Vibration transmission analyze based on wavelet theory and higher order spectrum

The vibration of internal structure and car body of rolling stock influences the safety of train operation directly. Due to non-stationary feature of vibration signal, traditional spectrum analysis and PSD methods are limited. In this paper, mechanical vibration transmission relationship is researched based on wavelet denoising technique and higher order spectrum analysis by the use of the character that wavelet decomposition possess the function of self-adapting time-frequency localization characteristic and higher order spectrum can restrain the additive gauss noise, putting forward frequency response function based on 1.5 dimension spectrum. The effect of vibration transmission relationship based on wavelet de-noising and 1.5 dimension spectrum is better than power spectrum though analyzing and comparing, the results could be taken into consideration in vehicle structural design.