基于小波的轨道不平顺和车体振动响应分析

Analysis of track irregularity and car-body vibration response based on wavelet transform

通过选择合适的小波基函数,对轨道不平顺和车体振动加速度信号进行连续小波变换,以小波系数作为平顺状态评价指标进行轨道不平顺时频分析;同时,将小波尺度系数与车体振动加速度时程曲线进行相关性分析,可以提取对车体振动影响较大的特征频率(段)。研究结果表明:以上方法直观有效,可以很好地提取及定位轨道不平顺时频特征,并对车体振动加速度响应进行分析。

By selecting transformed through con appropriate wavelet functions, the track irregularity and car -body vibration signal were tinues wavelet method, and then the time - frequency feature of the track irregularity was analyzed by setting the wavelet coefficients as the evaluation index of the track smooth state. At the same time, for extracting the characteristic frequency （band） which can seriously affect the car - body vibration, correlation analysis between wavelet scale coefficients and car - body vibration acceleration time - history carve was studied. The results show that the above methods are visually effective, which can be better used to extract the time - fre- quency characteristics, confirm the location, and analyze the car - body vibration acceleration dynamic response.