Investigating the re-adhesion performance of locomotives with bogie frame suspension driving system

Abstract

ABSTRACT The readhesion performance and driving system dynamics of locomotives with bogie frame suspension driving system were investigated. To investigate the driving system’s vibration characteristics in the adhesion saturation state and the influencing factors for locomotive’s readhesion performance, a train dynamic model was established. According to the simulation results, increasing the torsional stiffness of six-bar double hollow shaft coupling and adopting the traction motor with hard mechanical characteristics are beneficial for the locomotive’s readhesion performance. Besides, increasing the motor suspension stiffness within a certain range is advantageous. Moreover, resonance analysis was conducted, which indicated that the resonance of the driving system occurs if the natural frequency of wheelset’s longitudinal vibration is close to the rotary vibration natural frequency or its frequency doubling. Reasonable matching of primary longitudinal stiffness and six-bar double hollow shaft coupling stiffness is emphasized.