模态分析实验指导书.doc

《模态分析实验指导书.doc》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

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。机翼的截面是由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>F订e>ReadInputfrom・・・2.Filename:wing,inpProgramFi1esAnsysTncV90ANSYSdatamodel

2、swing.inp3.[OK]♦定义材料:第二步：设置分析类型1.2.3.MainMenu>Preferences[OK](select)^Structural"第三步：定义材料特性参数1.MainMenu>Preprocessor>MaterialProps>MaterialModels2.(doubleclick)uStructural,thenuLinear,then“Elastic”then"IsotTopic”3.“EX”二380004.“PRXY”=0.35.[OK]6.(doubleclick)“Density”7

3、.“DENS”二8.3e-58.[OK]9.Material>Exit♦划分网格:第四步：定义单元类型1.MainMenu>Preprocessor>ElementType>Add/Edit/Delete2.[Add...]3.^StructuralSolid,,(leftcolumn)4.Quad4node42”(rightcolumn)5.[Apply]tochoosetheQuad4node(PLANE42)6.uStructuralSolid”(leftcolumn)7."Brick8node45”(rightcolumn

4、)8.[OK]tochoosetheBrick8node(SOLID45)9.[Close]10.Toolbar:SAVE_DB第五步：划分网格1.MainMenu>Preprocessor>Meshing>MeshTool2."SizeControlsGlobalv=[Set]3.“Elementedgelength”=0.254.[OK]1.[Mesh]2.[PickAll]3.[Close]Warning.4.[Close]Meshtool5.Toolbar:SAVEDB第六步：拉伸出划分网格后的实体1・MainMenu>P

5、reprocessor>Modeling>Operate>Extrude>ElemExtOpts2.(dropdown)"Elementtypenumbern二2S0LTD453."No.Elemdivs”=104.[OK]5.MainMenu>Preprocessor>Modeling>Operate>Extrude>Areas>ByXYZOffset6.[PickAll]7."Offsetsforextrusion,^=0,0,108.[OK]9.[Close]Warning.10.UtilityMenu>PlotCtrls>

6、Pan,Zoom,Rotate11.[Tso]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.(seconddropdown)“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.(secondd

7、ropdown)“ByLocation”3.(check)"Zcoordi门8tes”4.“Min,Max”=05.(check)"FromFull”6.[Apply]7.MainMenu>Preprocessor>Loads>DefineLoads>Apply>Structural>Displacement>OnNodes8.[PickAll]topickallselectednodes・9."DOFstobeconstrainedn=AllDOF10.[OK]1.(seconddropdown)"ByNum/Pickn2.[S

8、eleAll]toimmediatelyselectallnodesfromentiredatabase.3.[Cancel]toclosedialogbox.4.Toolbar:SAVE_DB♦求解：第九步：设定分析类型和选项1.MainMenu