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12pt;">3.2</span></span><span class="100pt1" style="line-height: 21.85pt; background-color: transparent;"><span style="font-size: 12pt;">频响函数的测试</span></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">频率响应函数</span><span class="2"><span style="font-family: SimSun;">(</span></span><span class="211pt1"><span lang="EN-US" style="font-size: 11pt;">FRF</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">描述了结构上输入点与输出点之间的频率函数，</span><span class="211pt1"><span lang="EN-US" style="font-size: 11pt;">FRF</span></span><span class="2">的测 量和计算可以通过输入输出通道的互功率谱除以输入的自功率谱估计获得。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:19.9pt; margin-left:0cm;text-indent:29.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"><span class="2">每个频率响应函数是通过输入采样信号与输出采样信号计算获得。</span></p> <p class="101" style="margin-top:0cm;margin-right:0cm;margin-bottom:2.95pt; margin-left:0cm;line-height:12.0pt;mso-line-height-rule:exactly;background: transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="100"><span lang="EN-US">3.2.1</span></span></st1:chsdate><span class="100pt1">试验对象的支承方式</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">试验对象的支承方式应尽量实现实际结构所要求的边界条件。例如:飞行段的 运载火箭应处于自由悬空状态;机床应约束支承在刚性基础上，并要求机床与地基 连接的边界条件与设计状态</span><span class="2"><span style="font-family: 'Times New Roman';">•</span></span><span class="2">致。下面分别讨论这两种支承方式。</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"><span style="font-family: SimSun;">(1)</span></span><span class="2">约束支承方式</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">将试验对象安装在基础上(图3-3(幻)。理想的情况是基础绝对刚性、也就是当 激励试验对象时，基础绝对不动，即激励力对基础的位移频响函数值为零。实际 上这是不可能实现的</span><span class="2MSMincho"><span style="font-size: 8.5pt;">。一</span></span><span class="2">般认为，如果在整个试验频带内，基础上的频响函数值 远小于试验对象结构上的频响函数值，可以近似认为满足了约束支承的要求。为 此，通常要求基础的质量至少为试验对象质量的]0倍，这样，基础对试验对象动 态特性的影响一般可忽略。</span></p> <!--[if !supportTextWrap]--> <!--[endif]--> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:27.0pt;margin-bottom:.0001pt;line-height:21.85pt;mso-line-height-rule: exactly;tab-stops:337.55pt;background:transparent"><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="2"><span style="font-family: SimSun;">(2)</span></span><span class="2">自由支承方式</span><span class="2"> </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">理想的自由状态是试验对象处于悬空状态</span><span class="2">，</span><span class="2">这时</span><span class="2">，</span><span class="2">试验对象结构有六个固有</span><span class="2"> </span><span class="2">频率为零的刚体模态</span><span class="2">，</span><span class="2">其中三个为平移模态</span><span class="2">；</span><span class="2">三个为转动模态。实际上，真正的 自由状态是难以在试验室内实现的，只能采用某种适当的方式(如空气弹簧和气、 磁悬挂装置>支承试验对象(图</span><span class="2"><span style="font-family: SimSun;">3.3</span></span><span class="2">〇</span><span class="2"><span style="font-family: SimSun;">^</span></span><span class="211pt1"><span lang="EN-US" style="font-size: 11pt;">c</span></span><span class="2">：〇</span><span class="2"><span style="font-family: SimSun;">,</span></span><span class="2">近似模拟自由状态。这时，试验对象刚 体模态频率不再为零，它的值与试验对象质量特性和支承装置的刚度特性有关。 为了减小悬挂系统(试验对象作为刚体与弹性支承装置组成的系统</span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">对试验对象结 构弹性模态的影响，要求悬挂系统具有较低的刚度、较小的附加质量和零摩擦力。 悬挂系统的固有频率与悬挂点布置一般应满足下列要求：</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 21.85pt; background: transparent;"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">悬挂系统的固有频率为试验对象结构弹性模态基本固有频率的</span><span class="2"><span style="font-family: SimSun;">1/10-1/5</span></span><span class="2">以 下。否则，应考虑悬挂系统对试验对象弹性模态特性的影响；</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt; text-indent: 27pt; line-height: 21.85pt; background: transparent;"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">2)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">悬挂点应尽量选在试验对象结构刚度较大的节点附近，避免结构悬挂的静 应力引起结构刚度变化，并确保悬挂系统稳定；</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:45.3pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">3)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">减小悬挂系统引起的附加阻尼对结构试验对象的影响；</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:45.3pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">4)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">试验对象的悬挂方向最好与结构主振方向垂直。</span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:20.7pt; margin-left:0cm;text-indent:29.0pt;line-height:21.85pt;mso-line-height-rule: exactly;background:transparent"><span class="2">模态试验中，试验夹具和支承系统的设计与验证相当重要。当发现夹具和支 承系统的动态特性对所试验结构有明显影响时，应将试验对象连同夹具一起作为 整体进行动态分析。随着试验对象结构愈来愈大，要设计一个具有理想界面或与 试验对象藕合较小的夹具也愈来愈困难，费用也相当昂贵，有的需从试验方法(如 惯性质量界面和残余柔度)去解决这些矛盾。</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' 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