A new multidisciplinary design optimization (MDO) method based on genetic algorithm was developed. The theoretic framework was built and an optimization program was designed. Firstly, genetic algorithm and MDO method were studied, and the resistance model, volume-suface ratio model, stress model were built, and the MDO method integrating aerodynamics, structure, and strength was introduced. Secondly, the genetic algorithm was used to optimize the airship shape which concluded a composite objective function, and a co-simulation method was carried out by the Matlab and Fluent. Finally, a practical case was provided and the feasibility of the method was demonstrated.%以临近空间飞艇为对象,针对传统外形设计方法中存在的问题,提出了新的优化设计方法,搭建了流程框架,编制了优化程序.首先研究了遗传算法及多学科设计理论,进而在此基础上建立了飞艇阻力、体面比、应力模型,利用多学科设计理念对飞艇气动、结构、强度进行了一体化设计.其次将遗传算法引入到优化设计当中,并利用Matlab和Fluent开展了联合仿真研究.最后结合实际应用需求进行了算例分析,验证了该方法的可行性和效果.
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