Local constraint damping plate parameter optimization design method based on genetic algorithm

Abstract

The invention relates to a local constraint damping plate parameter optimization design method based on a genetic algorithm. The method comprises: describing geometric information of the constrained damping fin; establishing a local constraint damping plate parameter optimization design model; performing grid division on the constrained damping plate structure; establishing a rigidity matrix and amass matrix of the entity constraint damping unit, obtaining a rigidity matrix and a mass matrix of a composite unit cut by the boundary of the constraint damping fin, obtaining an integral rigiditymatrix and an integral mass matrix, establishing a finite element dynamic model of the constraint damping plate, and obtaining a modal loss factor of the constraint damping plate; and iterating the design variable through a constraint optimization genetic algorithm until the objective function obtains an optimal value to obtain the geometric parameter of the constraint damping fin. Parameter optimization design of the local constraint damping structure is achieved through a simple and efficient constraint optimization problem genetic algorithm, and compared with a traditional gradient-based optimization method, the local constraint damping structure parameter optimization design method has the advantages that a global optimal value can be found more easily, and falling into a local extremevalue is avoided.

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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