阶梯轴的free分网和map分网的结果为什么差异这么大？

hohoo

各位大侠，帮小弟分析一下下面的两段ansys命令，为什么对一阶梯轴用自由分网后进行模态分析的结果和用map分网对大小端分别分网，然后merge，再进行模态分析的结果差异很大？merge以后 实体是不是还是两个实体？merge以后的实体和直接建阶梯轴模型的实体有什么差别？下面是这两段命令：

hohoo

free分网命令：
/PREP7   
ET,1,PLANE42
ET,2,SOLID95
KEYOPT,1,1,0
KEYOPT,1,2,0
KEYOPT,1,3,0
KEYOPT,1,5,0
KEYOPT,1,6,0
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,DENS,1,,7800
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,EX,1,,2.01E11
MPDATA,PRXY,1,,0.3  
K,1,0,0,,   
K,2,0,0.015,,   
K,3,0.06,0.015,,   
K,4,0.06,0.005,,
K,5,0.120,0.005,,
K,6,0.120,0,,
K,7,0.06,0,,     
LSTR,       1,       2  
LSTR,       2,       3  
LSTR,       4,       5  
LSTR,       5,       6  
LSTR,       6,       7  
LSTR,       7,       1  
LSTR,       3,       7  
LSTR,       4,       7
APLOT   
FLST,2,7,3  
FITEM,2,1   
FITEM,2,2   
FITEM,2,3   
FITEM,2,4   
FITEM,2,5   
FITEM,2,6   
FITEM,2,7   
A,P51X  
FLST,2,1,5,ORDE,1   
FITEM,2,1   
FLST,8,2,3  
FITEM,8,1   
FITEM,8,6   
VROTAT,P51X, , , , , ,P51X, ,180,3,
/REP,FAST   
TYPE,   2   
MAT,       1
REAL,   
ESYS,       0   
SECNUM,
ESIZE,0.005,0,  
MSHAPE,1,3D
MSHKEY,0
FLST,5,3,6,ORDE,2   
FITEM,5,1   
FITEM,5,-3  
CM,_Y,VOLU  
VSEL, , , ,P51X
CM,_Y1,VOLU
CHKMSH,'VOLU'   
CMSEL,S,_Y  
VMESH,_Y1   
CMDELE,_Y   
CMDELE,_Y1  
CMDELE,_Y2  
FINISH  
/SOL
ANTYPE,2
MSAVE,0
MODOPT,LANB,10  
EQSLV,SPAR  
MXPAND,10, , ,0
LUMPM,0
PSTRES,0
MODOPT,LANB,10,1000,40000, ,OFF
/STATUS,SOLU
SOLVE   
FINISH  

map分网命令：
/PREP7   
ET,1,PLANE42
ET,2,SOLID95
KEYOPT,1,1,0
KEYOPT,1,2,0
KEYOPT,1,3,0
KEYOPT,1,5,0
KEYOPT,1,6,0
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,DENS,1,,7800
MPTEMP,,,,,,,,  
MPTEMP,1,0  
MPDATA,EX,1,,2.01E11
MPDATA,PRXY,1,,0.3  
K,1,0,0,,   
K,2,0,0.015,,   
K,3,0.06,0.015,,   
K,4,0.06,0.005,,
K,5,0.120,0.005,,
K,6,0.120,0,,
K,7,0.06,0,,  
FLST,2,4,3  
FITEM,2,1   
FITEM,2,2   
FITEM,2,3   
FITEM,2,7   
A,P51X  
FLST,2,4,3  
FITEM,2,4   
FITEM,2,5   
FITEM,2,6   
FITEM,2,7   
A,P51X  
LPLOT   
FLST,5,4,4,ORDE,4   
FITEM,5,2   
FITEM,5,4   
FITEM,5,-5  
FITEM,5,7   
CM,_Y,LINE  
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y   
LESIZE,_Y1, , ,8, , , , ,1  
FLST,5,2,4,ORDE,2   
FITEM,5,1   
FITEM,5,3   
CM,_Y,LINE  
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y   
LESIZE,_Y1, , ,9, , , , ,1  
FLST,5,2,4,ORDE,2   
FITEM,5,6   
FITEM,5,8   
CM,_Y,LINE  
LSEL, , , ,P51X
CM,_Y1,LINE
CMSEL,,_Y   
LESIZE,_Y1, , ,3, , , , ,1   
MSHAPE,0,2D
MSHKEY,0
FLST,5,2,5,ORDE,2   
FITEM,5,1   
FITEM,5,-2  
CM,_Y,AREA  
ASEL, , , ,P51X
CM,_Y1,AREA
CHKMSH,'AREA'   
CMSEL,S,_Y   
AMESH,_Y1   
CMDELE,_Y   
CMDELE,_Y1  
CMDELE,_Y2   
TYPE,   2   
MAT,       1
REAL,   
ESYS,       0   
SECNUM,  
ESIZE,0,6,  
FLST,2,2,5,ORDE,2   
FITEM,2,1   
FITEM,2,-2  
FLST,8,2,3  
FITEM,8,1   
FITEM,8,6   
VROTAT,P51X, , , , , ,P51X, ,180,3,
NUMMRG,ALL, , , ,LOW
FINISH  
/SOL
ANTYPE,2
MSAVE,0
MODOPT,LANB,10  
EQSLV,SPAR  
MXPAND,10, , ,0
LUMPM,0
PSTRES,0
MODOPT,LANB,10,1000,40000, ,OFF
/STATUS,SOLU
SOLVE   
FINISH

hohoo

怎么没人回答？斑竹在吗？

hohoo

怎么没有人回答呀？yymaverick和foransys两位版主在吗？

hohoo

help me! ban zhu!

wishangtian

你的命令流是GUI产生的，有的要用鼠标点的，不知道点那几个实体啊。

hohoo

抱歉！我对apdl命令不太熟悉，麻烦就随便用一个阶梯轴做一下mappped 和free分网，看模态分析的结果是不是一样？谢谢了！