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class="31pt1" style="line-height: 39.35pt; background-color: transparent;">加工中心动态特性试验</span></p> <div class="Section1"> <p class="22" align="left" style="margin-bottom: 15.85pt; line-height: 39.35pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">5.2.1</span></span></st1:chsdate><span class="2SimSun"><span style="font-size: 11.5pt;">加工中心动态特性试验研宄对象</span></span></p> <p class="22" style="text-align:justify;text-justify:inter-ideograph;text-indent: 26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">本文中动态特性试验研宄的对象仍然是前一小节介绍的由沈阳某机床有限 公司生产的动梁龙门移动式加工中心，在本章就不再详细介绍了。</span></span></p> <!--[if !supportTextWrap]--> <!--[endif]--> <p class="22" align="left" style="margin: 15.9pt 0cm 4.9pt 33pt; text-indent: -24pt; line-height: 11.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="21"><span lang="EN-US">5.2.2</span></span></st1:chsdate><span class="2SimSun"><span style="font-size: 11.5pt;">加工中心动态特性试验目的</span></span></p> <p class="22" style="margin-top:0cm;margin-right:12.0pt;margin-bottom:0cm; margin-left:9.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">本次动态特性试验的目的通过动态特性试验的结果，我们可以得到该加工 中心的频率响应，结合上一章中我们得到的模态振型，可以使我们能对加工中 心的动态特性有更加深一步的了解。从而为我们日后安全合理的使用机床提供 指导与依据<sup>[97]</sup>。</span></span></p> <p class="22" align="left" style="margin: 0cm 12pt 0.0001pt 33pt; text-indent: -24pt; line-height: 29.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="21"><span lang="EN-US">5.2.3</span></span></st1:chsdate><span class="2SimSun"><span style="font-size: 11.5pt;">加工中心动态特性试验仪器装置与设备 此次模态参数试验所用到的试验设备如下表：</span></span></p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="571" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="210" align="left" style="line-height: 11pt; background: transparent;"><span class="21pt">表</span><span class="21pt">5. </span><span class="21pt">4动态特性试验仪器</span></p> <div align="center"> <table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;mso-table-layout-alt:fixed;mso-padding-alt: 0cm 0cm 0cm 0cm"> <tbody> <tr style="mso-yfti-irow:0;mso-yfti-firstrow:yes;height:25.7pt;mso-height-rule: exactly"> <td width="107" style="width: 80.4pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">编号</span></span></p> </td> <td width="280" style="width: 210pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 69pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">试验仪器</span></span></p> </td> <td width="184" style="width: 138pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 25.7pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 40pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">数量</span></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:34.3pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> <td width="280" style="width: 210pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; text-indent: -26pt; line-height: 15.6pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">力锤（含力传感器、信号传输电 缆及弹性冲击垫）</span></span></p> </td> <td width="184" style="width: 138pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 34.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:2;height:21.35pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">2</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 45pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">电荷放大器</span></span><span class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span class="2SimSun5"><span lang="EN-US">SD</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-5</span></span><span class="2SimSun5"><span lang="EN-US">A</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 21.35pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:3;height:23.75pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">3</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 61pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">加速度传感器</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 23.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:4;height:22.55pt;mso-height-rule:exactly"> <td width="107" valign="top" style="width: 80.4pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 39pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun5"><span lang="EN-US">(ONO</span></span><span class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: SimSun;"> </span></span><span class="2SimSun5"><span lang="EN-US">SOKKI</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-</span></span><span class="2SimSun5"><span lang="EN-US">NP</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-3414)</span></span></p> </td> <td width="184" valign="top" style="width: 138pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> </tr> <tr style="mso-yfti-irow:5;height:24.25pt;mso-height-rule:exactly"> <td width="107" style="width: 80.4pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">4</span></span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 45pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">双通道傅里叶分析仪</span></span></p> </td> <td width="184" style="width: 138pt; padding: 0cm; height: 24.25pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> <tr style="mso-yfti-irow:6;height:22.55pt;mso-height-rule:exactly"> <td width="107" valign="top" style="width: 80.4pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> <td width="280" style="width: 210pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 39pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun5"><span lang="EN-US">(ONO</span></span><span class="2SimSun"><span lang="EN-US" style="font-size: 11.5pt; font-family: SimSun;"> </span></span><span class="2SimSun5"><span lang="EN-US">SOKKI</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-</span></span><span class="2SimSun5"><span lang="EN-US">CF</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">7200</span></span><span class="2SimSun5"><span lang="EN-US">A</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span></p> </td> <td width="184" valign="top" style="width: 138pt; padding: 0cm; height: 22.55pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="MsoNormal"><span lang="EN-US" style="font-size:5.0pt; mso-bidi-font-family:"Times New Roman";color:windowtext;mso-ansi-language: EN-US"> </span></p> </td> </tr> <tr style="mso-yfti-irow:7;mso-yfti-lastrow:yes;height:25.2pt;mso-height-rule: exactly"> <td width="107" style="width: 80.4pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="center" style="text-align:center;line-height:11.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:428.4pt;mso-element-wrap:no-wrap-beside;mso-element-anchor-vertical: paragraph;mso-element-anchor-horizontal:column;mso-element-left:center; mso-element-top:.05pt;mso-height-rule:exactly"><span class="2SimSun"><span style="font-size: 11.5pt;">5</span></span></p> </td> <td width="280" style="width: 210pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 61pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">数据处理终端</span></span></p> </td> <td width="184" style="width: 138pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 25.2pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" align="left" style="margin-left: 50pt; line-height: 11.5pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">1</span></span></p> </td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> </div> <!--[if !supportTextWrap]--> <div> </div> <p class="22" align="left" style="margin: 15.65pt 0cm 4.9pt; line-height: 11.5pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="21"><span lang="EN-US">5.2.4</span></span></st1:chsdate><span class="2SimSun"><span style="font-size: 11.5pt;">加工中心动态特性试验方法</span></span></p> <p class="22" style="margin-right:19.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:24.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">一般来讲，模态测试试验首先需对被测结构施加动态激励，该激励信号一 般由电磁激振器或力锤提供。通过对测量的激振力信号与响应信号高速采集后， 通过谱分析、脉冲响应测量及传递函数估计等时域或频率信号处理方法对测量 的信号进行分析。在频域分析中，经常采用快速傅立叶变换</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span class="2SimSun5"><span lang="EN-US">FFT</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">)</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">将时域数据 转换到频域，并计算出结构的频响函数。鉴于机床自身的结构难于与与电磁激 振器集成，故本节采用典型的瞬态激励方法一锤击法对测试装置的固有频率进 行测试<sup>[98]</sup>。锤击法是利用集成有力传感器的力锤敲击被测结构，即被测结构的 输入信号为激励力信号，通过对测量激振力与加速度响应信号的双通道</span></span><span class="2SimSun5"><span lang="EN-US">FFT</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">分 析，得到结构的传递函数，并通过函数拟合方法，识别出被测结构的模态参数， 利用锤击法测量结构模态参数的原理如下图所示。</span></span></p> <p class="22" align="left" style="text-indent: 24pt; line-height: 23.3pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">利用锤击法做试验，首先要确定锤击点，根据前几章得到的整机的模态振 型，我们确定了 3个锤击点，即滑枕下端</span></span><span class="2SimSun5"><span style="font-family: 宋体;">X</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">、</span></span><span class="2SimSun5"><span lang="EN-US">Y</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">、</span></span><span class="2SimSun5"><span lang="EN-US">Z</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">三个方向具体锤击点如下图：</span></span></p> <p class="22" style="margin-top:0cm;margin-right:0cm;margin-bottom:6.7pt; margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph;line-height: 11.5pt;mso-line-height-rule:exactly;background:transparent"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="21"><span lang="EN-US">5.2.5</span></span></st1:chsdate><span class="2SimSun"><span style="font-size: 11.5pt;">加工中心动态特性试验结果分析与对比</span></span></p> <p class="22" align="right" style="margin-right:7.0pt;text-align:right;line-height: 23.3pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">本次试验采用针对同一锤点多次测量的方法，对于每一个方向</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">（</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">滑枕的</span></span><span class="2SimSun5"><span style="font-family: 宋体;">X</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">、</span></span></p> <p class="22" style="margin-top:0cm;margin-right:0cm;margin-bottom:51.45pt; margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph;line-height: 23.3pt;mso-line-height-rule:exactly;background:transparent"><span class="2SimSun5"><span lang="EN-US">Y</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: MingLiU;">、</span></span><span class="2SimSun5"><span lang="EN-US">Z</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">方向）两次测量结果差异不大，我们即认为测量是准确的原则。由于傅里 叶分析仪可以输出的图像对于频率的大小观看的不是很直观，所以我们从傅里 叶分析仪中提取了数据，并且运用</span></span><span class="2SimSun5"><span lang="EN-US">Origin</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">软件画出曲线如下：</span></span><span style="font-family: 'Times New Roman'; font-size: 7pt;"> </span></p> <p class="22" style="margin-left:20.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:26.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">从上面模态参数图中，我们可以看出，锤点在滑枕的三个方向上的固有频 率相差不大，都在</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">33</span></span><span class="2SimSun5"><span lang="EN-US">Hz</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">左右，所以我们可以认为该加工中心的固有频率为</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">33</span></span><span class="2SimSun5"><span lang="EN-US">Hz </span></span><span class="2SimSun"><span style="font-size: 11.5pt;">左右。在前面我们已经介绍过，整机在实际工作过程中外界的激振力的频率在 </span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">35</span></span><span class="2SimSun5"><span lang="EN-US">Hz</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">-50</span></span><span class="2SimSun5"><span lang="EN-US">Hz</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">之间，而我们试验的结果小于这个频率，所以我们可以断言，整机 在实际的工作过程中，在正常的工作条件下是不会发生共振的。有限元分析由 于有阻尼的影响以及结合面的处理可能不是很完善，所以有限元的模态分析结 果通常是会比实际情况偏小，但是有限元得出的模态振型是可信的。本章的模 态实验主要是为了得到更为准确的模态参数，结合上一章模态分析得出的模态 振型，我们对于该加工中心的动态特性己经有了很深的了解。通过之前的模态</span></span></p> <p class="22" align="left" style="margin: 0cm 0cm 23.25pt 19pt; line-height: 23.3pt; background: transparent;"><span class="2SimSun"><span style="font-size: 11.5pt;">分析以及本章的模态实验，我们己经得到了研宄机床静动态特性的必备条件， 这些数据对于我们后续关于相关机床的结构优化以及本机床的安全使用都提供 了非常有用的指导和依据。</span></span></p> <p class="30" style="margin-top:0cm;margin-right:0cm;margin-bottom:15.4pt; margin-left:19.0pt;line-height:13.0pt;mso-line-height-rule:exactly;mso-pagination: lines-together;page-break-after:avoid;background:transparent"><a name="bookmark58"><span class="31pt1">5.3</span></a><span class="31pt1">本章小结</span></p> <p class="22" style="margin-left:19.0pt;text-align:justify;text-justify:inter-ideograph; text-indent:23.0pt;line-height:23.3pt;mso-line-height-rule:exactly;background: transparent"><span class="2SimSun"><span style="font-size: 11.5pt;">本章首先运用</span></span><span class="2SimSun5"><span lang="EN-US">JM</span></span><span class="2SimSun"><span style="font-size: 11.5pt; font-family: SimSun;">3815</span></span><span class="2SimSun"><span style="font-size: 11.5pt;">无线静动态应力应变仪采集了结构的应力应变数据, 一方面得到了结构在实际工作过程中的应力应变数据，另一方面验证了有限元 仿真的准确性。其次运用傅里叶分析仪对结构进行了模态实验得到了结构准确 的模态参数，集合上一章得到的结构的模态振型，使我们对于机床的静态特性 有了更深一步的了解。</span></span></p> </div> <p><span style="font-size:11.0pt;font-family:"Times New Roman";mso-fareast-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“龙门加工中心整机及关键部件静动态特性分析与试验研究”，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=%E9%BE%99%E9%97%A8%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>龙门加工中心</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=%E6%95%B0%E6%8E%A7%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>数控加工中心</a> <a href='/index.php?case=tag&act=show&tag=CNC%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>CNC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 --> 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