刚体位移如何解决
大家好，我在做一个大型起重机械，模型做好后，静力分析可以求解。但是整机结构很大，必须考虑重力加速度影响。这时就发现了刚体位移问题the value of UY at node5 is 3.340491532E+11,It is greater than the currentlimit of 1000000.This generally indicates rigid body motion as a resultof an unconstrained model,Verify that your model is properly contrained，在论坛里看了很多，解决方法也很多，但是我还是没能解决。现在附件里是主梁的命令流，左端端面约束没有加上，自己加上就可以了。约束为两端固支也行。用板壳单元93，材料参数为e=2.01e5MP ,，泊松比0.28 ，密度7900kg/m^3.。总之，抓住主要矛盾，分析为什么出现这种情况，又怎么解决。
很着急，邮箱qiao_song01@yahoo.cnW1=2384 !上板内宽
W2=1810 !下板外宽
T1=8 !侧轨厚
T2=16 !侧板厚
T3=20 !上板厚
T4=30 !下板厚
H1=6250 !梁总高
PY=3192 !坐标偏移
LL1=2500 !双梁中段间距
LL2=1500 !15到16
LL3=1500 !16到右端内侧
LL4=1950 !右端内侧到内侧第一截面
LL5=1833 !内侧第一截面 到 第二截面
LL6=1830 !内侧第二截面 到 第三截面
LL7=1834 !内侧第三截面 到 外侧 ,LL1~LL4为右侧
LL8=1500 !第31面到左端下一面
LL9=1525 !左端内侧
LL10=1950 !左端端面 ,LL8~LL10为左侧
H2=1012 !下板高
WZN=150
WZB=200
RD=250
/PREP7
NUMSTR,KP,1001
K,1001,300.0000, 3265.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1002 , 1835.677, 3265.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1003,1705.716, 5935.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1004,300.0000, 5935.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1005,300.0000, 315.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1006,1979.267, 315.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1007,1850.280, 2965.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1008,300.0000, 2965.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1009,200.0000, -812.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1010,2095.000 ,-812.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1011,2095.000, -200.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1012,200.0000, -200.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1013,2495.000 ,-812.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1014,3889.000, -812.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1015,3889.000, -200.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1016,2495.000, -200.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1017,2579.094, 335.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1018,3804.906, 335.0000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1019,3885.901, 1999.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1020,2498.099, 1999.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1021,2483.497, 2299.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1022,3900.503 , 2299.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1023,3981.887, 3971.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1024,2402.112, 3971.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1025,2387.510, 4271.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1026 , 3996.490 , 4271.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1027,4077.484, 5935.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1028,2306.516, 5935.000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1029,0.000000, -H2 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1030,2295.000, -H2 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1031,4089.000, -H2 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1032,0.000000, 0.000000 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1033,-(W2/2-T1)+PY , ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1034,W2/2-T1+PY , ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1035,0.000000,H1-T3/2-T4/2,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1036,-(W1+T2)/2+PY,H1-T3/2-T4/2 ,-14*LL1-LL2-LL3-LL4-LL5-LL6
K,1037,(W1+T2)/2+PY,H1-T3/2-T4/2,-14*LL1-LL2-LL3-LL4-LL5-LL6
*DO,I,0,6
L,1001+4*I,1002+4*I
L,1002+4*I,1003+4*I
L,1003+4*I,1004+4*I
L,1004+4*I,1001+4*I
*ENDDO
LGEN,2,1,28 , 1, , ,100, ,0
LGEN,2,1,28 , 1, , ,-100, ,0
*DO,J,0,2
*DO,I,0,6
LFILLT,1+4*I+J*28,2+4*I+J*28,250
LFILLT,2+4*I+J*28,3+4*I+J*28,250
LFILLT,3+4*I+J*28,4+4*I+J*28,250
LFILLT,4+4*I+J*28,1+4*I+J*28,250
*ENDDO
*ENDDO
*DO,J,1,2
*DO,I,1,28
ASKIN,I,I+28*J
*ENDDO
*ENDDO
*DO,J,1,2
*DO,I,1,28
ASKIN,I+84,I+28*J+84
*ENDDO
*ENDDO
*DO,J,0,1
*DO,I,0,1
A,1029+3*J+I,1030+3*J+I,1033+3*J+I,1032+3*J+I
*ENDDO
*ENDDO
*DO,I,0,6
AL,1+4*I,85+4*I,2+4*I,86+4*I,3+4*I,87+4*I,4+4*I,88+4*I
*ENDDO
KDELE,1001,1028
*DO,I,0,1
KDELE,1038+28*I,1065+28*I
*ENDDO
ASBA,116,123
ASBA,124,122
ASBA,116,121
ASBA,113,119
ASBA,114,120
ASBA,115,117
ASBA,114,118
NUMCMP,AREA !177点，292线，116面
AGEN,2,1,116,1,,,LL6,1000 !354点，584线，232面
AGEN,2,1,116,1,,,LL6+LL5,2000
AGEN,2,1,116,1,,,LL6+LL5+LL4,3000
ASEL,S,,,365,376
ASEL,A,,,393,404
ASEL,A,,,421,432
ASEL,A,,,449,460
ASEL,A,,,464
AGEN,2,ALL,,,,,LL3,1000
ASEL,S,,,365,376
ASEL,A,,,393,404
ASEL,A,,,421,432
ASEL,A,,,449,460
ASEL,A,,,464
AGEN,2,ALL,,,,,LL3+LL2,2000
AGEN,29,514,562,1,,,LL1,1000
AGEN,2,1886,1934,1,,,LL8,1000
AGEN,2,1886,1934,1,,,LL9+LL8,2000
LL11=750
LL12=500
LL13=700
AGEN,2,1886,1934,1,,,LL9+LL8+LL11,3000
AGEN,2,1886,1934,1,,,LL9+LL8+LL11+LL12,4000
KGEN,2,4032,4035,3,,,LL3+LL2+28*LL1+LL8+LL9,32000
KGEN,2,4032,4035,3,,,LL3+LL2+28*LL1+LL8+LL9+LL11,33000
KGEN,2,4032,4035,3,,,LL3+LL2+28*LL1+LL8+LL9+LL11+LL12,34000
*DO,I,0,3,3
KGEN,2,38032+I,38034+I,1,,,LL13,1000
*ENDDO
KGEN,2,1029,1037,1,,,-LL7,-1000
ALLSEL
!生成上板
*DO,I,0,3000,1000
A,36+I,35+I,1035+I,1036+I
*ENDDO
*DO,I,0,38000,1000
A,37+I,36+I,1036+I,1037+I
*ENDDO
*DO,I,0,2000,1000
A,36036+I,36035+I,37035+I,37036+I
*ENDDO
!下板
*DO,I,0,3000,1000
A,33+I,32+I,1032+I,1033+I
*ENDDO
*DO,I,0,38000,1000
A,34+I,33+I,1033+I,1034+I
*ENDDO
*DO,I,0,2000,1000
A,36033+I,36032+I,37032+I,37033+I
*ENDDO
!外侧
*DO,I,0,38000,1000
A,34+I,37+I,1037+I,1034+I
*ENDDO
*DO,I,0,38000,1000
A,33+I,36+I,1036+I,1033+I
*ENDDO
!右端下板
*DO,J,0,2
*DO,I,0,3000,1000
A,29+I+J,1029+I+J,1032+I+J,32+I+J
*ENDDO
*ENDDO
!中间板
*DO,I,0,3000,1000
A,32+I,1032+I,1035+I,35+I
*ENDDO
!外端翼缘
KGEN,2,37,39037,1000,200,,,500
*DO,I,0,38000,1000
A,37+I,537+I,1537+I,1037+I
*ENDDO
KGEN,2,34,39034,1000,33,,,500
*DO,I,0,38000,1000
A,34+I,534+I,1534+I,1034+I
*ENDDO
!内部翼缘
KGEN,2,4036,36036,1000,-200,,,500
*DO,I,0,31000,1000
A,4036+I,5036+I,5536+I,4536+I
*ENDDO
!其他面
*DO,J,0,3,3
*DO,I,0,1
A,29+I+J,32+I+J,33+I+J,30+I+J
*ENDDO
*ENDDO
NUMMRG,ALL, , , ,LOW
NUMCMP,ALL
[ 本帖最后由 16443 于 2008-10-28 08:39 编辑 ] 把重力变为均布力。
回复 沙发 airypp 的帖子
必然不行了回复 楼主 qiao_song 的帖子
你这里只给出了模型文件，没有加载部分，没办法给你说明错误。把模型图和加载部分给出，才能有人给你解答。
解决了
密度，加速度的单位没有协调。今天想了一下，解决了 把完整的命令流贴出来，给你加威望 密度和重力加速度不协调，哈哈，我也犯了这个错误。密度设置为2600，重力加速度为9800，这确实会引起问题。
看来引起位移过大的因素的确很多。 朋友，你的刚体位移问题解决了吗？怎么弄? 路过 支持。。。。
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