夹层结构振动模态及阻尼分析
我做的频率
*****INDEX OF DATA SETS ON RESULTS FILE*****
SET TIME/FREQ LOAD STEP SUBSTEPCUMULATIVE
180.769 1 1 1
2146.44 1 2 2
3228.95 1 3 3
4252.99 1 4 4
5300.62 1 5 5
6404.11 1 6 6
7419.99 1 7 7
8483.93 1 8 8
9568.42 1 9 9
10590.32 1 10 10
最近用ANSYS分析夹层梁的模态和阻尼，照上面的例子做的下面是命令流，没在模型中加中间夹层的损耗因子（不知道算是哪个阻尼）。采用三边约束Y方向，一边全约束，block lanczos法分析的模态，为什麽频率差别较大，错在哪些地方，哪位专家给点指导呀
/BATCH
/COM,ANSYS RELEASE 10.0 UP20050718 13:51:54 12/19/2012
/PREP7
!*
ET,1,SOLID45
!*
!*
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,7e10
MPDATA,PRXY,1,,0.33
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,2700
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,2,,1.7241e6
MPDATA,PRXY,2,,0.45
MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,2,,1000
BLOCK,0,0.5,0,0.002,0,0.3,
BLOCK,0,0.5,0.002,0.005,0,0.3,
BLOCK,0,0.5,0.005,0.007,0,0.3,
/VIEW,1,1,1,1
/ANG,1
/REP,FAST
FLST,2,3,6,ORDE,2
FITEM,2,1
FITEM,2,-3
VGLUE,P51X
/VIEW,1,,,1
/ANG,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
FLST,5,2,6,ORDE,2
FITEM,5,1
FITEM,5,5
CM,_Y,VOLU
VSEL, , , ,P51X
CM,_Y1,VOLU
CMSEL,S,_Y
!*
CMSEL,S,_Y1
VATT, 1, , 1, 0
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
CM,_Y,VOLU
VSEL, , , , 4
CM,_Y1,VOLU
CMSEL,S,_Y
!*
CMSEL,S,_Y1
VATT, 2, , 1, 0
CMSEL,S,_Y
CMDELE,_Y
CMDELE,_Y1
!*
/VIEW,1,1,1,1
/ANG,1
/REP,FAST
/AUTO,1
/REP,FAST
FLST,5,28,4,ORDE,10
FITEM,5,1
FITEM,5,-12
FITEM,5,14
FITEM,5,19
FITEM,5,23
FITEM,5,-24
FITEM,5,26
FITEM,5,31
FITEM,5,35
FITEM,5,-44
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1,0.001, , , , , , ,1
!*
LPLOT
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
/DIST,1,0.924021086472,1
/REP,FAST
FLST,5,4,4,ORDE,4
FITEM,5,2
FITEM,5,4
FITEM,5,14
FITEM,5,26
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,20, , , , ,1
!*
FLST,5,4,4,ORDE,4
FITEM,5,9
FITEM,5,12
FITEM,5,24
FITEM,5,36
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,20, , , , ,1
!*
FLST,5,4,4,ORDE,4
FITEM,5,5
FITEM,5,7
FITEM,5,19
FITEM,5,31
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,20, , , , ,1
!*
FLST,5,4,4,ORDE,4
FITEM,5,10
FITEM,5,-11
FITEM,5,23
FITEM,5,35
CM,_Y,LINE
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y
!*
LESIZE,_Y1, , ,20, , , , ,1
!*
VPLOT
FLST,5,3,6,ORDE,3
FITEM,5,1
FITEM,5,4
FITEM,5,-5
CM,_Y,VOLU
VSEL, , , ,P51X
CM,_Y1,VOLU
CHKMSH,'VOLU'
CMSEL,S,_Y
!*
VSWEEP,_Y1
!*
CMDELE,_Y
CMDELE,_Y1
CMDELE,_Y2
!*
/UI,MESH,OFF
/DIST,1,1.08222638492,1
/REP,FAST
/DIST,1,1.08222638492,1
/REP,FAST
/DIST,1,1.08222638492,1
/REP,FAST
FINISH
/SOL
!*
ANTYPE,2
!*
MSAVE,0
!*
MODOPT,LANB,10
EQSLV,SPAR
MXPAND,10, , ,1
LUMPM,0
PSTRES,0
!*
MODOPT,LANB,10,0,0, ,OFF
!*
OUTPR,ALL,ALL,
!*
OUTRES,ALL,ALL,
ASEL,S,LOC,X,0
APLOT
ASEL,S,LOC,X,0
FLST,2,3,5,ORDE,3
FITEM,2,5
FITEM,2,22
FITEM,2,26
!*
/GO
DA,P51X,ALL,
ALLSEL,ALL
ASEL,S,LOC,Z,0
APLOT
ASEL,S,LOC,Z,0
FLST,2,3,5,ORDE,3
FITEM,2,1
FITEM,2,19
FITEM,2,23
!*
/GO
DA,P51X,UY,
ALLSEL,ALL
ASEL,S,LOC,Z,0.3
APLOT
ASEL,S,LOC,Z,0.3
FLST,2,3,5,ORDE,3
FITEM,2,2
FITEM,2,20
FITEM,2,24
!*
/GO
DA,P51X,UY,
ALLSEL,ALL
ASEL,S,LOC,X,0.5
APLOT
ASEL,S,LOC,X,0.5
FLST,2,3,5,ORDE,3
FITEM,2,6
FITEM,2,21
FITEM,2,25
!*
/GO
DA,P51X,UY,
ALLSEL,ALL
APLOT
/DIST,1,1.08222638492,1
/REP,FAST
/STATUS,SOLU
SOLVE
FINISH
/POST1
SET,LIST,999
SET,LIST,2
尤其是高阶模态差距更大了{:4_64:} 网格划分厚度方向1毫米，长宽都是划分20份
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