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ホドグラフ - Wikipedia
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cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-21" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">21の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B1%D8%A7%D8%B3%D9%85_%D8%A7%D9%84%D8%AE%D8%B7%D8%A7" title="アラビア語: راسم الخطا" lang="ar" hreflang="ar" data-title="راسم الخطا" data-language-autonym="العربية" data-language-local-name="アラビア語" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Hod%C3%B2grafa" title="カタロニア語: Hodògrafa" lang="ca" hreflang="ca" data-title="Hodògrafa" data-language-autonym="Català" data-language-local-name="カタロニア語" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Hodograph" title="ドイツ語: Hodograph" lang="de" hreflang="de" data-title="Hodograph" data-language-autonym="Deutsch" data-language-local-name="ドイツ語" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Hodograph" title="英語: Hodograph" lang="en" hreflang="en" data-title="Hodograph" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Hod%C3%B3grafa" title="スペイン語: Hodógrafa" lang="es" hreflang="es" data-title="Hodógrafa" data-language-autonym="Español" data-language-local-name="スペイン語" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Hodograaf" title="エストニア語: Hodograaf" lang="et" hreflang="et" data-title="Hodograaf" data-language-autonym="Eesti" data-language-local-name="エストニア語" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Hodographe" title="フランス語: Hodographe" lang="fr" hreflang="fr" data-title="Hodographe" data-language-autonym="Français" data-language-local-name="フランス語" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%B8%D5%A4%D5%B8%D5%A3%D6%80%D5%A1%D6%86" title="アルメニア語: Հոդոգրաֆ" lang="hy" hreflang="hy" data-title="Հոդոգրաֆ" data-language-autonym="Հայերեն" data-language-local-name="アルメニア語" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Hodografo" title="イド語: Hodografo" lang="io" hreflang="io" data-title="Hodografo" data-language-autonym="Ido" data-language-local-name="イド語" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%93%D0%BE%D0%B4%D0%BE%D0%B3%D1%80%D0%B0%D1%84" title="カザフ語: Годограф" lang="kk" hreflang="kk" data-title="Годограф" data-language-autonym="Қазақша" data-language-local-name="カザフ語" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ky mw-list-item"><a href="https://ky.wikipedia.org/wiki/%D0%93%D0%BE%D0%B4%D0%BE%D0%B3%D1%80%D0%B0%D1%84" title="キルギス語: Годограф" lang="ky" hreflang="ky" data-title="Годограф" data-language-autonym="Кыргызча" data-language-local-name="キルギス語" class="interlanguage-link-target"><span>Кыргызча</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Od%C3%B2grafo" title="ロンバルド語: Odògrafo" lang="lmo" hreflang="lmo" data-title="Odògrafo" data-language-autonym="Lombard" data-language-local-name="ロンバルド語" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Hodograf" title="ノルウェー語(ニーノシュク): Hodograf" lang="nn" hreflang="nn" data-title="Hodograf" data-language-autonym="Norsk nynorsk" data-language-local-name="ノルウェー語(ニーノシュク)" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Hodograf" title="ポーランド語: Hodograf" lang="pl" hreflang="pl" data-title="Hodograf" data-language-autonym="Polski" data-language-local-name="ポーランド語" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Hod%C3%B3grafo" title="ポルトガル語: Hodógrafo" lang="pt" hreflang="pt" data-title="Hodógrafo" data-language-autonym="Português" data-language-local-name="ポルトガル語" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%93%D0%BE%D0%B4%D0%BE%D0%B3%D1%80%D0%B0%D1%84" title="ロシア語: Годограф" lang="ru" hreflang="ru" data-title="Годограф" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Hodograf" title="スロベニア語: Hodograf" lang="sl" hreflang="sl" data-title="Hodograf" data-language-autonym="Slovenščina" data-language-local-name="スロベニア語" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Hodograf" title="スウェーデン語: Hodograf" lang="sv" hreflang="sv" data-title="Hodograf" data-language-autonym="Svenska" data-language-local-name="スウェーデン語" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%93%D0%BE%D0%B4%D0%BE%D0%B3%D1%80%D0%B0%D1%84" title="ウクライナ語: Годограф" lang="uk" hreflang="uk" data-title="Годограф" data-language-autonym="Українська" data-language-local-name="ウクライナ語" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Godograf(Hodograph)" title="ウズベク語: Godograf(Hodograph)" lang="uz" hreflang="uz" data-title="Godograf(Hodograph)" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="ウズベク語" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E9%80%9F%E7%AB%AF%E6%9B%B2%E7%B7%9A" title="中国語: 速端曲線" lang="zh" hreflang="zh" data-title="速端曲線" data-language-autonym="中文" data-language-local-name="中国語" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q1546281#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95" title="本文を閲覧 [c]" accesskey="c"><span>ページ</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%8E%E3%83%BC%E3%83%88:%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95&action=edit&redlink=1" rel="discussion" class="new" title="「本文ページについての議論」 (存在しないページ) [t]" accesskey="t"><span>ノート</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="別の言語に切り替える" > <label id="vector-variants-dropdown-label" for="vector-variants-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button 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class="vector-page-tools-landmark" aria-label="ページツール"> <div id="vector-page-tools-pinned-container" class="vector-pinned-container"> </div> </nav> <nav class="vector-appearance-landmark" aria-label="表示"> <div id="vector-appearance-pinned-container" class="vector-pinned-container"> <div id="vector-appearance" class="vector-appearance vector-pinnable-element"> <div class="vector-pinnable-header vector-appearance-pinnable-header vector-pinnable-header-pinned" data-feature-name="appearance-pinned" data-pinnable-element-id="vector-appearance" data-pinned-container-id="vector-appearance-pinned-container" data-unpinned-container-id="vector-appearance-unpinned-container" > <div class="vector-pinnable-header-label">表示</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-appearance.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-appearance.unpin">非表示</button> </div> </div> </div> </nav> </div> </div> <div id="bodyContent" class="vector-body" aria-labelledby="firstHeading" data-mw-ve-target-container> <div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">出典: フリー百科事典『ウィキペディア(Wikipedia)』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><p><b>ホドグラフ</b>(Hodograph)とは、空間(座標<i><b>r</b></i> )上を点が速度 <i><b>v</b></i> = <i><b>v</b></i> (<i><b>r</b></i> ) で運動しているとき、位置を速度の関数とみなしたときの速度空間上での曲線 <i><b>r</b></i> = <i><b>r</b></i> (<i><b>v</b></i> ) のことである<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>。この変換を<b>ホドグラフ変換</b>という。 </p><p>この変換により得られる <i><b>r</b></i> (<i><b>v</b></i> ) が満たす方程式(<b>ホドグラフ方程式</b>)が簡単に解け、かつ逆変換が可能なら、もとの解 <i><b>v</b></i> (<i><b>r</b></i> ) が求められることになる。 </p><p><a href="/wiki/%E6%B5%81%E4%BD%93%E5%8A%9B%E5%AD%A6" title="流体力学">流体力学</a>などで複雑な流れを解析するのに応用されている。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="数学的定義"><span id=".E6.95.B0.E5.AD.A6.E7.9A.84.E5.AE.9A.E7.BE.A9"></span>数学的定義</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95&action=edit&section=1" title="節を編集: 数学的定義"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>点Xが経路AB上(3次元自由空間)を運動しており、原点Oから点Xまでの位置ベクトルを <i><b>r</b></i> とする。この時、任意の点Cにおいて、経路AB上を運動する点Xの速度ベクトルを引いていくと、その速度ベクトルが描く新たな曲線abが<b>ホドグラフ</b>である。 </p><p>例;点Xが速度 <i>v</i> で半径 <i>r</i> の等速円運動をする場合、そのホドグラフは、半径 <i>v</i> の円となる。 </p> <div class="mw-heading mw-heading2"><h2 id="性質"><span id=".E6.80.A7.E8.B3.AA"></span>性質</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95&action=edit&section=2" title="節を編集: 性質"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>この速度ベクトルの終点xが描く経路上の速度は、点Xの<a href="/wiki/%E5%8A%A0%E9%80%9F%E5%BA%A6" title="加速度">加速度</a>となっている。 </p> <div class="mw-heading mw-heading2"><h2 id="参考文献"><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span>参考文献</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95&action=edit&section=3" title="節を編集: 参考文献"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="reflist" style="list-style-type: decimal;"> <ol class="references"> <li id="cite_note-1"><b><a href="#cite_ref-1">^</a></b> <span class="reference-text"><cite style="font-style:normal" class="citation" id="CITEREF永田雅人2010">永田雅人『高速流体力学』森北出版、2010年、169頁。<style data-mw-deduplicate="TemplateStyles:r101121245">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation.cs-ja1 q,.mw-parser-output .citation.cs-ja2 q{quotes:"「""」""『""』"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:var(--color-success,#3a3);margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/%E7%89%B9%E5%88%A5:%E6%96%87%E7%8C%AE%E8%B3%87%E6%96%99/978-4-627-67361-8" title="特別:文献資料/978-4-627-67361-8">978-4-627-67361-8</a>。</cite><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=%E9%AB%98%E9%80%9F%E6%B5%81%E4%BD%93%E5%8A%9B%E5%AD%A6&rft.aulast=%E6%B0%B8%E7%94%B0%E9%9B%85%E4%BA%BA&rft.au=%E6%B0%B8%E7%94%B0%E9%9B%85%E4%BA%BA&rft.date=2010&rft.pages=169%E9%A0%81&rft.pub=%E6%A3%AE%E5%8C%97%E5%87%BA%E7%89%88&rft.isbn=978-4-627-67361-8&rfr_id=info:sid/ja.wikipedia.org:%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95"><span style="display: none;"> </span></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="関連記事"><span id=".E9.96.A2.E9.80.A3.E8.A8.98.E4.BA.8B"></span>関連記事</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E3%83%9B%E3%83%89%E3%82%B0%E3%83%A9%E3%83%95&action=edit&section=4" title="節を編集: 関連記事"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a 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