平面桁架结构拓扑优化设计的改进智能算法

结构拓扑及形状退火算法(STSA)用于桁架结构拓扑优化设计,其优化特点为注重结构构型的改变而较少考虑结构的力学性能,而针对既定几何构型的桁架结构截面优化,满应力准则法(FSD)具有明显优势,因此,将其引入退火历程改进STSA。提出结构几何构型状态相对稳定判别方法,并以结构构型状态相对稳定作为引入FSD的最佳时机形成杂交算法。算例分析表明:该改进智能算法使寻优搜索过程更为稳定,其表现为搜索效率、鲁棒性和最优解均得以改善。

IMPROVED INTELLIGENT ALGORITHM FOR TOPOLOGY OPTIMIZATION DESIGN OF PLANAR TRUSS STRUCTURE

Little dose the structural topology simulated annealing algorithm(STSA) consider structural mechanical property and more dose it pay attention to the geometric configuration while optimizing the topology of a truss structure.Moreover,fully stressed design(FSD) specializes in the section optimization of truss structures with fixed configuration.Therefore,FSD was introduced into heuristic searching process of STSA to improve the intelligent algorithm.In addition,an approach was proposed to identify the relative configuration stability of a truss structure,and incorporated FSD with STSA to establish a hybrid algorithm.A benchmark optimizing problem was performed based on such modified intelligent algorithm,and the results exhibit that the searching process of hybrid algorithm is more stable than that of STSA in terms of efficiency,robustness and optimal solutions.