Topology Optimization Analysis Of Compressor Bracket Based On Bidirectional Progressive Structure Optimization Method

With the introduction of the concept of lightweight,topological structure technology have been increasingly received attention to researchers,and this technology can achieve a reasonable design for the structure without its basic form,and increase the material utilization.Therefore,the continuum topology optimization has got a huge development and becomes one of the important structural means for lightweight design.However,the fact is that the theory studies of the topological optimization and the relevant applications are at the beginning stage,and there are still many technical problems in this area.The study aims to solve problems which exist in the topology optimization of three-dimensional continuum structures.This thesis deeply discusses the development and theoretical basis of the structural topology optimization technique,and details the homogenization method,variable density method,evolutionary structural optimization method(ESO)and its modifications,genetic algorithms(GA)and other commonly used methods of the continuum structural topology optimization,and also analyzes the limitations of these methods in practical issues.Combined with ESO,BESO and GA,a new algorithm is proposed for solving the topology optimization problems of three-dimensional continuum structures: bi-directional evolutionary genetic algorithm(BGESO),and the thesis programs the algorithm by using APDL parameters language in ANSYS15.0,increasing its applicability with modularity.Then it takes an optimization for the structure of Michell by using this algorithm and makes a comparison with the result of the ESO,which can verify that the BGESO algorithm has good global optimization and higher efficiency.Under the requirement of design lightweight for the production of compressor bracket in the enterprise,the thesis solves this optimization problem though BGESO algorithm and gets a new structure of the bracket after a treatment of the result.From the result of the finite element analysis,with meeting the practical requirements,the new bracket reduces the weight of 11.4%,and improves the utilization of the scaffold.