Wheel-rail adhesion performance of high-speed trains with lift wings passing through the curved track
A vehicle system dynamic model considering factors such as wheel-rail relationship,lift wings,and fluid-solid coupling characteristics was established.The motion attitude and wheel-rail contact characteristics of a high-speed train with lift wings passing curves were analyzed,and the wheel-rail adhesion performance during curve operation was studied.The effects of track irregularities,curve radius,train speed,and wheel-rail contact conditions on the wheel-rail adhesion performance were investigated.The results show that aerodynamic lift redistributes the vertical and longitudinal creep forces of the inner and outer wheels by changing the dynamic response and wheel-rail contact characteristics of the train,causing the inner wheel more likely to lose adhesion.Increasing aerodynamic lift and train speed both degrades the wheel-rail adhesion performance,but increasing the curve radius significantly improves the adhesion level.Track irregularities weaken the wheel-rail adhesion performance,and the adhesion level under dry,wet,and oily conditions deteriorates accordingly.When the train is in traction operation,circumstances in dry,wet and oily conditions can meet the safe limit of traction force requirement,but during braking operation,those circumstances in wet and oily conditions cannot satisfy the safe limit of braking force requirement.The research results can provide technical support for the safe operation and energy-efficient design of ultra-high-speed trains.
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