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Method for optimally designing microphone array by taking acoustic propagation correlation loss into consideration

A microphone array and optimization design technology, applied in genetic rules, design optimization/simulation, calculation, etc., can solve the problems of array performance degradation, failure to meet array performance requirements, failure to consider sound propagation correlation, etc., to improve Effects on Array Performance

Active Publication Date: 2017-05-24
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

The existing array optimization design method fails to consider the loss of sound propagation correlation in the design process. When the given microphone array design is applied to the flight test of civil aircraft aerodynamic noise, the performance of the array decreases sharply and cannot meet the requirements of civil aircraft aerodynamic noise. Requirements for Array Performance in Noise Flight Test

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  • Method for optimally designing microphone array by taking acoustic propagation correlation loss into consideration
  • Method for optimally designing microphone array by taking acoustic propagation correlation loss into consideration
  • Method for optimally designing microphone array by taking acoustic propagation correlation loss into consideration

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Embodiment Construction

[0025] The invention aims at the measurement of the aerodynamic noise of the flight test of the civil aircraft, and establishes a sound propagation correlation loss model. Under the influence of the loss of sound propagation correlation problem, the acoustic signals received by the microphones in a smaller aperture range in the array are correlated, while the microphone signals outside this range are irrelevant, so the effective aperture of the array is introduced :

[0026]

[0027] where: R f is the effective array aperture; h is the distance between the sound source and the array, that is, the flight height of the aircraft; f is the analysis frequency. That is, when the flying height is 50m, the effective aperture of the array at 4000Hz frequency is 1m. Introduce weight coefficients for each microphone, and embed the array performance evaluation process:

[0028]

[0029] Among them: wi, f is the weight coefficient of the i-th microphone at the analysis frequency ...

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Abstract

The invention provides a method for optimally designing a microphone array by taking acoustic propagation correlation loss into consideration. According to the method, a correlation loss model is established for the problem of correlation loss occurring when an acoustic wave is propagated at a long distance in a civil aircraft flight test, and evaluation for the array side-lobe suppression level and resolution performance parameter is carried out based on the model; and optimizing coordinates of an array unit by taking the array side-lobe suppression level and resolution performance parameter under influence of correlation loss problem as objective functions and utilizing a quick non-dominated sorting genetic algorithm. The method overcomes the defect in an existing method, can be used for providing the array unit arrangement with comprehensively optimized side-lobe suppression level and resolution and still has excellent performance under the influence of correlation loss problem, and is adaptive to the optimal design of an array for developing pneumatic noise measurement of a microphone phase array for flight tests.

Description

technical field [0001] The invention relates to a method for optimizing the design of a microphone array, in particular to a method for optimizing the design of a microphone array applied to the measurement of aerodynamic noise in flight tests of civil airliners. Background technique [0002] Using microphone phase array measurement technology to carry out aerodynamic noise measurement in civil aircraft flight tests can obtain the most abundant, most authentic and most valuable civil aircraft aerodynamic noise data, which is an important part of civil aircraft aerodynamic noise research and has been well received in China More and more attention. In the flight test of civil aircraft, the atmospheric environment is complex, and the sound wave is emitted from the aircraft, and after long-distance propagation, the correlation between the sound wave signals received by the microphones at different positions in the array is weakened. This is the problem of loss-of-correlation in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
CPCG06F30/20G06N3/126
Inventor 周家检张青青郝璇
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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