关于ANSYS中,响应幅值与激励频率无关的问题?
ansys做spectrum analysis时,出现的问题:在同样幅度下，无论如何改动freq命令指定的激振频率范围和大小，响应输出的结果均没有变化,不符合激励频率接近固有频率时受迫振动响应增加的理论。请问各位大侠是什么原因. 谢谢附加命令流为:
/PREP7
ET,1,BEAM3
R,1,273.9726,(1000/3),14 ! A = 273.9726, I = (1000/3), H = 14
MP,EX,1,30E6
MP,DENS,1,73E-5
K,1
K,2,240
L,1,2
ESIZE,,8
LMESH,1
NSEL,S,LOC,X,0
D,ALL,UY
NSEL,S,LOC,X,240
D,ALL,UX,,,,,UY
NSEL,ALL
FINISH
!!!模态求解，获取自身频率
/SOLU
ANTYPE,MODAL
MODOPT,REDUC,,,,15
MXPAND,15,,,YES
M,ALL,UY
OUTPR,BASIC,1
SOLVE
FINISH
!!!谱分析
/SOLU
ANTYPE,SPECTR
SPOPT,SPRS
SED,,1
SVTYPE,3
FREQ,1,4
SV,,.44,.44
SOLVE
FINISH
!!!模态扩展，获得应力，扩展前15阶应力
/SOLU
ANTYPE,MODAL
EXPASS,ON
MXPAND,15,,,YES,0.0
SOLVE
FINISH
!!!模态合并，获得结果
/SOLU
ANTYPE,SPECTR
SRSS,0.0,DISP
SOLVE
FINISH
!!!后处理，提取分析结果
/POST1
SET,LIST
/INP,,mcom
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