Multi-objective topology optimization method for structure under multi-physical field working condition

Abstract

The invention provides a multi-objective topology optimization method for the stiffness and frequency of a structure under a multi-physical field coupling working condition. The structure designed by utilizing the method can ensure the mechanical performance of the structure based on minimum material consumption, and improve inherent frequency characteristics. The method comprises the steps of firstly building a to-be-optimized structure model by applying three-dimensional modeling software Pro/E; performing coupled field finite element analysis on the model under the multi-physical field coupling working condition to obtain equivalent strain information of each node; performing modal analysis on the model to obtain inherent frequency information of the structure; on the premise that a vibration frequency of a system is known, importing the built model into a topology optimization module, and applying a constraint condition taking an equivalent strain as a forced displacement under an original boundary condition; establishing an overall objective function including a stiffness component and a frequency component according to a compromise programming theory, and then performing topology optimization to obtain a density cloud chart of the structure; and according to the density cloud chart, obtaining the designed final structure.

Description

technical field [0001] The invention relates to the field of engineering structure optimization design, in particular to a multi-objective topology optimization design method for structures under the condition of multi-physics field coupling working conditions. Background technique [0002] The purpose of structural optimization design is to provide designers with efficient, reliable and systematic optimal structural optimization design strategies, and to seek safe, reliable and economical structural forms. Structural optimization design greatly saves the time and cost of product design and improves product performance. Structural optimization design has been widely used in automobiles, ships, aerospace, machinery manufacturing and other fields. [0003] Compared with size optimization and shape optimization, topology optimization has more design freedom, larger design space and better optimization effect. The theoretical method of continuum topology optimization has gradu...

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Problems solved by technology

But it does not solve the problem of continuum 3D structure under similar working conditions in actual engineering problems

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