模态分析不收敛，得不到频率（附命令流）

hongzheli

*** WARNING ***                         CP =      91.516   TIME= 10:45:21
Repeated Lanczos shift and factorize steps did not yield additional     
eigenvalues in the requested frequency range.  Either the eigenvalues   
are widely separated or, there are only 0 eigenvalues in the frequency  
range specified (FREQB and FREQE in MODOPT command).   

*** WARNING ***                         CP =      91.531   TIME= 10:45:21
There are no modes in the specified range.   


采用函数定义了一个变厚度的箱梁，模态分析时，显示以上错误，以前没有碰到过，请大家帮忙看看怎么回事。



!!!!变厚度箱梁

FINI
/CLEAR
/FILNAME, boxbeam
/TITLE,Model Analysis  
/units,MPA
/PNUM,KP,1
/PNUM,LINE,1
/pnum,area,1　
/PREP7

　　ET,1,SHELL181
　　MP,EX,1,34.5e3
　　MP,PRXY,1,0.16
    MP,DENS,1,2.4e-9
    MP,DAMP,1,0.005
    k,1,0,0,0
　　k,2,0,3350,0
　　k,3,0,6000,0
　　k,4,0,2750,3078
　　k,5,0,0,3078
    k,6,1500,0,0
　　k,7,1500,3350,0
　　k,8,1500,6000,0
　　k,9,1500,2750,3078
　　k,10,1500,0,3078
    k,11,1500+3000,0,0
　　k,12,1500+3000,3350,0
　　k,13,1500+3000,6000,0
　　k,14,1500+3000,2750,3078
　　k,15,1500+3000,0,3078
    k,16,1500+3000+11800,0,0
　　k,17,1500+3000+11800,3350,0
　　k,18,1500+3000+11800,6000,0
　　k,19,1500+3000+11800,2750,3078
　　k,20,1500+3000+11800,0,3078
    A,1,2,7,6
    A,2,3,8,7
    A,2,7,9,4
    A,5,4,9,10
A,6,7,12,11
A,7,8,13,12
A,7,12,14,9
A,10,9,14,15
A,6+5,7+5,12+5,11+5
A,7+5,8+5,13+5,12+5
A,7+5,12+5,14+5,9+5
A,10+5,9+5,14+5,15+5

!!!!!X方向线
lsel,s,line,,2,6,2  
lesize,all,,,3
lsel,s,line,,9,13,4
lesize,all,,,3
lsel,s,line,,16,17,1
lesize,all,,,6
lsel,s,line,,20,22,2
lesize,all,,,6
allsel
lesize,14,,,6
lsel,s,line,,25,26,1
lesize,all,,,24
lsel,s,line,,29,31,2
lesize,all,,,24
allsel
lesize,23,,,24

!!!!沿Y方向!!!!!!
lsel,s,line,,1,3,2  
lesize,all,,,10
lsel,s,line,,15,24,9  
lesize,all,,,10
lsel,s,line,,11,12,1
lesize,all,,,8
lsel,s,line,,21,30,9  
lesize,all,,,8
lsel,s,line,,5,7,2  
lesize,all,,,8  
lsel,s,line,,18,27,9  
lesize,all,,,8

lsel,s,line,,8,10   
lesize,all,,,9
lsel,s,line,,19,28,9   
lesize,all,,,9

type,1

!!!上板!!!!!
secn,1
*DEL,Z1
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z1'  
*SET,_FNCCSYS,0
! /INPUT,thick1.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 694-(694-384)*({X}-1500)/3000  
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 694, 0, 0, 0
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 384, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 694, 0, 0, -3   
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 694-(694-384)*({X}-1500)/3000
ASEL,S,area,,5
NSLA,S,1
sectype,1,shell
secfunction,%Z1%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,0,1  
amesh,5

!!!侧板!!!!!
secn,2
*DEL,Z2
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z2'  
*SET,_FNCCSYS,0
! /INPUT,thick2.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 1050-(1050-450)*({X}-1500)/3000
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 1050, 0, 0, 0   
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 450, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 1050, 0, 0, -3  
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 1050-(1050-450)*({X}-1500)/3000  

ASEL,S,area, ,7
NSLA,S,1
sectype,2,shell
secfunction,%Z2%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,0,2
amesh,7

!!!底板!!!!!
secn,3
*DEL,Z3
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z3'  
*SET,_FNCCSYS,0
! /INPUT,thick3.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 700-(700-280)*({X}-1500)/3000  
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 700, 0, 0, 0
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 280, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 700, 0, 0, -3   
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 700-(700-280)*({X}-1500)/3000
ASEL,S,area, , 8
NSLA,S,1
sectype,3,shell
secfunction,%Z3%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,0,3  
amesh,8

!!!翼板!!!!!1
secn,4
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z4'  
*SET,_FNCCSYS,0
! /INPUT,thick4.func,,,1
*DIM,%_FNCNAME%,TABLE,6,9,1,,,,%_FNCCSYS%   
!   
! Begin of equation: 678-({Y}-3350)*394/2650
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 3350, 0, 0, 3   
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 1, 3, 2, -1
*SET,%_FNCNAME%(0,3,1),   0, -1, 0, 394, 0, 0, -2   
*SET,%_FNCNAME%(0,4,1), 0.0, -3, 0, 1, -2, 3, -1
*SET,%_FNCNAME%(0,5,1), 0.0, -1, 0, 2650, 0, 0, -3  
*SET,%_FNCNAME%(0,6,1), 0.0, -2, 0, 1, -3, 4, -1
*SET,%_FNCNAME%(0,7,1), 0.0, -1, 0, 678, 0, 0, -2   
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,9,1), 0.0, 99, 0, 1, -3, 0, 0
! End of equation: 678-({Y}-3350)*394/2650
ASEL,S,area, ,2
ASEL,A,area, ,6
ASEL,A,area, ,10
NSLA,S,0

sectype,4,shell
secfunction,%Z4%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,0,4
amesh,ALL

!!!!!定厚度部分分网
!!!上板1!!!!!
SECN,5
ASEL,S,AREA,,1
sectype,5,shell
secdata,694
!secoffset,top
aatt,1,1,1,0,5  
amesh,1

!!!侧板1!!!!!
SECN,6
ASEL,S,AREA,,3
sectype,6,shell
secdata,1050
!secoffset,top
aatt,1,1,1,0,6  
amesh,3
!!!下板1!!!!!
SECN,7
ASEL,S,AREA,,4
sectype,7,shell
secdata,700
!secoffset,top
aatt,1,1,1,0,7  
amesh,4
!!!上板2!!!!!
SECN,8
ASEL,s,AREA,,9
sectype,8,shell
secdata,384
!secoffset,top
aatt,1,1,1,0,8  
amesh,9
!!!侧板2!!!!!
SECN,9
ASEL,s,AREA,,11
sectype,9,shell
secdata,450
!secoffset,top
aatt,1,1,1,0,9  
amesh,11
!!!下板2!!!!!
SECN,10
ASEL,s,AREA,,12
sectype,10,shell
secdata,280
!secoffset,top
aatt,1,1,1,0,10  
amesh,12

!!!!!!对称复制!!!!!
allsel
ASEL,U,area, ,2,10,4
ARSYM,Y,all, , , ,0,0  
ASEL,s,area, ,2,10,4
ARSYM,Y,all, , , ,1,0  
allsel
ASEL,U,area, ,22,24,1
ASEL,u,area, ,16,18,1
ASEL,u,area, ,7,8,1
ASEL,u,area, ,5,
LOCAL,12,0,16300  
ARSYM,X,all, , , ,0,0  
allsel
ASEL,s,area, ,22,24,1
ASEL,a,area, ,16,18,1
ASEL,a,area, ,7,8,1
ASEL,a,area, ,5,
csys,12
ARSYM,X,all, , , ,1,0  

!!!!!!变厚度部分分网
!!!!翼源部分
LOCAL,13,0,0,,,,180

secn,11
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z5'  
*SET,_FNCCSYS,13
! /INPUT,thick4.func,,,1
*DIM,%_FNCNAME%,TABLE,6,9,1,,,,%_FNCCSYS%   
!   
! Begin of equation: 678-({Y}-3350)*394/2650
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 3350, 0, 0, 3   
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 1, 3, 2, -1
*SET,%_FNCNAME%(0,3,1),   0, -1, 0, 394, 0, 0, -2   
*SET,%_FNCNAME%(0,4,1), 0.0, -3, 0, 1, -2, 3, -1
*SET,%_FNCNAME%(0,5,1), 0.0, -1, 0, 2650, 0, 0, -3  
*SET,%_FNCNAME%(0,6,1), 0.0, -2, 0, 1, -3, 4, -1
*SET,%_FNCNAME%(0,7,1), 0.0, -1, 0, 678, 0, 0, -2   
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,9,1), 0.0, 99, 0, 1, -3, 0, 0
! End of equation: 678-({Y}-3350)*394/2650
ASEL,S,area, ,22,24
ASEL,A,area, ,46,48
NSLA,S,0

sectype,11,shell
secfunction,%Z5%
!secdata,0.9
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,13,11
amesh,all

!!!!!主体部分
!!!!上板
LOCAL,14,0,32600,,,180
secn,12
*DEL,Z6
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z6'  
*SET,_FNCCSYS,14
! /INPUT,thick1.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 694-(694-384)*({X}-1500)/3000  
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 694, 0, 0, 0
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 384, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 694, 0, 0, -3   
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 694-(694-384)*({X}-1500)/3000
ASEL,S,area,,40,43,3
NSLA,S,1
sectype,12,shell
secfunction,%Z6%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,14,12  
amesh,all

!!!!!侧板
secn,13
*DEL,Z7
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z7'  
*SET,_FNCCSYS,14
! /INPUT,thick2.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 1050-(1050-450)*({X}-1500)/3000
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 1050, 0, 0, 0   
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 450, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 1050, 0, 0, -3  
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 1050-(1050-450)*({X}-1500)/3000  

ASEL,S,area, ,41,44,3
NSLA,S,1
sectype,13,shell
secfunction,%Z7%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,14,13  
amesh,all

!!!底板
secn,14
*DEL,Z8
*DEL,_FNCNAME   
*DEL,_FNCMTID   
*DEL,_FNCCSYS   
*SET,_FNCNAME,'Z8'  
*SET,_FNCCSYS,14
! /INPUT,thick3.func,,,1
*DIM,%_FNCNAME%,TABLE,6,11,1,,,,%_FNCCSYS%  
!   
! Begin of equation: 700-(700-280)*({X}-1500)/3000  
*SET,%_FNCNAME%(0,0,1), 0.0, -999   
*SET,%_FNCNAME%(2,0,1), 0.0
*SET,%_FNCNAME%(3,0,1), 0.0
*SET,%_FNCNAME%(4,0,1), 0.0
*SET,%_FNCNAME%(5,0,1), 0.0
*SET,%_FNCNAME%(6,0,1), 0.0
*SET,%_FNCNAME%(0,1,1), 1.0, -1, 0, 700, 0, 0, 0
*SET,%_FNCNAME%(0,2,1), 0.0, -2, 0, 280, 0, 0, -1   
*SET,%_FNCNAME%(0,3,1),   0, -3, 0, 1, -1, 2, -2
*SET,%_FNCNAME%(0,4,1), 0.0, -1, 0, 1500, 0, 0, 2   
*SET,%_FNCNAME%(0,5,1), 0.0, -2, 0, 1, 2, 2, -1
*SET,%_FNCNAME%(0,6,1), 0.0, -1, 0, 1, -3, 3, -2
*SET,%_FNCNAME%(0,7,1), 0.0, -2, 0, 3000, 0, 0, -1  
*SET,%_FNCNAME%(0,8,1), 0.0, -3, 0, 1, -1, 4, -2
*SET,%_FNCNAME%(0,9,1), 0.0, -1, 0, 700, 0, 0, -3   
*SET,%_FNCNAME%(0,10,1), 0.0, -2, 0, 1, -1, 2, -3   
*SET,%_FNCNAME%(0,11,1), 0.0, 99, 0, 1, -2, 0, 0
! End of equation: 700-(700-280)*({X}-1500)/3000
ASEL,S,area, ,42,45,3
NSLA,S,1
sectype,14,shell
secfunction,%Z8%
!secoffset,top
/ESHAPE,1,0
aatt,1,1,1,14,14  
amesh,all
allsel
csys,0
nummrg,node
nummrg,kp
eplot
/eshape,0,0
!!!!约束!!!!!!!
/solu
NSEL,S,LOC,X,0,50
NSEL,R,LOC,Z,3070,3080
D,ALL,ALL,0

NSEL,S,LOC,X,32550,32600
NSEL,R,LOC,Z,3070,3080
D,ALL,UZ,0
D,ALL,UY,0

ALLSEL

ACEL,0,0,9.8

/solu
antype,modal   
modopt,lanb,20
mxpand,20,0,1000,
allsel
solve
save
fini

312893968

我也出现了楼主同样的问题啊,希望高手给指点下啊,还有mxpand,20,0,1000,设置后面的1000是干啥用的呢

312893968

再补充下我是先做的静力分析,施加重力加速度后,找行,然后就是做模态分析,我的命令流是/solu
antype,modal
nlgeom,off   
modopt,lanb,6
mxpand,6,
solve
fini
为什么也出现了楼主一样的错误提示而且 要经过3个小时的运算才提示solution is  done
而且最终还得不到频率!希望高手们给予指点啊!!谢谢了 啊!!

312893968

希望 知道的帮忙解答下啊，版本们帮帮忙啊，不要让帖子沉下去了啊！！

kevin210099

2# 312893968
模態擴展數為20,頻率為0~10000