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谐波载荷为作用在平台上面一点的集中力，幅值为10N，频率范围5Hz~70Hz
基本过程：
1、建模
2. 求模态解
3、用模态叠加法作谐分析
4. 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 !为了使用模态叠加法谐分析
ANTYPE,2
MODOPT,LANB,20 !先取结构前20阶模态
MXPAND,20, , ,0
MODOPT,LANB,20,0,0, ,OFF
KSEL,S,KP,,1,3
DK,ALL, , , ,0,ALL, , , , , ,
SOLVE
FINISH
!/POST1 !最好事先看一下模态结果
!SET,LIST !以了解模态频率范围
!FINISH
/SOL !模态叠加法谐响应分析
ANTYPE,3
HROPT,MSUP
HROUT,ON
HROPT,MSUP,20, ,
HROUT,ON,OFF,0
F,177,FY,-10, !施加10N的力在节点177的负Y方向
HARFRQ,5,70, !载荷的强制频率范围
NSUBST,200,
KBC,1
ALPHAD,5,
SOLVE
FINISH
/POST26 !察看位移响应
FILE,,rfrq
NUMVAR,20
NSOL,2,139,U,Y,
PLVAR,2
FINISH
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