基于城轨电客车轴箱振动加速度的轨道短波不平顺识别方法

Short-wave track irregularity identification method based on vibration acceleration of axle box of urban rail EMU

为提高波磨指数法在通过城轨电客车轴箱振动加速度识别钢轨波磨特征方面的适用性,文章将既有波磨指数计算过程中由典型频率控制的带通滤波算法转换为典型波长控制的带通滤波算法,获得改进的波磨指数计算方法。该方法能够反映波磨发生区段的钢轨粗糙状态,并且可以有效抑制钢轨接头等引起的瞬时冲击对检测结果的影响;结合时频分析技术,可有效提取典型波磨区段的特征波长,且与现场实测结果吻合较好。

To improve the applicability of the corrugation index method in identifying rail corrugation characteristics through the vibration and acceleration of the axle box in urban rail EMUs, the existing band-pass filtering algorithm controlled by typical frequency is transformed into a bandpass filtering algorithm controlled by typical wavelength in this paper, hence an improved calculation method of rail corrugation index is obtained. This method could estimate the rail surface roughness state in the section where the corrugation occurs, and could effectively restrain the influence of the transient impact caused by rail joints on the detection results. Combined with time-frequency analysis technology, the characteristic wavelength of the corrugation occurrence section could be effectively extracted, which is in good agreement with the in-situ measurement results.