Characteristics of Asymmetry Motion in the Axle Vertical Plane on the Dynamic Response of Railway Wagon

Abstract

The aim of this paper was to analyse the effect of symmetrical and anti-symmetrical excitation modes on the vertical dynamic responses of the railway vehicle. A 9-DOF mathematical model representing the railway wagon was developed using the Lagrange’s equation to obtain the system’s equations of motion. The equations of motion were uncoupled and solved by numerical integration using piecewise constant as interpolation functions, and thereafter, the model was validated using measured data. The discrepancies between the surveyed paths and the paths predicted by the model were found to be in the range of 6.34% (maximum) to 3.64% (minimum). Tens of reproducible simulation responses were carried out with the model to obtain data for the analysis. The results confirmed that, the effect of symmetrical and anti-symmetrical excitation modes changes the behaviour of the system.