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SimSun;">2.1</span></span><span class="7" style="line-height: 29.3pt; background-color: transparent;">单元的选用与划分</span></p> <p class="141" align="left" style="margin-bottom: 0.0001pt; line-height: 29.3pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="14"><span style="font-family: SimSun;">2.1.1</span></span></st1:chsdate><span class="14">结构有限元建模的单元选择</span></p> <p class="141" style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:29.0pt;background:transparent"><span class="14">机械结构件大都较复杂，尤其是床身、立柱等大中型结构件，进行有限元分析 时，简单地使用某一类单元进行离散模拟，难以真实反映实际结构的力学特性。针对 不同结构或同一结构不同区域的几何、载荷特征釆用合适的单元模拟可使有限元模型 更切实际，如结构件的壁板用壳单元模拟，加强肋、丝杠等用梁单元模拟，轴承座等 不规则实体可用体单元模拟。为此，复杂结构的有限元模型通常是混合单元模型。</span></p> <p class="141" style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:29.0pt;background:transparent"><span class="14">机械结构离散时常用的体单元有四面体单元</span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">solid</span></span><span class="14"><span style="font-family: SimSun;">92</span></span><span class="14"><span lang="EN-US">、</span></span><span class="14">六面体单元</span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">sdid</span></span><span class="14"><span style="font-family: SimSun;">45</span></span><span class="14">或 </span><span class="14TimesNewRoman"><sub><span lang="EN-US" style="font-size: 12pt;">S</span></sub></span><span class="14"><sub><span lang="EN-US">〇</span></sub></span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">lid</span></span><span class="14"><span style="font-family: SimSun;">95,</span></span><span class="14">而壳单元一般选用低阶的</span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">shell</span></span><span class="14"><span style="font-family: SimSun;">63</span></span><span class="14">即可满足计算精度要求。使用四面体单元进 行自由网格划分可通过软件自动完成，效率高，但离散后节点数量多，计算规模大、 时间长。四面体单元应用于复杂结构时，为避免网格划分失败，往往需要提髙单元密 度或对结构几何特征作较大的简化。六面体单元计算精度髙，但应用于几何特征复杂 的结构件时，网格划分繁琐、难度高，需耗费大量的时间。壳单元形态容易控制，网 格质量相对较高，应用于模拟床身等机床结构件的壁板可大幅减小有限元模型的节点 数量，大大缩小计算规模，降低对计算机性能的要求，提髙计算效率。但壳单元的使 用对结构几何尺寸有一定的要求，且使用壳单元模拟偏向于厚壳的实体，计算精度不 如体单元模型。实际应用时，需要结合分析对象的特点，灵活选择其中的若干种建立 结构的混合单元模型。</span></p> <p class="141" align="left" style="margin-bottom: 4.4pt; line-height: 12pt; background: transparent;"><st1:chsdate year="1899" month="12" day="30" islunardate="False" isrocdate="False" w:st="on"><span class="14"><span style="font-family: SimSun;">2.1.2</span></span></st1:chsdate><span class="14">壳单元使用要求和划分方法</span></p> <p class="141" style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:29.0pt;background:transparent"><span class="14">应用壳单元模拟结构，要求使用壳单元的区域满足厚度尺寸远小于平面长度尺 寸。但对于单个壳单元，则无此限制，在较精细的网格中，可能包含厚度尺寸大于平 面内尺寸的壳单元。文献</span><span class="14"><span style="font-family: SimSun;">[17]</span></span><span class="14">指出，厚度尺寸表示为</span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">f</span></span><span class="14"><span lang="EN-US">，</span></span><span class="14">平面内尺寸表示为6,薄板的 "办值的范围应满足：</span></p> <p class="141" style="margin-bottom:0cm;margin-bottom:.0001pt;text-align:justify; text-justify:inter-ideograph;text-indent:29.0pt;line-height:22.8pt;mso-line-height-rule: exactly;tab-stops:451.65pt;background:transparent"><span class="14"><span style="font-family: SimSun;">(1/100 </span></span><span class="14"><span style="font-family: PMingLiU;">?</span></span><span class="14"><span style="font-family: SimSun;">1/80)</span></span><span class="14">以</span><span class="14"><span style="font-family: SimSun;">/6</span></span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">S</span></span><span class="14"><span style="font-family: SimSun;">(</span></span><span class="14TimesNewRoman"><span lang="EN-US" style="font-size: 12pt;">l</span></span><span class="14"><span style="font-family: SimSun;">/8 </span></span><span class="14"><span style="font-family: PMingLiU;">?</span></span><span class="14"><span style="font-family: SimSun;">1/5) (2.1)</span></span></p> <p class="141" align="left" style="margin-bottom: 0.0001pt; line-height: 22.8pt; background: transparent;"><span class="14">在此范围之外，值大的称为厚板，小的称为薄膜。</span></p> <p class="141" align="left" style="margin-bottom: 0.0001pt; text-indent: 29pt; background: transparent;"><span class="14">一般厚度尺寸/小于典型整体结构尺寸的1/10,就可以用壳单元进行模拟。其中， 典型整体结构尺寸包括<sup>[18]</sup>:</span></p> <p class="141" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:34.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:0cm;mso-list:l0 level1 lfo1;tab-stops:52.0pt;background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">1)<span style="font-stretch: normal; font-size: 7pt; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="14">支撑点之间的距离；</span></p> <p class="141" style="margin-top:0cm;margin-right:0cm;margin-bottom:0cm; margin-left:34.0pt;margin-bottom:.0001pt;text-align:justify;text-justify:inter-ideograph; text-indent:0cm;mso-list:l0 level1 lfo1;tab-stops:52.95pt;background:transparent"><!--[if !supportLists]--><span style="font-size: 12pt; font-family: SimSun;">2)<span style="font-stretch: normal; font-size: 7pt; font-family: 'Times New Roman';"> </span></span><!--[endif]--><span class="14">加强件之间的距离或截面厚度有很大变化部分之间的距离；</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:20.9pt;mso-line-height-rule:exactly;mso-list:l0 level1 lfo1; tab-stops:45.7pt;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">曲率半径；</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:20.9pt;mso-line-height-rule:exactly;mso-list:l0 level1 lfo1; tab-stops:46.2pt;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">所关注的最高阶振动模态的波长。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"><span class="2">使用壳单元模拟板壳实体，可先提取实体的中面，然后在中面上划分壳单元，并 通过设置壳单元的实常数模拟实体的厚度。如有需要，可通过指定一个偏置量使中面 偏离中间位置，如图</span><span class="2"><span style="font-family: SimSun;">2.1</span></span><span class="2">所示。</span></p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:20.9pt;mso-line-height-rule:exactly;background:transparent"> </p> <p class="21" style="margin:0cm;margin-bottom:.0001pt;text-indent:28.0pt; line-height:20.9pt;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"">卧式加工中心关键结构件结构分析与动态优化”，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 href='/index.php?case=tag&act=show&tag=%E5%8D%A7%E5%BC%8F%E5%8A%A0%E5%B7%A5%E4%B8%AD%E5%BF%83' target='_blank'>卧式加工中心</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 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<p>本文以组合式六角亭模型为实例，分析工艺难点与加工可行性，指出该模型的加工难点是模型形状不规则和整体刚性差，并通过设计新的工艺方案解决加工难点，完成了模型整体的加工。新的加工工艺有助于提高加工效率和精度，为五轴数控加工提供了一个典型案例，对于五轴加工中心数控加工也具有指导作用和重要… <a href="/bethel/5-aix/show-2966.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="自适应控制方法在混联五轴加工中心中的应用" href="/bethel/5-aix/show-2965.html" target="_blank">自适应控制方法在混联五轴加工中心中的应用</a></h4> <p>宇匠数控 备注：为保证文章的完整度，本文核心内容由PDF格式显示，如未有显示请刷新或转换浏览器尝试，手机浏览可能无法正常使用！本文摘要：通过对混联五轴加工中心自适应深度学习控制方法的 研 究，可 知 此 方 法 的 创 新 之 处 在 于：１）建 立 了 机 床 的 运 动 学 … <a href="/bethel/5-aix/show-2965.html" target="_blank">[了解更多]</a></p> </div> <div class="news-list list-border list-border-w"> <div class="list-date"> <span>05</span> <p>2024-11</p> </div> <h4><a title="五轴加工中心和五轴钻攻中心在机测量探头补偿" href="/bethel/5-aix/show-2959.html" target="_blank">五轴加工中心和五轴钻攻中心在机测量探头补</a></h4> 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