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Research method of low frequency noise processing using comsol and resonant cavity model

A low-frequency noise, resonant cavity technology used in the analysis of solids using sonic/ultrasonic/infrasonic waves

Active Publication Date: 2020-10-20
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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  • Research method of low frequency noise processing using comsol and resonant cavity model
  • Research method of low frequency noise processing using comsol and resonant cavity model
  • Research method of low frequency noise processing using comsol and resonant cavity model

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Embodiment Construction

[0025] Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

[0026] A kind of research method that utilizes COMSOL and resonant cavity model to carry out low-frequency noise processing, is characterized in that, comprises the following steps:

[0027] Step 1. Make resonator models of different specifications;

[0028] Such as figure 1 As shown, the resonant cavity model consists of two parts: the resonant cavity body and the resonant cavity cover. The resonant cavity is made of PLA material 3D printer, and the resonant cavity is a hollow cylinder with one end open. The resonant cavity cover is made of evenly stretched elastic film, and the resonant cavity cover just covers the open end of the resonant cavity and is fixed with silica gel, thus forming a closed resonant cavity model. The three parameters of the resonator model are height h, diameter d, and film thickness a.

[0029] In order to use the controlled...

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Abstract

The invention relates to a research method for conducting low-frequency noise processing by using COMSOL and resonant cavity models. The method includes the steps that firstly, resonant cavity modelsof different specifications are made; secondly, first detection groups are placed in B&K type 4206 impedance tubes respectively for sound reduction index testing, and second detection groups are placed in B&K type 4206 impedance tubes respectively for sound reduction index testing; thirdly, theoretical simulation of resonant cavity sound absorption is conducted by using COMSOL software until theoretical data fitted by the COMSOL software is basically consistent with experimental data in the second step; fourthly, expansion simulation of resonant cavity sound absorption continues to be conducted through a control variable method by using the COMSOL software, and finally an influence curve of film thickness and diameter on the sound absorption effect is determined. According to the film typeresonant cavity with adjustable parameters, the absorption frequency and absorption coefficient of the peak value are adjusted by changing the size of the models and the thickness of elastic films, theoretical simulation is conducted by using the COMSOL software, and specific absorption at a specific frequency is realized with the least space, the minimum material consumption and the lowest cost.

Description

technical field [0001] The invention relates to the technical field of low-frequency noise processing, in particular to a research method for low-frequency noise processing using COMSOL and a resonant cavity model. 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 to a ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/04
Inventor 刘安平黄映洲孙晓楠谭红兵李鑫
Owner CHONGQING UNIV
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