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基本过程：
1、建模
2、求模态解
3、求谱解
4、扩展模态
5、模态合并
6、观察结果
/PREP7 !建模
ET,1,BEAM189
ET,2,SHELL93
R,1,0.01, , , , , ,
MP,EX,1,210e9
MP,PRXY,1,0.3
MP,DENS,1,7850
SECTYPE, 1, BEAM, RECT, secA, 0
SECOFFSET, CENT
SECDATA,0.005,0.008,0,0,0,0,0,0,0,0
K, ,-0.5,,,
K, ,0.5,,,
K, ,,,1,
K, ,,1,1,
K, ,-0.5,1,,
K, ,0.5,1,,
K, ,,,0.5,
A,4,5,6
LSTR, 1, 5
LSTR, 3, 4
LSTR, 2, 6
LSEL,S,LINE,,4,6
LATT,1,1,1, , 7, ,1
LSEL, , , ,ALL
LESIZE,ALL, , ,10, , , , ,1
LMESH,4,6
TYPE, 2
MSHAPE,0,2D
MSHKEY,1
AMESH,1
FINISH
/SOL !取前十阶模态
ANTYPE,2
MODOPT,LANB,10
KSEL,S,KP,,1,3
DK,ALL, , , ,0,ALL, , , , , ,
SOLVE
FINISH
/SOL !谱分析
ANTYPE,8
SPOPT,SPRS,10,1
SVTYP,3
SED,0,1,0, !给出激励方向
FREQ,0.25,1.34,6.73,14.6,28.9,0,0,0,0 !激励谱
SV,0,0.00073,0.00016,0.00034,0.00034,0.00052,
SOLVE
FINISH
/SOL !扩展模态
ANTYPE,2
EXPASS,1
MXPAND,10,0,0,1,0.001,
SOLVE
FINISH
/SOL !模态合并
ANTYPE,8
SRSS,0.001,DISP
SOLVE
/POST1 !观察结果
SET,LIST
/INPUT,,mcom
PRRSOL,F
FINISH
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