ANSYS动力学分析的几个入门例子.doc
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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,,7850
SECTYPE, 1,BEAM,RECT,secA,0 !
定义梁截面secA
SECOFFSET,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,0
NLGEOM,1
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,1
NSUBST,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 !
打开预应力效应
MODOPT,LANB,10,0,0,,OFF
UPCOORD,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、definecyclic
3、定义约束
4、求模态解
5、展开并察看结果
r1=5 !
建模
r2=10
d1=2
nsect=24
alpha_deg=360/nsect
alpha_rad=2*acos（-1）/nsect
/prep7
csys,1
k,1,0,0,0
k,2,0,0,d1
k,3,r1,0,0
k,4,r1,0,d1
l,3,4
arotat,1,,,,,,1,2,alpha_deg/2
k,7,r2,0,0
k,8,r2,0,d1
l,7,8
arotat,5,,,,,,1,2,alpha_deg/2
arotat,2,,,,,,1,2,alpha_deg/2
arotat,6,,,,,,1,2,alpha_deg/2
a,5,6,10,9
mshkey,1
et,1,181
r,1,0.20
r,2,0.1
mp,ex,1,10e6
mp,prxy,1,0.3
mp,dens,1,1e-4
esize,0.5
asel,,,,1,4
aatt,,1
asel,,,,5
aatt,,2
allsel
CYCLIC,,,,'CYCLIC' !
定义基本扇区
AMESH,all !
分网
FINISH
/SOL !
求模态解
ANTYPE,2
MODOPT,LANB,10
MXPAND,10,,,0
PSTRES,0
MODOPT,LANB,10,0,0,,OFF
DK,5,,,,0,UZ,,,,,,
SOLVE
FINISH
/POST1
SET,LIST
SET,,,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,BEAM189
ET,2,SHELL93
R,1,0.01,,,,,,
MP,EX,1,210e9
MP,PRXY,1,0.3
MP,DENS,1,7850
SECTYPE, 1,BEAM,RECT,secA,0
SECOFFSET,CENT
SECDATA,0.005,0.008,0,0,0,0,0,0,0,0
K,,-0.5,,,
K,,0.5,,,
K,,,,1,
K,,,1,1,
K,,-0.5,1,,
K,,0.5,1,,
K,,,,0.5,
A,4,5,6
LSTR, 1, 5
LSTR, 3, 4
LSTR, 2, 6
LSEL,S,LINE,,4,6
LATT,1,1,1,, 7,,1
LSEL,,,,ALL
LESIZE,ALL,,,10,,,,,1
LMESH,4,6
TYPE, 2
MSHAPE,0,2D
MSHKEY,1
AMESH,1
FINISH
/SOL !
为了使用模态叠加法谐分析
ANTYPE,2
MODOPT,LANB,20 !
先取结构前20阶模态
MXPAND,20,,,0
MODOPT,LANB,20,0,0,,OFF
KSEL,S,KP,,1,3
DK,ALL,,,,0,ALL,,,,,,
SOLVE
FINISH
!
/POST1 !
最好事先看一下模态结果
!
SET,LIST !
以了解模态频率范围
!
FINISH
/SOL !
模态叠加法谐响应分析
ANTYPE,3
HROPT,MSUP
HROUT,ON
HROPT,MSUP,20,,
HROUT,ON,OFF,0
F,177,FY,-10, !
施加10N的力在节点177的负Y方向
HARFRQ,5,70, !
载荷的强制频率范围
NSUBST,200,
KBC,1
ALPHAD,5,
SOLVE
FINISH
/POST26 !
察看位移响应
FILE,,rfrq
NUMVAR,20
NSOL,2,139,U,Y,
PLVAR,2
FINISH
问题四：
三角平台受一地震谱激励,求应力分布和支反力
基本过程：
1、建模
2、求模态解
3、求谱解
4、扩展模态
5、模态合并
6、观察结果
/PREP7 !
建模
ET,1,BEAM189
ET,2,SHELL93
R,1,0.01,,,,,,
MP,EX,1,210e9
MP,PRXY,1,0.3
MP,DENS,1,7850
SECTYPE, 1,BEAM,RECT,secA,0
SECOFFSET,CENT
SECDATA,0.005,0.008,0,0,0,0,0,0,0,0
K,,-0.5,,,
K,,0.5,,,
K,,,,1,
K,,,1,1,
K,,-0.5,1,,
K,,0.5,1,,
K,,,,0.5,
A,4,5,6
LSTR, 1, 5
LSTR, 3, 4
LSTR, 2, 6
LSEL,S,LINE,,4,6
LATT,1,1,1,, 7,,1
LSEL,,,,ALL
LESIZE,ALL,,,10,,,,,1
LMESH,4,6
TYPE, 2
MSHAPE,0,2D
MSHKEY,1
AMESH,1
FINISH
/SOL !
取前十阶模态
ANTYPE,2
MODOPT,LANB,10
KSEL,S,KP,,1,3
DK,ALL,,,,0,ALL,,,,,,
SOLVE
FINISH
/SOL !
谱分析
ANTYPE,8
SPOPT,SPRS,10,1
SVTYP,3
SED,0,1,0, !
给出激励方向
FR
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