| AEROSPACE AND ENGINEERING MECHANICS |
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Optimization of acoustic sensor arrays for wind tunnel measurements |
| JI Jianchao1,2, ZHANG Yu2, WANG Mingxin2 |
1. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;
2. Army Aviation Institute, Beijing 101123, China |
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Abstract Acoustic sensor arrays used in wind tunnels for acoustic measurements are affected by channel and background noise which can be greater than the signal sources. The noise is mainly related to the wind tunnel parameters, interactions between the wind and the wall, and the acoustic sensor. This study combines channel signal filtering with processing of the cross spectral matrix (CSM) diagonal elements to recover the signal of interest from the channel noise with an extended Kalman filter to track the phase difference of the background noise to optimize the coherent background noise. Simulations show that this method effectively reduces the number of side lobes, suppresses the side lobe level, reduces the influence of noise on the beamforming results, and greatly improves the imaging by the acoustic sensor array.
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| Keywords
sensor array
beamforming
acoustic noise measurement
signal processing
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Issue Date: 15 January 2018
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2018,
Vol. 58
