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transparent;">实验模态分析方法可以分为频响函数法（简称测力法</span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">）</span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">和环境激励法（简称 不测力法）两种，所谓测力法就是在试验过程中需要同时测量激励力和响应的方 法。经典的测力法是利用频域的频响函数</span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">（</span><span class="211pt5" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span lang="EN-US" style="font-size: 11pt;">FRF</span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span style="font-family: SimSun;">)</span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">或时域的脉冲响应函数</span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">（</span><span class="211pt5" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span lang="EN-US" style="font-size: 11pt;">IRF</span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span style="font-family: SimSun;">) </span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">对模态参数进行估计。频响函数是响应和力的傅里叶变换之比，而脉冲响应函数 也要先测得频响函数然后经傅里叶逆变换</span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">（</span><span class="211pt5" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span lang="EN-US" style="font-size: 11pt;">IFFT</span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;"><span style="font-family: SimSun;">)</span></span><span class="2" style="line-height: 21.85pt; text-indent: 27pt; background-color: transparent;">获得。因此，测力法必须利用 带测力计的激振器或力锤施加可测量的激励力。测力法可以估计所有的模态参数， 包括固有频率、模态振型、模态阻尼或阻尼比、模态质量和模态刚度，而且精度 较高。</span></p> <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="2">常用软件中频域测力法分图解法和解析法两种，图解法较适合于阻尼小模态 不密集系统，如钢结构。图解法可选用峰值拾取法或圆拟合法。解析法常用于大 阻尼或模态密集系统。时域测力法普遍采用脉冲响应函数的最小二乘复指数法 </span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">LSCE</span></span><span class="2"><span style="font-family: SimSun;"> (</span></span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">LeastSquareComplexExponential</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">进行计算，频域解析法[<sup>43</sup>][<sup>44</sup>]可选用正 交多项式法。</span></p> <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="2">所谓不测力法就是在试验过程中不需要测量激励力的方法。工程中的大量结 构和机器（如大型建筑，大型桥梁，汽轮发电机组等）都是很难人工施加激励力 的，其结构的响应主要由环境激励引起，如机器运行时由质量不平衡产生的惯性 力，车辆行驶时的振动以及微地震产生的地脉动等各种环境激励，而这些环境激 励是既不可控制又难以测量的。</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 21.85pt; background: transparent;"><span class="2">不测力法只能利用系统的响应数据对固有频率、模态振型、模态阻尼或阻尼 比这三个模态参数进行估计，但是这三个模态参数已经能够满足绝大多数工程中 结构动力特性分析的要求。软件会利用测量得到的响应的自功率谱、互功率谱、 传递率和相干函数进行模态参数的估计。</span></p> <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="2">不测力法也可分为解析法和图解法两种类型。使用范围与测力法一致。图解 法可选用自互功率谱综合法或传递率法，解析法可选用随机子空间法</span><span class="2">（</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">SSI</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">。</span></p> <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="2">另外利用软件还可以通过时域和频域的</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODS</span></span><span class="2">动画显示更形象地模拟被测结 构或机械零件的振动。所谓时域的</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODS</span></span><span class="2">动画显示，其原理类似于录像机快录慢放。 常用于机器起动或停止时的动响应</span><span class="2">（</span><span class="2">如位移、速度或加速度）相对于时间变量的 观测。频域的</span><span class="211pt5"><span lang="EN-US" style="font-size: 11pt;">ODS</span></span><span class="2">动画显示，其原理类似于数字闪频仪，用于动变形相对于频率</span><span style="line-height: 22.3pt; background-color: transparent;">变量的观测。当观测到的频率接近或等于共振频率时，动变形可近似的作为结构 的振型。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:21.3pt; margin-left:0cm;text-indent:28.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"><span class="2">试验模态分析的过程如图</span><span class="2"><span style="font-family: SimSun;">3.1</span></span><span class="2">所示。对被测试件上的各点施加激振力，同时 测出其响应；接着用信号分析设备求出激振点与响应点之间的传递函数，如果要 求振动模态，尚需对试件上的各点反复地求出传递函数；然后进行曲线拟合，识别 得出固有频率、模态刚度、模态阻尼、模态质量和模态振型等参数；最后根据所 得到的模态参数，在显示屏幕上将振动模态的动态过程显示出来。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:21.3pt; margin-left:0cm;text-indent:28.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New Roman";mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">本文采摘自“</span><span lang="EN-US" style="font-size: 9.0pt;font-family:"Times New Roman";mso-fareast-font-family:宋体;mso-font-kerning: 1.0pt;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language: AR-SA">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";mso-bidi-font-family: "Times New Roman";mso-font-kerning:1.0pt;mso-ansi-language:EN-US;mso-fareast-language: ZH-CN;mso-bidi-language:AR-SA">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></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=697"></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 href="/bethel/news/show_696.html">Polymax 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