Broadband low frequency acoustics silencer

Abstract

The invention discloses a broadband low frequency acoustics silencer comprising an air duct; a plurality of sets of noise abatement structures are distributed at equal intervals along sound wave propagation directions around the duct; the noise abatement structure set comprises four noise abatement structure units symmetrically arranged with respect to the air duct; a single structure unit comprises at least two nested shells with a cross section as an opening straight-flanked ring; the ring openings of adjacent shells are opposite in direction and coplane; two ends of the shell are sealed viaend plates. The broadband low frequency acoustics silencer has no special requirement for making materials, as long as the material is considered as an acoustics rigid material in air; the broadbandlow frequency acoustics silencer is easy to make, very convenient in real promotion and application, and has no environment pollution; the broadband low frequency acoustics silencer can effective inhibit noises in a broad low frequency range, can contract the whole volume, is compact in structure, suitable for noise abatement noise reduction of existing miniature integrated equipment, can realizevery good ventilation performance, and has a very strong practicality.

Description

technical field [0001] The invention relates to a broadband low-frequency acoustic muffler, which belongs to the field of acoustics. Background technique [0002] Most of the traditional mufflers suppress noise by adding porous fiber materials to the structure, but the noise reduction effect is poor in the low frequency range, and the pores of porous materials are easy to accumulate dust and bacteria, which will affect the environment and human health. In recent years, with the rapid development of acoustic metamaterials, their acoustic properties different from those of natural materials have attracted extensive attention, and many mufflers with subwavelength dimensions have been proposed and used for low-frequency noise control. However, with the rapid development of information technology, equipment tends to be small and integrated, and there are conflicts between noise control and ventilation inside the equipment. The existing noise reduction structure has gradually fail...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a broadband low-frequency acoustic muffler, which can effectively suppress the low-frequency noise of the equipment, and at the same time achieve good ventilation performance, and has a compact structure and conforms to the existing Equipment noise control needs

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