Double-layer-board sonic black hole vibration and noise reduction structure

Abstract

The invention discloses a double-layer-board sonic black hole vibration and noise reduction structure. The double-layer-board sonic black hole vibration and noise reduction structure is formed by combining two plate structures A1, wherein each plate structure A1 comprises a uniform area and a sonic black hole area connected with the uniform area, after the two plate structures A1 are placed together vertically, the sonic black hole areas are assembled to form a cavity area, and the cavity area is filled with a damping material and a sound absorption material. According to the double-layer-board sonic black hole vibration and noise reduction structure, the intrinsic material of the plate structures is removed, the high-efficiency energy absorption or vibration and noise reduction can be realized by combining with a small amount of damping material and sound absorption material, wherein the damping material consumes the most bending wave energy, so that the purpose of energy absorption or vibration control is achieved, the sound absorption material dissipates the transmitted energy, and thus the purpose of efficient energy absorption or vibration and noise reduction is achieved.

Description

Technical field: [0001] The invention relates to a double-layer plate acoustic black hole vibration reduction and noise reduction structure, which belongs to the technical field of structural vibration reduction and noise reduction. Background technique: [0002] The essential cause of structural vibration and noise radiation can usually be attributed to the propagation effect of elastic waves in the structure, as well as the interaction between structural elastic waves and the surrounding acoustic medium (such as air, water). Therefore, manipulating the elastic wave behavior in structures is an effective means to achieve structural vibration and noise reduction. Wave manipulation methods can be divided into two categories: active methods and passive methods. Active methods generally require external energy, and the system implementation is relatively complicated, and there is still a certain distance from practicality. Therefore, passive methods are generally used in engin...

AI Technical Summary

Problems solved by technology

[0005] The thickness of the edge of an ideal ABH structure can be gradually reduced to zero to achieve the effect of a black hole where waves do not reflect at all at the edge. However, for actual processing and engineering application requirements, the acoustic black hole still has certain technical deficiencies, and the edge of the actual structure cannot be infinite. close to zero, there is often a truncation thickness, but a very small truncation thickness will have a serious impact on the black hole effect, so it cannot be used as an ideal trap

At the same time, the reduction in thickness will also bring about a serious problem, that is, it will lead to stress concentration and reduce the structural strength. In practical applications, it is necessary to solve the problem of ensuring the structural strength of a single-layer acoustic black hole.

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