1、T1143-120110430121方思遠形貌優(yōu)化上機報告情景模型：要求使用OptiStruct形貌優(yōu)化功能對一個承受扭轉(zhuǎn)載荷的平板執(zhí)行形貌優(yōu)化，優(yōu) 化的目標(biāo)是是施加力處的節(jié)點沿Z軸正方向的位移最小。要求不改變厚度，只通過改變板的 形狀達到目的。為達到優(yōu)化目標(biāo)，需要對該零件起肋以加強結(jié)構(gòu)，且設(shè)計的加強肋易于沖壓。該平板有限元模型，其邊界條件(約束、載荷)、材料屬性和工況均已定義。優(yōu)化問題描述：約 束：如圖1所示(FORCE=1.00e+02)目標(biāo)：給定節(jié)點的唯一最小化設(shè)計變量：設(shè)計空間的形狀變量Model Info: C:/Users/admin/Desktop/torsion_plate.h

2、m圖1約束載荷圖1.問題分析設(shè)置(HyperMesh)表一參數(shù)設(shè)置平板厚度1.0mm最小起肋寬度3.0mm起肋角度60起肋最大高度4.0mmUpper Bound1.0mmLower Bound0.0mm響應(yīng)節(jié)點Node2500響應(yīng)類型Z方向位移拔模方向法線方向2.運行計算(Optimization)及結(jié)果查看(HyperView)運行優(yōu)化得出以下結(jié)果：Contour Plot0.000E-K10Model info: 1O.OLILIEHILIO.OOOE4OO.OOOE4OO.OLILIEHILIO.OOOE4OO.OOOE-K1OO.OLILIEHILIShape Change (Mag

3、) .Analysis system ooliliehilio.oliliehili No resultMax = O.OOOE-HjOGrids 1Min = 0.0LI0EUILIGrids 1EResult: C:/Users/admin/Desktop/torsion_pIate1_des.h3dDesign : Iteration 0Frame 1圖1迭代前平板模型Contour PlatMaciel info: 1Shape Change(Mag) Analysis system 4.000E-HJ03.556E-HJ0Result: C:/Users/admin/Desktop/

4、torsian_plate_des.h3dDesign : Iteration 19Frame 203.111E-HJ02.667E-HJ02.222E-HJ01.778E-HJ01.333E-HJ08.889E-014.444E-01O.OOOE-HJO No resultMax = 4.000E-KJ0Grids 5Min = O.OOOE-HJOGrids 12Z圖2第19步迭代的加強肋分布云圖Contour PlotElement Stresses (2D &3D)(vonMises, Max)Analysis system5.690E25.566E2Model info: 1Resu

5、lt: C:/Users/admin/Desktop/torsion_plate1_s1 ,h3dSubcase 1 (tarsian) - Static Analysis : Iteration 0Frame 45.442E25.318E25.194E25.070E24.946E24.822E24.698E24.574E2 No result Max = 5.690E+02 2D 2449Min = 4.574E2Contour PlotModel info: 1Element Stresses (2D &3D)(vanMises, Max) Analysis system3.924E23.

6、518E2Result: C:/Users/admin/Desktop/torsion_plate1_s1 ,h3dSubcase 1 (torsion) - Static Analysis : Iteration 19Frame 43.112E22.706E22.300E21.894E21.488E21.082E26.760E12.700E1 No resultMax = 3.924E+02 2D 2462Min = 2.700E1 2D 1488Z圖5迭代前位移云圖Model info: 1Result: C:/Users/admin/Desktop/torsion_plate1_s1 ,

7、h3dSubcase 1 (torsion) - Static Analysis : Iteration 19Frame 4Contour Plot Displacement(Mag) Analysis system -4.724E0 -4.199E 旬3.674E03.15CIEHID2.625E02.100E01.5 符 EHID w-1.050E0 1-5.249E-010 qoOEO No resultMax = 4.724E+00 Grids 2500Min = O.OOOEO Grids 2600Z圖6迭代后位移云圖圖7目標(biāo)函數(shù)變化圖迭代次數(shù)%Change （位移改變率）Z方向位移

8、（TZ MIN）（mm）003.935E+011-0.173.928E+012-40.072.354E+013-39.841.416E+014-32.029.628E+005-28.456.889E+006-8.936.273E+007-0.756.226E+008-9.665.624E+009-6.155.278E+00100.295.294E+0011-4.365.063E+0012-1.594.983E+0013-1.954.886E+0014-0.544.85915E+0015-0.924.81457E+0016-0.574.78720E+0017-0.704.75384E+0018-

9、0.314.73916E+0019-0.404.72034E+00表三等效應(yīng)力變化最大初始應(yīng)力5.690E+02MPa最小初始應(yīng)力4.574E+02MPa表二節(jié)點2500的Z方向位移迭代后最大應(yīng)力3.92E+02MPa迭代后最小應(yīng)力2.700E+01MPa表四位移變化迭代前最大位移3.935E+01mm迭代后最小位移0mm迭代后最大位移4.724E+00mm迭代后最小位移0mm3.結(jié)論分析從表中我們可以看出：優(yōu)化后，節(jié)點2500的最大位移由3.935E+01mm減小成了 4.724E+00mm ；最大應(yīng)力由 5.690E+02MPa 減小成 了 4,574E+02MPa ；最小應(yīng)力由 4.57

10、4E+02MPa 減小成 了 2.700E+01MPa.由此看出優(yōu)化后的節(jié)點2500的位移量達到了最小，該優(yōu)化加強了平板的抗扭轉(zhuǎn)能力，該 優(yōu)化方案可行.附：由于以上結(jié)構(gòu)加工困難，采用合理對稱約束可以使得加強肋呈線性分布，固有以下分 析及結(jié)果：圖9最后一步迭代的加強筋分布云圖圖10迭代前的位移分布圖Contour Plot Displacement (Mag) Analysis system -3.256E-HJ1 L2.894E-HJI2.532E-HJ12.171E-HJ11.809E-HJ11.447E-HJ11.085E-HJ1-7.235E-HJ0-3.618E-HJ0-O.OOOE-

11、HJO No result Max = 3.256El1 Grids 2500Min = O.OOOE-HJO Grids 2600ZModel info: 1Result: C:/Users/admin/Desktop/torsion_plate21_s1 ,h3dSubcase 1 (torsion) - Static Analysis : Iteration 0Frame 4Model info: 1Result: C:/Users/admin/Desktop/torsion_plate21_s1 ,h3d Subcase 1 (torsion) - Static Analysis :

12、Iteration 12圖11迭代后的位移分布圖Contour PlotElement Stresses (2D &. 3D)(vanMises, Max) Analysis system w-5.690E2-5.566E25.442E25.318E25.194E25.070E24.946E2w-4.S22E2-4.698E2-4.574E2 No resultMax = 5.690E+022D 2449Min = 4.574E2 2D 2476Contour PlotElement Stresses (2D &. 3D)(vanMises, Max)Analysis system5.337E25.035E2Model info: 1Result: C:/Users/admin/Desktap/torsion_plate21_s1 ,h3dSubcase 1 (torsion) - Static Analysis : Iteration 12Frame