模态分析实验指导书

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1、模态分析实验指导书♦问题描述：这是一个飞机机翼的简单模态分析。机翼的截面是市直线和样条曲线定义的。机翼的一端固定在机身上，另一端自由。问题的目标就是求解机翼的固有频率和振动模态。机翼的尺寸参数如上图所示。机翼材料为低密度聚乙烯，弹性模量38x10?psi,泊松比0.3,密度8.3E-5lbrsec2/in40♦几何建模：第一步：读入儿何模型1.UtilityMenu>File>ReadInputfrom・・・2.Filename:wing,inpProgramFilesAnsysIncV90ANSYSdatamodelswing.inp3.[OK]♦定义材料:第二步：设置

2、分析类型1.2.3.MainMenu>Preferences[OK](select)uStructural”第三步：定义材料特性参数1.MainMenu>Preprocessor>MaterialProps>MaterialModels2.(doubleclick)uStructural",then“Linear",then“Elastic”,thenuIsotropicn3.“EX”二380004.“PRXY”=0.35.[OK]6.(doubleclick)“Density”7.“DENS”=8.3e-5&[OK]9.Material>Exit♦划分网格:第四步：泄义单元类型1.M

3、ainMenu>Preprocessor>ElementType>Add/Edit/Delete2.[Add...]3."StrueturalSolid”(leftcolumn)4.uQuad4node42”(rightcolumn)5.[Apply]tochoosetheQuad4node(PLANE42)6.uStructuralSolid”(leftcolumn)7."Brick8node45”(rightcolumn)&[OK]tochoosetheBrick8node(S0L1D45)9.[Close]10.Toolbar:SAVE_DB笫五步：划分网格1.MainMenu>

4、Preprocessor>Meshing>MeshTool2."SizeControlsGlobal"=[Set]3.aElementedgelength”=0.254.[OK]5.[Mesh]6.[PickAll]7.[Close]Warning・1.[Close]Meshtool2.Toolbar:SAVE_DB第六步：拉伸出划分网格后的实体1.MainMenu>Preprocessor>Modeling>Operate>Extrude>ElemExtOpts2.(dropdown)"Elementtypenumberv=2SOLID453.“No.Elemdivs”二104.[O

5、K]5.MainMenu>Preprocessor>Modeling>Operate>Extrude>Areas>ByXYZOffset6.[PickAll]7.“Offsetsforextrusion=0,0,108.[OK]9.[Close]Warning.10.UtilityMenu>PlotCtrls>Pan,Zoom,Rotate11.[Iso]12.[Close]13.Toolbar:SAVE_DB♦施加载荷：第七步：不选择二维单元1.UtilityMenu>Select>Entities2.(firstdropdown)"Elements”3.(seconddropdow

6、n)"ByAttributes"4.(check)“Elemtypenum”5.“Min,Max,Inc”二16.(check)"Unselect/'7.[Apply]第八步：给模型施加约束1.(firstdropdown)"Nodes”2.(seconddropdown)"ByLocation”3.(check)"Zcoordinates”4.“Min,Max”=05.(check)“FromFull”6.[Apply]7.MainMenu>Preprocessor>Loads>DefineLoads>Apply>Structural>Displacement>OnNodes8.[P

7、ickAll]topickallselectednodes・9.“DOFstobeconstrained=AllDOF10.[OK]1.(seconddropdown)"ByNum/Pick"2.[SeleAll]toinrniediatelyselectallnodesfromentiredatabase.3.[Cancel]toclosedialogbox.4.Toolbar:SAVE_DB♦求解：第九步：设定分析类型和选项1.MainMe