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ANSYS 动力分析 (18) - 随机振动分析 - 实例 (1)
2010-09-26 07:41:23| 分类: ANSYS 动力分析 | 标签:随机振动实例模型量定义完毕:
计算变量 2 的 PSD 功率谱,存为变量 3:
显示变量 3 的曲线:
将图形改为对数–对数形式,操作如下:
设置有关参数: x,y 轴的标记、 x,y 轴的类型 (线性或对数)
按更改后的参数重新绘制变量图形:
显示变量 2:
附录: 输入文件 的内容
! Modal analysis exercise for Dynamics Seminar
! Model airplane wing
!
finish
/clear
/udoc,1,date,off
plete=0 ! 如果将此句改为 plete = 1,将会执行完整的分析,否那么只是生成模型
/filnam,wing
/title,Modal analysis of a model airplane wing
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! Element types and materials
/prep7
et,1,82
et,2,95
*if,plete,eq,1,then
mp,ex,1,38000
mp,dens,1,-3/12
mp,prxy,1,
*endif
! Create and mesh the area
k,1
k,2,2
k,3,,
k,4,,
k,5,1,
l,1,2
l,1,5
bspline,2,3,4,5,,,-1,0,0, -1,-,0
al,all
esize,
amesh,all
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! Extrude volume mesh from the area
type,2
extopt,esize,10
extopt,aclear,1
vext,all,,,0,0,10
/view,,1,1,1
eplot
save
! Analysis type and options
*if,plete,eq,1,then
/solu
antype,modal
modopt,lanb,15
mxpand,15,,,yes
! Constraints
asel,,loc,z,0
da,all,all
asel,all
!*
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solve
finish
/solution
/title, Random Vibrations analysis (PSD) of an airplane wing
antype,spectrum
spopt,psd,15,yes
psdunit,1,accg,
psdfrq
psdfrq,1,,20,100,400,600
psdval,1,,,,
asel,s,loc,z,0
da,all,uy,1 ! apply excitation in UY direction
asel,all
outre,nsol,all
! pute participation factors
pfact,1,base
psdout,disp,rel
psdout,velo,abs
psdout,acel,abs
psd
solve
finish