资源描述:
《ansys动力学分析的几个入门例子》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、问题一:悬臂梁受重力作用发生大变形,求其固有频率。 基本过程:1、建模2、静力分析 NLGEOM,ON STRES,ON 3、求静力解4、开始新的求解:modal STRES,ON UPCOORD,1,ON 修正坐标 SOLVE... 5、扩展模态解6、察看结果 /PREP7 ET,1,BEAM189 !使用beam189梁单元MPTEMP,,,,,,,, MPTEMP,1,0 MPDATA,EX,1,,210e9 MPDATA,PRXY,1,,0.3 MPDATA,DENS,1,,785
2、0 SECTYPE, 1,BEAM,RECT,secA,0 !定义梁截面secASECOFFSET,CENT SECDATA,0.005,0.01,0,0,0,0,0,0,0,0 K,,,,, !建模与分网K,,2,,,K,,2,1,, LSTR, 1, 2 LATT,1,,1,, 3,,1 LESIZE,1,,,20,,,,,1 LMESH, 1 FINISH /SOL !静力大变形求解ANTYPE,0NLGEOM,1
3、 PSTRES,ON !计及预应力效果DK,1,,,,0,ALL,,,,,, ACEL,0,9.8,0, !只考虑重力作用TIME,1 AUTOTS,1NSUBST,20,,,1 KBC,0 SOLVE FINISH /SOLUTION ANTYPE,2 !进行模态求解MSAVE,0 MODOPT,LANB,10 MXPAND,10,,,0 !取前十阶模态PSTRES,1
4、 !打开预应力效应MODOPT,LANB,10,0,0,,OFFUPCOORD,1,ON !修正坐标以得到正确的应力PSOLVE,TRIANG !三角化矩阵PSOLVE,EIGLANB !提取特征值和特征向量FINISH /SOLU EXPASS,1 !扩展模态解PSOLVE,EIGEXP FINISH /POST1 SET,LIST !观察结果FINISH 问题二:循环对称结构
5、模态分析这是ANSYSHELP里的例子,但那个命令流似乎有些问题,下面是整理过的命令流。 基本过程:1、建模2、definecyclic3、定义约束4、求模态解5、展开并察看结果 r1=5 !建模r2=10d1=2nsect=24alpha_deg=360/nsectalpha_rad=2*acos(-1)/nsect /prep7csys,1k,1,0,0,0k,2,0,0,d1k,3,r1,0,0k,4,r1,0,d1l,3,4arotat,1,,,,,,1,2,alpha_deg/2k,7,r2,0,0k,8,r2,0
6、,d1l,7,8arotat,5,,,,,,1,2,alpha_deg/2arotat,2,,,,,,1,2,alpha_deg/2arotat,6,,,,,,1,2,alpha_deg/2a,5,6,10,9mshkey,1et,1,181r,1,0.20r,2,0.1mp,ex,1,10e6mp,prxy,1,0.3mp,dens,1,1e-4esize,0.5asel,,,,1,4aatt,,1asel,,,,5aatt,,2allsel CYCLIC,,,,'CYCLIC' !定义基本扇区AMESH,all !
7、分网FINISH /SOL !求模态解ANTYPE,2MODOPT,LANB,10 MXPAND,10,,,0 PSTRES,0MODOPT,LANB,10,0,0,,OFFDK,5,,,,0,UZ,,,,,, SOLVE FINISH /POST1 SET,LISTSET,,,1,,,,4, /CYCEXPAND,,ON PLNS,U,SUM !观察扩展模态FINISH问题三:三角平台受谐波载荷作用,求结构响应谐波载荷为作用