基于平滑伪维格纳分布与阶次跟踪的汽车变速器啸叫噪声分析

Analysis of Vehicle Gearbox Whine Noise based on Smoothed Pseudo Wigner-Ville Distribution and Order Tracking

运用平滑伪维格纳分布,结合阶次跟踪方法,进行汽车变速器啸叫噪声分析。首先,针对计算机运算的实现,提出平滑伪维格纳分布算法;然后基于瞬时频率估计,运用平滑伪维格纳分布,进行发动机转速信号的提取;结合分段三次埃尔米特插值多项式,在角域内进行信号的等角间隔重采样;运用平滑伪维格纳分布,进行变速器二挡噪声的时频分析与阶次跟踪分析,对啸叫噪声进行定性、定量分析。为变速器啸叫分析提出了新的方法。

The smoothed pseudo Wigner--Ville distribution （SPWVD） and order tracking are applied in the analysis of gearbox whine noise. Firstly, the SPWVD algorithm is put forward for computer programming. Then, by using instantaneous frequency estimation method, the speed signal is e- tracted with SPWVD. Combined with Hermite interpolation polynomial, the equal angle interval resa- mple of the noise signal is carried out in angular domain for order tracking. Finally, the time--frequen- cy analysis and order tracking analysis of the 2nd shift noise are carried out by using SPWVD, while the qualitative analysis and quantitative analysis are used to research the feature of whine noise. It＇s a new method for the study of automobile gearbox whine noise.