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1、Sep.2005TransactionsofNanjingUniversityofAeronautics&AstronauticsVol.22No.3IMPROVEDLANDING-GEARDESIGNFORFLEXIBLEAIRPLANESHIYou-jin(DepartmentofBasicScience,YanchengInstituteofTechnology,Yancheng,224003,P.R.China)Abstract:Landingdynamicsimulationandlanding-gearoptimizationdesignareusedtoim
2、provethelanding-geardesignforaflexibleairplane.Landingresponseissimulatedbyusingvelocity-squareddamping,polytropicexpo-nentialair-compressionspring,tireforcepowerfunctioncharacteristics,andanequivalentthree-masssystem.Optimizationoflanding-gearparametersisperformedconsideringthemaximumdis
3、placementofthelanding-gearshockstroke,themaximumlanding-gearforceandthemaximumdeformationofthewingtipinthelandingim-pact.Resutlsshowthatlanding-geardesignparametershaveanimportantinfluenceonthestructuralflexibilityoftheairplane.Andthelandingperformanceofthelanding-gearcanbeimprovedbytheop
4、timizedmeteringpintypelanding-gear.Keywords:flexibleairplane;landingresponse;dynamicsimulation;landing-gear;optimizationdesign;passivecontrolCLCnumber:V226Documentcode:AArticleID:1005-1120(2005)03-0224-06[8,9]INTRODUCTIONgoodresults.Thispaperdiscussestheuseofvelocity-squareddamping,polytr
5、opicexponentair-com-Intheconventionaldesignoflanding-gearsitpressionspring,tireforcepowerfunctioncharac-isusuallyassumedthatanairplaneisarigidteristics,andanequivalentthree-masssystemtobody,andatwo-masssystemequivalenttouppersimulatethelandingdynamicsofaflexibleair-andlowermassesoflanding
6、-gearshock-strutplane,andtheoptimizationdesignoftheflexibleelastomericbearing,isusedinjigdroptestsand[1,2]airplanelanding-geartostudytheeffectoffuse-thelandingimpactanalysis.Inthestudyoflagevibrationsonoptimizationdesignparametersairplanetaxiingandlandingresponses,itmustofthelanding-gear.
7、Theflexibleairplanelanding-considerthefirstfewmodesofthefuselagevibra-geardesignisimprovedbyemployingthepassive[3,4]tion.Ifonlyconsideringtherigidmodeandcontrolmethods.thefirstmodeofthefuselagevibration,aflexibleairplanecanbesimplifiedasanequivalentthree-1AIRPLANEMO
