Wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates

A mechanical impedance, micro-perforated plate technology, applied in the direction of sound-producing instruments, instruments, etc., can solve the problems of poor high-frequency sound absorption, complex structure, occupying a large space, etc., and achieve the effect of sound absorption frequency bandwidth
CN103700366AInactive Publication Date: 2014-04-02JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2014-04-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a wideband sound absorption structure combing mechanical impedance of composite resonance cavities with micropunch plates, and belongs to the technical field of environmental noise control. The wideband sound absorption structure comprises one or more layers of micropunch plates in the front of the structure and a mechanical impedance plate at the rear part of the structure, wherein the micropunch plates and the mechanical impedance plate are all fixed on a bracket; the mechanical impedance plate is formed by an elastically supported thin plate; Helmholtz resonance cavities are compositely arranged on the mechanical impedance plate; each Helmholtz resonance cavity consists of a cavity body and an insertion tube. According to the wideband sound absorption structure, Helmholtz resonance units are designed on the mechanical impedance plate, and the thicknesses of the resonance cavities are smaller, thus the whole structural thickness does not change too much. The micropunch plates can have good sound absorption effect for middle-frequency and high-frequency noises, and a plurality of absorption peaks can be generated at low frequency through a mechanical impedance unit and the Helmholtz resonance units, so that the whole structure can ensure good middle-frequency and high-frequency sound absorption performance and also has good sound absorption effect at low frequency.
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Description

technical field

[0001] The invention relates to the sound absorption technology in the field of noise control, which combines the mechanical impedance compounded with the resonant cavity and the air impedance composed of the cavity, and is characterized in that the middle and high frequency And low frequency have good sound absorption performance. Background technique

[0002] Sound-absorbing technology is the core of noise control engineering. There are many sound-absorbing materials. Traditional porous fibrous materials have the disadvantage of secondary pollution. In 1975, Professor Ma Dayou published an article on "Theory and Design of Micro-perforated Plate Sound Absorption Structure", which uses the sound resistance of micro-perforation combined with the cavity to absorb sound. It is characterized by no need to add additional sound-absorbing materials. It is a green and environmentally friendly sound-absorbing structure, and its application in engineering has been wid...

Claims

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