tipping and rolling behaviour of passenger cars, which can lead to untripped rollover accidents. A characteristic curve-based five-mass full vehicle model and a semi-physical phenomenological shock absorber model were set up, parameterized and validated. The shock absorber model is able to reproduce the damping characteristics of vehicle twin-tube shock absorbers with oil and gas loss for various excitations. The full vehicle model was validated with steering wheel angle sinus sweep driving maneuvers. The model was then used to simulate steering wheel angle sine and fishhook maneuvers, which investigate the safety-critical tipping and rolling behavior of passenger cars. The simulations were carried out in a realistic parameter space in order to demonstrate the effect of various vehicle characteristics on the effect of degraded shock absorbers. As a result, it was shown that degraded shock absorbers have a negative effect on the tipping and rolling behavior of all passenger cars. Shock absorber degradation leads to a significant increase in the observed roll angles, particularly in the range of the roll natural frequency. This superelevation has a negative effect on the wheel load distribution during the driving maneuvers investigated. In particular, the height of the vehicle's center of gravity and the stabilizer stiffness of the vehicles has a major influence on the effect of degraded shock absorbers on the overturning and rolling behaviour of passenger cars. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=numerical%20simulation" title="numerical simulation">numerical simulation</a>, <a href="https://publications.waset.org/abstracts/search?q=safety-critical%20driving%20dynamics" title=" safety-critical driving dynamics"> safety-critical driving dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=suspension%20degradation" title=" suspension degradation"> suspension degradation</a>, <a href="https://publications.waset.org/abstracts/search?q=tipping%20and%20rolling%20behavior%20of%20passenger%20cars" title=" tipping and rolling behavior of passenger cars"> tipping and rolling behavior of passenger cars</a>, <a href="https://publications.waset.org/abstracts/search?q=vehicle%20shock%20absorber" title=" vehicle shock absorber"> vehicle shock absorber</a> </p> <a href="https://publications.waset.org/abstracts/194629/the-effect-of-degraded-shock-absorbers-on-the-safety-critical-tipping-and-rolling-behaviour-of-passenger-cars" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/194629.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">9</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">793</span> Fuzzy Sliding Mode Control of a Flexible Structure for Vibration Suppression Using MFC Actuator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jinsiang%20Shaw">Jinsiang Shaw</a>, <a href="https://publications.waset.org/abstracts/search?q=Shih-Chieh%20Tseng"> Shih-Chieh Tseng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Active vibration control is good for low frequency excitation, with advantages of light weight and adaptability. This paper use a macro-fiber composite (MFC) actuator for vibration suppression in a cantilevered beam due to its higher output force to suppress the disturbance. A fuzzy sliding mode controller is developed and applied to this system. Experimental results illustrate that the controller and MFC actuator are very effective in attenuating the structural vibration near the first resonant freuqency. Furthermore, this controller is shown to outperform the traditional skyhook controller, with nearly 90% of the vibration suppressed at the first resonant frequency of the structure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fuzzy%20sliding%20mode%20controller" title="Fuzzy sliding mode controller">Fuzzy sliding mode controller</a>, <a href="https://publications.waset.org/abstracts/search?q=macro-fiber-composite%20actuator" title=" macro-fiber-composite actuator"> macro-fiber-composite actuator</a>, <a href="https://publications.waset.org/abstracts/search?q=skyhook%20controller" title=" skyhook controller"> skyhook controller</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20suppression" title=" vibration suppression"> vibration suppression</a> </p> <a href="https://publications.waset.org/abstracts/25138/fuzzy-sliding-mode-control-of-a-flexible-structure-for-vibration-suppression-using-mfc-actuator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/25138.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">403</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">792</span> Vibration Control of a Flexible Structure Using MFC Actuator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jinsiang%20Shaw">Jinsiang Shaw</a>, <a href="https://publications.waset.org/abstracts/search?q=Jeng-Jie%20Huang"> Jeng-Jie Huang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Active vibration control is good for low frequency excitation, with advantages of light weight and adaptability. This paper employs a macro-fiber composite (MFC) actuator for vibration suppression in a cantilevered beam due to its higher output force to reject the disturbance. A notch filter with an adaptive tuning algorithm, the leaky filtered-X least mean square algorithm (leaky FXLMS algorithm), is developed and applied to the system. Experimental results show that the controller and MFC actuator was very effective in attenuating the structural vibration. Furthermore, this notch filter controller was compared with the traditional skyhook controller. It was found that its performance was better, with over 88% vibration suppression near the first resonant frequency of the structure. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=macro-fiber%20composite" title="macro-fiber composite">macro-fiber composite</a>, <a href="https://publications.waset.org/abstracts/search?q=notch%20filter" title=" notch filter"> notch filter</a>, <a href="https://publications.waset.org/abstracts/search?q=skyhook%20controller" title=" skyhook controller"> skyhook controller</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20suppression" title=" vibration suppression"> vibration suppression</a> </p> <a href="https://publications.waset.org/abstracts/7710/vibration-control-of-a-flexible-structure-using-mfc-actuator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/7710.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">462</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">791</span> Effects of Long Term Whole Body Vibration Training on Lipid Profile of Young Men </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Farshad%20Ghazalian">Farshad Ghazalian</a>, <a href="https://publications.waset.org/abstracts/search?q=Laleh%20Hakemi"> Laleh Hakemi</a>, <a href="https://publications.waset.org/abstracts/search?q=Lotfali%20Pourkazemi"> Lotfali Pourkazemi</a>, <a href="https://publications.waset.org/abstracts/search?q=Maryam%20Ameri"> Maryam Ameri</a>, <a href="https://publications.waset.org/abstracts/search?q=Seyed%20Hossein%20Alavi"> Seyed Hossein Alavi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Background: The use of whole body vibration (WBV) as an exercise method has rapidly increased over the last decade. The aim of this study was to evaluate long term effects of different amplitudes of whole body vibration training with progressive frequencies on lipid profile of young healthy men. Materials and methods: Thirty three healthy male students were divided randomly in three groups: high amplitude vibration group (n=11), low amplitude vibration group (n=11), and control group (n=11). The vibration training consisted of 5 week whole-body vibration 3 times a week with amplitudes 4 and 2 mm and progressive frequencies from 25 Hz with increments of 5 Hz weekly. Concentrations TG, HDL, LDL, cholesterol, and VLDL before and after 5 weeks of training were measured in plasma samples. Statistical analysis was done using one way analysis of variance. P<0.05 was considered statistically significant. Results: The most important result of the present study is finding no favorable changes of 5-week vibration training with different amplitudes on blood lipid profiles. Discussion and conclusions: It was emphasized that in vibration training there should be a relationship between intensity and volume of exercise and lipid responses in order to improve blood lipoprotein profiles. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=long%20term" title="long term">long term</a>, <a href="https://publications.waset.org/abstracts/search?q=body" title=" body"> body</a>, <a href="https://publications.waset.org/abstracts/search?q=vibration%20training" title=" vibration training"> vibration training</a>, <a href="https://publications.waset.org/abstracts/search?q=lipid" title=" lipid "> lipid </a> </p> <a href="https://publications.waset.org/abstracts/8026/effects-of-long-term-whole-body-vibration-training-on-lipid-profile-of-young-men" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/8026.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">419</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">790</span> Engineering Optimization of Flexible Energy Absorbers</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Reza%20Hedayati">Reza Hedayati</a>, <a href="https://publications.waset.org/abstracts/search?q=Meysam%20Jahanbakhshi"> Meysam Jahanbakhshi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Elastic energy absorbers which consist of a ring-liked plate and springs can be a good choice for increasing the impact duration during an accident. In the current project, an energy absorber system is optimized using four optimizing methods Kuhn-Tucker, Sequential Linear Programming (SLP), Concurrent Subspace Design (CSD), and Pshenichny-Lim-Belegundu-Arora (PLBA). Time solution, convergence, Programming Length and accuracy of the results were considered to find the best solution algorithm. Results showed the superiority of PLBA over the other algorithms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Concurrent%20Subspace%20Design%20%28CSD%29" title="Concurrent Subspace Design (CSD)">Concurrent Subspace Design (CSD)</a>, <a href="https://publications.waset.org/abstracts/search?q=Kuhn-Tucker" title=" Kuhn-Tucker"> Kuhn-Tucker</a>, <a href="https://publications.waset.org/abstracts/search?q=Pshenichny-Lim-Belegundu-Arora%20%28PLBA%29" title=" Pshenichny-Lim-Belegundu-Arora (PLBA)"> Pshenichny-Lim-Belegundu-Arora (PLBA)</a>, <a href="https://publications.waset.org/abstracts/search?q=Sequential%20Linear%20Programming%20%28SLP%29" title=" Sequential Linear Programming (SLP)"> Sequential Linear Programming (SLP)</a> </p> <a href="https://publications.waset.org/abstracts/23842/engineering-optimization-of-flexible-energy-absorbers" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23842.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">399</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=vibration%20absorbers&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=vibration%20absorbers&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=vibration%20absorbers&page=4">4</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=vibration%20absorbers&page=5">5</a></li> <li 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