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Microphone array optimum design method for closed wind channel aerodynamic noise measurement

A microphone array, aerodynamic noise technology, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., to achieve the effect of reducing the impact

Active Publication Date: 2015-06-17
CHINA ACAD OF AEROSPACE AERODYNAMICS
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Problems solved by technology

[0005] The technical solution problem of the present invention is: to overcome the deficiency of existing method, provide a kind of microphone array optimization design method that is applied to closed wind tunnel aerodynamic noise measurement, this method is aimed at the demand of closed wind tunnel aerodynamic noise measurement to microphone array, in Under the condition of satisfying the installation conditions of the array in the closed wind tunnel, taking the requirement of the array sidelobe suppression level as the constraint condition, taking the array resolution as the objective function, using the simulated annealing method to optimize the coordinates of the array elements to obtain the resolution and sidelobe suppression Arrangement of array units that meet the requirements on both levels

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  • Microphone array optimum design method for closed wind channel aerodynamic noise measurement

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Embodiment Construction

[0025] Modeling an array optimization problem:

[0026] min(R(x i )), (x i ∈Ω, MSL(x i )≤SNR,|x i -x g |≥d)

[0027] in:

[0028] R(x i ) is the resolution performance function, which is the objective function;

[0029] x i (i=1, M) is the coordinate of the array unit, and M is the number of the array unit;

[0030] x i ∈Ω is the constraint condition, Ω is the area determined by the installation space of the array in the wind tunnel, and the array

[0031] The unit coordinates must not exceed the area Ω;

[0032] |x i -x g |≥d is the constraint condition, g=1, M and g≠i, the minimum distance between two adjacent units

[0033] Not less than the specified value d;

[0034] MSL(x i )≤SNR is the constraint condition, MSL(x i ) is the array sidelobe suppression level function,

[0035] Better than the specified value SNR.

[0036] Such as figure 1 As shown, the present invention is applied to the flow chart of the microphone array optimization design method for...

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Abstract

Provided is a microphone array optimum design method for closed wind channel aerodynamic noise measurement. According to the method, aiming at the demand for a microphone array of closed wind channel aerodynamic noise measurement, under the condition that array installation conditions of a closed wind channel are met, with requirements of array sidelobe suppression levels as constraint conditions and with the array resolution ratio as an objective function, array unit coordinates are optimized in a simulated annealing method. The microphone array optimum design method overcomes defects in existing methods, and array unit arrangement adaptive to closed wind channel installation can be achieved, wherein the sidelobe suppression levels and the resolution ratio of the array unit arrangement can meet demands.

Description

technical field [0001] The invention relates to a microphone array optimization design method, in particular to a microphone array optimization design method applied to the measurement of aerodynamic noise in a closed wind tunnel. Background technique [0002] The research on the aerodynamic noise of civil aircraft in the closed wind tunnel using the microphone phase array measurement technology has attracted more and more attention in China, and different test models require different array designs. Arrays have two main performance metrics: resolution and level of sidelobe suppression. The resolution is related to the array aperture, the larger the aperture, the better the resolution. The level of sidelobe suppression is related to the density of array elements, the denser the array is, the better the level of sidelobe suppression is. Therefore, for an array with a given number of microphones, there is a certain contradiction between the resolution and the level of sidelo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
Inventor 周家检郝璇陈大斌张卫民
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
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