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bodyBgs[3] = "/images/banner/s4.jpg"; bodyBgs[4] = "/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>试验设计及激励及数据采集、边界条件的选择<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>4.2试验方案<br /> 4.2.1试验设计<br /> 首先建立VMC1060立式加工中心的几何模型，依靠工程经验对该机床进行 均匀安排点位。尽管这样理论化的布点在实验过程中会额外增加大量成本和时间， 但是这种低效率的方法并非一无是处，它可以有效避免了露点从而导致后面模态 分析结论出现偏差，所以在提高模态造型可辨识性方面具有长处。在本试验中对 VMC1060立式加工中心采取上述布置点位方法能够非常确信的获得真实的前几 阶模态，而正是这儿节低阶模态才是我们所需要的。<br /> 整个数控机床共布置302个测点，测量自由度为302x3=906。激励点依据工 程经验选择在主轴上，数量为1个，激励自由度为2个正交方向（图4.4)，总 FRF=906><2=1812(图 4.5)。</p> <p><br /> 4.2.2激励及数据采集<br /> 确定试验分析频段前先进行预试验，发现机床结构的主要模态主要集中在 1000Hz以内，高阶模态对机床结构的动态特性影响很小，几乎可以忽略。通过经 验可以判断不同重量的机床前几阶段模态的模态频率范围，也这能指导我们进行 中心频率和采样频率的选择[501。大量工程实践经验证明机床自重和其共振频率有 相对关系，在查得VMC1060立式加工中心重约5吨后我们也就知道了前几阶模 态应该在250Hz以内，最后我们选择1024Hz作为中心频率，这样既可减少数据 采集和分析的工作量，又可提高模态参数辨识的精度。为了避免发生频率混叠， 按照采样定理，信号的采集频率不得低于欲分析最高频率的2倍。对于响应信号， 按照不发生频率混叠的要求，以2048Hz的采样频率进行采集；对于锤击产生的 脉冲力，同样采用2048Hz的高采样频率。同时，力信号加力窗，加速度信号加 Exponentia丨窗，以减少泄漏误差。同时对响应信号进行多次采集，并进行平均处 理，以减少噪音的干扰。本次试验采取3次平均。</p> <p>4.2.3边界条件的选择<br /> 由于机床总处于一定的边界约束状态，而对于同一台机床在不同的约束及边 界条件下，会具有不同的模态参数及特性。考虑到机床在实际的工作状态下的安 装条件，因此，合理的选择机床在试验状态下的约束及边界I：件具有重要意义。，机床底座直接放置在刚性铸铁垫块上面进行，为自由支撑，其约束 近似于机床的实际工作状态下的约束及边界条件。<br /> 在试验前，先调整机床部件的位置，使其处于常用的工作位置。<br /> </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“</span><span lang="EN-US" style="font-size:9.0pt">VMC1060</span><span style="font-size:9.0pt; font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman"">型立式加工中心试验模态分析”，因为编辑困难导致有些函数、表格、图片、内容无法显示，有需要者可以在网络中查找相关文章！本文由伯特利数控整理发表文章均来自网络仅供学习参考，转载请注明！</span><span lang="EN-US" style="font-size:9.0pt"> <o:p></o:p></span></p> <p> </p></div> <div class="blank30"></div> <!-- tag --> <div class="blank10"></div> 标签： <a href='/index.php?case=tag&act=show&tag=1060%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>1060加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>加工中心</a> <a href='/index.php?case=tag&act=show&tag=%E7%AB%8B%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>立式加工中心</a> <!-- 分类 --> <div class="blank10"></div> 分类： <a href='/bethel/type/jnc/type-1.html' 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