Longitudinal vibration analysis based on driving force variation test in the train set

Abstract

The variation in driving or braking force between the wheel and rail, which may cause longitudinal vibrations of the vehicle, sometimes causes reduction in adhesion and increases gliding. It is essential to elucidate the relationship between tractive force and longitudinal vibration in consideration of the electric and mechanical system in order to build a motor control method which can improve tractive force and reduce longitudinal vibration in the train set. In previous researches, numerical analysis methods for coupled motions in the vertical and longitudinal directions have been developed by introducing a sophisticated model of forces acting on the coupler. In the past, this analysis method has not been applied to the study of vehicle longitudinal vibration in a train. However, in recent years, the applicability to the analysis of vehicle longitudinal vibration has been studied, but it has not yet been fully studied. Therefore, in this report, the authors compare the test results with the numerical results when the fluctuating driving force is given to the numerical analysis model in order to confirm the effectiveness of numerical analysis. Furthermore, by using the numerical analysis, it is clarified that the frequency characteristics of the longitudinal vibration of the car body generated in the train due to the fluctuation of the driving force.

Keywords

• railway
• vehicle dynamics
• train set
• coupler force
• buffer
• draft gear
• longitudinal vibration analysis