Method for positioning sound source in airflow environment

A sound source localization and airflow technology, which is applied in positioning, aerodynamic tests, machine/structural component testing, etc., can solve the problems of large deviation of positioning results, large amount of calculation, and many side lobe values, so as to improve accuracy , high resolution, and the effect of reducing the number of side lobes

Active Publication Date: 2016-11-16
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

In the process of locating the sound source, the conventional beamforming algorithm does not consider the influence of the airflow environment on the array manifold

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  • Method for positioning sound source in airflow environment
  • Method for positioning sound source in airflow environment
  • Method for positioning sound source in airflow environment

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[0040] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0041] The present invention provides a sound source positioning method in an airflow environment, and the process is as follows:

[0042] First, determine the microphone that can meet the sound pressure level and frequency response range according to the object to be measured and its flow rate environment; then build an Archimedes spiral microphone array, and connect the NI-PXIe multi-channel data through a BNC cable Acquisition equipment, through the labview software to achieve multi-channel acoustic signal data acquisition and storage.

[0043] Secondly, perform subsequent processing on the data signal, import the environmental parameters and the collected acoustic signal data into matlab software for programming calculations, solve the a...

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Abstract

The invention provides a method for positioning a sound source in the airflow environment, belonging to the technical field of sound source localization. The method comprises the following steps of: setting up a microphone array, and collecting acoustic signals in the airflow environment; according to coordinates and other geometric parameters of array microphones, solving an acoustic propagation path from each microphone to a scanning point by means of an Amiet model, so as to obtain an array manifold matrix A in the airflow environment; estimating the number of sound sources, constructing a cross-spectrum matrix after noise reduction, and establishing a value function among a scanning point sound pressure matrix, the array manifold matrix and the cross-spectrum matrix after noise reduction; solving an acoustic pressure matrix by convex optimization iteration, finally drawing out a sound pressure reconstruction picture, and obtaining the sound source position information. The invention helps accurately locate the position of the sound source in the airflow environment and correct the positioning deviation which may be caused by airflow, achieves high positioning resolution, realizes multi-coherent sound source localization, reduces the calculation quantity in the convex optimization iteration process, reduces the number of side lobes in the reconstruction cloud picture, and achieves good sound source localization effect.

Description

technical field [0001] The invention relates to the technical field of sound source localization, in particular to a sound source localization method in an airflow environment. Background technique [0002] In recent years, with the rapid development of air transportation such as civil and military aircraft, a series of problems caused by aviation aerodynamic noise have gradually attracted people's attention. Fuselage noise has become a factor that seriously restricts aircraft design. Fuselage noise mainly comes from lifting devices, landing gear, wheel wells and trailing edges of wings, etc., which seriously threatens human health and affects the daily life of nearby residents. At the same time, under the excitation of high-intensity thermal noise of high-speed aircraft, rapid alternating stress will be generated inside the aircraft component materials, and thermal noise fatigue damage will occur in local structures, which seriously affects the service performance of the a...

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Application Information

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IPC IPC(8): G01S5/22G01M9/06
CPCG01M9/06G01S5/22
Inventor 黎敏李远文魏龙秦胜
Owner UNIV OF SCI & TECH BEIJING
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