Improved continuum structure topological optimization post-processing method

Abstract

The invention discloses an improved continuum structure topological optimization post-processing method. The improved continuum structure topological optimization post-processing method is characterized by adopting a large grid size, namely, the size of a finite element analysis unit being larger than a default value 1, and when topological optimization is conducted on a target model, effectivelyavoiding a fine columnar structure caused by too many grids; and performing binarization processing on the optimization model, analyzing the optimization model, extracting a zigzag boundary line, obtaining a target discrete angular point set through numerical calculation, performing curve fitting by taking the target discrete angular point set as a sample point, performing further interpolation processing on the obtained new boundary line to generate a topological structure with a smooth boundary, and performing entity processing on the topological structure. According to the method provided by the invention, the sawtooth boundary of the optimized structure is effectively eliminated, the original design requirement of the optimized structure is ensured, the calculation difficulty is reduced, the calculation duration is shortened, the model manufacturability is enhanced, and the difficulty of a topological optimization post-processing procedure is effectively reduced.

Description

technical field [0001] The invention relates to the technical field related to structure optimization, in particular to an improved post-processing method for topology optimization of continuum structures. Background technique [0002] The topology optimization method is one of the most promising structural optimization methods. This method can effectively use materials and make up for the limitation that size and shape optimization cannot change the topology of the structure. It has received special attention and developed rapidly in recent years because of its flexibility to create and eliminate small cavities during optimization. [0003] The topology optimization of continuum structure is an important problem in optimal design. Currently, the most commonly used topology optimization methods for continuum structure include homogenization method, variable density method, progressive structure optimization method (ESO), level set method (Levelset), independent continuous M...

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Problems solved by technology

But in fact, due to problems such as network dependence and numerical instability, more unit numbers will generate infinitely many design variables, which will reduce the size and increase the number of columnar structures in the optimization results, and increase the geometric complexity. Increase the optimization time

At the same time, the jagged structure boundary makes the results of topology optimization extremely difficult to process, and it is not easy to import into other CAD software for post-optimization processing

In order to obtain a smooth boundary, further shape optimization is required. If the mapping relationship is used to convert the grid model into a smooth curve or surface model, the processing of the mapping relationship is usually difficult, resulting in time-consuming and laborious results, which is not ideal

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