A kind of low frequency vibration reduction metamaterial composite damping plate

Abstract

The invention introduces a low-frequency vibration-reducing supermaterial composite damping plate, which includes a plate body, the plate body is composed of a first upper composite layer, a middle layer and a first lower composite layer, the first upper composite layer and the first lower composite layer The layers are all fiber composite material layers, the middle layer is a viscoelastic film damping layer, and the first upper composite layer and the middle layer and the first lower composite layer and the middle layer are bonded by viscofluid damping rubber; A hole array is opened on the plate body, and a mass sheet is respectively installed in each hole, and the mass sheet is embedded on the viscoelastic film damping layer. The present invention has both multi-layer damping and vibration reduction and acoustic metamaterial low-frequency vibration isolation functions, has outstanding advantages such as strong low-frequency attenuation ability, easy to realize frequency-selective attenuation, and good environmental protection performance; the structure can be used for vibration control within 1000 Hz, Compared with traditional materials, the vibration and noise reduction performance has been greatly improved, and it can be used for the reduction, isolation and control of low-frequency vibration and noise in automobiles, ships and other equipment.

Description

technical field [0001] The invention belongs to the intersecting fields of vibration and noise control and functional composite materials, and in particular relates to a low-frequency vibration-reducing supermaterial composite damping plate structure. Background technique [0002] Low-frequency vibration and noise problems are ubiquitous in equipment such as automobiles, trains, aircraft, and ships. Due to the slow attenuation and strong penetration of low-frequency vibration and noise capabilities, it is difficult to obstruct and control them, which seriously restricts the performance of these equipment. The ride comfort even directly affects the equipment operation and the health and life safety of the passengers. [0003] In actual engineering, sound insulation materials and damping materials are often used to reduce low-frequency vibration and noise. However, when traditional sound insulation materials are used to isolate sound waves and vibrations, the thickness of the...

AI Technical Summary

Problems solved by technology

[0005] To sum up, for the problem of low-frequency vibration isolation below 1000 Hz, especially within 200 Hz, the existing damping plate either cannot meet the requirements of low-frequency reduction and vibration isolation; or the structure is too bulky, and the space conditions or costs do not allow it; It is effective for a single frequency or a narrow frequency band; therefore, a new type of damping plate with a wide frequency band and meeting the requirements of low frequency reduction and vibration isolation is urgently needed

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