ANSYS循環(huán)對(duì)稱(chēng)結(jié)構(gòu)模態(tài)分析實(shí)例-簡(jiǎn)化齒輪的模態(tài)分析

1、循環(huán)對(duì)稱(chēng)結(jié)構(gòu)模態(tài)分析實(shí)例-簡(jiǎn)化齒輪的模態(tài)分析一、問(wèn)題描述該實(shí)例是對(duì)一個(gè)簡(jiǎn)化的齒輪模型的模態(tài)分析。齒輪在幾何形狀上具有循環(huán)對(duì)稱(chēng)的特征，因此在對(duì)其做模態(tài)分析時(shí)可以采用循環(huán)對(duì)稱(chēng)結(jié)構(gòu)模態(tài)分析的方法要求確定齒輪的低階固有頻率。已知的幾何數(shù)據(jù)參見(jiàn)分析過(guò)程中的定義，材料特性數(shù)據(jù)如下：楊氏模量=2X108N/m2泊松比=0.3密度=7.8X10-6N/m3二、GUI方式分析過(guò)程第1步：指定分析標(biāo)題1 .選取菜單途徑UtilityMenu>File>ChangeTitle2 .輸入文字“ModalanalysisofaGear”，然后單擊OK。第2步：定義單元類(lèi)型1.選取菜單途徑MainMenu&g

2、t;Preprocessor>ElementType>Add/Edit/Delete。ElementTypes對(duì)話(huà)框?qū)⒊霈F(xiàn)。2.單擊Add。LibraryofElementTypes對(duì)話(huà)框?qū)⒊霈F(xiàn)。3在左邊的滾動(dòng)框中單擊“StructuralShell”。4.在右邊的滾動(dòng)框中單擊“Elastic4node63”。5.單擊Apply。6在左邊的滾動(dòng)框中單擊“StructuralSolid”。7在右邊的滾動(dòng)框中單擊“Brick8node45”。8 .單擊OK。9 .單擊ElementTypes對(duì)話(huà)框中的Close按鈕。第3步：指定材料性能1 .選取菜單途徑MainMenu>Prep

3、rocessor>MaterialProps>-Constant-IsotropiGoIsotropicMaterialProperties對(duì)話(huà)框?qū)⒊霈F(xiàn)。2 .在OK上單擊以指定材料號(hào)為1。第二個(gè)對(duì)話(huà)框?qū)⒊霈F(xiàn)。3 .輸入EX為2E8。4 .輸入DENS為7.8e-6。5 .輸入NUXY為0.3。6 .單擊OK。第4步：定義建模所需的參數(shù)1.選取菜單途徑UtilityMenu>Parameters>ScalarParameters2在ScalarParameters對(duì)話(huà)木g中Selection區(qū)輸入以下參數(shù)定義等式，每個(gè)等式輸完后要擊回車(chē)鍵或單擊Accept表示確認(rèn)：r1

4、=30r2=r1+10r3=r1+30r4=r1+50r5=r1+70h2=6h1=h2+2h3=h2+2ang=15ang1=3ang2=63.單擊Close關(guān)閉對(duì)話(huà)框。第5步：建立齒輪模型1 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Creat>Keypoints>InActiveCS。CreatKeypointsinActiveCoordinateSystem對(duì)話(huà)框?qū)⒊霈F(xiàn)。2 .輸入Keypointnumber（關(guān)鍵點(diǎn)號(hào)）為1,X,Y,Z位置分別為r1,0,0。可用TAB鍵在輸入?yún)^(qū)之間移動(dòng)。3 .單擊Apply。4 .對(duì)下面的關(guān)

5、鍵點(diǎn)及X,Y,Z位置重復(fù)這一過(guò)程：關(guān)鍵點(diǎn)2:r4,0,0關(guān)鍵點(diǎn)3：r4,0,h3關(guān)鍵點(diǎn)4：r3,0,h3關(guān)鍵點(diǎn)5:r3,0,h2關(guān)鍵點(diǎn)6:r2,0,h2關(guān)鍵點(diǎn)7:r2,0,h1關(guān)鍵點(diǎn)8:r1,0,h1輸入完最后一個(gè)關(guān)鍵點(diǎn)后，單擊OK。5 .選取菜單途徑UtilityMenu>PlotCtrls>Pan,Zoom,Rotate6在出現(xiàn)的Pan,Zoom,Rotate對(duì)話(huà)框中單擊Iso。7 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Creat>-Areas-Arbitrary>ThroughKPs。拾取菜單將會(huì)出現(xiàn)。8 .在圖

6、形窗口中依次選取關(guān)鍵點(diǎn)1,2,3,4,5,6,7,8,單擊OK關(guān)閉對(duì)話(huà)框。9 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Creat>Keypoints>InActiveCSoCreatKeypointsinActiveCoordinateSystem對(duì)話(huà)框?qū)⒊霈F(xiàn)。10輸入Keypointnumber為10,X,Y,Z位置分別為0,0,0。11.單擊Apply。12輸入Keypointnumber為11,X,Y,Z位置分別為0,0,1。13 .單擊OK關(guān)閉對(duì)話(huà)框。14 .選取菜單途徑UtilityMenu>PlotCtrls>

7、;WindowControls>WindowOptions。15在WindowOptions對(duì)話(huà)框中的Locationoftriad處選Atbottomleft,然后單擊OK關(guān)閉對(duì)話(huà)框。16 .選取菜單途徑MainMenu>Preprocessor>Operate>Extrude/Sweep>-Areas-AboutAxis。拾取菜單將會(huì)出現(xiàn)。17 .在圖形窗口中選中剛剛生成的面，在拾取對(duì)話(huà)框中單擊OK。18在圖形窗口中選中節(jié)點(diǎn)10、11,在拾取對(duì)話(huà)框中單擊OK。19在出現(xiàn)的對(duì)話(huà)框的Arclengthindegrees輸入ang,單擊OK關(guān)閉對(duì)話(huà)框。20 .選取菜

8、單途徑UtilityMenu>Workplane>ChangeActiveCSto>GlobalCylindrical。21 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Creat>Keypoints>InActiveCS。CreatKeypointsinActiveCoordinateSystem對(duì)話(huà)框?qū)⒊霈F(xiàn)。22輸入Keypointnumber為50,X,Y,Z位置分別為r5,ang2,0。23 .單擊Apply。對(duì)下面的關(guān)鍵點(diǎn)及X,Y,Z位置重復(fù)這一過(guò)程：關(guān)鍵點(diǎn)51:r5,ang-ang2,0關(guān)鍵點(diǎn)52:(r4+

9、r3)/2,ang-ang1,0關(guān)鍵點(diǎn)53:(r3+r4)/2,ang,ang1輸入完最后一個(gè)關(guān)鍵點(diǎn)后，單擊OK。24 .選取菜單選項(xiàng)MainMenu>Preprocessor>NumberingCtrls>SetStartNumber。25 .在StartingNumberSpecifications對(duì)話(huà)框中的Forareas處輸入20,單擊OK關(guān)閉對(duì)話(huà)框。26 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Creat>-Areas-Arbitrary>ThroughKPs。拾取菜單將會(huì)出現(xiàn)。27在圖形窗口中依次選取關(guān)

10、鍵點(diǎn)50,51,52,53,單擊OK關(guān)閉對(duì)話(huà)框。28 .選取菜單途徑UtilityMenu>PlotCtrls>Numbering。29在出現(xiàn)的對(duì)話(huà)框中將Keypointnumber和Areanumber打開(kāi)。單擊OK關(guān)閉對(duì)話(huà)框。30 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Operate>Extrude/Sweep>-Areas-AlongLines。拾取菜單將會(huì)出現(xiàn)。31 .在圖形窗口中選中剛剛生成的20號(hào)面，在拾取菜單中單擊OK。32 .選中由12和13號(hào)關(guān)鍵點(diǎn)組成的線(xiàn)，在拾取菜單中單擊OK。在圖形窗口中將會(huì)生成一

11、個(gè)直齒形體。33 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Operate>-Boolean-Add>Volumes。拾取菜單將會(huì)出現(xiàn)。34 .單擊PickAll。35 .選取菜單途徑UtilityMenu>Select>Entities。36在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中選擇Areas,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選XCoordinates;Min,Max處輸入r3,r5。單擊Apply。37 .將坐標(biāo)分量改為ZCoordiantes;Min,Max處輸入改為h3;選

12、取方式改為Reselect單擊OK。38 .選取菜單途徑MainMenu>Preprocessor>-Modeling-Operate>-Boolean-Add>Areas。拾取菜單將會(huì)出現(xiàn)。39 .單擊PickAll。40 .選取菜單途徑UtilityMenu>Select>Entities。41在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中選擇Areas,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選ZCoordinates;清除在Min,Max處的輸入；選取方式為FromFull。單擊OK。42 .選取菜單途徑MainMenu&g

13、t;Preprocessor>-Modeling-Operate>-Boolean-Add>Areas。拾取菜單將會(huì)出現(xiàn)。43 .單擊PickAll。44 .選取菜單途徑UtilityMenu>Select>Everything。45 .單擊工具條上的SAVE_DB保存數(shù)據(jù)庫(kù)。第6步：劃分網(wǎng)格1 .選取菜單途徑MainMenu>Preprocessor>MeshingTool2 .在MeshTool菜單中先打開(kāi)SmartSize控制，再將其下的滾動(dòng)條移到4的位置。單擊Close關(guān)閉對(duì)話(huà)框。3 .選取菜單途徑UtilityMenu>Select&g

14、t;Entities。4 .在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中選擇Areas,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選YCoordinates;清除在Min,Max處的輸入；選取方式為FromFull。單擊OK。5 .選取菜單途徑MainMenu>Preprocessor>-Meshing-Mesh>-Areas-Free拾取菜單將會(huì)出現(xiàn)。6 .單擊PickAll7 .選取菜單途徑MainMenu>Preprocessor>Copy>-Nodes-Copy拾取菜單將會(huì)出現(xiàn)。8 .單擊PickAll。9在出現(xiàn)的對(duì)話(huà)框中的

15、Y-offsetinactiveCS處輸入ang,Nodenumberincrement處輸入100。單擊OK關(guān)閉對(duì)話(huà)框。10 .選取菜單途徑MainMenu>Preprocessor>Copy>Areas拾取菜單將會(huì)出現(xiàn)。11 .單擊PickAll。12在出現(xiàn)的對(duì)話(huà)框中的Y-offsetinactiveCS處輸入ang。單擊OK關(guān)閉對(duì)話(huà)框。13 .選取菜單途徑UtilityMenu>Select>Everything。14 .選取菜單途徑MainMenu>Preprocessor>NumberingCtrls>MergeItems。15 .在出

16、現(xiàn)的對(duì)話(huà)框中的下拉列表中選取Keypoints,并在Rangeofcoincidence處輸入0.01。單擊Apply。關(guān)閉可能會(huì)出現(xiàn)的警告對(duì)話(huà)框。16 .將下拉列表的選項(xiàng)改為Nodes,單擊OK關(guān)閉對(duì)話(huà)框。17 .選取菜單途徑MainMenu>Preprocessor>-Attributes-Define>DefaultAttribs。18 .在對(duì)話(huà)框中選Elementtypenumber為2。單擊OK關(guān)閉對(duì)話(huà)框。19 .選取菜單途徑MainMenu>Preprocessor>MeshingTool20 .在MeshTool對(duì)話(huà)框中選Shape為T(mén)et,選Mes

17、her為Free。單擊Mesh。拾取菜單將會(huì)出現(xiàn)。21 .單擊PickAll。在網(wǎng)格劃分完成后關(guān)閉警告對(duì)話(huà)框。22 .單擊Close關(guān)閉MeshTool對(duì)話(huà)框。23 .選取菜單途徑MainMenu>Preprocessor>-Meshing-Clear>Area拾取菜單將會(huì)出現(xiàn)。24 .單擊PickAll。關(guān)閉可能出現(xiàn)的警告對(duì)話(huà)框。第7步：生成側(cè)面組件1 .選取菜單途徑UtilityMenu>Select>Entities。2 .在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中選擇Nodes,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選YCo

18、ordinates;清除在Min,Max處的輸入。單擊OK。3 .選取菜單途徑UtilityMenu>Select>Comp/Assembly>CreateComponent。4 .在Componentname處輸入low。單擊OK。5 .選取菜單途徑MainMenu>Preprocessor>Move/Modify>-RotateNodeCS-ToActiveCS。拾取菜單將會(huì)出現(xiàn)。6 .單擊PickAll。7 .選取菜單途徑UtilityMenu>Select>Entities。8 .在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中

19、選擇Nodes,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選YCoordinates;在Min,Max處輸入ang。單擊OK。9 .選取菜單途徑UtilityMenu>Select>Comp/Assembly>CreateComponent10在Componentname處輸入high。單擊OK。11 .選取菜單途徑MainMenu>Preprocessor>Move/Modify>-RotateNodeCS-ToActiveCS。拾取菜單將會(huì)出現(xiàn)。12 .單擊PickAll。13 .選取菜單途徑UtilityMenu>Select>

20、Everythingo14 .單擊工具條上的SAVE_DB保存數(shù)據(jù)庫(kù)。第8步：生成重疊扇區(qū)，加約束1 .選取菜單途徑MainMenu>Preprocessor>CyclicSector。2 .單擊OK。3 .選取菜單途徑UtilityMenu>Select>Entities。4 .在SelectEntities對(duì)話(huà)框中的最上面的下拉列表中選擇Nodes,在另外一個(gè)下拉列表中選擇ByLocation;坐標(biāo)分量選XCoordinates;在Min,Max處輸入r1。單擊OK。5 .選取菜單途徑MainMenu>Preprocessor>Loads>-Loa

21、ds-Apply>-Structural-Displacement>OnNodes。拾取菜單將會(huì)出現(xiàn)。6 .單擊PickAll。7 .在出現(xiàn)的對(duì)話(huà)框的自由度(DOF)stobeconstrained處選擇All自由度(DOF)。單擊OK關(guān)閉對(duì)話(huà)框。8 .選取菜單途徑UtilityMenu>Select>Everything。9 .在ANSYSToolbar上單擊SAVE_DB。第9步：指定分析類(lèi)型和選項(xiàng)、求解1 .選取菜單途徑MainMenu>Solution>-AnalysisType-NewAnalysisoNewAnalysis對(duì)話(huà)框?qū)⒊霈F(xiàn)。2 .選中

22、Modalanalysis,然后單擊OK。3 .選取菜單途徑MainMenu>Solution>-AnalysisOptions,ModalAnalysis對(duì)話(huà)框?qū)⒊霈F(xiàn)。4 .選中分塊Lanczos法模態(tài)提取法；在Numberofmodestoextract處輸入5;在No.ofmodestoexpand處輸入5。單擊OK。5 .單擊OK接受缺省值。6 .在ANSYSToolbar上單擊SAVE_DB。7 .選取菜單途徑MainMenu>Solution>ModalCyclic。8 .在出現(xiàn)的對(duì)話(huà)框中輸入NDMIN和NDMAX分別為0,2;指定No.ofsectors為24;指定LOWNodecomponentnam