Vibration damping and noise reduction device of acoustic black hole

Abstract

The invention discloses a vibration damping and noise reduction device of an acoustic black hole. The vibration damping and noise reduction device comprises a disk-shaped structure whose distance between upper and lower surfaces is reduced gradually from the central axis to the external periphery, the disk-shaped structure comprises a block hole area, the distance between upper and lower surfacesof the black hole area is changed in the form of power exponent from the central axis to the external periphery, the disk-shaped structure is added to a noise reduced structure to carry out vibrationdamping and noise reduction on the noise reduced structure, the thickness of the noise reduced structure needs not to be reduced, and the noise reduced structure is avoided from locally high dynamic response or reduction of the structural intensity.

Description

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

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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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