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我写的压电微悬臂梁的程序,但是在主梁边缘加载一个FZ方向1E-2N的力求解以后,第一次网格用LESIZE,ALL,e-5, , , ,1, , ,1 ,求解以后后处理里面没有显示出PLOT RESULT
出现,后面几次我加大了网格,求解里面是出现了,但是会提示 the degree of freedom solution is not available....
另外我求解的时候还有一个警告,谁帮我看看是那里出了问题。。。多谢了!偶是新新手哇
/prep7
/title,PIEZ CANTILEVER BEAM
/UNIT,SI ! Unit setting (International Standard)
!/define PZT material properties
mp,dens,1,7500
tb,ANEL,1 ! stiffness C, N/m^2
tbdata,1,12.6E10,7.95E10,8.41E10 ! c11,c12,c13
tbdata,7,12.6E10,8.41E10 ! c11,c33
tbdata,12,11.7E10 ! c33
tbdata,16,2.30E10
tbdata,19,2.30E10
tbdata,21,2.35E10
tb,PIEZ,1 ! PIEZ constant, C/m^2
tbdata,3,-6.5 ! e31
tbdata,6,-6.5 ! e31
tbdata,9,23.3 ! e33
tbdata,11,17.0 ! e15
tbdata,13,17.0 ! e15
!/define main beam material properties
mp,dens,2,7800
mp,EX,2,209e9
mp,nuxy,2,0.3
!/define dimension of PZT
L=3e-4
W=3e-4
H =2e-5
!/define dimension of main beam
L1=8E-4
H1=3e-5
block,,L,0,W,0,H !bottom PZT
block,0,L1,0,W,H,H+H1 !MAIN BEAM
block,0,L,0,W,H+H1,H+H1+H !top PZT
vglue,all !booleam connection
et,1,solid5,3 !define the element of PIEZ
et,2,solid45 !define the element of beam
asel,s,loc,Z,H
cm,CM_1,area
cmplot,CM_1
accat,CM_1
asel,s,loc,Z,H1+H
cm,CM_2,area
accat,CM_2
! meshing
LESIZE,ALL,e-5, , , ,1, , ,1
mat,1 $ type,1 !BOTTOM PZT
Vmesh,1
mat,2 $ type,2 !MAIN BEAM
Vmesh,5
mat,1 $ type,1 !TOP pzt
vmesh,4
Nsel,s,loc,Z,0 !define top electrode
cp,1,volt,all
*get,n_top,node,0,num,min
Nsel,s,loc,Z,H+H1+H !define bottom electrode
cp,2,volt,all
*get,n_bot,node,0,num,min
Nsel,s,loc,Z,H !couple the area
nsel,r,loc,x,0,L
cm,CM_3,node
Nsel,s,loc,Z,H+H1
Nsel,r,loc,x,0,L
cm,CM_4,node
cmsel,s,cm_3,node
cmsel,a,cm_4,node
cp,3,volt,all
finish
/solu
ANTYPE,MODAL
MODOPT,LANB,3 ! EXTRACT 3 MODES
MXPAND,3
nsel,s,loc,x,0
d,all,ux,0,,,,uy,uz
d,n_top,volt,0 !short circuit the top electrode
d,n_bot,volt,0 !short circuit the bottom electrode
nsel,all |
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