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The method of using super sound absorber to control the environment of low frequency noise

A technology of super sound absorber and low frequency noise, which is applied in the field of low frequency noise environment control by using super sound absorber to achieve the effect of small space, broad market prospect and low cost

Active Publication Date: 2020-05-08
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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  • The method of using super sound absorber to control the environment of low frequency noise
  • The method of using super sound absorber to control the environment of low frequency noise
  • The method of using super sound absorber to control the environment of low frequency noise

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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 Patents(China)
IPC IPC(8): G06F30/20G01H17/00G06F119/10
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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