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Constrained damping plate optimization design method based on bidirectional evolutionary optimization algorithm

A technology of constrained damping and optimization algorithm, applied in computing, instrumentation, electrical and digital data processing, etc., can solve the problems of recovery, affecting the reliability of optimization algorithm, inefficient local optimization of optimization results, etc., and achieve the effect of reasonable material layout

Inactive Publication Date: 2014-12-10
CHONGQING UNIV
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Problems solved by technology

[0003] In the process of using the incremental optimization algorithm to optimize the topology of the structure, some deleted low-efficiency units may become high-efficiency units, but the incremental optimization algorithm cannot restore these deleted units to solid units, which affects the performance of the optimization algorithm. Reliability, so that the optimization results appear inefficient local optimal solutions

Method used

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  • Constrained damping plate optimization design method based on bidirectional evolutionary optimization algorithm
  • Constrained damping plate optimization design method based on bidirectional evolutionary optimization algorithm
  • Constrained damping plate optimization design method based on bidirectional evolutionary optimization algorithm

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Embodiment 1

[0065] The substrate of the constrained damping cantilever plate is an aluminum plate with a length of 0.2m, a width of 0.1m, a thickness of 2mm, and a density of 2800kg / m 3 , the modulus of elasticity is 70e9Pa, and Poisson's ratio is 0.3. Cover the surface of the aluminum plate with constrained damping material, the thickness of the damping material is 0.3mm, and the density is 1200kg / m 3 , the modulus of elasticity is 12e6Pa, Poisson's ratio is 0.495, and the loss factor is 0.5. Constraint material thickness is 0.5mm, density is 2700kg / m 3 , the modulus of elasticity is 70e9Pa, and Poisson's ratio is 0.3. Constraints The left end of the damper plate is fully constrained.

[0066] The constrained damping plate structure described in the present invention is formed by covering the damping material and the constrained layer corresponding to the damping material on an aluminum plate, and a finite element model of the constrained damping plate structure needs to be establishe...

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Abstract

The invention discloses a constrained damping plate optimization design method based on a bidirectional evolutionary optimization algorithm and belongs to the technical field of optimal structural designing. The method includes the steps of establishing a finite element model of constrained damping plate; establishing a topological optimization model; setting parameters of the bidirectional evolutionary optimization algorithm; calculating sensitivities of constrained damping plate structural units; gradually deleting low-efficiency ones of the constrained damping plate structural units by the bidirectional evolutionary optimization algorithm, and restoring high-sensitivity deleted ones of the constrained damping plate structural units; stopping iteration when constraint conditions are met, and outputting an optimal layout of constrained damping material. The method has the advantages that a modal loss factor of the constrained damping plate is maximized under certain usage of the constrained damping material, and the constrained damping plate structure effectively damps on the premise of no excess weight being added.

Description

technical field [0001] The invention relates to a structural optimization design method, in particular to an optimal design method of a constrained damping plate based on a bidirectional progressive optimization algorithm. Background technique [0002] The damping structure can effectively suppress the vibration and noise of the structure, especially the constrained damping plate structure has a good suppression effect on the broadband random vibration response, and is widely used in automobiles, aerospace, ships and other industries. In the traditional vibration reduction design of damping structures, the damping material is covered on the surface of the entire structure, which effectively suppresses structural vibration and noise while increasing the additional mass of the structure. Optimizing the layout of constrained damping materials can effectively improve the efficiency of constrained damping materials and reduce the amount of constrained damping materials used. [...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 郑玲房占鹏万浩川李以农
Owner CHONGQING UNIV
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