Topological optimization design method of periodic perforated constrained damping sheet structure

Abstract

The invention discloses a topological optimization design method of a periodic perforated constrained damping sheet structure, and belongs to the technical field of structure optimization. The methodincludes: establishing a topological optimization model of a periodic perforated constrained damping plate structure by taking maximization of a macrostructure modal loss factor as an optimization target, taking a damping material microcosmic unit as a design variable and taking a damping material usage amount as a constraint condition; establishing a cell element finite element model of the damping material, analyzing the equivalent density and the elastic matrix of the damping material cell element by adopting a homogenization theory, and establishing a macroscopic finite element model of the periodic perforated constraint damping plate structure on the basis; analyzing the sensitivity of the optimization target, and solving the established optimization model by adopting a moving progressive optimization method to obtain the topological optimization structure of the damping material cell element. According to the design method, the damping characteristic of the constrained damping plate structure can be effectively improved under the condition that the using amount of damping materials is controlled, and the good vibration and noise reduction effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of structure optimization, and more specifically relates to a topology optimization design method of a periodic opening constrained damping thin plate structure. [0002] technical background [0003] Thin-plate components can not only bear considerable loads at a small weight cost, but also have good heat dissipation properties, and have been widely used in the fields of automobiles, aerospace, ships, and high-speed rail transit. With the requirements of energy saving and environmental protection in modern industry, lightweight has become an important part of product design, and the problem of vibration and noise of thin-walled components has become increasingly prominent. The constrained damping structure effectively suppresses structural broadband vibration and noise, and has little change to the original structure, and is easy to implement. It has been widely used in the vibration and noise reduction of t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a topology optimization design method with high calculation efficiency and a periodic opening constrained damping thin plate structure, which solves the problem of maximizing the modal loss factor of the macrostructure when the amount of damping material used is constant The problem of topology optimization of thin plate structures with periodic openings constrained damping

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