patrannastran教程第8章频率响应分析

第八 概阻尼（VISC,DAMP定义），使用低效率得直接频响法（对小的模态坐标矩阵）。DLOAD2）3)由DLOAD=SID.FREQ1定义fSTARTFREQ2定义fSTART,fend定义FREQ3,FREQ4,FREQ5FREQ,FREQ1,FREQ2,FREQ3,FREQ4和FREQ5FREQ8.4.3.28.4.3.2FREQ1fi=F1+DF*(i-单位：cyclesperunit单位：cyclesperunittime)例子=CBUSHSAMPLEUSINGCBUSH$$$TITLE=VERIFICATIONPROBLEM,FREQ.DEP.IMPEDANCEBUSHVERSUBTITLE=SINGLEDOF,CRITICALDAM ,3EXCITATIONFREQUENCIESECHO=BOTHSPC=DLOAD=1DISP=ALLFREQ=10ELFO=ALL$CONVENTIONALINPUTFORMOUNTGRDSET,,,,,,,23456$PS$TIEDOWNEVERYTHINGBUTTHE1DOFGRID,11,,0.,0.,0.0$GROUND=,12,=,=,=,,$ISOLATEDDOFSPC1,100212345611$CONM2,12,12,,1.0$THEISOLATED$$EIDPIDGAGBGO/X1X2X3$CBUSH100020001112$PBUSH2000KB$PBUSHT2000KB$,0.90.81,1.0,1.0,1.1,1.21ENDTTABLED12002$DAMTABLE,0.9 ,1.0,.318309, $CONVENTIONALINPUTFORFREQUENCYRESPONSEPARAM,WTMASS,. $1/(2*PI)**2.GIVESFN=1.0DAREA,1,12,1,2.$CAUSESUNITDEFLECTIONFREQ,10,0.9,1.0,1.1$BRACKETTHENATURALRLOAD1,1,1,,,TABLED1,3$TABLE VS.,0.9,0.81,1.,1.,1.1,1.21,ENDT$P=K,INPUTFILEFORPROBLEMTITLE=FREQUENCYRESPONSEDUETOUNITATTIPECHO=UNSORTEDSPC=SET111=11,33, CEMENT(SORT2,PHASE)=111SUBCASE1DLOAD=FREQUENCY=$$YTLOG=YESYBLOG=NOYTTITLE=DISCEMENTRESPONSEATLOADEDCORNER,MAGNITUDEYBTITLE=DISCEMENTRESPONSEATLOADEDCORNER,PHASEXYPLOTDISPRESPONSE/11(T3RM,T3IP)YTTITLE=DIS CEMENTRESPONSEATTIPCENTER,MAGNITUDEYBTITLE=DIS CEMENTRESPONSEATTIPCENTER,PHASEXYPLOTDISPRESPONSE/33(T3RM,T3IP)YTTITLE=DIS CEMENTRESPONSEATOPPOSITECORNER,MAGNITUDEYBTITLE=DIS CEMENTRESPONSEATOPPOSITECORNER,PHASEXYPLOTDISPRESPONSE/55(T3RM,T3IP)$BEGIN$ TEMODELDESCRIBEDINNORMALMODES$INCLUDE’$$PARAM,G,$$APPLYUNITATTIP$RLOAD2,500,600,,$DAREA,600,11,3,$,0.,1.,1000.,1.,$$FREQ1,100,20.,20.,0.03，频率范围20HZ~1000HZ,间隔20HZ.每点取5个频率点。INPUTFILEFORPROBLEMIDSEMINAR,PROB6SOL111TITLE=FREQUENCYRESPONSEWITHPRESSUREANDPOINTLOADSECHO=UNSORTEDSPC=1SET111=11,33,55METHOD=100FREQUENCY=SDAM=SUBCASEDLOAD=LOADSET= UT =YESYTGRID=YESXBGRID=YESYBGRID=YESYBLOG=XTITLE=FREQUENCYYTTITLE=DISCEMENTRESPONSEATLOADEDCORNER,MAGNITUDEYBTITLE=DISCEMENTRESPONSEATLOADEDCORNER,PHASE YTTITLE=DISCEMENTRESPONSEATTIPCENTER,MAGNITUDEYBTITLE=DIS CEMENTRESPONSEATTIPCENTER,PHASE YTTITLE=DIS CEMENTRESPONSEATOPPOSITECORNER,MAGNITUDEYBTITLE=DIS CEMENTRESPONSEATOPPOSITECORNER,PHASEXYPLOTDISPRESPONSE/55(T3RM,T3IP) NBULKPARAM,WTMASS,$$PARAMETERSFORPOST-$ TEMODELDESCRIBEDINNORMALMODES E¡$$EIGENVALUEEXTRACTION L,100,10.,$$SPECIFYMODAL 0,CRIT,+,0.,.03,10.,.03,$$APPLYUNITPRESSURELOADTOTHE Q,100,300, D2,400,1.,1,THRU,$$APPLYPRESSURE$INPUTFILEFORPROBLEM#6(Cont.)RLOAD2,400,300,,,310,10.,1.,1000.,1.,$$POINT$$RLOAD