An acoustic black hole vibration and noise reduction device

Abstract

The invention discloses a vibration and noise reduction device. The vibration and noise reduction device includes a disc-shaped structure whose distance between the upper and lower surfaces gradually decreases from the central axis to the outer edge. The disc-shaped structure includes a black hole area. The distance between the upper and lower surfaces of the black hole area changes in the form of a power exponential from the central axis to the outer edge. By attaching the disc-shaped structure to the noise-reduced structure, the vibration and noise reduction of the noise-reduced structure is achieved. There is no need to weaken the thickness of the noise-reduced structure, and the limitations of local high dynamic response and structural strength reduction of the noise-reduced structure are avoided.

Description

technical field [0001] The invention relates to the field of vibration reduction and noise reduction, in particular to an acoustic black hole vibration reduction and noise reduction device. Background technique [0002] The noise in acoustic media such as air and water originates, on the one hand, from the propagation effect of elastic waves in the structure, and the mutual coupling between the structural elastic wave and the surrounding acoustic medium (structural sound), on the other hand, it is due to the interaction of sound field acoustic waves (air Voice). Therefore, the control of noise in the acoustic medium should be carried out from the above two directions, that is, to control the elastic wave behavior in the structure and the sound wave in the air, so as to reduce vibration and noise in the acoustic space. Wave manipulation methods can be divided into two categories: active methods and passive methods. Active methods generally require external energy, and the s...

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Problems solved by technology

[0005] However, the traditional acoustic black hole achieves the goal by weakening the thickness of the noise-reduced structure. In this way, the reduction of the thickness will bring about a serious problem, which is to lead to stress concentration, resulting in a decrease in the strength of the noise-reduced structure, which cannot be used in practical engineering applications.

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