Multilayer nested low-frequency broadband sound absorption device based on resonance sound absorption

A sound-absorbing device and resonant sound-absorbing technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of poor absorption effect, narrow absorption frequency band, and large volume, and achieve the effects of light weight, widening sound absorption frequency band, and small volume

Active Publication Date: 2021-03-16
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects of the prior art that it is difficult to absorb broadband sound in the low-frequency range, the low-frequency sound-absorbing structure is bulky, the absorption effect is poor, and the absorption frequency band is narrow, the present invention proposes a multi-layer nested low-frequency broadband sound-absorbing device based on resonance sound absorption , Based on the principle of multi-order resonance, the absorption frequency band is broadened, and the adjustability of the sound absorption coefficient and the absorption peak frequency is improved

Method used

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  • Multilayer nested low-frequency broadband sound absorption device based on resonance sound absorption
  • Multilayer nested low-frequency broadband sound absorption device based on resonance sound absorption
  • Multilayer nested low-frequency broadband sound absorption device based on resonance sound absorption

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Embodiment Construction

[0026] Such as Figure 1-Figure 6 As shown, this embodiment relates to a multi-layer nested low-frequency broadband sound-absorbing structure, which adopts but is not limited to a four-layer nested structure. Taking the four-layer structure as an example, it includes: four sequentially nested resonator units , specifically: the bottom plate 1, the first shell 2, the second shell 3, the third shell 4, the fourth shell 5, the first partition 6, the second partition 7, the third partition 8, the first partition Four partitions 9, the first neck short tube 10, the second neck short tube 11, the third neck short tube 12 and the fourth neck short tube 13, wherein: the inner diameter and height are arranged on the bottom plate in order from inside to outside Enlarged housing, the upper end of the housing is sealed with a partition provided with a short neck tube.

[0027] The centers of the bottom plate, the shell, the partition, and the short neck tube are on the same straight line...

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Abstract

A multilayer nested low-frequency broadband sound absorption device based on resonance sound absorption comprises a plurality of resonator units which are nested in sequence, each resonator unit comprises a bottom plate, a shell, a partition plate and a neck short pipe, the partition plates and the bottom plates are arranged at the two ends of the shells respectively, and the neck short pipes arearranged in the centers of the partition plates in a penetrating mode. Multi-order resonance is achieved through mutual coupling between different stages of resonator units, and then the absorption frequency band is broadened. The absorption frequency band is broadened based on the multi-order resonance principle, and the adjustability of the sound absorption coefficient and the absorption peak frequency is improved. Compared with an existing structure, the broadband sound absorption device is small in size and light in weight, has broadband sound absorption performance in a low-frequency range, and has good application prospects and industrial value.

Description

technical field [0001] The invention relates to a technology in the field of noise processing, in particular to a multi-layer nested low-frequency broadband sound-absorbing device based on resonance sound absorption. Background technique [0002] Most of the existing porous sound-absorbing materials are melamine and asbestos, but these materials have poor sound-absorbing effect on low-frequency noise. The Helmholtz resonator composed of small holes and cavities, near its resonant frequency, the vibration amplitude of the air around the small holes is the largest, and the sound energy dissipation is maximized due to the viscous effect, so the Helmholtz resonator in its A good sound absorption effect is produced near the resonance frequency, but the scope of application is limited due to the narrow absorption frequency band. In the 1970s, the micro-perforated resonance sound-absorbing structure proposed by Academician Ma Dayou produced a broadband sound absorption phenomenon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 朱俊喆瞿叶高孟光
Owner SHANGHAI JIAO TONG UNIV
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