Sec14-沖擊響應(yīng)譜分析

第14章沖擊響應(yīng)譜分析響應(yīng)譜方法響應(yīng)譜描述的是單自由度系統(tǒng)的峰值響應(yīng)的近似方法，是基礎(chǔ)激勵(lì)和固有頻率的函數(shù)。uB(t)t=>u3(t)tu3max響應(yīng)譜用于供應(yīng)結(jié)構(gòu)每階模態(tài)的最大響應(yīng)。結(jié)構(gòu)的響應(yīng)通過(guò)最大模態(tài)響應(yīng)的組合得到。組合方法有很多種。因而，響應(yīng)譜分析求得的是近似值。響應(yīng)譜方法(續(xù))對(duì)于不同的阻尼值，重復(fù)響應(yīng)譜分析產(chǎn)生一簇曲線。因而供應(yīng)模態(tài)響應(yīng)的最大值是必需的。*振蕩器阻尼；臨界阻尼CurveDamping(*)10%23%35%響應(yīng)譜方法(續(xù))從ui(t)計(jì)算每個(gè)振蕩器的最大位移響應(yīng)uimax。同樣的，計(jì)算每個(gè)振蕩器和其基礎(chǔ)(振動(dòng)結(jié)構(gòu)上的一個(gè)點(diǎn))之間的最大相對(duì)位移urimax.最大相對(duì)速度和確定加速度，與最大相對(duì)位移之間有如下近似關(guān)系。設(shè)計(jì)譜通常用這些變量表示ur,ur,ua. 最大響應(yīng)和相對(duì)響應(yīng).maxmax..max4Hz脈沖的單自由度響應(yīng)Zeta=.05,4Hz單循環(huán)激勵(lì)，不同單自由度系統(tǒng)的瞬態(tài)響應(yīng)(留意:Y軸應(yīng)實(shí)際大小而變更；黑線為強(qiáng)迫加速度激勵(lì)曲線)1HzModel10HzModel2HzModel4HzModel40HzModel20HzModel.5HzModel4Hz脈沖的單自由度響應(yīng)(續(xù))Frequency(Hz)Acceleration(in/sec**2)Zeta=0%Zeta=2%Zeta=5%0.351.152.701.571.051.052.004.0020.040.0響應(yīng)譜分析分兩個(gè)步驟Step1：創(chuàng)建頻譜，即用瞬態(tài)分析創(chuàng)建頻譜Step2：應(yīng)用頻譜，即用第一步創(chuàng)建的頻譜來(lái)評(píng)估結(jié)構(gòu)響應(yīng)通過(guò)確定大結(jié)構(gòu)和與其連接的結(jié)構(gòu)的響應(yīng)來(lái)創(chuàng)建頻譜，如發(fā)動(dòng)機(jī)和泵頻譜創(chuàng)建后，應(yīng)用于一系列單自由度振蕩器系統(tǒng)，作用在小結(jié)構(gòu)和大結(jié)構(gòu)的連接位置。每個(gè)單自由度振蕩器的峰值響應(yīng)由它的瞬態(tài)響應(yīng)ui(t)計(jì)算得到。振蕩器的基礎(chǔ)運(yùn)動(dòng)uB(t)來(lái)源于大結(jié)構(gòu)(如建筑物，地球)的載荷或基礎(chǔ)激勵(lì)。例子：由地震引起的電廠的運(yùn)動(dòng)。在機(jī)械設(shè)備(如機(jī)器、管道系統(tǒng))的安裝位置計(jì)算頻譜，然后用這些頻譜來(lái)進(jìn)行響應(yīng)譜分析以幫助設(shè)備設(shè)計(jì)。從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜這里存在一個(gè)暗含的假設(shè)，即振蕩器系統(tǒng)的質(zhì)量相對(duì)于大結(jié)構(gòu)(基礎(chǔ)結(jié)構(gòu))質(zhì)量而言特殊小，所以兩者之間沒(méi)有動(dòng)力學(xué)耦合現(xiàn)象。(因而小結(jié)構(gòu)應(yīng)用頻譜來(lái)計(jì)算響應(yīng)的過(guò)程可以從總體結(jié)構(gòu)的瞬態(tài)分析中解耦出來(lái)單獨(dú)進(jìn)行計(jì)算)。運(yùn)用模型中選定自由度的瞬態(tài)響應(yīng)作為輸入時(shí)間歷程,生成頻譜曲線。任何一個(gè)瞬態(tài)求解序列都可以生成頻譜SOL109干脆瞬態(tài)分析SOL112模態(tài)瞬態(tài)分析更多信息參見(jiàn)MSCNastranAdvancedDynamicsUser’sGuide.從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜(續(xù))從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜(續(xù))確定結(jié)構(gòu)(可以包括小結(jié)構(gòu))的瞬態(tài)響應(yīng)結(jié)構(gòu)激勵(lì)可以是力，也可以是強(qiáng)迫運(yùn)動(dòng)求解序列SOL109,SOL112執(zhí)行限制段SOL109例如：工況限制段OUTPUT(XYPLOT)XYPLOTDISPSPECTRAL(計(jì)算位移譜)XYPUNCHDISPSPECTRAL(生成包含譜數(shù)據(jù)的文件)例如XYPUNCHACCELERATIONSPECTRAL1/1(T1RM) 該叮囑運(yùn)用節(jié)點(diǎn)1在X(T1)方向的運(yùn)動(dòng)，在DTI,SPSEL卡的記錄號(hào)1處，創(chuàng)建一個(gè)包含確定(RM)加速度譜數(shù)據(jù)的.pch文件。假如是T1IP則代表X方向的相對(duì)(IP)響應(yīng)譜。例子必需同時(shí)包含位移和速度輸出

DISPLACEMENT(plot,SORT2,REAL)=ALLVELOCITY(plot,SORT2,REAL)=ALLOUTPUT(XYPLOT)XYPLOTACCESPECTRAL1/57(T3RM)XYPUNCHACCESPECTRAL1/57(T3RM)從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜(續(xù))從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜(續(xù))模型數(shù)據(jù)段PARAM,RSPECTRA,0$要求計(jì)算頻譜DTI,SPSEL$確定頻率和阻尼表，以及哪些節(jié)點(diǎn)輸出FREQ$指定阻尼，比如臨界阻尼率-將由DTI,SPSEL卡片引用FREQ1$指定頻率-將由DTI,SPSEL卡片引用從大結(jié)構(gòu)的瞬態(tài)分析中創(chuàng)建頻譜(續(xù))模型數(shù)據(jù)段(續(xù))例子與XYPLOT/XYPUNCH卡片的編號(hào)對(duì)應(yīng)PARAM,RSPECTRA,0$$UseDTItospecifythedampingfractionandspectrafrequency(SDOFoscillatordampingandnaturalfrequency)table.$Also,usethisentrytospecifytheGRID'sforwhichspectrawillbecalculated.$RECNODAMPFREQG1G2G3G4DTISPSEL0DTISPSEL11257ENDREC$$Thisentry(FREQ)isusedtodefinethedampingfraction.Forthisexample,thespectraordinatevalues$willbecreatedfordampingfractionsof0%,2%and4%ofcritical.$FREQ,1,0.0,0.02,0.04$$Thisentry(FREQ1)isusedtospecifythespectrafrequencyvalues.Forthisexample,thefirstfrequencyis50.0Hz,the$frequencyincrementis25.0Hz,andthenumberoffrequenciesis400.Thiswillgenerateaspectraoutto10000Hz.FREQ1,2,50.0,25.0,400案例分析：Step1-創(chuàng)建頻譜帶附屬梁的矩形板5”x2”鋁板，固支一條邊另一邊有一附屬梁在固支邊施加Z方向的瞬態(tài)強(qiáng)迫運(yùn)動(dòng)RBE2案例分析：Step1-創(chuàng)建頻譜矩形板屬性5inx2in鋁板厚0.1in楊氏模量10.0x106psi泊松比0.3密度0.102lbf/in3=2.640x10-4lbf*sec2/in4附屬梁屬性0.05inx0.05in方形截面鋁梁長(zhǎng)0.5in楊氏模量10.0x106psi泊松比0.3密度0.102lbf/in3=2.640x10-4lbf*sec2/in4通過(guò)RBE2將梁和自由邊上的節(jié)點(diǎn)11，22連接案例分析：Step1-創(chuàng)建頻譜阻尼結(jié)構(gòu)阻尼阻尼系數(shù)g為0.06如不用結(jié)構(gòu)阻尼，則必需在250Hz施加等效粘滯阻尼SOL109,干脆瞬態(tài)響應(yīng)案例分析：Step1-創(chuàng)建頻譜在固支端Z方向上加載加速度強(qiáng)迫運(yùn)動(dòng)，頻率為250Hz即在節(jié)點(diǎn)1,12,23,34,45上..案例分析：Step1-創(chuàng)建頻譜在Patran中創(chuàng)建模型幾何，面和線劃分面和線的網(wǎng)格Equivalence重合節(jié)點(diǎn)創(chuàng)建時(shí)間歷程載荷工況創(chuàng)建時(shí)間場(chǎng)約束一條短邊創(chuàng)建材料屬性創(chuàng)建單元屬性輸出MDNastran輸入文件，如jobname.bdf編輯MDNastran輸入文件，參與下頁(yè)運(yùn)行分析查看分析結(jié)果$LinearTransientResponseAnalysis,DirectFormulation,DatabaseSOL109$DirectTextInputforExecutiveControlCENDTITLE=MSC.Nastranjobcreatedon27-Aug-08at08:51:14ECHO=NONELOADSET=1$DirectTextInputforGlobalCaseControlDataSUBCASE1SUBTITLE=TransientTSTEP=1SPC=2DLOAD=2$MustspecifybothDISPLACEMENTandVELOCITYforthenodethatwillhavethe$enforcedmotion.Thisisnecessarytoobtainthedesiredresponsespectra.DISPLACEMENT(plot,SORT2,REAL)=ALLVELOCITY(plot,SORT2,REAL)=ALLACCELERATION(plot,SORT2,REAL)=ALLSTRESS(plot,SORT2,REAL,VONMISES,BILIN)=ALLFORCE(plot,SORT2,REAL,BILIN)=ALL案例分析：Step1-創(chuàng)建頻譜編輯MDNastran輸入文件文件名為casestudy14_create_response_spectra.bdf假如在Patran中懇求，則不須要手動(dòng)增加這兩個(gè)卡片案例分析：Step1-創(chuàng)建頻譜編輯MDNastran輸入文件(續(xù))OUTPUT(XYPLOT)$$useXYPLOTSPECTRALtocomputearesponsespectra,$andoutputtoaplotfile,.plt$$useXYPUNCHSPECTRALtocreateafilecontainingthe$responsespectrainTABLED1format,.pch$RMgivesabsolutespectra,IPgivesrelativespectra$XYPLOTACCESPECTRAL1/57(T3RM)XYPUNCHACCESPECTRAL1/57(T3RM)$$BEGINBULKPARAMPOST0PARAMCOUPMASS1PARAMG.06PARAMW31570.8PARAMPRTMAXIMYESTSTEP130001.-5可以在Patran中用SubcaseDirectTextInput來(lái)寫(xiě)這三張卡片，代替手動(dòng)修改bdf文件案例分析：Step1-創(chuàng)建頻譜編輯MDNastran輸入文件(續(xù))$=============================================$BeginningofResponseSpectraGenerationInput$PARAM,RSPECTRA,0$$UseDTItospecifythedampingfractionandspectrafrequency(SDOFoscillatordampingandnaturalfrequency)table.$Also,usethisentrytospecifytheGRID'sforwhichspectrawillbecalculated.$RECNODAMPFREQG1G2G3G4DTISPSEL0DTISPSEL11257ENDREC$$Thisentry(FREQ)isusedtodefinethedampingfraction.Forthisexample,thespectraordinatevalues$willbecreatedfordampingfractionsof0%,2%and4%ofcritical.$FREQ,1,0.0,0.02,0.04$$Thisentry(FREQ1)isusedtospecifythespectrafrequencyvalues.Forthisexample,thefirstfrequencyis50.0Hz,the$frequencyincrementis25.0Hz,andthenumberoffrequenciesis400.Thiswillgenerateaspectraoutto10000Hz.FREQ1,2,50.0,25.0,400$$EndofResponseSpectraGenerationInput$=============================================可以在Patran中用BulkDataDirectTextInput來(lái)寫(xiě)這些內(nèi)容，代替手動(dòng)修改bdf文件案例分析：Step1-創(chuàng)建頻譜編輯MDNastran輸入文件(續(xù))$

$ElementsandElementPropertiesforregion:platePSHELL11.111$Pset:"plate"willbeimportedas:"pshell.1"CQUAD411121312CQUAD421231413CQUAD431341514..Restofelements.$$ElementsandElementPropertiesforregion:appendagePBARL21BAR.05.05$Pset:"appendage"willbeimportedas:"pbarl.2"$CBAREIDPIDGAGBX1X2X3$Pset:"appendage"willbeimportedas:"pbarl.2"CBAR42257580.0.1.CBAR44258590.0.1.$Nodesoftheappendagemodel$GRIDIDX1X2X3GRID575.50.0.GRID585.50.50.GRID596.00.50.$$MaterialRecord:alum$DescriptionofMaterial:Date:27-Aug-08MAT111.+7.32.64-4$MultipointConstraintsoftheEntireModel$IDconflict:thePATRANMPCIDwas1RBE242571234561122$NodesoftheEntireModelGRID10.0.0.GRID2.50.0...RestofnodesandLBC.ENDDATAbdf模型文件包含的有限元模型案例分析：Step1-創(chuàng)建頻譜在Patran中顯示瞬態(tài)分析結(jié)果案例分析：Step1-創(chuàng)建頻譜.pch文件中得到三條頻譜曲線$SUBCASE11$ACCE157512$0.000000E+00TABLED1250.140.01375.449.551100.1424.27125.4666.89…

10050.613.28ENDT$SUBCASE1404$ACCE15751405$2.000000E-02TABLED1350.138.9175.435.291100.1298.9125.3797.37…10050.612.53ENDT$SUBCASE1807$ACCE15751808$4.000000E-02TABLED1450.138.97375.423.236100.1192.78125.3139.79….10050.612.487ENDT

案例分析：Step1-創(chuàng)建頻譜ThetransientresponseatGrid57isconvertedintoaspectraat0%,2%and4%criticaldamping.頻譜的應(yīng)用輸入的基礎(chǔ)激勵(lì)頻譜用于確定每階模態(tài)的峰值響應(yīng)。組合這些峰值模態(tài)響應(yīng)得到系統(tǒng)響應(yīng)。唯一的問(wèn)題是這些模態(tài)的峰值響應(yīng)通常不是同時(shí)達(dá)到的。計(jì)算的只是峰值響應(yīng)的幅值。組合峰值響應(yīng)的方法有三種，分別是ABS,SRSS和NRL。建立待分析的結(jié)構(gòu)模型，將輸入點(diǎn)自由度標(biāo)記為SUPORT自由度。在SUPORT自由度上附加一個(gè)大質(zhì)量(通常為總體結(jié)構(gòu)質(zhì)量的103到106倍)。運(yùn)用無(wú)約束的SUPORT自由度模型得到系統(tǒng)模態(tài)(包括0Hz模態(tài))。這與附屬于“激勵(lì)源”結(jié)構(gòu)的“懸臂梁”模態(tài)近似。頻譜的應(yīng)用(續(xù))0.0Hz模態(tài)近似于當(dāng)支撐結(jié)構(gòu)“靜態(tài)”運(yùn)動(dòng)時(shí)，模型閱歷的“靜態(tài)”運(yùn)動(dòng)?！皡⑴c因子”(Participationfactors，PF)運(yùn)用如下表達(dá)式計(jì)算：這里[f]是約束的基礎(chǔ)“彈性”模態(tài)矩陣[M]質(zhì)量陣[Dm]包含剛體模態(tài)(即頻率是0.0Hz的模態(tài))PF與輸入段中描述的計(jì)算每階模態(tài)的峰值響應(yīng)的頻譜一起運(yùn)用。頻譜的應(yīng)用(續(xù))然后在峰值運(yùn)動(dòng)的基礎(chǔ)上計(jì)算每階模態(tài)的數(shù)據(jù)復(fù)原(位移、應(yīng)力、力等)。然后選用合適的方法(ABS,SRSS,NRL)組合這些復(fù)原數(shù)據(jù)。單自由度振蕩器基于基礎(chǔ)運(yùn)動(dòng)uB(t)的相對(duì)位移響應(yīng)uri(t)由下面公式計(jì)算：系統(tǒng)(net)在物理空間的瞬態(tài)響應(yīng)有下面公式精確地計(jì)算頻譜的應(yīng)用(續(xù))ABS選項(xiàng)這里k表示物理自由度i表示模態(tài)階數(shù)頻譜的應(yīng)用(續(xù))SRSS選項(xiàng)這里平均峰值模態(tài)幅值：NRL選項(xiàng)這里

頻譜的應(yīng)用(續(xù))案例分析：Step2-應(yīng)用頻譜用前面的模型執(zhí)行一個(gè)響應(yīng)譜分析。運(yùn)用前面的案例分析求得的頻譜。附屬梁結(jié)構(gòu)用戶單獨(dú)分析，加載在其基礎(chǔ)激勵(lì)位置(Grid57).案例分析：Step2-應(yīng)用頻譜編輯MDNastran輸入文件文件名casestudy14_apply_spectra.bdf指定其求解序列為SOL103指定感愛(ài)好的輸出SOL103CENDTITLE=MSC.Nastranjobcreatedon27-Aug-08at08:51:14ECHO=NONE$DirectTextInputforGlobalCaseControlDataSUBCASE1SUBTITLE=RunSOL103toapplythespectra.METHOD=1SPC=2VECTOR(SORT1,REAL)=ALLSPCFORCES(SORT1,REAL)=ALLSTRESS(SORT1,REAL,VONMISES,BILIN)=ALLFORCE(SORT1,REAL,BILIN)=ALLACCEL=ALL$====================================$BeginCaseControlPortionforapplyingspectraSDAMP=200$turnonthemodaldampingvaluesDLOAD=500$turnonthespectratouse$EndCaseControlPortionforapplyingspectra$====================================可以用Patran子工況中的干脆文本輸入代替手動(dòng)修改案例分析：Step2-應(yīng)用頻譜編輯MDNastran輸入文件(續(xù))必需指定輸出格式為.op2文件，因?yàn)橹挥?op2文件支持后處理附屬梁的模型數(shù)據(jù)集存于單獨(dú)的文件‘a(chǎn)ppendage.bdf’中，可以用INCLUDE叮囑來(lái)包含PARAMCOUPMASS1$$Specifytoobtainresultsinthe.op2file,asresponsespectraresultsareonlysupportedinthe.op2PARAMPOST-1$$theeigensolutionfrequencyrangeneedstoincludetherigidbodymodeandgotothedesiredupperfrequencyEIGRL110000.0MASS$$includetheappendagemodel…oritcouldjustbelistedhereINCLUDE‘a(chǎn)ppendage.bdf’$$SPCADD21$DisplacementConstraintsofLoadSet:base_spectraSPC111245657案例分析：Step2-應(yīng)用頻譜編輯MDNastran輸入文件(續(xù))$=======================================$BeginsectionfordefiningSpectraapplication$$UsethefollowingPARAMtocausearesponsespectrumanalysistobeperformedPARAM,SCRSPEC,0$$SpecifymodalresponsesummingmethodPARAM,OPTION,ABS$$Specifyfrequencyrangeforcalculationofresponse...includingtherigidbodymodewillresultinabsolute$response,whileremovingitwillresultinrelativeresponseNOTE:thespectracurveMUSTencompasstheentiremodalrangePARAM,LFREQ,0.1PARAM,HFREQ,10000.0$$DefineSUPORTentryforNode57…ThisistoidentifyexcitationDOFSUPORT,57,3$$NeedtospecifyalargemassfortheexcitationDOF,themassshouldbe1.e3to1.e6largerthanthemassofthestructureCONM242571000.加載的頻譜曲線的頻率范圍必需不小于感愛(ài)好的頻率范圍，否則Nastran會(huì)自動(dòng)運(yùn)用外插值方法來(lái)補(bǔ)齊所缺頻率案例分析：Step2-應(yīng)用頻譜編輯MDNastran輸入文件(續(xù))$Specifythemodaldampingforeachnormalmode,this$willindicatewhichreponsespectratabletouse...eachtablecorrespondstoauniquevalueofdamping.TABDMP1,200,CRIT,,0.0,0.030,10000.0,0.03,ENDT$$Specifyresponsespectrasettobeusedfortheanalysis:DLOAD,SID,S(overallscalefactor),S1(scalefactorforR-SetDOF1),$L1(responsespectratableforDOF1),S2(scalefactorforR-SetDOF2),L2(responsespectratableforDOF2),etc.$L1pointstotheDTI,SPECSEL,RECNOof1DLOAD,500,1.0,1.0,1$$Specificationofresponsespectratables...$thereneedtobetablesforatleast2differentdampingvaluesifthemodaldampingspecifiedaboveneeds$interpolationand/orextrapolation.Belowhastablesspecifiedfordampingof0%,2%and4%critical,sothemodal$dampingof3%abovenecessitatesinterpolationbetweenthe2%and4%spectratables.$DTI,SPECSEL,0DTI,SPECSEL,1,,A,2,0.0,3,0.02,,4,0.04,ENDREC$RESP=A(acceleration),V(velocity),D(displacement)$$includetheTABLED1dataoutputfromthespectragenerationrunINCLUDE'casestudy14_create_response_spectra-coupmass.pch'$$EndsectionfordefiningSpectraapplicationTABDMP1卡片指定模態(tài)阻尼。模態(tài)阻尼的每個(gè)阻尼值都須要指定響應(yīng)的頻率；或者至少指定兩對(duì)頻率和阻尼值，Nastran對(duì)做相應(yīng)的插值處理。案例分析：Step2-應(yīng)用頻譜編輯MDNastran輸入文件(續(xù))包含的頻譜數(shù)據(jù)，即.pch文件的內(nèi)容$SUBCASE11$ACCE157512$0.000000E+00TABLED1250.140.01375.449.551100.1424.27125.4666.89…

10050.613.28ENDT$SUBCASE1404$ACCE15751405$2.000000E-02TABLED1350.138.9175.435.291100.1298.9125.3797.37…10050.612.53ENDT$SUBCASE1807$ACCE15751808$4.000000E-02TABLED1450.138.97375.423.236100.1192.78125.3139.79….10050.612.487ENDT右圖中表格內(nèi)容有所省略附屬梁的MDNastran模型數(shù)據(jù)文件名為appendage.bdf案例分析：Step2-應(yīng)用頻譜$$ElementsandElementPropertiesforregion:appendagePBARL21BAR.05.05$Pset:"appendage"willbeimportedas:"pbarl.2"$CBAREIDPIDGAGBX1X2X3CBAR42257580.0.1.CBAR44258590.0.1.$Nodesoftheappendagemodel$GRIDIDX1X2X3GRID575.50.0.GRID585.50.50.GRID596.00.50.$MaterialRecord:alum$DescriptionofMaterial:Date:27-Aug-08Time:08:44:58MAT111.+7.32.64-4$案例分析：Step2-應(yīng)用頻譜.f06文件中的響應(yīng)譜分析結(jié)果文件名為casestudy14_apply_spectra.f06 REALEIGENVALUESMODEEXTRACTION EIGENVALUE RADIANS CYCLES GENERALIZED GENERALIZEDNO.ORDER MASS STIFFNESS1 1 -1.665335E-16 1.290478E-08 2.053860E-09 1.000000E+00 -1.665335E-162 2 1.409380E+08 1.187173E+04 1.889445E+03 1.000000E+00 1.409380E+083 3 1.728821E+08 1.314847E+04 2.092643E+03 1.000000E+00 1.728821E+084 4 1.112102E+09 3.334820E+04 5.307530E+03 1.000000E+00 1.112102E+095 5 1.259435E+09 3.548852E+04 5.648173E+03 1.000000E+00 1.259435E+09 REALEIGENVALUES (ACTUALMODESUSEDINTHEDYNAMICANALYSIS)MODEEXTRACTION EIGENVALUE RADIANS CYCLES GENERALIZED GENERALIZEDNO.ORDER MASS STIFFNESS2 2 1.409380E+08 1.187173E+04 1.889445E+03 1.000000E+00 1.409380E+083 3 1.728821E+08 1.314847E+04 2.092643E+03 1.000000E+00 1.728821E+084 4 1.112102E+09 3.334820E+04 5.307530E+03 1.000000E+00 1.112102E+095 5 1.259435E+09 3.548852E+04 5.648173E+03 1.000000E+00 1.259435E+09案例分析：Step2-應(yīng)用頻譜.f06文件中的響應(yīng)譜分析結(jié)果(續(xù))MATRIXFN(GINONAME101)ISADBPREC1COLUMNX4ROWRECTANGMATRIX.COLUMN1ROWS1THRU4--------------------------------------------------ROW1)1.8894D+032.0926D+035.3075D+035.6482D+03

PSITPOINTVALUEPOINTVALUEPOINTVALUEPOINTVALUEPOINTVALUECOLUMN157T3-6.14442E-04COLUMN257T37.98213E-12COLUMN357T3-3.69225E-04COLUMN457T31.77909E-10矩陣FN列出了用于分析的固有頻率矩陣PSIT列出了模態(tài)參與因子(PF)…每階模態(tài)一欄(column)，欄內(nèi)一行代表一個(gè)激勵(lì)輸入(通常是1個(gè)輸入).案例分析：Step2-應(yīng)用頻譜.f06文件中的響應(yīng)譜分析結(jié)果(續(xù))USETDEFINITIONTABLE(INTERNALSEQUENCE,ROWSORT)RDISPLACEMENTSET-1--2--3--4--5--6--7--8--9--10-1=57-3SCALEDSPECTRALRESPONSE,ABSOPTION,DLOAD=500CLOSE=1.00MATRIXUHVR(GINONAME101)ISAREAL3COLUMNX4ROWRECTANGMATRIX.0COLUMN1ROWS1THRU4--------------------------------------------------ROW1)-2.8288E-09-3.0344E-17-2.0877E-10-8.8769E-170COLUMN2ROWS1THRU4--------------------------------------------------ROW1)-3.3583E-05-3.9898E-13-6.9620E-06-3.150