Low-frequency broadband multilayer sound absorption device for small mechanical unit plane arrays

Abstract

The invention discloses a low-frequency broadband multilayer sound absorption device for small mechanical unit plane arrays and belongs to the technical field of noise control. The low-frequency broadband multilayer sound absorption device is characterized in that acoustic material layers and the small mechanical unit plane arrays are installed in an alternating mode in front of a back wall on which sound wave reflection needs to be reduced so that low-frequency broadband sound absorption can be achieved; the small mechanical unit plane arrays are formed by embedding small mechanical units on a board; the small mechanical units are composed of racks, sound wave input components, forward amplification mechanisms or backward amplification mechanisms, sound wave output components and dampers or damping materials; the acoustic material layers are made of porous sound absorption materials and are different in acoustic impedance. According to the small mechanical unit plane arrays, on the one hand, the size of a sound absorption structure is reduced through impedance changing, and on the other hand, low-frequency broadband sound absorption is achieved through the dampers based on acoustic wave resonance of the small mechanical arrays and the acoustic material layers. The low-frequency broadband multilayer sound absorption device has the advantages that the device is quite different from an existing multilayer sound absorbing structure in terms of the working principle, has great advantages in terms of low-frequency broadband wave absorption and is particularly suitable for hiding of underwater submarines.

Description

technical field [0001] The invention belongs to the technical field of environmental noise control and relates to a low-frequency broadband multi-layer sound-absorbing structure, in particular to a low-frequency broadband multi-layer sound-absorbing device suitable for underwater submarine stealth and small mechanical unit plane array. Background technique [0002] At present, many scholars and engineers at home and abroad are conducting research on multi-layer sound-absorbing structures, either for civilian or military use. Generally speaking, the relevant literature and patents at home and abroad are mainly based on sound-absorbing materials or Helmertz resonant cavities to design broadband sound-absorbing structures. In the air, micro-perforated plates or porous sound-absorbing materials are generally used to design sound-absorbing structures, and in water, hydroacoustic rubber with special hole patterns is generally used to design sound-absorbing tiles. However, these s...

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Problems solved by technology

So far, there have been no research reports, documents or patents on the multi-layer sound-absorbing structure embedded in the planar array of small mechanical units at home and abroad.

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