STUDY ON DYNAMIC CHARACTERISTICS OF TRAIN-TRACK SYSTEM IN CURVES BASED ON ELABORATE MULTI-VEHICLE MODEL

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (22) : 1-6.

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STUDY ON DYNAMIC CHARACTERISTICS OF TRAIN-TRACK SYSTEM IN CURVES BASED ON ELABORATE MULTI-VEHICLE MODEL

WANG Pu, GAO Liang, CAI Xiaopei, YE Jun

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Abstract

An elaborate heavy haul train-track coupling dynamic model is established, taking into account multiple vehicles. Various components and interactions between components (e.g. contact friction) in the vehicle and coupler buffer device are modeled detailedly. The wheel-rail contact interactions are calculated based on Hertz’s theory and Kalker’s FASTSIM algorithm. The track model is established with the help of field parameter experiments conducted through self-developed devices. Dynamic characteristics of train-track system in curve sections and influence regularities of curve parameters on dynamic characteristics are investigated and the following conclusions are drawn: 1) The wheel-rail interactions are complicated in transition curve sections. Forces of different wheels present different variation trends and amplitudes, and wheel-rail interactions are also definitely different in front and rear transition curve sections. This is mainly caused by the superelevation slope and the vehicle structure. It is rather adverse for the train operation if the length of transition curve is too short. There usually exists an inflexion in the influencing curves of transition curve length on dynamic characteristics. It is suggested the smallest length of transition curve be determined according to the inflexion value. Lengthening the transition curve can effectively decrease the wheel-rail interactions and decrease the total wear mainly through reducing the wear of the leading vehicle and guide wheelsets. However, as the length of transition curve increases, the improvements of dynamic characteristics become less obvious. 2) The superelevation of the outer rail in small-radius curves is generally large in heavy haul railway of China. It is suggested to reduce the superelevation properly and set an inadequate superelevation of 10%-20%, which is conductive to decreasing the wheel-rail interactions and wear. 3) Increasing the radius of curve is advantageous for improving the wheel-rail interactions. While the improvement becomes smaller with the radius increasing larger.

Key words

heavy haul railway / curve / train-track coupling dynamics / multi-vehicle effect / coupler buffer device

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WANG Pu;GAO Liang;CAI Xiaopei;YE Jun. STUDY ON DYNAMIC CHARACTERISTICS OF TRAIN-TRACK SYSTEM IN CURVES BASED ON ELABORATE MULTI-VEHICLE MODEL[J]. Journal of Vibration and Shock, 2014, 33(22): 1-6