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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.cn- W1=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 ] |
发表于 2008-10-27 16:27
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