基于小波变换的轨道不平顺信号分析

Track Irregularity Analysis Based on Wavelet Transform

为消除轨检车速度不稳定对采集的轨道不平顺信号频谱分析的影响,利用Haar小波变换建立了原始信号瞬时频率与Haar小波系数的关系,以计算瞬时频率.根据求取的瞬时频率对采样信号进行内插和重采样,再对重采样信号进行傅立叶变换,即可得到消除了畸变的频谱.

To eliminate the disturbances from the speed-instability of the measurement vehicle on the collected track irregularity spectrum, Haar wavelet transform was used to analyze the instantaneous frequencies of the track irregularity signals. The relationship between the instantaneous frequencies of the track irregularity signals and the Haar wavelet coefficients was established to calculate the instantaneous frequencies. The calculated instantaneous frequencies are used for interpolation to get the re-sampled signals, which are then Fourier-transformed to get disturbance-free frequency spectrum.