基于MSC-NASTRAN的離散變量結(jié)構(gòu)優(yōu)化分析及非線性隨機(jī)響應(yīng)探討.pdf

1、浙江大學(xué)碩士學(xué)位論文基于MSCNASTRAN的離散變量結(jié)構(gòu)優(yōu)化分析及非線性隨機(jī)響應(yīng)探討姓名：張全林申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：黃志龍?zhí)諅ッ?001.2.111、，‘一浙江大學(xué)碩士學(xué)位論文2001AbstractInt11efirstpartofthethesisthemethodbasedonMSC／NASTRANforstructuraloptimizationwithdiscontinuousvariableisdis

2、cussedBecausconlyoptimizationofcontinuousvariablecallbeperformedinNASTRANandthelowefficiencyofmostdistributedvariableoptimizationsoftwareSottwarebasedontheoptimizationmodulesofNASTRANWasdevelopedtoSOlyethisquestionUserca

3、lleditthetemplateofmodelfiletomaketheprogl：鋤fitforspecialstructuresandmaketheprocessofdataimputingleastneprogramCallgeneratethemodelfileofNASTRAN，callNASTRANtocompute，chose也ecrosssectionofstructuralsteel，comparetheresult

4、andfitdataautomaticallyThelldecidethebestresultwhichCanmakecrosssectionsmallestandmakethewholestructurelightestInthesecondpartofthethesisthemethodfortheanalysisofresponsespectrumonnonlinearstructureisdiscussedAsweknowfro

5、mthetheoryofrandomvibration，thereisasimplelinearrelationbetweentheresponsespectrumandthemotivationspectrumAsfornonlinearsystem，therelationismuchdifficultandisstillthehotspotinthisfieldInthispart，wefirstchangetheinputtedl

6、oadspectrumtoasamplesequenceoftimehistoryandthencomputethedynamicresponseofthestmctLlrewimthemoduleofnonlineardynamicresponseinNASTRANAtlastwechangetheresulttotheresponsespectrumofthestructureThemothodisn’tboundedtothefr