ABSTRACT

The vibration environments of railway vehicles can be considered as the source of the vibrations in respective parts of that. With a certain vibration environment above the limit, structural cracks or component drops occur because of the vibration of axle box and bogie frame. Considering the multi-channel and non-normal characteristics of the measured environment of rail vehicles, a statistical induction method is combined with Johnson system, and a universal technique of vibration environment spectral induction is proposed. By the measured acceleration data from a test vehicle with the problem of the component (transponder) drops from bogie frame, the induced spectrum is calculated, and its comparison with the functional test spectrum from the international standard IEC 61373 reveals that the vibration environment of bogie frame exceeds the limit. Based on the induced spectrum, the hierarchical transmissibility of the primary and secondary suspensions of the test vehicle is derived. It is found that the over-limit vibration environment of bogie frame derives from the high hierarchical transmissibility of the primary suspension. The results show that the proposed technique of spectral induction and hierarchical transmissibility can accurately reflect the measured vibration environment and the layer-by-layer transmission of rail vehicles.

摘要

轨道车辆的振动环境可以认为是其各个部分的振动源。在超过一定限度的振动环境下，由于轴箱和转向架的振动而产生结构裂纹或部件脱落。针对轨道车辆被测环境的多通道和非正态特性，将统计归纳法与约翰逊系统相结合，提出了一种通用的振动环境谱归纳技术。通过对存在部件（应答器）从转向架框架掉落问题的测试车辆测得的加速度数据，计算感应谱，并将其与国际标准IEC 61373的功能测试谱进行比较，揭示转向架的振动环境帧超过限制。基于诱导谱，推导出试验车辆主副悬架的分级传递率。研究发现转向架超限振动环境源于主悬架的高层次传递性。结果表明，所提出的光谱感应和分层传递率技术能够准确反映实测振动环境和轨道车辆的逐层传递情况。