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[求助]
能给看看吗,ansys 算的模态分析频率总是零，，谢谢各位了
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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 梁 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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