Broadband sound absorption structure

Abstract

The invention belongs to the technical field of sound absorption, and discloses a broadband sound absorption structure. The broadband sound absorption structure comprises a shell, a sound absorption cavity is formed in the shell, an opening communicated with the sound absorption cavity and the external environment is formed in the shell, and a perforated plate or a thin film used for noise input is fixed to the opening in a sealed mode; the structure also comprises independent sub sound absorption cavities which are formed in the sound absorption cavity, and each sub sound absorption cavity isprovided with a perforated plate or a film for inputting noise in the sound absorption cavity; the sub sound absorption cavities are constructed to be different in cavity size, so that noise of the external environment enters the sound absorption cavities, and after the noise enters the sub sound absorption cavities, the noise of the corresponding frequency band can be absorbed through the cavities, with different sizes, of the sub sound absorption cavities, and broadband sound absorption of the noise is achieved. The broadband sound absorption structure is small in size and good in sound absorption effect on low-frequency noise.

Description

technical field [0001] The invention belongs to the technical field of sound absorption, and in particular relates to a broadband sound absorption structure. Background technique [0002] Noise is a sound wave with rich frequency components, including three frequency domains of medium, high and low, and is a kind of mechanical energy. Noise pollution has caused great damage to people's hearing, physiology and even psychology, and has become an urgent problem to be solved in work, life and travel. Therefore, sound-absorbing structures (or sound-absorbing materials) are often used in daily life to absorb and reduce noise. For the middle and high frequency domains of the noise, due to the middle and high frequency domains, the friction between the sound wave and the sound-absorbing structure (or sound-absorbing material) is more severe, so that the sound wave is lost to a greater extent, thus affecting the noise in the middle and high frequency domain. Noise has a good sound ...

AI Technical Summary

Problems solved by technology

However, in order to obtain a better low-frequency sound absorption effect, it is usually necessary to increase the thickness of the structure to increase the contact area, which will lead to excessive volume and weight, and the low-frequency frequency range of sound absorption is only limited to the vicinity of the resonance frequency, so its Sound absorption frequency domain is narrow

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