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 extracted with SPWVD.Combined with Hermite interpolation polynomial

the equal angle interval resample of the noise signal is carried out in angular domain for order tracking.Finally

the timefrequency 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.