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1、形貌优化上机报告情景模型：要求使用OptiStruct形貌优化功能对一个承受扭转载荷的平板执行形貌优化，优 化的目标是是施加力处的节点沿Z轴正方向的位移最小。要求不改变厚度，只通过改变板的 形状达到目的。为达到优化目标，需要对该零件起肋以加强结构，且设计的加强肋易于冲压。该平板有限元模型，其边界条件(约束、载荷)、材料属性和工况均已定义。优化问题描述：约 束：如图1所示(FORCE=1.00e+02)目标：给定节点的唯一最小化设计变量：设计空间的形状变量Model Info: C:/Users/admin/DesktopAorsion_ploite.hrn图1约束载荷图1问题分析设置(Hype
2、rMesh) 表一参数设置平板厚度1.0mm最小起肋宽度3.0mm起肋角度60起肋最大高度4.0mmUpper Bound1.0mmLower Bound0.0mm响应节点Node2500响应类型Z方向位移拔模方向法线方向2运行计算(Optimization)及结果査看(HyperView) 运行优化得出以下结果：Contour PlotShape Change(Mag) .Analysis system ooliliehiliO.OOOE-K1OO.OOLIEHILIModel info: 1R esult: C: /Us e rs/ a d m i n/D es kto p/to rs i
3、o n_ p I at e1_de s .h3dDesign : Iteration 0Frame 1O.OLILIEHILIO.OLILlE-HjLI0.000E-K10O.OOOE-rflO0.00LIEHILI0.00LIEHILIo.oliliehili No result Max = O.OOOE-HjO Grids 1Min 二 0.000EUILIGrids 1E图1迭代前平板模型Contour PlatMaciel info: 1Shape Change(Mag)Analysis system4.000E-HJ03.556E-HJ0Result: C:/Users/admin/
4、Desktop/torsian_plate_des.h3dDesign : Iteratian 19Frame 203.111E-HJ02.667E-HJ02.222E-HJ01.778E-HJ01.333E-HJ08.889E-014.444E-01O.OOOE-HJO No result Max = 4.000E-KJ0 Grids 5Min = O.OOOE-HJO Grids 12Z图2第19步迭代的加强肋分布云图Contour PlotModel info: 1Element Stresses (2D &3D)(vonMises, Max)Result: C:/Users/admin
5、/Desktop/torsion_plate1_s1 ,h3d5.566E2A暫赢暑唸列Subcase 1 (tarsian) - Static Analysis : Iteration 05.442E2Frame 45.318E25.194E25.070E24.822E24.698E24.946E24.574E2 No result Max = 5.690E+02 2D 2449Min = 4.574E2 2D 2476Z图3迭代前的等效应力分布云图Contour PlotModel info: 1Element Stresses (2D &3D)(vanMises, Max) Analys
6、is system3.924E23.518E2Result: C:/Users/admin/Desktop/torsion_plate1_s1 ,h3dSubcase 1 (torsion) - Static Analysis : Iteration 19Frame 43.112E22.706E22.300E21.894E21.488E21.082E26.760E12.700E1 No result Max = 3.924E+02 2D 2462Min = 2.700E1 2D 1488ZContour PlotDispla 匚 eiEiti：h1；mg；i Analysis system3.
7、935E13.498E13.060E12.623E1Model info: 1Result: C: /Us e rs/ a d rn i n/D e s kt o p/t o rs io n_ pl ate 1 _ s 1 .h3dSubcase 1 (torsion) - Stati匚 Analysis : Iteration UFrame 42.186E1一1.749E1w-8.744E04.372E0ri.LIULlEIU No result Max = 3.935EKI1 Grids 2500Min 二 O.OUOEKIO Grids 2501Z图5迭代前位移云图Contour Plo
8、tDi 即 lacement(Mag) Analysis system -4.724E0 -4.199E 血3.674E03.150E0Model info: 1Result: C: /Us e rs/ a d rn i n/D e s kt o p/t o rs io n_ pl ate 1 _ s 1 .h3dSubcase 1 (torsion) - Stati匚 Analysis : Iteration 19Frame 42.625E0一2.100E01.575E0w-1.050E01-5.249E-01 No resultMax = 4.724E+00Grids 2500Min =
9、O.OOOEOGrids 2600ZYX图6迭代后位移云图图7目标函数变化图表二节点2500的Z方向位移迭代次数%Change （位移改变率）Z方向位移（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+
10、0014-0.544.85915E+0015-0.924.81457E+0016-0.574.78720E+0017-0.704.75384E+0018-0.314.73916E+0019-0.404.72034E+00表三等效应力变化最大初始应力5.690E+02MPa最小初始应力4.574E+02MPa迭代后最大应力3.92E+02MPa迭代后最小应力2.700E+01MPa表四位移变化迭代前最大位移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结论分析从表中我们可以看出：优化后，节点2500的最大位移由3.935E+01mm减小成了
11、4.724E+00mm ；最大应力由 5.690E+02MPa 减小成了 4,574E+02MPa ；最小应力由 4.574E+02MPa 减小成了 2.700E+01MPa.由此看出优化后的节点2500的位移量达到了最小，该优化加强了平板的抗扭转能力，该 优化方案可行.附：由于以上结构加工困难，采用合理对称约束可以使得加强肋呈线性分布，固有以下分 析及结果：Contour PlotModel info: 1Shape Change(Mag) Analysis system w-4.000E0Result: C:/Users/admin/Deskt叩/torsion_plate21_cles.
12、h別Design : Iteration 12Frame 133.556E03.111E02.667E02.222E01.778E01.333E08.S89E-014.444E-01-.OOOEO No resultMax = 4.000E+00 Grids 3Min = O.OOOEO Grids 246Z图9最后一步迭代的加强筋分布云图图10迭代前的位移分布图Model info: 1Model info: 1Result: C:/Users/adrriin/Deskt叩/怕阳血卩也馆囚白,h3dSubcase 1 (torsion) - Static Analysis : Iterati
13、on 0Frame 4-5.566E25.442E25.318E25.194E25.070E24.946E2w-4.S22E2-4.698E2Contour Plot Displacement (Mag) Analysis system 3.256E-HJ12.894E-HJ12.532E-HJ12.171E-HJ11.809E-HJ11.447E-HJ11.085E-HJ1-7.235E-HJ0-3.618E-HJ0-O.OOOE-HJO No resultMax = 3.256El1Grids 2500Min = O.OOOE-HJOGrids 2600Z图11迭代后的位移分布图Contour PlotElement Stresses (2D &. 3D)(vanMises, Max) Analysis system w-5.690E2-4.574E2 No resultMax = 5.690E+02 2D 2449Min = 4.574E2 2D 2476图12迭代前等效应力图图1
