请教：模态分析结果好像不对

对一实体进行模态分析，约束为实体底部全约束，四侧水平约束，采用子空间法求解，基频结果为104.69，请问基频的单位是HZ嘛？我看到别人算得都是2HZ左右，请问各位前辈我的命令流有何错误，谢谢了！命令如下：
finish
/cle
/PREP7
!*
ET,1,SOLID45
!*

!材料属性
MP,EX,1,5000e6
MP,PRXY,1,0.3
MP,DENS,1,2400
!*
BLOCK,-2,2,-2,2,0,4,
!*
LESIZE,all, , ,20,
MSHAPE,0,3D
MSHKEY,1
vmesh,all
allsel
finish
/SOLU
ANTYPE,MODAL
MODOPT,SUBSP,5
aSEL,S,LOC,x,-2
DA,all,UX,
aSEL,S,LOC,x,2
DA,all,UX,
aSEL,S,LOC,Y,-2
DA,all,Uy,
aSEL,S,LOC,Y,2
DA,all,Uy,
aSEL,S,LOC,z,0
DA,all,all,
allsel
MXPAND,5
SOLVE
FINISH