关键词: 遗传算法, 罚函数, 桁架结构, 拓扑优化 

Abstract:

In the structural optimization design of aircraft and automobile,the truss structure should have enough strength,stiffness and sufficient reliability,and maintain the weight of their structure as light as possible and enhance their efficiency in optimization process.A GA operation process was divided into two phases,i.e. coarse search and fine search,the crossover probability (Pc) and the mutation probability (Pm) were adaptive setting in the process respectively,and the penalty function was introduced in the truss topology model to get rid of the restriction.Finally,the improved GA was applied to analyze  the topological optimization design of the truss structures,the iteration time of the optimization design model is far less than that of  the simple genetic algorithm.It is proved the improved genetic algorithm is practicality and feasibility.

Key words: genetic algorithm(GA), penalty function, truss structure, topological optimization