Structural topology optimization design method based on stress punishment and self-adaptive volume

Abstract

The invention belongs to the related technical field of structural optimization design and discloses a structural topology optimization design method based on stress punishment and self-adaptive volume. The structural topology optimization design method is suitable for structural optimization considering stress constraints, rigidity maximization and volume fraction minimization and comprises the following steps that an optimization model based on stress punishment and a parameterized level set method is utilized to solve flexibility minimized structural optimization based on stress under volume constraints, and an interval searching method is utilized to adjust the volume constraints so as to narrow the searching range of structural optimized volume fractions and obtain the volume fraction upper limit value of an optimum structure; a local searching method is utilized to further adjust the volume constraints so as to obtain the volume fraction of the optimum structure and output the optimum structure. According to the structural topology optimization design method, solution is performed in a cycle applying mode, and the shortcoming that the structural volume minimization serves as an optimization target or the shortcoming brought by man-made selection of the volume constraints is directly avoided. The optimized structure has the advantages of high rigidity and light weight, and the strength of the optimized structure meets the design requirements.

Description

technical field [0001] The invention belongs to the technical field related to structural optimization design, and more specifically relates to a structural topology optimization design method based on stress penalty and adaptive volume. Background technique [0002] In practical engineering applications, the strength and performance requirements of structures need to be met, so stress constraints are often taken as an important consideration in structural design. However, the existing structural topology optimization methods based on stress constraints still have some disadvantages: (1) The local stress method is adopted, that is, the stress on each unit in the design domain is considered, and each design unit needs to add a stress constraint, although it can be compared Precisely control the stress of the structure everywhere, but lead to a large number of constraints, resulting in expensive calculation costs and low calculation efficiency; (2) If the global stress method ...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a structural topology optimization design method based on stress penalty and adaptive volume, which is used to solve the problem of simultaneously increasing structural stiffness and reducing material consumption, and satisfying stress constraints structural optimization problem

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