车辆—轨道系统高中低频动力学模型的理论特征及其应用范围的研究

针对铁路在提速和高速发展中碰到的车辆—轨道系统的结构磨损加剧、关键部件疲劳破坏和噪声等问题,提出必须进行车辆—轨道系统高中低频范围的动力学模型研究。根据激扰的差异及其波长范围,针对车辆—轨道系统动力学在低频、中频和高频3个范围内存在问题的性质,建立符合研究要求的车辆模型、轨道模型和轮轨接触模型,并采用合理的数学方法求解。认为以车辆—轨道系统的频率特征为基础,进行完整的车辆—轨道系统动力学研究,可以有效研究车辆—轨道系统的短时动力学和长期行为之间的关系。

Theory and Application Study on Vehicle/Track System Dynamic Models in High,Middle and Low Frequencies

Focused on problems such as worsening of vehicle/track system wear, noise and the failure of key components due to fatigue, which are encountered during the development of high-speed trains and train speed increase, dynamic model of vehicle-track system in high, medium and low frequency range should be studied. According to the difference of excited disturbances and their wavelength range, the characteristics of problems concerning vehicle/track system dynamics at low frequency, medium frequency and high frequency, car model, track model and wheel-track contact model are developed. Solutions are found with suitable mathematical method. It is of great significance for realization of high-speed railway to conduct comprehensive research on vehicle/track system dynamics based on frequency characteristics of vehicle-dynamics. Such a research can effectively help research on the relationship between long-term behavior and short-time dynamics of vehicle/track system.