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style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><span class="115Constantia" style="line-height: 13pt; text-indent: 0cm; background-color: transparent;"><span lang="EN-US" style="font-size: 13pt;">Polymax</span></span><span class="115" style="line-height: 13pt; text-indent: 0cm; background-color: transparent;"><span lang="EN-US"> </span></span><span class="115" style="line-height: 13pt; text-indent: 0cm; background-color: transparent;"><span style="font-family: 宋体;">法</span></span></p> <div class="Section1"> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.85pt;mso-line-height-rule:exactly;background:transparent"><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">PolyMax</span></span><span class="2">模态识别方法属于多自由度时域识别法</span><span class="2"><sup>[41]</sup></span><span class="2">，</span><span class="2">也称作多参考点最小二</span><span class="2"> </span><span class="2">乘复频域法</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt; font-family: 宋体;">（</span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">Polyreference</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">least</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">squares</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">complex</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">frequency</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">domain</span></span><span class="2"><span lang="EN-US"> </span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">method</span></span><span class="2">)，</span><span class="2">是最</span><span class="2"> </span><span class="2">小二乘复频域法</span><span class="2">(</span><span class="211pt4"><span lang="EN-US" style="font-size: 11pt;">lscf</span></span><span class="2">)</span><span class="2">的多输入形式</span><span class="2">，</span><span class="2">是一种对极点和模态参预因子进行整体估</span><span class="2"> </span><span class="2">计的多自由度法</span><span class="27pt"><span style="font-size: 7pt;">，</span></span><span class="27pt"><span style="font-size: 7pt;">一</span></span><span class="2">般首先通过实验建立稳态图</span><span class="2">，</span><span class="2">以判定真实的模态频率、阻尼和</span><span class="2"> </span><span class="2">参预因子</span><span class="2">；</span><span class="2">建立可以线性化的直交矩阵分式模型</span><span class="2">，</span><span class="2">然后基于正则方程缩减最小二</span><span class="2"> </span><span class="2">乘问题</span><span class="2">，</span><span class="2">得到压缩正则方程</span><span class="2">，</span><span class="2">于是模态参数可以通过求解最小二乘问题得到。该方 法集合了多参考点法和</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">LSCF</span></span><span class="2">方法的优点，可以得出非常清晰的稳态图，并且密集空 间可以被分离出来，尤其在模态较密集的系统</span><span class="2">(</span><span class="2">动力总成系统)，或者</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">FRF</span></span><span class="2">数据受到 严重噪声污染的情况下仍可以建立清晰的稳态图，识别出高度密集的模态，对每<br clear="all" style="page-break-before:always" /> 一个模态的频率、阻尼和振型都有很好的识别精度，是国际最新发展并流行的基于 传递函数的模态分析方法。其基本思想如下：</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt 33pt; line-height: 21.85pt; background: transparent;"><span class="2">(1)</span><span class="2">建立频率响应函数模型</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 22.55pt; background: transparent;"><span class="2">多参考点最小二乘复频域识别技术</span><span class="2">（</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">PRLSCF</span></span><span class="2">或</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">PolyMAX</span></span><span class="2">)</span><span class="2">要以频响函数矩 阵作为识别的初始数据，其数学模型采用右矩阵分式模型来描述。在频域中，系 统输出0(0=1，</span><span class="2">2...,</span><span class="2">爪，其中為为输出点数)和全部输入的关系可用右矩阵分式模 型</span><span class="2">（</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">RMFD</span></span><span class="2">)</span><span class="2">来描述，右矩阵分式模型的表达式为<a name="bookmark20"><o:p></o:p></a></span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 22.55pt; background: transparent;"><span class="6TimesNewRoman1"><i><span lang="EN-US" style="font-size: 27pt; font-family: Consolas; letter-spacing: -1pt;"> </span></i></span></p> <p class="60" style="margin-top:0cm;margin-right:0cm;margin-bottom:15.9pt; margin-left:0cm;line-height:14.0pt;mso-line-height-rule:exactly;mso-pagination: lines-together;page-break-after:avoid;background:transparent"><span class="6TimesNewRoman1"><span lang="EN-US" style="font-size: 12pt;">2.5</span></span><span class="6">本章小结</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:22.1pt;mso-line-height-rule:exactly;background:transparent"><span class="2">本章简单介绍了模态试验的相关理论和模态分析的基本步骤，包括模态分析 理论与试验模态分析理论，揭示了传递函数与模态参数之间的关系。重点介绍了 从传递函数到得到模态参数的识别过程的理论基础。</span></p> </div> <p><span style="font-size:10.0pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"; mso-bidi-font-family:"Times New Roman";mso-ansi-language:#0400;mso-fareast-language: #0400;mso-bidi-language:AR-SA"><br clear="all" style="page-break-before:always; mso-break-type:section-break" /> </span></p> <p> </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=696"></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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