{"title":"Dynamic Simulation of IC Engine Bearings for Fault Detection and Wear Prediction","authors":"M. D. Haneef, R. B. Randall, Z. Peng","volume":107,"journal":"International Journal of Mechanical and Mechatronics Engineering","pagesStart":1993,"pagesEnd":2003,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10003253","abstract":"Journal bearings used in IC engines are prone to premature\r\nfailures and are likely to fail earlier than the rated life due to\r\nhighly impulsive and unstable operating conditions and frequent\r\nstarts\/stops. Vibration signature extraction and wear debris analysis\r\ntechniques are prevalent in industry for condition monitoring of\r\nrotary machinery. However, both techniques involve a great deal of\r\ntechnical expertise, time, and cost. Limited literature is available on\r\nthe application of these techniques for fault detection in reciprocating\r\nmachinery, due to the complex nature of impact forces that\r\nconfounds the extraction of fault signals for vibration-based analysis\r\nand wear prediction. In present study, a simulation model was developed to investigate\r\nthe bearing wear behaviour, resulting because of different operating\r\nconditions, to complement the vibration analysis. In current\r\nsimulation, the dynamics of the engine was established first, based on\r\nwhich the hydrodynamic journal bearing forces were evaluated by\r\nnumerical solution of the Reynold\u2019s equation. In addition, the\r\nessential outputs of interest in this study, critical to determine wear\r\nrates are the tangential velocity and oil film thickness between the\r\njournals and bearing sleeve, which if not maintained appropriately,\r\nhave a detrimental effect on the bearing performance. Archard\u2019s wear prediction model was used in the simulation to\r\ncalculate the wear rate of bearings with specific location information\r\nas all determinative parameters were obtained with reference to crank\r\nrotation. Oil film thickness obtained from the model was used as a\r\ncriterion to determine if the lubrication is sufficient to prevent contact\r\nbetween the journal and bearing thus causing accelerated wear. A\r\nlimiting value of 1 \u03bcm was used as the minimum oil film thickness\r\nneeded to prevent contact. The increased wear rate with growing\r\nseverity of operating conditions is analogous and comparable to the\r\nrise in amplitude of the squared envelope of the referenced vibration\r\nsignals. Thus on one hand, the developed model demonstrated its\r\ncapability to explain wear behaviour and on the other hand it also\r\nhelps to establish a co-relation between wear based and vibration\r\nbased analysis. 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