Moving body acoustic field measuring method based on random microphone array

A technology for microphone arrays and moving objects, which is used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., and can solve problems such as low efficiency

Inactive Publication Date: 2010-04-07
TSINGHUA UNIV
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Problems solved by technology

Among them, the layout of the random array can effectively overcome the side lobe effect of the regular array through the irregular arrangement of the microphones, and improve the accuracy of sound source identification; the current optimization method for the two-dimensional random array layout is generally inefficient and requires a lot of calculations to find a layout with better performance

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  • Moving body acoustic field measuring method based on random microphone array
  • Moving body acoustic field measuring method based on random microphone array
  • Moving body acoustic field measuring method based on random microphone array

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Embodiment Construction

[0038] Below in conjunction with the accompanying drawings, the method for measuring the sound field of moving objects based on random microphone arrays proposed by the present invention is introduced in detail. The scene where the method of the present invention is used for measuring the sound field of moving objects is shown in the attached figure 1 shown.

[0039] (1) Set the shortest distance between the measuring microphones as d,

[0040] where c is the speed of sound, f max For the set maximum measurement analysis frequency;

[0041] (2) As attached figure 2 As shown, let the length of the array plane A where the above-mentioned measurement microphone is located be L 1 , with a height of H 1 , the length of the plane R where the moving object is located is L 2 , with a height of H 2 , the vertical distance between array plane A and plane R is D, and the length of array plane A is L 1 and height H 1 It is an integer multiple of the above-mentioned shortest dis...

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Abstract

The invention relates to a method for measuring a sound field of moving body based on a random microphone arrays, and belongs to the technical field of noise analysis and control. A 2D random microphone array layout is designed by a step of generating the random microphone arrays based on an array unit, a step of counting and screening the random microphone arrays according to a baseline vector, and a step of computing and evaluating the random microphone arrays in a simulation manner; the random microphone sensor array is built according to the array layout to measure the sound field of the moving body. By adopting the method, the randomicity of the microphone layout is reduced, and the search space in layout design is reduced; a baseline statistical indicator is applied to pre-filteringthe array layout which does not satisfy the requirements, which reduces the computational complexity of performance verification, and improves the search efficiency; the performances of the random microphone arrays of different frequencies are verified by simulation computation to ensure that the obtained arrays satisfy the measurement use requirements. A moving body sound field measurement systemcan determine the random microphone array layout in a short time, and realize more accurate positioning and analysis of a moving sound source by the method.

Description

technical field [0001] The invention relates to a method for measuring the sound field of a moving object based on a random microphone array, and belongs to the technical field of noise analysis and control. Background technique [0002] The noise of complex moving machinery such as automobiles and trains has a great impact on the environment. Accurately identifying and locating the main sound-generating components can provide a basis for noise control work, and is of great significance to noise measurement and control work. Due to the movement, for this type of (multi-sound source) motion noise, it is more difficult to obtain its sound field more accurately, distinguish each sound source, and accurately locate it. [0003] At present, the main acoustic holographic method and array method are used in the world to measure and analyze the sound field of moving sound sources of vehicles in the world. The holographic method to measure the moving sound field is greatly affected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 杨殿阁连小珉郑四发罗禹贡李克强王建强李兵邵林
Owner TSINGHUA UNIV
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