Research on road and railway vehicle systems

公路、铁路车辆系统研究

• 批准号: 6153-2006
• 负责人: Ahmed, Waizuddin
• 金额: $ 1.38万
• 依托单位: Concordia University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=365446
• 关键词: Research; road; railway; vehicle; systems

The proposed research focuses on fundamental and application through analytical and experimental research on road and railway vehicle systems. Some of the ongoing, recently initiated and proposed topics with potentials for practical application include:  Suspension systems and isolators using advance passive and semi-active concepts (including MR and ER dampers) to enhance the performance in terms of ride, handling and dynamic wheel loads, and conflict between ride and handling. Appropriate controller needs to be established for such dampers in specific applications;  Handling: The current practice in the design of steering system uses a fixed ratio for the angles of inner and outer wheels and is based on low speed maneuvers. The applicant proposes research to develop speed dependent adaptive steering system that will significantly improve the handling performance as well as will significantly enhance the noise reduction and life of pneumatic tires; Stability: A normalized measure of roll instability which is not a function of vehicle or operational parameter are being established through extensive simulation studies. The proposed research will investigate application potentials of the measures and develop open and closed loop control strategies for early warning and stability enhancement devices for long freight vehicles where the instability initiated at the rear end often remains undetected until too late; Sensors: Applicant proposes to continue his effort in dynamic studies of  MEMS towards development of sensors for road and railway vehicle systems; Wheel-rail contact and dynamic forces resulting from wheel-rail defects as well as flats and corrugation have been a major concern for railway industry both for main- tenance and safety. The research proposes fundamental re-examination of wheel-rail contact models capable of predicting Wheel- rail dynamics. The proposed research will develop a radial spring based wheel model with improved rail model to compare with Hertizan model and experimental data. The developed vehicle-track model will be uti- lized towards response identification for a given defect and the development of smart wheelset to enhance early detection and in-time maintenance of railway wheelsets.

本课题的研究重点是公路和铁路车辆系统的基础研究和应用研究。一些正在进行的、最近发起的和提出的具有实际应用潜力的主题包括：采用先进的被动和半主动概念（包括MR和ER阻尼器）的悬架系统和隔离器，以提高行驶、操纵和动态车轮负载方面的性能，以及行驶和操纵之间的冲突。在特定应用中，需要为这种阻尼器建立适当的控制器；操纵：目前设计转向系统的做法是采用固定比例的内、外车轮的角度，并基于低速机动。申请人建议研究开发速度依赖自适应转向系统，该系统将显著改善操纵性能，并将显著提高气动轮胎的降噪和寿命；稳定性：通过广泛的模拟研究，建立了一种与车辆或操作参数无关的侧倾不稳定性的标准化测量方法。该研究将探讨这些措施的应用潜力，并开发开闭环控制策略，用于长距离货运车辆的早期预警和稳定性增强装置，这些车辆的后端不稳定往往被发现得太晚；传感器：申请人建议继续致力于MEMS的动态研究，以开发用于道路和铁路车辆系统的传感器；轮轨接触和由轮轨缺陷、扁平和波纹引起的动力一直是铁路工业维护和安全的主要问题。该研究提出了对能够预测轮轨动力学的轮轨接触模型进行根本性的重新审视。本研究将建立基于径向弹簧的车轮模型和改进的轨道模型，并与Hertizan模型和实验数据进行比较。所建立的车轨模型将用于对给定缺陷的响应识别和智能轮对的开发，以提高铁路轮对的早期发现和及时维护。