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Vector microphone array-based low-frequency noise source high-precision positioning method

A microphone array, low-frequency noise technology, applied in positioning, instruments, measuring devices, etc., can solve the problems of difficult operation, large sound source positioning error, etc., to achieve the effect of small number, small size, and avoiding the generation of cross terms

Inactive Publication Date: 2018-09-21
STATE GRID SHAANXI ELECTRIC POWER RES INST +2
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Problems solved by technology

This method is not easy to operate and has a large error in positioning the sound source
[0005] In short, the existing methods have certain defects and deficiencies in the location of noise sources in the complex environment of substations. Therefore, new methods and technical approaches must be found

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  • Vector microphone array-based low-frequency noise source high-precision positioning method
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  • Vector microphone array-based low-frequency noise source high-precision positioning method

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Embodiment Construction

[0038] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0039] The present invention is based on a vector microphone array low-frequency noise source high-precision positioning method, combined with an array signal processing method and a frequency-domain phase calibration synthetic aperture technology, and adopts a vector microphone array to collect sound field data. The vector microphone consists of a traditional sound pressure sensor and three measurement directions. Composed of vibration velocity sensors perpendicular to each other, the three-dimensional vibration velocity in space can be measured in x, y, and z directions through three vibration velocity sensors, providing more complete sound field information. In the complex noise environment of the substation, the use of vector The microphone array collects broadband noise signals at differe...

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Abstract

The invention provides a vector microphone array-based low-frequency noise source high-precision positioning method. The vector microphone array-based low-frequency noise source high-precision positioning method is accurate in sound field distribution and noise source position measurement, and is particularly suitable for positioning a transformer substation low-frequency noise source under the near field condition. According to the vector microphone array-based low-frequency noise source high-precision positioning method, broadband noise signals are acquired in different positions of the noise environment space of the transformer substation by the vector microphone array; moreover, one reference vector microphone is fixed to continuously sample noise fields in the selected position, the signal acquired by the array and the signal acquired by the reference vector microphone are subjected to phase calibration in a frequency domain, and data is equivalent to the signal acquired by a large array at the corresponding time, so that large array pore diameter is synthesized and high-precision positioning of the low-frequency noise source is realized.

Description

technical field [0001] The invention belongs to the field of noise measurement and array signal processing, and relates to high-precision positioning of low-frequency noise sources of vector microphone arrays under near-field conditions, in particular to a high-precision positioning method of low-frequency noise sources based on vector microphone arrays. Background technique [0002] The noise pollution control of power transmission and transformation projects has become a new focus of environmental protection in the power industry today. The ways of noise control can be divided into the following three categories: controlling noise sources, controlling transmission routes and protecting receivers. Of the three, controlling the noise source is the most effective method. Controlling noise sources begins with measuring the location of the noise source. The noise measurement methods mainly include traditional measurement methods and methods based on array signal processing. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 吴健耿明昕杨坤德吕平海路达申晨赵明宇樊创韩文赵亚林王绿
Owner STATE GRID SHAANXI ELECTRIC POWER RES INST
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