Strength Analysis And Structural Ptimization Of The Main Landing Gear’s Wheel-Hub

Landing gear, the Aircraft’s main load-bearing components, withstand the corresponding loadwhen the aircraft is parking, landing, or taking off the ground. The development of the large aircraftpromoted higher demand to the landing gear system, include not only having sufficient strength andrigidity, but also carrying the lightest weight. Therefore, study the intensity of landing gear systemsand then work to optimize the design, as an indispensable part of the landing gear’s design steps, caneffectively guide the design and development of new products.This paper proceeded from the basic idea of optimization design of finite element, focused on theapplication of ANSYS in the main landinggear-wheelhub’s stiffness and strength analysis, the brakethermal stress analysis and specific process of structural optimization.The very paper used the APDL parametric design language, provided by ANSYS softwarecorporation, created the landinggear-wheelhub’s parameterized finite element model. By means ofsetting contacts between assembly parts of the bearing and hub to simulate the interaction of them,have a in-depth discussion of the options and the importance of contact analysis; Studied how to applyloads suffered from the ground on the wheelhub model equally; Obtained the stress distribution ofwheelhub in four working conditions, check its strength, then made structural deformation analysis ofthe Play stomatal which is vulnerable to crack and check its stiffness; calculated the temperature fieldunder the braking conditions, and then coupled it with the stress of the structure, obtain the thermalstress, and analyzed the effect on the wheelhub’s stress distribution imposed by the high temperature;In structural optimization, select the inside area of wheelhub’s rotating surface for the area to bemodified, select the fourth strength theory’s equivalent stress and maximum displacement value of thestructure as design variables, chose the volume of wheel as the objective function to be optimized;Optimization results showed that: after reducing the wheel size by14%, the strength and stiffness canstill meet the requirements, this study have achieved the expected aim for losing weight and reducingcosts.