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

控制轨轮界面摩擦是延长轨轮寿命、提高燃油效率、降低噪声和降低弯道侧力的必要条件。LB Foster的摩擦管理系统被世界各地的铁路网络所使用。一种形式的摩擦管理系统采用固体棒润滑剂，直接应用于运输车辆的车轮法兰。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。摩擦引起的振动是一种非常复杂且不可预测的现象，可能导致硬件故障、粘杆故障、粘杆颤振产生的过多噪声以及固体粘杆系统的性能下降。现有的工业经验方法，用来解决这个振动问题是昂贵的和不可靠的。为列车配备实心棒技术需要大量的资本投资，如果发现过度振动，需要大量的资源来改善这个问题。该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，从而对固体棒系统中摩擦引起的振动背后的主要设计因素有一个基本的理解。这种科学驱动的方法将有助于开发评估工具来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。由于有效的摩擦管理，通过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.