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

控制轮轨接触面的摩擦力是延长轮轨使用寿命、提高燃油效率、降低噪声和降低轨道弯曲区段横向力的关键。Lb Foster的摩擦管理系统正被世界各地的铁路网使用。一种形式的摩擦管理系统采用固体棒状润滑剂，直接应用于公共交通车辆的轮缘。轮杆接触区域的接触力有时会导致摩擦管理结构组件内的振动，严重影响摩擦控制技术的预期性能。固体棒系统中的摩擦诱发振动是一种非常复杂且迄今不可预测的现象，可能会导致硬件故障、棒故障、棒抖动产生的过大噪声和固体棒系统的性能差。工业界用现有的经验性方法来应对这种振动问题，这些方法成本高昂且不可靠。需要大量的资本投资来为一支列车配备坚固的棒状技术，如果发现振动过大，就需要大量的资源来改善问题。拟议的合作研究将通过使用严格的建模和实验方法对振动现象进行系统建模，从而从根本上理解固体棒系统中摩擦诱发振动背后的主要设计因素。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，并促进设计更改，以将其影响降至最低。通过有效的摩擦管理提高燃油经济性来减少排放，这是这项工程科学驱动的研究的一个伴随而来的环境效益。

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.