电主轴模态前两阶频率过低问题
不知道为什么前两阶频率很低，而且改变弹簧刚度，前两阶频率不变。请指教，谢谢！命令流如下：/PREP7
!*
ET,1,BEAM188
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ET,2,COMBI214
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MPTEMP,,,,,,,,
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MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,DENS,1,,7850
R,1,5E7,5E7, , , , ,
RMORE, , ,
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N,1,,,,,,,
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N,8,0.0625,,,,,,
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NPLOT
NPLOT
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/PNUM,ELEM,0
/REPLOT
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E,P51X
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TSHAP,LINE
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E,P51X
TYPE, 1
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TSHAP,LINE
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FLST,2,2,1
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E,P51X
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TSHAP,LINE
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E,P51X
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E,P51X
TYPE, 1
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TSHAP,LINE
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FLST,2,2,1
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E,P51X
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E,P51X
TYPE, 1
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TSHAP,LINE
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FLST,2,2,1
FITEM,2,8
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E,P51X
TYPE, 1
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ESYS, 0
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TSHAP,LINE
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FLST,2,2,1
FITEM,2,9
FITEM,2,10
E,P51X
TYPE, 1
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TSHAP,LINE
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FLST,2,2,1
FITEM,2,10
FITEM,2,11
E,P51X
TYPE, 1
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REAL, 1
ESYS, 0
SECNUM, 9
TSHAP,LINE
!*
FLST,2,2,1
FITEM,2,11
FITEM,2,12
E,P51X
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,10
TSHAP,LINE
!*
FLST,2,2,1
FITEM,2,12
FITEM,2,13
E,P51X
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,11
TSHAP,LINE
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FLST,2,2,1
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E,P51X
FLST,2,2,1
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E,P51X
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E,P51X
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E,P51X
/DIST,1,1.37174211248,1
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E,P51X
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E,P51X
FLST,2,2,1
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E,P51X
TYPE, 1
MAT, 1
REAL, 1
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TSHAP,LINE
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E,P51X
FLST,2,2,1
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E,P51X
FLST,2,2,1
FITEM,2,22
FITEM,2,23
E,P51X
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
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TSHAP,LINE
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FLST,2,2,1
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FITEM,2,24
E,P51X
TYPE, 1
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SECNUM,14
TSHAP,LINE
!*
FLST,2,2,1
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E,P51X
FLST,2,2,1
FITEM,2,25
FITEM,2,26
E,P51X
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,15
TSHAP,LINE
!*
FLST,2,2,1
FITEM,2,26
FITEM,2,27
E,P51X
FLST,2,2,1
FITEM,2,27
FITEM,2,28
E,P51X
/AUTO,1
/REP,FAST
TYPE, 1
MAT, 1
REAL, 1
ESYS, 0
SECNUM,16
TSHAP,LINE
!*
FLST,2,2,1
FITEM,2,28
FITEM,2,29
E,P51X
N,101,0.037,0.036,,,,,
N,103,0.059,0.036,,,,,
N,104,0.276,0.034,,,,,
N,105,0.298,0.034,,,,,
TYPE, 2
MAT, 1
REAL, 1
ESYS, 0
SECNUM, ,
TSHAP,LINE
!*
FLST,2,2,1
FITEM,2,5
FITEM,2,101
E,P51X
FLST,2,2,1
FITEM,2,7
FITEM,2,103
E,P51X
FLST,2,2,1
FITEM,2,25
FITEM,2,104
E,P51X
FLST,2,2,1
FITEM,2,27
FITEM,2,105
E,P51X
/AUTO,1
/REP,FAST
FINISH
/SOL
FLST,2,4,1,ORDE,3
FITEM,2,101
FITEM,2,103
FITEM,2,-105
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/GO
D,P51X, , , , , ,ALL, , , , ,
FLST,2,34,1,ORDE,4
FITEM,2,1
FITEM,2,-29
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FITEM,2,-105
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/GO
D,P51X, , , , , ,UX,ROTX, , , ,
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ANTYPE,2
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MODOPT,LANB,20
EQSLV,SPAR
MXPAND,20, , ,0
LUMPM,0
PSTRES,0
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MODOPT,LANB,20,0,0, ,OFF
/STATUS,SOLU
SOLVE
FINISH
/POST1
SET,LIST
SET,LIST
SAVE
FINISH
! /EXIT,ALL
软件是ANSYS APDL 17.0 没有看到轴承设置在哪里，很多是鼠标点击生成的，可读性较差。
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