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1、西北工業(yè)大學(xué)碩士學(xué)位論文飛機炮艙結(jié)構(gòu)有限元建模及固有特性分析姓名：姜紅昭申請學(xué)位級別：碩士專業(yè)：載運工具運用工程指導(dǎo)教師：賀爾銘20060301鞲托工業(yè)大學(xué)碩士論文摘要ABSTRACTDuringtheaircraft’swholerunninglife，besidestheoutsideloadswhichactontheaircraft，vibrationwillalsocausequiteseriouslystressinsideaircraft’Sstructure，especiallyinthelinkplaces，wherethestructure’Sstiffn

2、essalwaysisverylarge．Thestresscausedbyvibrationwillmakethestructure’Scracksarisemuchearlierthanpeople’Sexpectation．T撻swillmakethestructurelostit’Sfunctionandsometimemaycauseamoreseriouslyaccident．Becauseofthis，thestructure’Svibrationmustbestudied，whereastructurevibrationalwaystakesplace．Wit

3、htheanalysisresults．engineerscanimprovethestructuredesigningtoreducethestructure’svibration．Anaircraft’Sgunchamberisthemainlyloadbearingpartwhichlinktheaircraft’Sgunandthebodystructure，Whentheaircraftisinuse，thegunchamberwillbeartheforcenotonlycomefromtheairpressureandtheengine’Sthrustforce

4、，butalsotheimpactforceComefromthefiringofthegun．Becausetheaircraft’sstructureisanelasticassembly，everypartwillhavethemnaturevibrationmode．Withastimulateforoeandalittledamper，afreevibrationwilltakeplaceinthesestructure．Whentheaircraftisflyingintheair，thevibrationwouldliketoactwiththeairforce

5、together，andwillgetenergyformtheairflow．Inthiscasethevibrationmaybecomemoreviolent．Besideoftheseabore，someoutsidenoisewiltmakethestructurevibratetoo，especiallyataspecificstimulatingfrequency，thesympatheticvibrationwilltakeplace．Thiswillcausethelastlyinvalidationoftheaircraft’Sstructures．Int

6、histhesis，thedynamicresponseoftheaircraft’SgunchamberstructureundervibrationiSstudiedwiththehelpofthefamousFEMsoftwareANSYS。Tohavethisbedone，although，therehaveconnectprocedurebetweentheANSYSsoftwareandtheCATIAsoftware，themodelthatimportdirectlywillhaveamoreelementtolose，andCan’tbeapplyinANS

7、YSstructureanalysisdirectly，BytheANSYSsoftware，everypartsofmodelwererepairedfirst、tobuildupthemodelthatcouldmeshintheANSYS．Secondly，ImportinotherpartstogethertomakeupofthewholestructureCADmodel．Inmesh，thecoordinationofeverymeshtypeandthesizeofthemodelpar