A new method to derive rail roughness from axle-box vibration accounting for track stiffness variations and wheel-to-wheel coupling
A new method to derive rail roughness from axle-box vibration accounting for track stiffness variations and wheel-to-wheel coupling
复制标题
DOI：
10.1016/j.ymssp.2023.110232
复制
发表时间：
2023-06
影响因子：
8.4
通讯作者：
Tobias D. Carrigan;J. Talbot
中科院分区：
文献类型：
--
作者：
Tobias D. Carrigan;J. Talbot
铁路需要经常检查，以保持可接受的轨道粗糙度水平。安装在运行中的铁路车辆上的加速度计通过使用频域中的传递函数从轴箱振动的测量值导出轨道粗糙度谱，潜在地提供了一种具有成本效益的近连续粗糙度监测方法。本文讨论了目前限制这种方法的有效性的两种现象：轨道支撑刚度沿着轨道的变化，这是车辆轨道系统的最不为人知的属性，导致可变的传递函数;和车轮之间的振动耦合，这限制了基于单个车轮的传递函数的有效性。提出了一种新的方法，估计轨道刚度曲线拟合传递函数的峰值在轴箱加速度谱与所谓的'P2'共振的轮轨系统。通过细化传递函数来解决轮对耦合问题，以考虑在同一轨道上运行的多个车轮。轴箱加速度也受到车轮粗糙度的影响，并简要说明了梳状滤波器的使用，以减轻这种影响。在伦敦地铁维多利亚线上进行的数值模拟和测量试验的发展进行了评估。
Railways require frequent inspection to maintain acceptable levels of rail roughness. Accelerometers mounted on in-service railway vehicles potentially offer a cost-effective method of near-continuous roughness monitoring by using a transfer function in the frequency domain to derive rail roughness spectra from measurements of axle-box vibration. This paper addresses two phenomena that currently limit the effectiveness of such a method: the variation in track support stiffness along the track, which is the least known property of the vehicle-track system, resulting in a variable transfer function; and the vibration coupling between wheels, which limits the effectiveness of a transfer function based on a single wheel. A new method is presented that estimates the track stiffness by curve-fitting a transfer function to the peak in the axle-box acceleration spectrum associated with the so-called ‘P2’ resonance of the wheel-rail system. Wheel-to-wheel coupling is addressed by refining the transfer function to account for multiple wheels running on the same rail. Axle-box acceleration is also affected by wheel roughness, and the use of a comb filter is briefly demonstrated to mitigate this effect. The developments are evaluated by both numerical simulation and measurement trials conducted on London Underground’s Victoria line.