ANSYS VM86自己做的结果对应不起来

最近在学ANSYS谐响应分析，按照VM86实例，可是得到的结果就不一样了，请大家帮我看看。
实际得到频率为3.1831时，振幅为：0.0833；可是我按照如下命令流做的结果是 3.1831 时振幅 69917.5 相位 -90.0000
/PREP7
ET,1,COMBIN40
KEYOPT,1,1,0
KEYOPT,1,3,3
KEYOPT,1,4,0
KEYOPT,1,6,2
R,1,200,6,0.5, , , ,
N,1,,,,,,,
N,2,,,1,,,,
/VIEW,1,,-1
/ANG,1
/REP,FAST
FLST,2,2,1
FITEM,2,1
FITEM,2,2
E,P51X
FINISH
/SOL
ANTYPE,2
MODOPT,LANB,2
EQSLV,SPAR
MXPAND,2, , ,0
LUMPM,0
PSTRES,0
MODOPT,LANB,2,0,0, ,OFF
FLST,2,1,1,ORDE,1
FITEM,2,1
/GO
D,P51X, , , , , ,ALL, , , , ,
/STATUS,SOLU
SOLVE
FINISH
/POST1
SET,LIST
FINISH
/SOL
ANTYPE,3
HROPT,MSUP, , ,0
HROUT,ON
LUMPM,0
HROPT,MSUP,2, ,0
HROUT,ON,OFF,0
FLST,2,1,1,ORDE,1
FITEM,2,2
/GO
F,P51X,FZ,0,10
OUTPR,BASIC,ALL,
HARFRQ,0,3.1831,
NSUBST,10,
KBC,1
/STATUS,SOLU
SOLVE
FINISH
大家帮我看看捉急