Vibration damping and noise reduction device of acoustic black hole

A vibration reduction and noise reduction, black hole technology, applied in the direction of sound-producing equipment, non-rotation vibration suppression, instruments, etc., can solve the problems such as the reduction of the strength of the noise-reduced structure, application, stress concentration, etc., to make up for the effect of vibration reduction and noise reduction.

Active Publication Date: 2018-06-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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  • Vibration damping and noise reduction device of acoustic black hole
  • Vibration damping and noise reduction device of acoustic black hole
  • Vibration damping and noise reduction device of acoustic black hole

Examples

Experimental program
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Embodiment

[0044] 1. Calculation model

[0045] A square pipe with a side length of 200mm and a length of 0.6m is selected as the structure to be noise-reduced. The two ends of the square pipe simulate the no-reflection condition, and three acoustic black holes are added at equal intervals in the axial direction on the inner surface of the elastic wall of the pipe. The vibration and noise reduction device has a diameter of 120mm, a thickness of 20mm, and an edge thickness of 0.2mm. It is also designed with aluminum. The ring-shaped damping gasket on the acoustic black hole vibration and noise reduction device is arranged in a ring with butyl rubber of equal thickness of 1.2mm, and the acoustic black hole vibration and noise reduction device is 8% of the mass of the original elastic wall structure. At the same time, in order to do a comparative study, the inner surface of the elastic wall is added with a uniform mass-damping plate with the same dimension and quality as the acoustic black ...

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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, 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...

Claims

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Application Information

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IPC IPC(8): G10K11/16G10K11/172F16F15/02
CPCG10K11/16G10K11/172F16F15/02
Inventor 季宏丽王小东裘进浩黄薇韩冰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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