Semiactive Control of Hunting Stability in Rail Vehicles
Semiactive Control of Hunting Stability in Rail Vehicles
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DOI：
10.1115/imece2005-82617
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
M. Ahmadian;A. Mohan
中科院分区：
文献类型：
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作者：
M. Ahmadian;A. Mohan
本文讨论了一种通过半主动控制悬架元件来改善轨道车辆寻迹性能的方法。这种方法的重点是在作战速度范围之外增加临界狩猎速度。早期的研究表明，临界速度对初级纵向刚度KPX最为敏感。较高的初级纵向刚度可以显著提高轨道车辆的临界狩猎速度。但是，具有高值的KPX很大程度上是不受欢迎的，因为这将使轮对悬架非常刚性。由于钢轨缺陷引起的任何对车轮的扰动都会导致运动方程中的强迫函数，从而促进轮对振荡的周期性传递到车身，从而导致较差的行驶质量。作为在整个过程中使用持续高KPX值的替代方案，尝试了一种半主动方法，即在大部分模拟时间中假设KPX的标称值。在需要的基础上，这个值增加了振荡周期的有限部分。作为一种初始方法，KPX的值被设定为轮对横向偏移的函数。在轮对横向偏移低于预设阈值的持续时间内，假设KPX值适中。当横向位移超过该阈值时，KPX值增加到原值的10倍。人们认为，这种方法会提高临界狩猎速度，并推动振荡向中心下降。但仿真结果表明，该策略几乎没有提高临界速度。随后的一种方法是使KPX的值成为轮对偏航位移的函数。这种方法显著提高了临界速度。ASME版权所有©2005
This paper discusses a methodology for improving hunting behavior in rail vehicles by semiactive control of suspension elements. This methodology focuses on increasing the critical velocity of hunting beyond the operational speed range. Earlier studies have shown that the critical velocity is most sensitive to the primary longitudinal stiffness, KPX . A higher primary longitudinal stiffness can significantly increase the critical hunting velocity of the rail vehicle. But, having high values of KPX is largely undesirable, since that would make the wheelset suspension very rigid. Any disturbance to the wheels due to imperfections in the rails will result in a forcing function in the equations of motion, thereby facilitating the transfer of the recurrent wheelset oscillations to the car body, leading to a poorer ride quality. As an alternative to using sustained high values of KPX throughout the ride, a semiactive approach has been attempted, whereby, a nominal value of KPX was assumed for the majority of the simulation time. On a need basis, this value was made to increase for limited portions of the oscillatory cycle. As an initial approach, the value of KPX was made to be a function of the wheelset lateral excursion. A moderate value of KPX was assumed for the duration of time that the wheelset lateral excursions were below a preset threshold value. Whenever the lateral displacement exceeded this threshold limit, the value of KPX was increased to 10 times the original value. It was thought that this approach would raise the critical hunting velocity, and drive the oscillations down towards the center. But simulation showed that this strategy barely improved the critical velocity. A subsequent approach was to make the value of KPX a function of the wheelset yaw displacement instead. This approach yielded a significant improvement in the critical velocity.Copyright © 2005 by ASME