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Influence of train axle load on wheel-rail interface friction

机译:火车轴载荷对轮轨界面摩擦的影响

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The implementation of high speed railways in India are in their early phases and vast studies are being conducted for the effective implementation of the system.Maintaining the traction required for efficient operation of trains at high speeds requires the net minimum frictional coefficient to be maintained at the wheel-rail interface,across the desired range of axle loads and target speeds of train operation.With the increase in speed,wheels of the train tend to lift-off,effectively reducing the interface friction at the wheel-rail contact.In this study,the effect of increasing the axle load on the effective frictional coefficient available at wheel-rail interfaces during high speed railway operations were quantified by numerical simulations,and the results reveal that the net frictional coefficient available at the wheel-rail contacts have a trend to increase with an increase in the applied axle loads.Conversely,this instead points out that decreasing the axle loads for achieving higher speeds of train operation will result in reduction of traction,and there will be chances of wheel-slips on the rails during rapid acceleration and emergency braking situations.Modifying the rail surface friction using top-of-rail friction modifiers are a much easier alternative to making amendments in the wheel-rail profiles,for maintaining sufficient traction on rails.In the wheel-rail interfaces with high friction,lubrications in the boundary regime,mixed lubrication or hydrodynamic lubrication are applied on the basis of Stribeck curve,adopting the optimum frictional coefficients for avoiding rolling contact fatigue and high rates of wear due to plastic deformations.When there is less frictional grip,a coating of top-of-rail positive friction enhancers becomes necessary,for increasing the adhesion characteristics and achieving positive creep.This study emphasizes the importance of optimizing the contact at wheel-rail interfaces,to maintain the frictional coefficients to neither cause loss of traction due to lower grip,nor be on the higher side to cause rolling contact fatigue and high rates of material wear.
机译:印度的高速铁路的实施处于早期阶段,正在进行巨大的研究,以进行有效实施该系统。尖锐的牵引力在高速下有效运行列车需要保持最小摩擦系数,以便保持最小摩擦系数轮轨界面,穿过所需的轴载荷和火车操作的目标速度。随着速度的增加,火车的车轮倾向于剥离,有效地减少了轮轨接触的界面摩擦。在这项研究中,通过数值模拟量化了在高速铁路操作期间,在高速铁路操作期间可用的轴载对车轮轨道接口有效摩擦系数的影响,结果表明,轮轨接触处可用的净摩擦系数具有趋势随着施加的轴载荷的增加而增加。相反,这指出了减少用于实现HIG的轴载荷她的火车操作速度将降低牵引力,在快速加速和紧急制动情况下,在轨道上有轮滑轮的机会。使用顶轨摩擦改造器进行轨道表面摩擦是一个更简单的替代方案为了在轮轨轮廓中进行修正,用于在轨道上保持足够的牵引力。在具有高摩擦力的轮轨接口,边界制度,混合润滑或流体动力润滑的润滑基于Stribeck曲线,采用最佳摩擦系数为了避免滚动接触疲劳和由于塑性变形而导致的高磨损率。当摩擦夹具较小时,需要涂覆顶部轨道阳性摩擦增强剂的涂层,以增加粘附特性和实现阳性蠕变。本研究强调优化轮轨接口的接触的重要性,以保持摩擦系数既不由于较低的抓地力而导致牵引损失,也不是较高的一侧,以引起滚动接触疲劳和高材料磨损率。

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