Helmholtz resonator and low-frequency broadband sound absorption and noise reduction structure based on Helmholtz resonator

Abstract

The invention discloses a Helmholtz resonator and a low-frequency broadband sound absorption and noise reduction structure based on the Helmholtz resonator, the Helmholtz resonator comprises a Helmholtz resonator body, at least one embedded pipe is arranged in the Helmholtz resonator body, and the inner side surface of an opening of the Helmholtz resonator body wraps the outer side of one embeddedpipe; and all the embedded pipes are not in contact with one another. The low-frequency broadband sound absorption and noise reduction structure comprises a rigid frame, and at least two Helmholtz resonators are arranged in the frame side by side. The Helmholtz resonator disclosed by the invention not only realizes more excellent low-frequency and broadband sound absorption and noise reduction effects, but also more effectively reduces the thickness of the Helmholtz resonator; according to the low-frequency broadband sound absorption and noise reduction structure, the sound absorption effectof each weak sound absorption Helmholtz resonator is improved in an existing low-frequency broadband sound absorption and noise reduction structure, and then efficient sound absorption is achieved ina wider frequency range through the thin low-frequency broadband sound absorption structure.

Description

technical field [0001] The invention relates to the technical field of low-frequency vibration reduction and noise reduction, in particular to a Helmholtz resonator and a low-frequency broadband sound absorption and noise reduction structure based on the Helmholtz resonator. Background technique [0002] Low-frequency noise has always been an important and difficult point in noise control engineering. In traditional noise control engineering, acoustic materials can only control noise with a wavelength equivalent to the material scale. To reduce low-frequency noise, it is necessary to design the thickness of the sound-absorbing material to the order of decimeters or even meters. Obviously, it brings a lot of inconvenience to noise control. At the same time, traditional acoustic materials such as sound-absorbing cotton still have problems such as being unusable at low temperatures and having a short service life. [0003] In order to solve the problems in traditional noise co...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the thickness of the low-frequency broadband sound-absorbing and noise-reducing structure in the existing noise control engineering is relatively large, and there is a high acoustic impedance design requirement when coupling it; at the same time, through the existing single resonator The low frequency broadband sound absorption and noise reduction structure obtained by coupling not only has the problem of increased thickness, but also has the problem of multiple sound absorption troughs in the low frequency broadband sound absorption and noise reduction structure due to coupling, which seriously affects the performance of the broadband sound absorption and noise reduction structure. Effect

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