铁道车辆侧风倾覆安全性研究

通过理论分析,提出了基于风速、风向角、线路服役条件,车速、车辆参数的车辆侧风倾覆安全性计算方法,为车辆侧风倾覆安全性的计算提供参考。     

高速行驶遭遇侧风的SUV汽车气动特性模拟研究

采用计算流体力学和合成风方法研究某SUV汽车高速行驶遭遇比较危险强度侧风下的外流场分布并得到气动力（矩）及系数。该方法使乘用车高速行驶遭遇危险侧风情况下气动特性预测成为可能。为深入研究高速行驶侧风作用下乘用车气动特性以及结合汽车操纵动力学对侧风稳定性进行动力学仿真提供了有利的参考。     

磁悬浮列车横风稳定性的数值分析

利用二维定常不可压缩Navier-Stokes方程、K-E两方程紊流模型,采用有限体积法分析计算了不同车轨结构的磁浮列车横风稳定性,并与轮轨型列车的横风稳定性作了比较。数值分析结果表明,在横向风的作用下,轮轨型列车的横向稳定性优于磁浮列车,而吸力型磁浮列车的横向稳定性又优于U型线路斥力型磁浮列车。     

横风对高速动车曲线通过性能的影响

通过横风对电动车组气动特性影响的试验研究，得到了高速动车受横风作用时所受的气动升力、侧力和侧翻力矩，并利用动力学分析软件SIMPACK分析高速动车在横风工况下的曲线通过性能．分析结果表明，侧向风力引起的车轮减载是影响动车安全运行的重要因素．在所研究的工况下，动车在常值侧风下通过曲线的速度不应超过220km／h，在阵风下以100km／h的速度通过曲线仍然不能满足安全指标．     

铁道车辆临界倾覆风速静态解析式的验证

根据车辆外力的静平衡,分析了外力和轮重减载率的关系,推出了铁道车辆临界倾覆风速静态详细解析式.利用实车等效试验验证了详细解析式的正确性.     

Improving crosswind stability of fast rail vehicles using active secondary suspension

Rail vehicles are today increasingly equipped with active suspension systems for ride comfort purposes. In this paper, it is studied whether these often powerful systems also can be used to improve crosswind stability. A fast rail vehicle equipped with active secondary suspension for ride comfort purposes is exposed to crosswind loads during curve negotiation. For high crosswind loads, the active secondary suspension is used to reduce the impact of crosswind on the vehicle. The control input is taken from the primary vertical suspension deflection. Three different control cases are studied and compared with the only comfort-oriented active secondary suspension and a passive secondary suspension. The application of active secondary suspension resulted in significantly improved crosswind stability.     

Considerations on active control of crosswind stability of railway vehicles

The DLR research project Next Generation Train deals with concepts, methods and technologies for a very high-speed train in double-deck configuration and light-weight design. Due to these three key features, crosswind stability is a particular subject of study. It is shown that conventional approaches here fall short of guaranteeing safety in high-wind occurrences according to the given homologation standards. Therefore, this paper discusses the feasibility of different approaches to ensure crosswind stability by means of active control. Four different concepts are overviewed, the most promising one is then chosen und examined in detailed multibody simulations that are based on data from wind tunnel measurements of the Next Generation Train.     

基于滑模理论的高速车辆侧风稳定性控制研究

针对高速车辆侧风稳定性问题,搭建了汽车多体动力学(multi-body dynamics,MBD)和计算流体力学(computational fluid dynamics,CFD)双向耦合平台,并基于该平台设计了一种侧风稳定性控制系统.该系统的上层控制器基于滑模理论计算出侧风干扰下的高速车辆为维持稳定所需的附加横摆力矩...     

高铁运用安全的三大技术局限性

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.