基于混合PSO算法的桁架动力响应优化  

Dynamic response optimization for a truss structure based on hybrid PSO algorithm

作　　者：魏徳敏 文星宇[1] 

机构地区：[1]华南理工大学土木工程系,广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510640

出　　处：《振动与冲击》2011年第5期174-178,共5页Journal of Vibration and Shock

摘　　要：针对以结构动力响应为约束,最小重量为目标的桁架拓扑优化问题,提出了一种将微粒群算法和优化准则法结合的混合PSO算法。利用优化准则法的迭代关系找出群体中适应度最好的微粒,将其作为特殊微粒,其他微粒的寻优采用PSO的基本进化规则,位移响应约束利用特殊微粒的灵敏度信息近似计算。算例的计算结果表明,混合PSO算法适用于受简谐荷载以及脉冲荷载作用桁架结构的拓扑优化。混合PSO的计算效率比PSO算法高,其优化效果比优化准则法好。A hybrid algorithm was proposed for dynamic topology optimization of a truss structure.In optimization analyses the dynamic displacement responses of nodes were constrainted and the minimum weight of the truss structure was taken as the objective function.A particle having the best fitness from a swarm was chosen as the special particle,and it moved by means of iteration expressions in the optimality criterion method.The other particles complied with the evolution rules of PSO algorithm,and their displacement constraints were approximately calculated by using the dynamic sensitivity of the special particle.The optimization results of an example showed that the hybrid PSO algorithm is suitable for the topology optimization of the truss structure under the harmonic load and impulsive load;the optimization efficiency of hybrid PSO algorithm is higher than PSO algorithm,and the optimization precision of hybrid PSO algorithm is better than that of the optimality criterion method.

关 键 词：混合PSO 动力响应优化 拓扑优化 位移响应约束 

分 类 号：O189[理学—数学]