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transparent;">在做模态试验时，一般希望将试验对象悬挂点选择在振幅较小的位置。为此 需要预先确定最佳悬挂位置。如果仅仅要求测试一阶模态，则最佳悬挂位置是在 该阶模态的节点处。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:29.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span class="2">为保证系统的可辨识性(可控和可观</span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">，</span><span class="2">一般要求激励点不应靠节点或节线太 近。这就要求</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODP</span></span><span class="2"><span style="font-family: SimSun;">(</span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">OptionalDrivingPoint</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">最佳激励点的位移响应值不等于零，激 励点应该避免选择在</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODP</span></span><span class="2">最佳激励点的值等于零之处，在该点激励，某些模态将 不能被激励出来。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:29.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span class="2">当使用力锤法时，最佳激励位置的选择除了应该满足</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODP</span></span><span class="2">最佳激励点的值不 等于零之外，还应该避免选择平均驱动自由度速度的值较大的那些点，因为在平 均驱动自由度速度的值较大的那些点处，容易产生双击现象。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:29.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span class="2">当使用激振器激励时，最佳激励位置的选择除了应该满足</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODP</span></span><span class="2">最佳激励点的 值不等于零之外，还应该避免选择平均驱动自由度加速度的值较大的那些点，因 为在平均驱动自由度加速度的值较大的那些点处，激振器附加质量的影响较大。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 20.7pt; text-indent: 29pt; line-height: 21.85pt; background: transparent;"><span class="2">测试点所测得的信息要求有尽可能高的信噪比，因此，测试点不应该靠近节 点。注意到实际上使用的一般都是加速度传感器。实际测得的都是加速度信号、 因此在最佳测试点的位置，其平均驱动自由度加速度的值应该较大。确定最佳测 试点的方法通常用 </span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">El</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">(Effective</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">Independence</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">法[<sup>48]</sup>。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 20.7pt; text-indent: 29pt; line-height: 21.85pt; background: transparent;"> </p> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman"">本文采摘自“</span><span lang="EN-US" style="font-size:9.0pt">VMC1060</span><span style="font-size:9.0pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">型立式加工中心试验模态分析”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span><span lang="EN-US" style="font-size:9.0pt"> <o:p></o:p></span></p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=1060%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>1060加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E7%AB%8B%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>立式加工中心</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' target='_blank'>加工中心</a> <div class="blank30"></div> <!--自动调用自定义字段--> <div class="blank20"></div> <div class="blank30"></div> <!-- 投票 --> <script src="/index.php?case=vote&act=view&aid=701"></script> <!-- 自定义表单开始 --> <!-- 自定义表单结束 --> <div class="blank60"></div> <!-- 上下页开始 --> <div id="page"> <strong>上一篇</strong><a 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