摆式列车未平衡加速度信号的数字滤波

On Digital Filtering for Unbalanced Acceleration Signals of Tilting Train

在利用未平衡加速度信号获取摆式列车的控制信号时 ,由于存在车体横向振动等许多干扰 ,需要进行低通滤波 ,本文针对信号的特点设计了切比雪夫和巴特沃思滤波器 ,并对滤波结果进行了分析和比较 。

When tilting train travels at curved rails, its tilting angle should be revised according to its actual condition of the railway so as to improve its comfort index. Usually we get tilting control signal of tilltng train by making use of unbalanced acceleration signals. Because the existing of many interferences such as transverse vibration etc, low pass filtering is needed. This paper designs Chebyshev filter and Butterworth filter to solve the problem of serious signal interference, the coupling of vibration signal, too low signal frequency and too high sampling frequency. We also analyzes and compares the effect of filtering. The filtering effects of the two kinds of filter on unbalanced acceleration are not much different. It is easier to design a Butterworth filter, but two filters have the same calculating speed. When the filter order n equals 3, we can get both higher speed and higher precision.