Multi-Objective Topology Optimization of a Spacial Structure Considering Complex Working Conditions
The study aims to improve the stiffness and dynamic performance of the connecting frame and achieve its lightweight.Based on the topological optimization theory of the variable density method,the mathematical model of topological optimization of the connecting frame under multiple working conditions was established by the compromise programming method.Considering the influence of thermal,dynamic and static loads of the connecting frame,the weights of each working condition were decomposed by the analytic hierarchy process and the topological optimization design of the connecting frame was carried out.Based on the optimization results,the geometric reconstruction of the connecting frame was carried out,and the stress,displacement,natural frequency and mass of the connecting frame before and after its optimization were analyzed.The results are as follows.The weight of the optimized connecting frame is reduced by 21.7%,from 0.129 kg to 0.101kg;Its maximum deformation is reduced by 6.2%,from 0.369 mm to 0.346 mm;Its maximum equivalent stress is reduced by 8.1%from 583 MPa to 536 MPa;Its first-order frequency of the connecting frame was increased by 11.9%,from 1 700 Hz to 1 902 Hz.This conclusion provides a theoretical reference for the design of lightweight supporting components for spacecraft and other systems.
spacewaremulti-objective topology optimizationvariable density methodeclectic planning method
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