关键词: 局部特征, 子结构法, 超单元, 连续结构优化, 柴油机活塞

Abstract: To realize the feasibility and efficiency of continuum structural optimization,an optimization method based on local characteristics of substructure was proposed.Starting from the sub-functions of optimization process and the analysis on geometric features of continuum structure,the continuous structure was divided into parametric substructure,super-element substructure and state variable substructure.By choosing the geometric features of parametric substructure as the design variables,the optimized posture evaluation model was established to minimize continuous structure mass with requirements of stress and strain,which were made of the maximum stress and strain of the continuous structure supported by the parametric substructure and the state variable substructure.The local structure which implied the unchangeable local geometry of whole structure and the exclusive desired state variables named the super-element substructure.The model was solved by the sequential quadratic programming based on gradient.As the illustrative examples,the analysis and optimization were preformed through the continuous structural optimization of diesel engine piston,the reasonableness and superiority of proposed method were illustrated by comparing with the traditional methods at the convergence and efficiency.

Key words: local characteristics, substructure method, super-element, continuous structural optimization, diesel engine piston