Effect of internal dynamic excitation of the traction system on the dynamic behavior of a high-speed train

This study investigates the effect of an internal dynamic excitation of the traction system on the dynamic performance of a high-speed train. First, a dynamic model of the traction system is developed that considers various complex factors such as the time-varying stiffness of meshing teeth pairs and the gear transmission error. The internal exciting force of the gear is taken to be the result of multiplying its meshing stiffness by its transmission error. Then a multi-body dynamics model of the motor car that includes the driving system is established. Furthermore, a field experiment at a high-speed rail line is performed. Based on the test data, the dynamic characteristics of a high-speed train are analyzed. The obtained results show that the internal dynamic excitation of the traction system can significantly influence the vertical vibration of the frame and gearbox; however, it has little effect on their lateral vibration. The sampling frequency has a major effect on the vibration amplitude of the gearbox; frequency spectrum results show that when the train runs at a high speed, the main vibration frequencies of the gearbox are the meshing frequency and its harmonic frequencies. It is demonstrated that it is necessary to take the internal dynamic excitation into account when assessing the dynamic performance of the gear transmission system.