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"/images/banner/s5.jpg"; var randomBgIndex = Math.round( Math.random() * 4 ); //输出随机的背景图 document.write('<style>.banner{background:url(' + bodyBgs[randomBgIndex] + ') no-repeat 50% bottom}</style>'); //]]> </script> <section> <div class="banner" style="height:160px;"> </div> </section> <!-- 面包屑导航开始 --> <div class="container "> <nav class="sub_menu"> <ol class="breadcrumb"><span class="glyphicon glyphicon-list"></span> <li><a href="/">网站首页</a></li> <li><a title="技术文章" href="/bethel/NC">技术文章</a></li> <li><a title="数控文章" href="/bethel/news">数控文章</a></li> </ol> </nav> </div> <!--/sub_menu--><!-- 面包屑导航结束 --> <!-- 页面标题开始 --> <div class="title"> <h3><a>关于立式加工中心动态特性的试验研究<small></small></a></h3> </div> <!-- 页面标题结束 --> <hr class="featurette-divider"> <!-- 中部开始 --> <div class="container"> <!-- 正文 --> <div class="lead" id="print"> <p><span style="font-size: small;"> </span><a name="bookmark3" style="line-height: 16pt; background-color: transparent;"><span style="font-size: small;"><span class="4">1基于模态试验的动态特性分析</span></span></a></p> <p class="91" style="margin-bottom:5.05pt;text-indent:0cm;line-height:10.0pt; mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="91pt"><span style="font-family: SimSun;">1.1</span></span><span class="91pt">试验方案</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.6pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">模态试验是研究结构动态特性的有效手段之一</span></span><span class="40"><a href="file:///E:/%E7%BD%91%E7%AB%99%E5%8D%95%E7%8B%AC%E8%B5%84%E6%96%99/%E5%9B%BE%E4%B9%A6/2015%E6%96%B0%E5%9B%BE%E4%B9%A6/%E6%9C%9F%E5%88%8Adoc/KVC800%E7%AB%8B%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83%E5%8A%A8%E6%80%81%E7%89%B9%E6%80%A7%E7%9A%84%E8%AF%95%E9%AA%8C%E7%A0%94%E7%A9%B6_%E8%92%8B%E7%8E%B2%E8%8E%89.doc#_ftn1" name="_ftnref1" title=""><span style="font-size: small;"><sup><!--[if !supportFootnotes]--><span class="40"><sup><span style="color: black;">[1]</span></sup></span><!--[endif]--></sup></span></a></span><span style="font-size: small;"><span class="40">，合理的试验方案有助于模态试验的开展。因此，对 </span><span class="4TimesNewRoman0"><span lang="EN-US">KVC</span></span><span class="40"><span style="font-family: SimSun;">800</span></span><span class="40">立式加工中心进行模态试验时，首先需要确定出较为合适试验方案。该加工中心结构主要由工作 台、床身、立柱、主轴箱等组成，工作台作纵向进给，床鞍作横向进给，主轴箱作垂向进给运动，三个进 给方向导轨均为矩形导轨，电机带动滚珠丝杠通过导轨实现三个方向的运动。试验过程中采用采用单点激 励多点响应开展模态测试，根据</span><span class="4TimesNewRoman0"><span lang="EN-US">KVC</span></span><span class="40"><span style="font-family: SimSun;">800</span></span><span class="40">立式加工中心的结构特点，通过</span><span class="4TimesNewRoman0"><span lang="EN-US">Ansys</span></span><span class="40">有限元模态分析，获取加 工中心的主要振型，以此为依据，确定激振点与响应点的布置方案。</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.6pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">工作台激励点布置在其振型较大的四个角点中任一角点附近；床身激励点则布置在其振型变化大的上 半部分右侧面；立柱部分激励点施加在其振型变化明显的上右侧面；主轴箱部分由于其结构特点，将激励 点布置在有较明显振动的底部主轴的圆柱面上。</span></span></p> <p class="42" style="margin-bottom:10.5pt;text-align:justify;text-justify:inter-ideograph; text-indent:23.0pt;line-height:15.6pt;mso-line-height-rule:exactly;background: transparent"><span style="font-size: small;"><span class="40">以有限元分析结果为指导，并考虑加速度传感器以及数据采集通道的数量来布置响应点，避免大量试 验的盲目性。工作台响应点主要布置在其上表面的四个顶点处；基于响应点不布置在对称面的原则，床身 响应点则分布在其右侧面的四个顶点以及前面上端的两顶点处；立柱响应点主要分布在右侧面四角点和顶 部两点；考虑到主轴箱属于薄壁结构，它的响应点则布置在下端主轴的两个圆柱面上，空间呈90°夹角来 布置两测点。</span></span></p> <p class="91" style="margin-bottom:3.15pt;text-indent:0cm;line-height:10.0pt; mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="91pt"><span style="font-family: SimSun;">1.2</span></span><span class="91pt">测试系统</span></span></p> <p class="91" style="margin-bottom:3.15pt;text-indent:0cm;line-height:10.0pt; mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><br clear="ALL" /> <span class="40">采用丹麦</span><span class="4TimesNewRoman0"><span lang="EN-US">B</span></span><span class="40"><span style="font-family: SimSun;">&</span></span><span class="4TimesNewRoman0"><span lang="EN-US">K</span></span><span class="40">测试系统开展模态测试。整个模态测试分析系统如图1所示，主要由激励系统、数据 采集系统、数据处理系统三部分组成。</span></span></p> <p class="940" style="margin-bottom:6.4pt;line-height:10.0pt;mso-line-height-rule: exactly;mso-pagination:lines-together;page-break-after:avoid;background:transparent"><a name="bookmark4"><span style="font-size: small;"><span class="94">图1模态测试分析系统</span></span></a></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.6pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">试验中的激励系统通过</span><span class="40"><span style="font-family: SimSun;">8206-002</span></span><span class="40">型脉冲力锤(图</span><span class="40"><span style="font-family: SimSun;">2</span></span><span class="4TimesNewRoman0"><span lang="EN-US">a</span></span><span class="40"><span style="font-family: SimSun;">)</span></span><span class="40">施加激励，该型号的力锤承受的压力范围为 0</span><span class="40"><span style="font-family: PMingLiU;">?</span></span><span class="40"><span style="font-family: SimSun;">2200</span></span><span class="4TimesNewRoman0"><span lang="EN-US">N</span></span><span class="40"><span lang="EN-US">。</span></span><span class="40">根据测试需求，力锤可选用不同的锤头，力锤锤头匹配数据表如表1所示。由于</span><span class="4TimesNewRoman0"><span lang="EN-US">KVC</span></span><span class="40"><span style="font-family: SimSun;">800</span></span><span class="40">立式 加工中心主轴的工作转频范围为</span><span class="40"><span style="font-family: SimSun;">10~6000</span></span><span class="4TimesNewRoman0"><span lang="EN-US">r</span></span><span class="40"><span style="font-family: SimSun;">/</span></span><span class="4TimesNewRoman0"><span lang="EN-US">min</span></span><span class="40"><span lang="EN-US">，</span></span><span class="40">试验过程中关注</span><span class="40"><span style="font-family: SimSun;">100</span></span><span class="4TimesNewRoman0"><span lang="EN-US">Hz</span></span><span class="40">以内的固有频率，因而选用橡胶锤 头，并且安装配重，以产生比较大的冲击力从而激发出更多模态，使能量分散在比较宽频率范围内</span></span><span class="40"><a href="file:///E:/%E7%BD%91%E7%AB%99%E5%8D%95%E7%8B%AC%E8%B5%84%E6%96%99/%E5%9B%BE%E4%B9%A6/2015%E6%96%B0%E5%9B%BE%E4%B9%A6/%E6%9C%9F%E5%88%8Adoc/KVC800%E7%AB%8B%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83%E5%8A%A8%E6%80%81%E7%89%B9%E6%80%A7%E7%9A%84%E8%AF%95%E9%AA%8C%E7%A0%94%E7%A9%B6_%E8%92%8B%E7%8E%B2%E8%8E%89.doc#_ftn2" name="_ftnref2" title=""><span style="font-size: small;"><sup><!--[if !supportFootnotes]--><span class="40"><sup><span style="color: black;">[2]</span></sup></span><!--[endif]--></sup></span></a></span><span style="font-size: small;"><span class="40">。</span></span></p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="296" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="a2" align="left" style="text-indent: 0cm; line-height: 10pt; background: transparent;"><span style="font-size: small;"><span class="1pt">表1力锤锤头匹配数据表</span></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:19.9pt;mso-height-rule: exactly"> <td width="83" style="width: 62.15pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 19.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:16.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">锤头材质</span></span></p> </td> <td width="70" style="width: 52.8pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 19.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">频率范围</span></span></p> </td> <td width="66" style="width: 49.2pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 19.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:7.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">脉冲时间</span></span></p> </td> <td width="77" style="width: 58.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 19.9pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">压力范围</span></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:16.3pt;mso-height-rule:exactly"> <td width="83" valign="bottom" style="width: 62.15pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.3pt; 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;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">铁</span></span></p> </td> <td width="70" valign="bottom" style="width: 52.8pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.3pt; 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="right" style="margin-right:9.0pt;text-align:right; text-indent:0cm;line-height:9.5pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" align="right" style="margin-right:9.0pt;text-align:right; text-indent:0cm;line-height:9.5pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:222.25pt;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="20pt">0</span><span class="20pt"><span style="font-family: PMingLiU;">?</span></span><span class="20pt"><span style="font-family: SimSun;">7</span></span><span class="2TimesNewRoman0"><span lang="EN-US">kHz</span></span></p> </span></td> <td width="66" valign="bottom" style="width: 49.2pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">0.20</span></span><span class="2TimesNewRoman0"><span lang="EN-US">ms</span></span></p> </span></td> <td width="77" valign="bottom" style="width: 58.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">500~5000</span></span><span class="2TimesNewRoman0"><span lang="EN-US">N</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:2;height:16.1pt;mso-height-rule:exactly"> <td width="83" valign="bottom" style="width: 62.15pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">塑料</span></span></p> </td> <td width="70" valign="bottom" style="width: 52.8pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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="right" style="margin-right:9.0pt;text-align:right; text-indent:0cm;line-height:9.5pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" align="right" style="margin-right:9.0pt;text-align:right; text-indent:0cm;line-height:9.5pt;mso-line-height-rule:exactly;background: transparent;mso-element:frame;mso-element-frame-width:222.25pt;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="20pt">0</span><span class="20pt"><span style="font-family: PMingLiU;">?</span></span><span class="20pt"><span style="font-family: SimSun;">2</span></span><span class="2TimesNewRoman0"><span lang="EN-US">kHz</span></span></p> </span></td> <td width="66" valign="bottom" style="width: 49.2pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">0.57</span></span><span class="2TimesNewRoman0"><span lang="EN-US">ms</span></span></p> </span></td> <td width="77" valign="bottom" style="width: 58.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">300~1000</span></span><span class="2TimesNewRoman0"><span lang="EN-US">N</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:3;mso-yfti-lastrow:yes;height:17.5pt;mso-height-rule: exactly"> <td width="83" style="width: 62.15pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.5pt; 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;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:222.25pt;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 style="font-size: small;"><span class="20pt">橡胶</span></span></p> </td> <td width="70" style="width: 52.8pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt">0</span><span class="20pt"><span style="font-family: PMingLiU;">?</span></span><span class="20pt"><span style="font-family: SimSun;">500</span></span><span class="2TimesNewRoman0"><span lang="EN-US">Hz</span></span></p> </span></td> <td width="66" style="width: 49.2pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:13.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">2.7</span></span><span class="2TimesNewRoman0"><span lang="EN-US">ms</span></span></p> </span></td> <td width="77" style="width: 58.1pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.5pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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"> </p> <span style="font-size: small;"> <p class="22" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:222.25pt;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="20pt"><span style="font-family: SimSun;">100~700</span></span><span class="2TimesNewRoman0"><span lang="EN-US">N</span></span></p> </span></td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> </div> <p><span style="font-size: small;"> <!--[if !supportTextWrap]--><br /> </span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">为了获得各个方向的完整模态信息，每个响应点布置三个方向的加速度传感器，由自制底座将3个单 向传感器组合而成(如图</span><span class="40"><span style="font-family: SimSun;">2</span></span><span class="4TimesNewRoman0"><span lang="EN-US">b</span></span><span class="40"><span style="font-family: SimSun;">)</span></span><span class="40"><span lang="EN-US">。</span></span><span class="40">试验中由力传感器和加速度传感器测得信号经过丹麦</span><span class="4TimesNewRoman0"><span lang="EN-US">BK</span></span><span class="40">数据采集器(如图</span><span class="40"><span style="font-family: SimSun;">2</span></span><span class="4TimesNewRoman0"><span lang="EN-US">c</span></span><span class="40"><span style="font-family: SimSun;">) </span></span><span class="40">和</span><span class="4TimesNewRoman0"><span lang="EN-US">MTC</span></span><span class="40"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="4TimesNewRoman0"><span lang="EN-US">Hammer</span></span><span class="40">模态测试软件采集和储存，再由</span><span class="4TimesNewRoman0"><span lang="EN-US">Reflex</span></span><span class="40">模态分析软件进行模态分析。</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="91pt"><span style="font-family: SimSun;">1.3</span></span><span class="91pt">参数设置</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">测试过程中，首先设置好采集通道中的力锤激励力信号以及加速度响应信号，在软件中按比例建立好 加工中心各部件的简化模型，完成激励点、响应点位置和方向的选择。还需确定以下各参数来完成试验， 并确保试验质量。</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;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="40">分析频率</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">许多文献指出，机床的前几阶模态主要集中在低频阶段，且基本上决定了整机的动态特性<sup>[4-5]</sup>。影响加 工中心性能的频率范围主要是低频段，本文主要关注</span><span class="40"><span style="font-family: SimSun;">100</span></span><span class="4TimesNewRoman0"><span lang="EN-US">Hz</span></span><span class="40">以内的频段，故设定的分析频段为0</span><span class="40"><span style="font-family: PMingLiU;">?</span></span><span class="40"><span style="font-family: SimSun;">100</span></span><span class="4TimesNewRoman0"><span lang="EN-US">Hz</span></span><span class="40"><span lang="EN-US">。</span></span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;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="40">米样频率</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">根据采样定理，采样频率必须大于信号的最高分析频率的两倍，方可保证离散信号能惟一恢复到原连 续信号而不失真<sup>[6]</sup>，实际测试中常常将采样频率略为放大。本次测试采样频率为</span><span class="40"><span style="font-family: SimSun;">2048</span></span><span class="4TimesNewRoman0"><span lang="EN-US">Hz</span></span><span class="40"><span lang="EN-US">。</span></span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;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="40">平均次数</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">为了减少噪声干扰，提高频谱分析的精度，试验采用多次敲击，对采样数据进行平均化处理来计算频 响函数，试验中平均次数设置为5次。</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;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="40">力锤触发设置</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">设置合理的触发方式对于瞬态信号的捕获有很大的作用。根据表1所提供的力锤匹配数据，对应的添 加附加质量的橡胶锤头，激励力应设置在100</span><span class="40"><span style="font-family: PMingLiU;">?</span></span><span class="40"><span style="font-family: SimSun;">700</span></span><span class="4TimesNewRoman0"><span lang="EN-US">N</span></span><span class="40">之间，结合操作者力度的大小，以及试验中多次的试 敲，将</span><span class="40"><span style="font-family: SimSun;">120</span></span><span class="4TimesNewRoman0"><span lang="EN-US">N</span></span><span class="40">设置为其激励力阈值，当力锤敲击力大小超过</span><span class="40"><span style="font-family: SimSun;">120</span></span><span class="4TimesNewRoman0"><span lang="EN-US">N</span></span><span class="40">时产生激励力。</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><!--[if !supportLists]--><span style="font-family: SimSun;">5)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="40">窗函数选取</span></span></p> <p class="42" style="text-align:justify;text-justify:inter-ideograph;text-indent: 23.0pt;line-height:15.35pt;mso-line-height-rule:exactly;background:transparent"><span style="font-size: small;"><span class="40">分析处理响应信号时需要截断信号，往往易带来截断误差，截取的有限长信号不能完全反应出原信号 的频率特性，所以需要添加窗函数来减小误差<sup>[7]</sup>。由于力的持续时间短，在其后的剩余时间，任何噪声都 是不希望的，所以激励信号加力窗以减小噪声的影响，响应信号加指数窗以减小泄漏误差。</span></span></p> <p class="91" style="margin-top:0cm;margin-right:0cm;margin-bottom:8.3pt; margin-left:38.0pt;text-indent:0cm;line-height:10.0pt;mso-line-height-rule: exactly;background:transparent"><span style="font-size: small;"><span class="91pt"><span style="font-family: SimSun;">1.4</span></span><span class="91pt">结果分析</span></span></p> <p><span style="font-size: small;"><span class="40"> 采用频域总体曲线拟合法对模态参数进行自动识别<sup>[8-9]</sup>，加工中心工作台、床身、立柱以及主轴箱四个 部分的模态分析结果见图3。</span></span></p> <p><span style="font-size: small;"> 2 基于升速过程瀑布图的动态特性分析及对比验证 </span></p> <p><span style="font-size: small;"> 手动开启数控加工中心至最高转速，试验过程中主轴最高转速设置为5500r/min，利用B&K测试系统的 Labshop数据采集与分析模块对整个升速过程的振动信号予以记录，并进行了瀑布图分析，瀑布图中的突变点反映了加工中心的各阶固有频率[10]。在加工中心工作台、床身、立柱以及主轴箱分别测得的振动信号分析所得瀑布图，如图4所示。 </span></p> <p> </p> <p class="40" align="left" style="margin-left: 79pt; line-height: 23.3pt; background: transparent;"><span style="font-size: small;"><span class="4">从模态图与瀑布图中筛选相互对应的模态频率并加以对比，如表2所示。</span></span></p> <div> <table cellspacing="0" cellpadding="0" hspace="0" vspace="0" width="284" align="center"> <tbody> <tr> <td valign="top" align="left" style="padding-top:0cm;padding-right:0cm; padding-bottom:0cm;padding-left:0cm"> <p class="180" style="background:transparent;mso-element:frame;mso-element-frame-width: 213.1pt;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"> </p> <span style="font-size: small;"> <p class="180" style="background:transparent;mso-element:frame;mso-element-frame-width: 213.1pt;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="18">表2模态试验与升速瀑布图所得模态频率对比(</span><span class="1895pt">单位：</span><span class="18TimesNewRoman"><span lang="EN-US">Hz</span></span><span class="18"><span style="font-family: SimSun;">)</span></span></p> </span> <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:17.3pt;mso-height-rule: exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 17.3pt; 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 style="font-size: small;"><span lang="EN-US" style="color: windowtext;"> </span></span></p> </td> <td width="70" valign="bottom" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin-left:8.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">模态试验</span></span></p> </td> <td width="83" valign="bottom" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">升速瀑布图</span></span></p> </td> <td width="76" valign="bottom" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 17.3pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin-left:9.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">误差率/°%</span></span></p> </td> </tr> <tr style="mso-yfti-irow:1;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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 style="font-size: small;"><span lang="EN-US" style="color: windowtext;"> </span></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">46.43</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">50</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">7.14</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:2;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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="20pt">丄坐口 </span><span class="20pt"><sup><span style="font-family: SimSun;">_</span></sup></span></p> </span></td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">67.25</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">64</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">5.08</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:3;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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 style="font-size: small;"><span lang="EN-US" style="color: windowtext;"> </span></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">52.62</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">50</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">5.24</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:4;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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="20pt">床身 </span><span class="20pt"><span style="font-family: SimSun;">"</span></span></p> </span></td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">60.88</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">64</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">4.88</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:5;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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 style="font-size: small;"><span lang="EN-US" style="color: windowtext;"> </span></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">48.80</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">50</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">2.4</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:6;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="right" style="text-align:right;text-indent:0cm;line-height: 9.5pt;mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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="20pt">立仕 </span><span class="20pt"><span style="font-family: SimSun;">■</span></span></p> </span></td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">67.36</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">64</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">5.25</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:7;height:16.1pt;mso-height-rule:exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; 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 style="font-size: small;"><span lang="EN-US" style="color: windowtext;"> </span></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">47.69</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">50</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none none; border-top-color: windowtext; border-top-width: 1pt; padding: 0cm; height: 16.1pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">4.42</span></span></p> </span></td> </tr> <tr style="mso-yfti-irow:8;mso-yfti-lastrow:yes;height:17.75pt;mso-height-rule: exactly"> <td width="56" valign="top" style="width: 41.75pt; border-style: none none solid; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" style="margin-left:8.0pt;text-indent:0cm;line-height:9.5pt; mso-line-height-rule:exactly;background:transparent;mso-element:frame; mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">土轴相</span></span></p> </td> <td width="70" style="width: 52.3pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">62.92</span></span></p> </span></td> <td width="83" style="width: 61.9pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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 style="font-size: small;"><span class="20pt">64</span></span></p> </td> <td width="76" style="width: 57.1pt; border-style: solid none; border-top-color: windowtext; border-top-width: 1pt; border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm; height: 17.75pt; background-image: initial; background-attachment: initial; background-size: initial; background-origin: initial; background-clip: initial; background-position: initial; background-repeat: initial;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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"> </p> <span style="font-size: small;"> <p class="20" align="center" style="text-align:center;text-indent:0cm; line-height:9.5pt;mso-line-height-rule:exactly;background:transparent; mso-element:frame;mso-element-frame-width:213.1pt;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="20pt"><span style="font-family: SimSun;">1.69</span></span></p> </span></td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> <p><span style="font-size: small;"><span class="1pt" style="line-height: 20.8000011444092px;">由表2可知，</span><span class="1pt" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">50</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">Hz</span></span><span class="1pt" style="line-height: 20.8000011444092px;">和</span><span class="1pt" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">64</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">Hz</span></span><span class="a" style="line-height: 20.8000011444092px;">为整机的固有模态，在实际加工工件过程中，应尽量避免</span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">50</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">Hz</span></span><span class="a" style="line-height: 20.8000011444092px;">及</span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">64</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">Hz </span></span><span class="a" style="line-height: 20.8000011444092px;">的工作转频，即</span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">3000</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">r</span></span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">/</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">min</span></span><span class="a" style="line-height: 20.8000011444092px;">和</span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">3840</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">r</span></span><span class="a" style="line-height: 20.8000011444092px;"><span style="font-family: SimSun;">/</span></span><span class="TimesNewRoman" style="line-height: 20.8000011444092px;"><span lang="EN-US">min</span></span><span class="a" style="line-height: 20.8000011444092px;">的主轴工作转速。</span></span></p> <p><a name="bookmark6" style="line-height: 16pt; background-color: transparent;"><span style="font-size: small;"><span class="4">3结论</span></span></a></p> <p><a name="bookmark6" style="line-height: 16pt; background-color: transparent;"></a><span style="font-size: small;"><span style="line-height: 15.85pt; text-align: right; text-indent: 0cm; font-family: SimSun; background-color: transparent;">1)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><span class="41pt" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;">利用丹麦</span><span class="4TimesNewRoman" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">B</span></span><span class="40" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;"><span style="font-family: SimSun;">&</span></span><span class="4TimesNewRoman" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">K</span></span><span class="40" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;">测试系统，采用单点激励多点响应，对</span><span class="4TimesNewRoman" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;"><span lang="EN-US">KVC</span></span><span class="40" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;"><span style="font-family: SimSun;">800</span></span><span class="40" style="line-height: 15.85pt; text-align: right; text-indent: 0cm; background-color: transparent;">立式加工中心主要部件工作台、床 身、立柱和主轴箱开展了模态测试，从试验方案、测试系统、参数设置和结果分析几方面探讨了试验过程</span><span style="font-family: 宋体; letter-spacing: 0.5pt; line-height: 9.5pt; text-align: center; text-indent: 0cm; background-color: transparent;">的开展，获取了各主要部件的模态参数。</span></span></p> <p><span style="font-size: small;"><span style="line-height: 15.35pt; text-indent: 21pt; font-family: SimSun; background-color: transparent;">2)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">利用</span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">B</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">&</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">K</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">测试系统对加工中心整个升速过程的振动信号予以记录，并进行了瀑布图分析，并从中 获取模态信息，与试验模态测试结果进行了对比验证。</span></span></p> <p><span style="font-size: small;"><span style="line-height: 15.35pt; text-indent: 21pt; font-family: SimSun; background-color: transparent;">3)<span style="font-stretch: normal; line-height: normal; font-family: 'Times New Roman';"> </span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">通过模态测试分析与升速过程瀑布图分析，获知</span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">50</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">Hz</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">和</span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">64</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">Hz</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">为加工中心整机固有频率，实际使 用过程中应避开</span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">3000</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">r</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">/</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">min</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">和</span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">3840</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">r</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span style="font-family: SimSun;">/</span></span><span class="4TimesNewRoman" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;"><span lang="EN-US">min</span></span><span class="40" style="line-height: 15.35pt; text-indent: 21pt; background-color: transparent;">的主轴工作转速，为加工中心的优化运行提供了可靠依据。</span></span></p> </div> <p class="MsoNormal"><span style="font-size:9.0pt;font-family:宋体;mso-ascii-font-family: "Times New 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