Wideband sound absorption unit plate

Abstract

The invention relates to a wideband sound absorption unit plate and belongs to the field of noise reduction by sound absorption. The sound absorption unit plate mainly comprises a sound insulation plate cavity, a resonant thin plate or a resonant thin film, a perforated or micro-perforated plate, an aluminum fiber plate and a shell. The sound absorption unit plate has a layered structure and comprises the aluminum fiber plate, the perforated or micro-perforated plate, the resonant thin plate or the resonant thin film and the sound insulation plate cavity in sequence from the front face to the rear face, and the shell is packaged around the other four faces, except for the front face and the rear face, of the unit plate. The sound absorption unit plate is wide in sound absorption frequency band, and especially the sound absorption effect at the low frequency band is greatly improved. The wideband sound absorption unit plate is simple in structure, low in weight, easy to machine and manufacture, wide in application range and capable of being applied to noise reduction by sound elimination in places of indoor walls, outdoor sound barriers, station platforms, railway lines and the like.

Description

technical field [0001] The present invention relates to a wide-band sound-absorbing unit plate, in particular to a composite absorber that combines low-frequency sound absorption with resonant thin plates or resonant films, low-frequency sound absorption with perforated or micro-perforated plates, and medium and high-frequency sound absorption with porous fiber sound-absorbing structures. The acoustic structure belongs to the field of sound absorption and noise reduction. Background technique [0002] Noise pollution not only seriously interferes with people's daily life, but also endangers health if exposed to noise for a long time. With the rapid development of high-speed railways in my country, vehicles are traveling faster and faster. Noise reduction facilities need to be arranged along the railway and in the platform area, such as installing sound barriers on both sides of the high-speed railway and installing sound-absorbing panels in the platform. [0003] Porous sou...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of narrow sound-absorbing frequency band faced by existing sound-absorbing materials or structures, and to provide a wide-band sound-absorbing unit board combining multiple sound-absorbing principles

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