ANSYS模态分析实例3

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约束机翼的远端. 在 >Modal分支下，选择插入固 定端约束 >Insert>Fixed Supports. 如有必要，切换至面选择模式. 用左键选择端部的面.
1. 2. 在Details窗口中，单击“. 如有必要，使用 “Depth Picking” ，或者旋转模 型.
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Depth Picking
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当Modal分支处于准备状态，就可以进行 模态分析求解了. 经过最后的校核，所有的分支的符号必须 是下面的一种：
– – (准备好) (完成)
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12. 求解.
工具栏按钮: >Solve RMB >Solve may only solve this object and not evaluate objects elsewhere in the Outline Tree
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当模型被导入之后，在“Map of Analysis Types”中选择 “Modal” . 在“Number of Modes to Solve”输入5. 点击 OK 选择单位系统为:
“Units > U.S. Customary (in, lbm, lbf…)”
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当模态分析结果求解完毕，我们可以查看每一阶频 率的模态结果.
13. 在目录树中点击“Modal Solution”. 在“Tabular Data”左键单击顶部， 然后点击右键选择“Create Mode Shape Results”
– 这样就会自动插入所有求解模态的”Total Deformation”
• 校核模态分析设置 10. 在Details窗口中，确认提取5阶模态 11. 调整 “Output Controls” 为
1. 2. Calculate Stress- “Yes” Calculate Strain - “Yes”
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14. 查看每一阶模态的振型.
– 从Timeline window中可以动画显示振型(Play & Stop).
• 在动画进行过程中，同样可以进行模型的旋转.
– 注意 关注所求解的最高阶的模态: 注意:
计算最大频率 = _________________Hz.
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15. 有时从简单的云图，不能直观地显示模态振型 ，可以尝试一下矢量图显示模式。
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• 目的在于分析机翼模型的前5阶自然频率和振型.
Workshop 3 – 目的
• 假设机翼的一端完全被固定.
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• 机翼的材料为钛合金.
固定端
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点击 “求解”，结果将会进行更新 。
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1. 调整矢量标尺滑块 2. 动画显示矢量图
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如果时间允许的话，对网格尺寸进行细化(在 mesh分支下，选择>Insert>Sizing)， 然后求 解，比较计算结果.
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前处理的第一步是指定部件的材料 为钛合金. 在目录树中点击部件. 在 “Material”中,单击下拉菜单， 点击 >Import ，然后从 Workbench材料库中选择 “Titanium Alloy”.
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注意: 点击工具条的求解，将会求解所有 的分支。 如果我们希望只求解一个分支的话，点击 相应的分支进行求解即可。
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从“ WorkBench Project Launcher ”点击“ Simulation”。
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如果进入“Simulation” ，点击 >File>New
基于培训，可以点击 “No: do not save any items”
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点击 “ >Geometry>From File… ”，从相应文件夹中打开几何模 型文件 wing.iges
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