Multiple coherence decomposition method for road noise of a car

作者：Yang Yang; Chu Zhi Gang^*

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

DOI：10.13465/j.cnki.jvs.2015.19.005

• Acoustical design
• Basic procedure
• Cross spectral matrixes
• Decomposition methods
• Eigenvalues
• Front wheels
• Ill-conditions
• Road noise

It is of great significance for interior acoustical design of a car for us to obtain each road noise source contribution to a driver's ear noise with a reasonable and effective decomposition method. Here, the multiple coherence decomposition method was utilized for road noise of a car, its basic procedure was given. Meanwhile, in order to reduce ill-condition error, some small eigenvalues of the cross-spectral matrix of input signals were restricted with a set threshold. Furthermore, a road noise decomposition test was conducted for a car. Results showed that the left front wheel, the left rear wheel, the right front wheel and the right rear wheel are four independent road noise sources;the mean difference between the noise near the right ear of the driver synthetized with the decomposed contributions and the measured one is only 0.4 dB (A) within a range of 20~6400 Hz;the correct decomposition provides data for the acoustical design of new cars;the multiple coherence decomposition method is simple, easy-to-use, effective and reliable, it provides a powerful tool for the decomposition of a car's road noise.

• 出版日期2015