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w:st="on" style="line-height: 14pt; background-color: transparent;"></st1:chsdate><span style="font-size: small;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on" style="line-height: 14pt; background-color: transparent;"><span class="612pt2"><span lang="EN-US">3.2.5</span></span></st1:chsdate><span class="6" style="line-height: 14pt; background-color: transparent;">线性定常假设的检验</span></span></p> <p class="60" style="margin-top:0cm;margin-right:0cm;margin-bottom:2.05pt; margin-left:0cm;line-height:14.0pt;mso-line-height-rule:exactly;mso-pagination: lines-together;page-break-after:avoid;background:transparent"><a name="bookmark27"></a></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 style="font-size: small;"><span class="2">根据以上试验模态分析理论，为了获得传递函数矩阵的最终参数形式，对试 验数据进行模态分析之前，通常做一下基本假设。</span></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.85pt;mso-line-height-rule:exactly;mso-list:l0 level1 lfo1; tab-stops:44.85pt;background:transparent"><span style="font-size: small;"><!--[if !supportLists]--><span style="font-family: SimSun;">(1)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">线性假设，即假设结构及其动态特性是线性的。就是说任何输入组合引起 的输出等于各自输出的组合。</span></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.85pt;mso-line-height-rule:exactly;mso-list:l0 level1 lfo1; tab-stops:45.55pt;background:transparent"><span style="font-size: small;"><!--[if !supportLists]--><span style="font-family: SimSun;">(2)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">时不变性(即定常)假设，即假设结构的模型及其动态特性不随时间而变化， 因而微分方程的系数矩阵是与时间无关的常数矩阵。当系统因测试附加传感器而 产生的附加质量后，仍保持其时不变性。</span></span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:27.0pt; line-height:21.85pt;mso-line-height-rule:exactly;mso-list:l0 level1 lfo1; tab-stops:45.8pt;background:transparent"><span style="font-size: small;"><!--[if !supportLists]--><span style="font-family: SimSun;">(3)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">可观测性假设，即假设用以确定我们所关心的系统动态特性所需的全部数 据是可以测量的。为了避免出现可观测性问题，应该合理选择响应自由度。</span></span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:27.0pt;margin-bottom:.0001pt;text-indent:0cm;line-height:21.85pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:47.85pt; background:transparent"><span style="font-size: small;"><!--[if !supportLists]--><span style="font-family: SimSun;">(4)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">互易性假设，即假设结构遵从</span><span class="211pt5"><span lang="EN-US">Maxwell</span></span><span class="2">互易性原理，即在彳点输入所引。 在实验过程中，由于多种实际因素的影响，使得实验所得的原始数据中常常</span></span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; line-height: 21.85pt; background: transparent;"><span style="font-size: small;"><span class="2">包含有干扰因素。利用试验模态分析技术研究机床动态特性的一个重要前提就是 机床结构应该满足各种假设的条件与范围。特别对多种结合部的复杂机床结构系 统，为保证试验的可靠性和有效性，模态试验前应进行以下前期的准备试验： 互易性检验:模态分析的理论基础是建立在线性系统基础上的。这就要求测试 前机床结构的非线性误差比较小。在脉冲激振试验中可以通过互易测点和敲击点 的方法进行检验。</span></span></p> <p class="21" align="left" style="margin: 0cm 0cm 21.3pt; text-indent: 27pt; line-height: 21.85pt; background: transparent;"><span style="font-size: small;"><span class="2">相干性检验:利用激振力的频谱</span><span class="211pt5"><span lang="EN-US">F</span></span><span class="2">①和加速度的频谱</span><span class="211pt5"><span lang="EN-US">A</span></span><span class="2"><span style="font-family: SimSun;">(</span></span><span class="211pt5"><span lang="EN-US">f</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">可计算出相干函数</span><span class="211pt5"><span lang="EN-US">Y</span></span><span class="2"><sup><span style="font-family: SimSun;">2</span></sup></span><span class="2">。</span><span class="2"><span style="font-family: SimSun;"> </span></span><span class="2">相干函数</span><span class="211pt5"><span lang="EN-US">Y</span></span><span class="2"><sup><span style="font-family: SimSun;">2</span></sup></span><span class="2">在</span><span class="2"><span style="font-family: SimSun;">0-1</span></span><span class="2">之间，它表征实验结果的可靠性以及评价传递函数估计的可信 度。一般情况下，</span><span class="211pt5"><span lang="EN-US">Y</span></span><span class="2"><sup><span style="font-family: SimSun;">2</span></sup></span><span class="2">越接近于1,表明实验所受的干扰越小，_的结果越可靠， 通常要求相干函数应大于0.8，最好是大于<span style="font-family: SimSun;">0.9</span>。</span></span></p> <p class="60" style="margin-top:0cm;margin-right:0cm;margin-bottom:14.05pt; margin-left:0cm;line-height:14.0pt;mso-line-height-rule:exactly;mso-pagination: lines-together;page-break-after:avoid;background:transparent"><a name="bookmark28"></a><span style="font-size: small;"><a name="bookmark28"><span class="613pt1"><span lang="EN-US">3.3</span></span></a><span class="6">本章小结</span></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"> </p> <p><span style="font-size: small;"> <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">本章从试验模态分析的整体观点出发，先讨论了激励系统、力传感器和运动 传感器、测试与分析系统以及具体试验设计的一些基本问题。不同的测试与分析 系统，它们在性能、灵活性、大小和价格等方面是有区别的，需要试验设计者根 据不同的需要进行选取。在确定了模态分析与测试系统后，设计模态分析试验时，</span>试验工程师应当利用尽可能多的信息。从这一观点出发，传递函数的测试这一部 分主要讨论了正确选择响应点和激励点的一些理论和方法;信号采集过程中的一 些参数设置，以及针对不同试验结构的频段选取。本章的试验模态分析技术为后 面具体的机床模态试验设计奠定了基础。</p> </span></p> <p> </p> <p><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 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