Stability analysis and design of on-board rail-wheel solid stick friction management systems

控制轮轨界面摩擦力是延长轮轨使用寿命、提高燃油经济性、降低噪声和降低曲线轨道横向力的必要措施。LB Foster的摩擦力管理系统被全球铁路网络所使用。一种形式的摩擦管理系统采用固体棒状润滑剂，其直接施加到运输车辆的轮缘。轮杆接触区域中的接触力有时会导致摩擦管理结构组件内的振动开始，严重损害摩擦控制技术所期望的性能。固体杆系统中的摩擦引起的振动是非常复杂的，并且迄今为止，不可预测的现象，其可导致硬件故障、杆故障、来自杆颤振的过度噪声以及固体杆系统的不良性能。现有的经验方法，用于工业，以对付这种振动问题是昂贵的和不可靠的。需要大量的资本投资来为列车队配备固体棒技术，并且如果发现过度振动，则需要大量的资源来改善该问题。拟议的合作研究将导致一个基本的理解背后的主要设计因素摩擦引起的振动固体棒系统的系统建模的振动现象，使用严格的建模和实验方法。 这种科学驱动的方法将有助于开发评估工具，以预测这些不稳定振动的发生，并促进设计变更，以最大限度地减少其影响。通过有效的摩擦管理提高燃油经济性来减少排放，是这项工程科学驱动的研究所带来的环境效益。

Controlling friction at rail-wheel interface is indispensable to extend the rail-wheel life, improve fuel efficiency, reduce noise and lateral forces in curved railway track sections. LB Foster's friction management systems are being used by railway networks worldwide. One form of friction management system employs a solid stick lubricant, which is directly applied to the wheel flange of a transit vehicle. The forces of contact in the wheel stick contact region can sometimes lead to the onset of vibrations within the friction management structural assembly, severely compromising the performance expected from the friction control technology. Friction induced vibrations in solid stick systems is a very complex, and to date, unpredictable phenomenon that can lead to hardware failures, stick failures, excessive noise from stick chatter and poor performance of the solid stick system. Existing empirical approaches, used by industry, to counter this vibration problem have been costly and unreliable. Significant capital investment is required to outfit a fleet of trains with solid stick technology and if excessive vibrations are found, significant resources are required to ameliorate the problem. The proposed collaborative research will lead to a fundamental understanding of the principal design factors behind friction-induced vibrations in solid stick systems by systematically modelling the vibration phenomena using rigorous modelling and experimental methods. This science driven approach will help develop evaluation tools to predict the occurrence of these unstable vibrations and foster design changes to minimize their impact. Reduction in emissions through increased fuel economy, resulting from effective friction management, is a concomitant environmental benefit of this engineering science driven research.