Study on Multiple Coherence Decomposition Method for Road Noise of a Car

YANG Yang1, CHU Zhi-gang2

Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (19) : 31-36.

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (19) : 31-36.

Study on Multiple Coherence Decomposition Method for Road Noise of a Car

  • YANG Yang1, CHU Zhi-gang2
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Abstract

It is of great significance for the interior acoustical design of a car to obtain noise contributions at the driver’s ears of each road noise source by a reasonable and effective decomposition method. In this paper, multiple coherence method was utilized for road noise of a car, whose procedure was given out. Meanwhile, in order to reduce ill-condition error, some small eigenvalues of the cross-spectral matrix of input signals were restricted by a setting threshold. On that basis, a road noise decomposition experiment was carried out for a car. Results show that on one hand, the left front wheel, the left rear wheel, the right front wheel and the right rear wheel are four independent road noise sources, on the other hand, the mean difference between the noise synthesized from the decomposed contributions and the measured one is only 0.4dB (A) in 20~6400Hz at the driver’s right ear. The correct decomposition results provide data sources for the acoustical design of new cars. The multiple coherence method is simple, easy-to-use, effective and reliable, which provides a powerful tool for the decomposition of road noise.

Key words

road noise / decomposition / multiple coherence method / experiment

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YANG Yang1, CHU Zhi-gang2. Study on Multiple Coherence Decomposition Method for Road Noise of a Car[J]. Journal of Vibration and Shock, 2015, 34(19): 31-36

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