小波变换在摆式列车控制信号分析中的应用

Application of Wavelet Transform in Analysing Tilt’s Train Contral System

列车横向加速度具有较低频率特性，是受到列车运行速度影响而变化的非平稳信号。根据小波的多分辨率分析原理，应用Ｄａｕｂｅｃｈｉｅｓ正交小波对列车进入弯道横向加速度信号进行多分辨率分析，消去列车横向振动信号，提取出列车通过弯道时的剩余离心加速度信号，以便及时推确地为摆式列车提供倾摆控制指令。

Since a train s transverse acceleration signal is not only characterized by the low frequency but also affected by the train speed, they are nonstationary signals. It is therefor difficult to get the centrifugal acceleration signals by the conventional filter merthod, The article tries to demonstrate that in accordance with the theory of the multiresolution analysis, the remain centrifugal acceleration signals are to be obtained by eliminating the transverse vibration signals, if the Daubechines orthogonal wavelet is used to analyse the transverse acceleration signals, when a train goes round curves. As a result, the precise and immediate tilt train command signals can be provided.