Broad-band sound absorption structure with zigzag cavity and microperforated board

Abstract

The invention belongs to the field of noise control, and in particular relates to a broad-band sound absorption structure with a zigzag cavity and a microperforated board. The structure comprises a bottom board 1, side walls 2, partition plates 3, a cover board 5, and microperforated holes 6, wherein the side walls 2 are tightly connected with the bottom board 1 and the cover board 5, so that an integral sound absorption back cavity is formed; the partition plates 3 are arranged in the sound absorption back cavity, and separate the integral back cavity into the zigzag cavity 4 alternately in sequence with the bottom board 1; the partition plates 3 are sequentially distributed in the back cavity at certain intervals and are closely connected with the side walls 2, and the distance and the number of the partition plates are adjustable, and the intervals between the adjacent partition plates are equal or similar; gaps are reserved between the partition plates 3 and the cover board 5, andthe height of the gaps can be the same or similar to the intervals among the partition plates; and the microperforated holes 6 of one or more different sizes are arranged in the cover board 5. For thebroad-band sound absorption structure, under the condition that the thickness of the back cavity of the microperforated board is not increased, the low-frequency sound absorption coefficient of a composite sound absorption structure is improved, the sound absorption frequency band of the structure is also effectively broadened, in addition, the structure is simple, the preparation cost is low, the application value is high, and the application range is wide.

Description

technical field [0001] The invention belongs to the field of noise control, and in particular relates to a broadband sound absorbing structure composed of a micro-perforated plate and a tortuous cavity. Background technique [0002] In the field of noise control, sound-absorbing materials or structures can be divided into two categories: porous sound-absorbing materials and resonance sound-absorbing structures. Common resonance sound-absorbing structures include thin-plate resonance sound-absorbing structures, perforated plates (including micro-perforations) Sound structure, micro-slit resonance sound absorption structure, etc. [0003] In engineering, porous sound absorbing materials have good sound absorption performance for medium and high frequency sound waves above 1000Hz, but their sound absorption performance for low frequency (below 1000Hz) sound waves is poor; in order to solve the sound absorption problem of low frequency sound waves, Often a resonant sound-absorb...

AI Technical Summary

Problems solved by technology

[0005] To sum up, in engineering, due to the limitations of structural design space and weight conditions, it is difficult for traditional sound-absorbing structures to achieve high-efficiency sound-absorbing effects on low-frequency and broadband sound waves

However, low-frequency and broadband sound absorption is a technical issue of great concern to those skilled in the art, and there is currently no document disclosing the method of combining meandering cavities and micro-perforated plates in the present invention to realize low-frequency broadband sound absorption

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