Parameter quantification for evaluation of vehicle's impulsive BSR noise

Abstract

In vehicles, consumer complains against BSR (buzz, squeak, rattle) noises are increasing. The BSR noises includes continuous or impulsive sounds depending on the generation mechanism. The evaluation method for rating the annoyance of BSR noises is required after taking these irregularly and periodicity. For continuous sounds, conventional Fourier transfer provides sufficient information on the spectral characteristics. However, the spectral information for impact sounds is difficult to be identified from Fourier transforms. In this study, Prony's method is applied to evaluate the spectral components (frequencies and decay ratio) of impact noises. The sinusoidal and exponential models fits a sum of damped complex exponentials. Through the auditory test, the noise level and attenuation ratio were identified as important factors influence annoyance. This attenuation term increased the annoyance of BSR sounds.