A Genetic Algorithm-Based Parameter Optimal Design Method for Locally Constrained Damping Plates

Abstract

The invention relates to a genetic algorithm-based method for optimal design of parameters of a locally constrained damping plate, which describes the geometric information of a constrained damping plate, establishes a parameter optimization design model of a locally constrained damping plate, divides the structure of a constrained damping plate into grids, and establishes an entity constrained damping The stiffness matrix and mass matrix of the unit are obtained, and the stiffness matrix and mass matrix of the composite unit cut by the boundary of the constrained damping sheet are obtained, and the overall stiffness matrix and mass matrix are obtained, and the finite element dynamic model of the constrained damping plate is established, and the constrained damping plate is obtained. Modal loss factor; the design variables are iterated through the constrained optimization genetic algorithm until the objective function obtains the optimal value, and the geometric parameters of the constrained damping sheet are obtained. The invention realizes the optimal design of local constrained damping structure parameters through a simple and efficient constrained optimization problem genetic algorithm. Compared with the traditional gradient-based optimization method, it is easier to find the global optimal value and avoid falling into the local extremum.

Description

technical field [0001] The invention relates to the technical field of vibration reduction and noise reduction, in particular to a genetic algorithm-based optimization design method for parameters of a locally constrained damping plate. Background technique [0002] The constrained damping structure has efficient and reliable vibration reduction characteristics, and is widely used in vibration and noise control fields such as aerospace, vehicles, and submarines. In the initial research on constrained damped structures, a large amount of work has focused on full-coverage constrained damping, but it cannot be fully covered in most projects, and the weight and energy dissipation efficiency of damping materials should also be considered. In order to enhance engineering practicability, people think of laying constrained damping locally in the structure, that is, locally constrained damping structure. In the current research on locally constrained damping structures, most of them...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a genetic algorithm-based optimization design method for the parameters of the locally constrained damping plate, which obtains the finite element model of the locally constrained damping plate structure through the interpolation method of the explicit geometric description function value of the constrained damping plate , when the parameters of the damping plate change, there is no need to re-mesh, which reduces the computational complexity and high calculation accuracy; through a simple and efficient genetic algorithm for constrained optimization problems, the optimal design of locally constrained damping structure parameters is realized

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