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的影响，因此，在考虑结合面特性的情况下，建立准确的结合面等效模型是建立正确的 有限元模型最为重要的前提。该加工中心的结合面类型主要包括固定结合面和滚动结合 面。固定结合面主要存在床身和立柱之间、导轨滑块和工作台立柱及立滑板之间、螺母 座和丝杠螺母以及螺母座和工作台立滑板主轴箱之间。滚动结合面主要存在导轨和导轨 滑块、滚珠丝杠和丝杠螺母、轴承内圈和轴承外圈之间。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:25.0pt;line-height:20.65pt; mso-line-height-rule:exactly;background:transparent"><span class="2">最常用的结合面建模方法是用等效结合点和弹簧阻尼单元</span><span class="2TimesNewRoman"><span lang="EN-US">MATRIX</span></span><span class="2"><span style="font-family: SimSun;">27</span></span><span class="2">来描述结合 面的接触面之间的连接关系。基本步骤是：</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:31.0pt;line-height:20.65pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:66.7pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(1)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">建立硬点。硬点</span><span class="2TimesNewRoman"><span lang="EN-US">(Hard</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="2TimesNewRoman"><span lang="EN-US">point</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">是一种特殊的关键点</span><span class="2TimesNewRoman"><span style="font-family: 宋体;">（</span></span><span class="2TimesNewRoman"><span lang="EN-US">Key</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="2TimesNewRoman"><span lang="EN-US">point</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">，它不会改变 模型任何的几何和拓扑结构，可以用硬点在模型的线和面上的任意点施加载荷，硬点的 位置即等效结合点的位置，硬点具体的坐标可以在三维模型中找到。本文采用 </span><span class="2TimesNewRoman"><span lang="EN-US">HyperMesh</span></span><span class="2">划分网格，所以在几何清理之后划分网格之前在相应位置建立节点</span><span class="2TimesNewRoman"><span style="font-family: 宋体;">（</span></span><span class="2TimesNewRoman"><span lang="EN-US">Node</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="2">)， 再在节点位置建立硬点</span><span class="2">（</span><span class="2TimesNewRoman"><span lang="EN-US">HardPoint</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">，</span><span class="2">这是由于该软件没有直接在确定位置建立硬点的 功能，这样在划分网格时便会在硬点位置生成节点。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:31.0pt;line-height:20.65pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:66.35pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(2)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">划分网格。网格划分完成后，在相应的硬点位置会生成节点</span><span class="2">（</span><span class="2TimesNewRoman"><span lang="EN-US">Node</span></span><span class="2"><span style="font-family: SimSun;">)</span></span><span class="2">。需要 说明的是，在</span><span class="2TimesNewRoman"><span lang="EN-US">HyperMesh</span></span><span class="2">中划分网格后须将之前建立的节点全部删除，否则会导致导入 </span><span class="2TimesNewRoman"><span lang="EN-US">ANS</span></span><span class="2"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="2TimesNewRoman"><span lang="EN-US">YS</span></span><span class="2">后一个等效结合点的位置出现多个节点，这会给建立</span><span class="2TimesNewRoman"><span lang="EN-US">MATRIX</span></span><span class="2"><span style="font-family: SimSun;">27</span></span><span class="2">单元带来困难。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:31.0pt;line-height:20.65pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:66.7pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(3)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">建立弹簧阻尼单元。通过命令流的方式找到对应节点的节点号，连接对应的 两个节点就可建立一个</span><span class="2TimesNewRoman"><span lang="EN-US">MATRIX</span></span><span class="2"><span style="font-family: SimSun;">27</span></span><span class="2">弹簧阻尼单元，从而建立零件之间接触面的特性的 等效模型。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:31.0pt;line-height:20.65pt; mso-line-height-rule:exactly;mso-list:l0 level1 lfo1;tab-stops:66.45pt; background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">(4)<span style="font-stretch: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="2">定义实常数</span><span class="2Batang">。一</span><span class="2">般来讲，用来建立</span><span class="2TimesNewRoman"><span lang="EN-US">MATRIX</span></span><span class="2"><span style="font-family: SimSun;">27</span></span><span class="2">的连接点只有</span><span class="2TimesNewRoman">X</span><span class="2">、</span><span class="2TimesNewRoman"><span lang="EN-US">Y</span></span><span class="2">、</span><span class="2TimesNewRoman"><span lang="EN-US">Z</span></span><span class="2">三个 方向的平动自由度，所以只需设置</span><span class="2TimesNewRoman">X</span><span class="2">、</span><span class="2TimesNewRoman"><span lang="EN-US">Y</span></span><span class="2">、</span><span class="2TimesNewRoman"><span lang="EN-US">Z</span></span><span class="2">三个方向的连接刚度。矩阵中各元素的取</span></p> <p class="21" align="left" style="margin: 0cm 0cm 0.0001pt 10pt; line-height: 20.65pt; background: transparent;"><span class="2">值是：</span></p> <p class="130" style="margin-top:0cm;margin-right:0cm;margin-bottom:.9pt; margin-left:10.0pt;text-align:justify;text-justify:inter-ideograph;text-indent: 25.0pt;line-height:12.0pt;mso-line-height-rule:exactly;tab-stops:451.15pt; background:transparent"><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><span style="font-family: SimSun;">, </span></span><span class="130pt">= </span><span class="130pt"><span style="font-family: SimSun;">-</span></span><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><sub><span style="font-family: SimSun;">7</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> </span></span><span class="130pt">= </span><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><sub><span style="font-family: SimSun;">58</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> </span></span><span class="130pt">= </span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">K<sub>x</sub></span></span><span class="13TimesNewRoman3"><span lang="EN-US">-,</span></span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">c<sub>n</sub></span></span><span class="13TimesNewRoman3"><span lang="EN-US"> </span></span><span class="13TimesNewRoman3"><span lang="EN-US">=</span></span><span class="130pt"><span lang="EN-US"> </span></span><span class="130pt"><span style="font-family: SimSun;">-</span></span><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><sub><span style="font-family: SimSun;">I9</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> = </span></span><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><sub><span style="font-family: SimSun;">64</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> =</span></span><span class="130pt"><span lang="EN-US">：</span></span><span class="130pt"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">K<sub>y</sub></span></span><span class="13TimesNewRoman3"><span lang="EN-US">;</span></span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">C<sub>u</sub></span></span><span class="13TimesNewRoman3"><span lang="EN-US"> = -</span></span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="13TimesNewRoman2"><span lang="EN-US">,<sub>0</sub></span></span><span class="13TimesNewRoman3"><span lang="EN-US"> =</span></span><span class="130pt"><span lang="EN-US" style="font-family: SimSun;"> </span></span><span class="1312pt"><span lang="EN-US" style="font-size: 12pt;">C</span></span><span class="130pt"><sub><span style="font-family: SimSun;">69</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> = </span></span><span class="13TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">K</span></span><span class="13TimesNewRoman3"><sub><span lang="EN-US">:</span></sub></span><span class="130pt"><span style="font-family: SimSun;"> (2.1)</span></span></p> <p class="21" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:25.0pt;line-height:20.65pt; mso-line-height-rule:exactly;background:transparent"><span class="2">其余元素均设置为零。本文所用参数为通过实验法得到。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:25.0pt;line-height:20.65pt; mso-line-height-rule:exactly;background:transparent"><span class="2">需要注意的是，如果需更新实体的几何形状，比如是布尔操作或者是简化命令，任 何与实体相连的硬点将会被删除。因此，应该在实体模型创建完成以后再创建硬点。</span></p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:25.0pt;line-height:20.65pt; mso-line-height-rule:exactly;background:transparent"> </p> <p class="21" style="margin-top:0cm;margin-right:8.0pt;margin-bottom:0cm; margin-left:10.0pt;margin-bottom:.0001pt;text-indent:25.0pt;line-height:20.65pt; mso-line-height-rule:exactly;background:transparent"> </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">SGM50A</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"">卧式加工中心动态特性分析及关键部件的优化”，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 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