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<HTML><HEAD><TITLE>new</TITLE><META content="text/html; charset=gb2312" http-equiv=Content-Type><LINK href="text.css" rel=stylesheet type=text/css><META content="Microsoft FrontPage 4.0" name=GENERATOR></HEAD><body leftmargin="15"><center><b><br>6 广义力</b></center> <table border="0" cellpadding="0" cellspacing="0" width="560"> <tr> <td width="20"><b><font color="#0000FF">一、</font></b></td> <td width="540" colspan="2"><b><font color="#0000FF">广义力的概念</font></b></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2">质点系任一质点坐标可用广义坐标 qh ( h = 1,2,…,k) 表示：</td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><img border="0" src="pic2/3072_174.GIF" width="259" height="26"></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>求变分，得用广义坐标变分表示的虚位移：</td> <td><img border="0" src="pic2/3072_175.GIF" width="243" height="56"></td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2">该质点上的力所作虚功：</td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><img border="0" src="pic2/3072_176.GIF" width="474" height="56"></td> </tr> <tr> <td width="20"></td> <td width="294">整个质点系上所有（主动）力所作虚功：</td> <td width="246">↓对应第 h个广义坐标的广义力</td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><img border="0" src="pic2/3072_177.GIF" width="543" height="134"></td> </tr> <tr> <td width="20"><b><font color="#0000FF">二、</font></b></td> <td width="540" colspan="2"><b><font color="#0000FF">广义力的求法</font></b></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><font color="#0000FF">1. 解析法</font><font color="#800000">——由各力及其作用点求</font></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><img border="0" src="pic2/3072_178.GIF" width="243" height="56"></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2">用直角坐标表示：</td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><img border="0" src="pic2/3072_179.GIF" width="376" height="56"></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"><font color="#0000FF">2. 几何法</font><font color="#800000">——由虚功求</font></td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td>质点系虚功： </td> <td><img border="0" src="pic2/3072_180.GIF" width="138" height="56"></td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2">若只给定第h个广义坐标的虚位移，其余广义坐标的虚位移为0，则</td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"> <table border="0" cellpadding="0" cellspacing="0"> <tr> <td><img border="0" src="pic2/3072_181.GIF" width="111" height="26"> </td> <td><img border="0" src="pic2/3072_182.GIF" width="148" height="51"></td> </tr> </table> </td> </tr> <tr> <td width="20"></td> <td width="540" colspan="2"></td> </tr> <tr> <td width="560" colspan="3"> <p align="center"> <a href="3071_5.htm"><font color="#FF6666">[ 上一节 ]</font></a> <a href="3072_11.htm">↓下一页↓</a> <a href="3072_2.htm"><font color="#00CC00">[ 下一节 ]</font></a> </td> </tr> </table> </BODY></HTML> ⌨️ 快捷键说明
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