考虑多工况的起落架结构拓扑优化设计

Topology Optimization Design of Landing Gear Structure Considering Multiple Working Conditions

飞机起落架结构在着陆、地面操纵多工况下承担复杂载荷,因此在保证起落架结构的承载能力的同时满足轻量化设计,是起落架设计的重点。该文以起落架外筒为例,考虑起落架在使用过程中的若干严苛工况载荷,基于有限元方法,以应力和体积为主要约束,以加权应变能最小化为优化目标,采用各向同性材料惩罚模型进行拓扑优化求解,得到高度适配于使用工况的"强、坚、轻"的结构,基于多工况载荷的优化后起落架外筒质量降低了19.87%。

The landing gear structure of the aircraft bears complex loads under multiple conditions of landing and ground control. Therefore, it is the key point of landing gear design to ensure the carrying capacity of landing gear structure and meet the lightweight design. Taking the outer cylinder of the landing gear as an example, considering several severe working conditions of the landing gear in use, based on the finite element method, taking the stress and volume as the main constraints and the minimization of weighted strain energy as the optimization objective,the topology optimization solution is carried out by using the isotropic material penalty model, and the "strong, hard and light" structure highly suitable for the working conditions is obtained, after the optimization based on multi condition load, the mass of landing gear outer barrel is reduced by 19.87%.