高铁运用安全的三大技术局限性

Three Technical Limits of High-Speed Railway Practice Safety

从当前高铁运用问题来看,高速转向架存在三大非线性,即拖车构架点头迟滞非线性、抗蛇行动态刚度非线性和非线性稳定性.在充分认识上述三大非线性的基础上,应用抗蛇行频带吸能新理论,提出了最佳安全稳定裕度调控技术对策,以进一步协调高铁运用安全性与经济性之间的矛盾.在"重返"350 km/h高铁运营的技术准备中,应当对如下三大技术局限性给予充分重视,即商业运营速度、振动疲劳和曲线横风,特别是曲线横风应当作为一项当前十分急迫的计算流体动力学CFD科研任务.

From the viewpoint of the present problems in HSR practices, there exist three important nonlineari-ties in high-speed bogies, i. e. lag nonlinearity of trailer bogie frame pitching, anti-hunting dynamical stiffness nonlinearity and nonlinearity stability. Applied with the novel theory of anti-hunting absorption-band, the opti- mal strategy of safety stability margin regulation was proposed in the foundation of the above three nonlinearity findings in order to coordinate further the contradiction between safety and economics. The three following im-portant technical limits should be paid great attention in the technical preparation of returning 350 km/h HSR practices：commercial running velocity, vibration fatigue and the curve negotiation with crosswind, especially the curve negotiation with crosswind should be served as a very urgent researching mission of Computation Fluid Dynamics （CFD） at oresent.