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月光下的你

铁虫 (小有名气)

[求助] 能给看看吗,ansys 算的模态分析频率总是零,,谢谢各位了

ansys 算的模态分析频率总是零
一下是命令流
FINISH
/CLEAR
/prep7


定义单元类型

ET,1,SOLID65
ET,2,SHELL63
ET,3,beam188
定义实常数

R,1,0.9
R,2,0.4
R,3,1
R,4,0.7

SECTYPE,1,BEAM,RECT,,0
SECDATA,0.8,1,0,0,0,0,0,0,0,0,0,0

SECTYPE,2,BEAM,RECT,,0
SECDATA,2,1.1,0,0,0,0,0,0,0,0,0,0
secoffset,user,-0.5

SECTYPE,3,BEAM,RECT,,0
SECDATA,1,0.9,0,0,0,0,0,0,0,0,0,0
secoffset,user,0.3

SECTYPE,4,BEAM,RECT,,0
SECDATA,1.8,1.0,0,0,0,0,0,0,0,0,0,0
secoffset,user,0.45

MP,EX,1,3.15E10
MP,NUXY,1,0.2
MP,DENS,1,2500

MP,EX,2,3.45E10
MP,NUXY,2,0.2
MP,DENS,2,2500

土体参数

MP,EX,3,12E6
MP,NUXY,3,0.30
MP,DENS,3,1600
TB,DP,3,,,
TBDATA,3,28E3,18


建几何模型

AA=20.7
BB=6.05
QQ=7.5
CC=0.4
DD=0.7
EE=0.8
PP=1.0
FF=9.0
GG=0.9
HH=1.0
LL=36
MM=4.5
KK=62.1
NN=8.55
RR=20

K,1,(AA/2-DD/2),(BB-GG/2),,
K,2,0,(BB-GG/2)
K,3,-(AA/2-DD/2),(BB-GG/2),,
K,4,-(AA/2-DD/2)
k,5,0,0,0
K,6,(AA/2-DD/2)
K,7,(AA/2-DD/2),-(QQ-HH/2),,
k,8,0,-(QQ-HH/2)
k,9,-(AA/2-DD/2),-(QQ-HH/2),,


l,1,2
l,2,3
l,3,4
l,4,5
l,5,6
l,6,7
l,7,8
l,8,9
l,4,9
l,1,6

K,10,AA
K,11,AA,,-LL
L,10,11

ADRAG,1,2,3,9,8,7,11
ADRAG,6,10,,,,,11
ADRAG,4,5,,,,,11
LDELE,11,,,1
AGLUE,all
NUMCMP,ALL


K,19,0,0,-MM
K,20,0,(BB-GG/2),-MM
L,19,20
LGEN,4,30,,,,,-FF


K,27,0,0,-MM
K,28,0,-(QQ-HH/2),-MM
L,27,28
LGEN,4,34,,,,,-FF

建立土模型

K,1801,(AA/2-DD/2)
K,1802,KK/2
K,1803,KK/2,NN
K,1804,(AA/2-DD/2),NN
K,1805,,NN
K,1806,,(BB-GG/2)
K,1807,,(BB-GG/2),-LL
K,1808,(AA/2-DD/2),(BB-GG/2)

L,1804,1801
L,1801,1802
L,1802,1803
L,1803,1804
L,1805,1804
L,1804,1808
L,1808,1806
L,1806,1805
L,1806,1807

AL,38,39,40,41
AL,42,43,44,45
ASEL,S,,,11,12,1
CM,AA2,AREA
VDRAG,AA2,,,,,,46



K,1809,KK/2,-RR
K,1810,(AA/2-DD/2),-RR
K,1811,,-RR
K,1812,,-(QQ-HH/2)
K,1813,,-(QQ-HH/2),-LL
K,1814,(AA/2-DD/2),-(QQ-HH/2),,


L,1810,1801
L,1802,1809
L,1809,1810

L,1811,1810
L,1810,1814
L,1814,1812
L,1812,1811

L,1812,1813

AL,39,62,63,64
AL,65,66,67,68

ASEL,S,,,23,24,1
CM,AA3,AREA
VDRAG,AA3,,,,,,69
ALLSEL,ALL

VSEL,S,,,1,4,1
CM,VV1,VOLU
VSYMM,X,VV1
ALLSEL,ALL
AOVLAP,ALL
VGLUE,ALL
NUMMRG,KP
NUMCMP,ALL


划分网格

中柱
LSEL,S,,,30,33,1
CM,LL1,LINE
LATT,2,,3,,,,1
LESIZE,LL1,,,6
LMESH,ALL
LSEL,ALL
LSEL,S,,,34,37,1
CM,LA1,LINE
LATT,2,,3,,,,1
LESIZE,LA1,,,7
LMESH,ALL



LSEL,ALL
LSEL,S,,,22
LATT,1,,3,,,,2
LESIZE,22,,,36
LMESH,ALL


LSEL,ALL
LSEL,S,,,26
LATT,1,,3,,,,3
LESIZE,26,,,36
LMESH,ALL


LSEL,ALL
LSEL,S,,,14
LATT,1,,3,,,,4
LESIZE,14,,,36
LMESH,ALL


顶板

LSEL,ALL
LSEL,S,,,13,16,3
CM,LL2,LINE
LESIZE,LL2,,,36
LSEL,ALL
LSEL,S,,,1,2,1
LSEL,A,,,12,15,3
CM,LL3,LINE
LESIZE,LL3,,,10
ASEL,ALL
ASEL,S,,,1,2,1
CM,AAA1,AREA
AATT,1,1,2
AMESH,AAA1

中板

LSEL,ALL
LSEL,S,,,18,25,7
CM,LL4,LINE
LESIZE,LL4,,,36
LSEL,ALL
LSEL,S,,,4,5,1
LSEL,A,,,11,27,16
CM,LL5,LINE
LESIZE,LL5,,,10
ASEL,ALL
ASEL,S,,,7,8,1
CM,AAA2,AREA
AATT,1,2,2
AMESH,AAA2

底板
LSEL,ALL
LSEL,S,,,20,24,4
CM,LL6,LINE
LESIZE,LL6,,,36
LSEL,ALL
LSEL,S,,,7,8,1
LSEL,A,,,21,23,2
CM,LL7,LINE
LESIZE,LL7,,,10
ASEL,ALL
ASEL,S,,,5,6,1
CM,AAA3,AREA
AATT,1,3,2
AMESH,AAA3


侧板
LSEL,ALL
LSEL,S,,,3,10,7
LSEL,A,,,17,29,12
CM,LL8,LINE
LESIZE,LL8,,,6

LSEL,ALL
LSEL,S,,,6,9,3
LSEL,A,,,19,28,9
CM,LA2,LINE
LESIZE,LA2,,,7

ASEL,ALL
ASEL,S,,,3,4,1
ASEL,A,,,9,10,1
CM,AAA4,AREA
AATT,1,4,2
AMESH,AAA4

划分体单元
ALLSEL,ALL
SMRT,1
VSEL,S,,,1,8,1
CM,VV3,VOLU
VATT,3,,1
VSWEEP,VV3
NUMMRG,ALL
NUMCMP,ALL
FINISH

/ESHAPE,1
EPLOT

施加约束及重力荷载

/SOLU
NSEL,ALL
ACEL,0,9.8,0,
ASEL,S,,,20,21,1
ASEL,A,,,29,37,8
DA,ALL,UY

ASEL,S,,,13,26,13
ASEL,A,,,35,38,3
DA,ALL,UX


ASEL,S,,,18,19,1
ASEL,A,,,31,33,1
ASEL,A,,,24,34,10
ASEL,A,,,11
DA,ALL,UZ
FINISH
allsel

/solu
antype,modal
modopt,lanb,5,0,0,,off
mxpand,5,,,yes
outpr,basic,all
outres,all,all
allsel
solve
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