Research on Anti-slide Adhesion Utilization Control Strategy Based on Mechanism of Large Slip of Wheel-Rail Adhesion
With the increase of train speed,there is a contradiction between the requirement for brake adhesion and the reduction of adhesion coefficient under the condition of wet and slippery wheel-rail interface.Therefore,there is an ur-gent demand to break through the bottleneck of critical technologies for braking anti-slide and adhesion utilization.Ac-cording to the law of adhesion-slip characteristics during high speed braking and the influencing factors of reascending adhesion,a control strategy for anti-slide adhesion utilization based on adhesion large slip mechanism for hierarchical slide speed criterion was proposed.This strategy improved the wheel-rail adhesion coefficient by maintaining a certain slip speed to gain the sliding energy and in real time calculated the available wheel-rail adhesion coefficient during wheel sliding according to the measured tangential force at the wheel-rail cantact patch and the brake cylinder pressure of dump valve downstream,so as to appraise the improvement of wheel-rail adhesion.The results of the high-speed anti-slide sim-ulation tests conducted under different adhesion conditions based on 1∶1 high-speed wheel-rail relationship test bench show that the control strategy can self-adaptively track the available adhesion under different wheel-rail adhesion condi-tions(water,anti-freeze liquid)and improves the adaptability of the anti-slide control system to the complex operation environment of the railway and the wheel-rail adhesion characteristics.
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