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Design optimization on shock absorbing performance of carrier-based aircraft landing gear

CUI Junhua1,2,NIE Hong1,ZHANG Ming1,LIU Gang1,LONG Shuangli1(1.Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicles,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;2.91980 Troop,Yantai 264001,Shandong,China)  
To improve the shock absorbing performance of carrier-based aircraft landing gear,iSIGHT is taken as a design and simulation platform with combining multi-body system simulation and multi-objective parameter optimization co-simulation analysis,and the parameters are optimized while the multi-body system simulation software is called for simulation and analysis.The stress analysis on shock absorbing system of nose landing gear is performed,and the falling vibration mass solving with the loop-iteration method is optimized by a virtual prototype of falling vibration of landing gear,which is established by MSC Adams/Aircraft for a carrier-based aircraft.Considering the different design requirements of the landing gear shock absorbers between carrier-based aircraft and land-based aircraft,the optimization simulation is performed by MSC Adams/Aircraft which is integrated into iSIGHT with the maximum efficiency and minimum axial force of shock absorber as optimization objectives and thesectional area of pin as design variable.Then the optimal sectional area of pin is obtained,and the effect of pin shape on shock absorbing performance of landing gear is analyzed.The optimization results indicate:when the sinking velocity of aircraft is 6 m/s,the shock absorbing efficiency and the maximumaxial force are improved by 21.94% and decreased by 24.90% respectively;when the sinking velocity ofaircraft is 4.5 m/s or 3.05 m/s,the landing gear features good shocking absorbing performance.
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