Multi-layer nested low frequency broadband sound absorption device based on resonance sound absorption
A sound-absorbing device and resonance sound-absorbing technology, which is applied in the direction of sound-emitting devices and instruments, can solve the problems of poor absorption effect, large volume, narrow absorption frequency band, etc., and achieve widening of the sound absorption frequency band, widening the sound absorption frequency band, and adjustable lifting sexual effect
Active Publication Date: 2022-07-12
SHANGHAI JIAOTONG UNIV
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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
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[0026] like Figure 1-Figure 6 As shown, the present embodiment relates to a multi-layer nested low-frequency broadband sound absorption 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 baffles 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 bottom plate is provided with an inner diameter and a height in order from the inside to the outside Enlarged shell, the upper end of the shell is sealed with a baffle with a neck short tube.
[0027] The centers of the bottom plate, the shell, the partition plate and the neck short tube are on the same straight lin...
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A multi-layer nested low-frequency broadband sound absorption device based on resonance sound absorption, comprising: several resonator units nested in sequence, each resonator unit comprising: a bottom plate, a shell, a baffle and a neck short tube, Wherein: the partition plate and the bottom plate are respectively arranged at the two ends of the shell, and the neck short tube is arranged through the center of the partition plate to realize multi-order resonance through the mutual coupling between different-level resonator units, thereby broadening the absorption frequency band. The invention widens the absorption frequency band based on the principle of multi-order resonance, and improves the adjustability of the sound absorption coefficient and the absorption peak frequency. Compared with the existing structure, the present invention has small volume and light weight, has broadband sound absorption performance in the low frequency range, and has good application prospect 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 absorption device based on resonance sound absorption. Background technique [0002] Most of the existing porous sound-absorbing materials use melamine and asbestos, but these materials have poor sound-absorbing effect on low-frequency noise. The Helmholtz resonator composed of small holes and cavities has the largest vibration amplitude around the small holes near its resonant frequency, and the sound energy dissipation is maximized due to the viscous effect. A good sound absorption effect is produced near the resonant frequency, but the range of use is limited due to the narrow absorption frequency band. In the 1970s, the micro-perforated resonant sound-absorbing structure proposed by Academician Ma Dayou produced a broadband sound absorption phenomenon near its resonance frequency, but for low-frequency sound a...
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IPC IPC(8): G10K11/172
CPCG10K11/172
Inventor 朱俊喆瞿叶高孟光
Owner SHANGHAI JIAOTONG UNIV