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Optimum Design of a Composite Landing Gear Door

GAO Bo;ZHAO Bin;GAN Jian;WANG Fu-sheng;YUE Zhu-feng;School of Mechanics Civil Engineering and Architecture,Northwestern Polytechnical University;Chengdu Aircraft Design & Research Institute,AVIC;  
Honeycomb sandwich composite is gradually replacing aluminum alloy as the prior material for landing gear door because its stiffness design and weight reduction are critical in aircraft design. Parametric modeling was used to build the finite element model of the new type honeycomb sandwich composite landing gear door. Through an agent model,the optimum design of composite door was achieved by multiisland genetic algorithm and sequential quadratic programming subjected to stiffness and strength constrain under two loading cases,door open and door close. The results show that the strength and stiffness of the composite door are higher. After optimization,the mass of the composite door is reduced by 11. 5%. Compared with the aluminum alloy door,the total mass of the composite door after optimization was reduced by 39. 6%. Therefore,the total mass of the landing gear door is evidently reduced. At the same time,the method of optimization after building agent model is highly efficient and could solve problems that we could not find optimum solution in multivariate design optimization.
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