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1、ANSYS动力学分析的几个入门例子问题一：悬臂梁受重力作用发生大变形，求其固有频率。图片附件:1.jpg(4.85K)基本过程：1、建模2、静力分析NLGEOM,ONSTRES,ON3、求静力解4、开始新的求解：modalSTRES,ONUPCOORD,1,ON修正坐标SOLVE...5、扩展模态解6、察看结果/PREP7ET,1,BEAM189!使用beam189梁单元MPTEMP,,,,,,,,MPTEMP,1,0MPDATA,EX,1,,210e9MPDATA,PRXY,1,,0.3MPDATA,DENS,1,,7850SECTYPE,1,BEAM,RECT,secA,0!定义梁截面
2、secASECOFFSET,CENTSECDATA,0.005,0.01,0,0,0,0,0,0,0,0K,,,,,!建模与分网K,,2,,,K,,2,1,,LSTR,1,2LATT,1,,1,,3,,1LESIZE,1,,,20,,,,,1LMESH,1FINISH/SOL!静力大变形求解ANTYPE,0NLGEOM,1PSTRES,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,1AUTOTS,1NSUBST,20,,,1KBC,0SOLVEFINISH/SOLUTIONANTYPE,2!进行模态求解MSAVE,0MODOP
3、T,LANB,10MXPAND,10,,,0!取前十阶模态PSTRES,1!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/SOLUEXPASS,1!扩展模态解PSOLVE,EIGEXPFINISH/POST1SET,LIST!观察结果FINISH问题二：循环对称结构模态分析这是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。图片附件:2.gif(18.74K)基本过程：1、建模2、definecyc
4、lic3、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,d1l,7,8arotat,5,,,,,,1,2,alpha_deg/2arotat,2,,,,,,1,2,alpha_deg/2arotat,6,,,,,,1,2,alpha_deg/2a,5,6,
5、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,,2allselCYCLIC,,,,'CYCLIC'!定义基本扇区AMESH,all!分网FINISH/SOL!求模态解ANTYPE,2MODOPT,LANB,10MXPAND,10,,,0PSTRES,0MODOPT,LANB,10,0,0,,OFFDK,5,,,,0,UZ,,,,,,SOLVEFINISH/POST1SET,LISTSET,,,1,,,,4,/
6、CYCEXPAND,,ONPLNS,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在平台上面一点的集中力，幅值为10N，频率范围5Hz~70Hz基本过程：1、建模2.求模态解3、用模态叠加法作谐分析4.观察结果/PREP7!建模ET,1,BEAM189ET,2,SHELL93R,1,0.01,,,,,,MP,EX,1,210e9MP,PRXY,1,0.3MP,DENS,1,7850SECTYPE,1,BEAM,RECT,secA,0SECOFFSET,CENTSECDATA,0.005,0.008,0,0,0,0,0,0,0,0K,,-0.5,
7、,,K,,0.5,,,K,,,,1,K,,,1,1,K,,-0.5,1,,K,,0.5,1,,K,,,,0.5,A,4,5,6LSTR,1,5LSTR,3,4LSTR,2,6LSEL,S,LINE,,4,6LATT,1,1,1,,7,,1LSEL,,,,ALLLESIZE,ALL,,,10,,,,,1LMESH,4,6TYPE,2MSHAPE,0,2DMSHKEY,1AMESH,1FINISH/SOL!为了使用模态叠加法
