Analysis of dynamic behaviour of high-speed railway vehicle with faulty anti-hunting damper

Wang Yi-Xuan, Chen En-Li, Qi Zhuang, Liu Peng-Fei, Zhang Lin


With factors such as temperature, pressure and the percentage of the air in oil taken into consideration, the relation between the force of the faulty damper and the gap of oil seal is analyzed by observing the change of the oil stiffness while the oil seal was worn continually. And the influence of the faulted damper on the stability, running performance and the curve negotiation capability of high-speed train is analyzed by using the Adams/Rail software package. The full vehicle models with different degrees of faulty anti-hunting dampers were simulated. Results show that the excessive worn of the oil seal of the anti-hunting damper can lead to the decrease of its oil stiffness, which reduces its actual damper force. The working condition of anti-hunting damper has great effect on train stability. If the worn oil seal deteriorated continually, the nonlinear critical velocity of the high-speed vehicle would be reduced seriously. When the oil seal gap wears to 0.2 mm, the critical velocity of the vehicle with faulty anti-hunting damper decreases by 21.4% compared to the normal vehicle. And the lateral axial force would be increased by 4.2 % when the oil seal gap is worn to 0.2 mm on curve track. However it can hardly affect the vertical running performance.

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