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Method for carrying out low-frequency noise environmental governance by utilizing super sound absorber

A super-sound absorber and low-frequency noise technology, which is applied in the field of low-frequency noise environmental control using super-sound absorbers to achieve the effects of small space, low cost, and broad market prospects

Active Publication Date: 2018-08-03
CHONGQING UNIV
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Problems solved by technology

Various forms of membrane resonators have been proven to achieve sub-wavelength perfect absorption through hybrid resonance, but the current membrane resonators use coins on the membrane to create hybrid eigenstates that distinguish elastic modes

Method used

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  • Method for carrying out low-frequency noise environmental governance by utilizing super sound absorber
  • Method for carrying out low-frequency noise environmental governance by utilizing super sound absorber
  • Method for carrying out low-frequency noise environmental governance by utilizing super sound absorber

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Embodiment Construction

[0028] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

[0029] A method for controlling low-frequency noise environment using a super-sound absorber, comprising the following steps:

[0030] Step 1. Measure the noise frequency f of the low-frequency noise source with a noise measuring instrument. For example, the transformer room and air conditioner are the main sources of low-frequency noise. The noise frequency of the former is about 199Hz, and the noise frequency of the latter is about 314Hz.

[0031] Step 2: Determine the height h of the super sound absorber according to the spatial distance between the cover of the low-frequency noise source and the low-frequency noise source, and 2cm≤h≤10cm. The low-frequency noise source is usually covered by an enclosure (usually a closed space, such as a soundproof room). In order to reduce noise pollution, a super sound absorber is arranged on the inner wall of the e...

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Abstract

The invention relates to a method for carrying out low-frequency noise environmental governance by utilizing a super sound absorber. The method comprises the following steps of: 1, measuring a noise frequency of a low-frequency noise source; 2, determining a height of the super sound absorber according to a space distance between a cover of the low-frequency noise source and the low-frequency noise source; 3, manufacturing super sound absorber models in different specifications; 4, respectively putting a first detection group and a second detection group into a B&K type 4206 impedance tube tocarry out sound reduction index test; 5, carrying out theoretical simulation on resonant cavity sound absorption by utilizing COMSOL software until theoretical data fit by the COMSOL software is basically consistent with experimental data in the step 4; 6, carrying out extended simulation on the resonant cavity sound absorption by adoption of a control variable method by utilizing the COMSOL software and finally determining a film thickness and a diameter; and 7, manufacturing a plurality of super sound absorbers and fixed the bottoms of the super sound absorbers on the inner wall of the coverof the low-frequency noise source. According to the method, specificity absorption at specific frequencies is realized via minimum space and material and lowest cost.

Description

technical field [0001] The invention relates to the technical field of low-frequency noise processing, and in particular relates to a method for treating low-frequency noise environment by using a super-sound absorber. Background technique [0002] Noise cancellation plays an important role in our daily life, especially for low frequency noise (between 50 and 500Hz). Due to its high penetrating power, it is still a very difficult task to realize the effective absorption of low-frequency noise. Conventional materials that absorb sound, such as brick and concrete walls, can provide noise attenuation for mid- and high-frequency frequencies. However, its thickness of nearly half a meter is required to fully absorb noise around 300Hz. With the development of sound-absorbing properties of new materials, such as porous fibrous materials, perforated or microporous porous plates with a certain depth of tuning cavities behind the surface, the required material thickness is reduced t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01H17/00
CPCG01H17/00G06F30/20G06F2119/10G06F2219/10
Inventor 刘安平黄映洲孙晓楠谭红兵李鑫
Owner CHONGQING UNIV
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