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Numerical study of wheel–rail adhesion performance of new-concept high-speed trains with aerodynamic wings

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第8期24卷 673-691页

作者： Yang CHEN Lin JING Tian LI Liang LING Kaiyun WANG State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610011China

Wheel–rail adhesion is a complex tribological problem of wheel–rail rolling contact and is closely related to the operational safety of high-speed trains.A new design concept of high-speed trains was recently proposed with an expectation of a reduction of equivalent weight and total energy consumption by installing aerodynamic wings(aero-wings)on the roof,but it was accompanied by the disadvantage of deteriorating wheel–rail adhesion *** this study,a comprehensive multibody dynamics(MBD)model of the high-speed train with predesigned aero-wings is established using the commercial software SIMPACK,in which the real aerodynamic characteristics of the train are taken into *** available adhesion and adhesion margin are employed to evaluate the wheel–rail adhesion *** influences of aero-wing lift,train speed,and contact conditions on the wheel–rail adhesion level are *** results show that the load transfer caused by the action of aerodynamic load and braking torque was the main reason for the inconsistent adhesion condition of four *** influences of aero-wing lift and train speed on the wheel–rail adhesion performance are coupled;the available adhesion of both motor car and trailer is negatively correlated with aero-wing lift and train speed under all contact conditions,while the variation law of adhesion margin with train speed shows differences under different contact *** the wheel–rail interface was polluted by a‘third-body medium’such as water and oil,the wheel–rail adhesion performance was dramatically reduced and the wheelset tended to reach adhesion saturation and ***,track irregularity had little effect on the adhesion performance and could be ignored to save calculation *** results are of positive significance for reducing the wheel idling or sliding phenomenon and to ensure the safe operation of high-speed trains with aero-wings.

关键词： High-speed train Wheel–rail adhesion aerodynamic wing Multi-body dynamics(MBD)

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