Abstract
The purpose of this study is to investigate the mechanism of wheel load variation of a high-speed train running on rail track with short-wavelength irregularity effecting on the running safety. In order to investigate the mechanism, the numerical simulation is conducted. The simulation model consists of the two-axle bogie and the track. The track consists of rail, rail pad, sleeper, ballast. The rail is expressed as the flexible beam described using the Absolute Nodal Coordinate Formulation in order to obtain the rail deformation more precisely. As a result of this study, we obtained further the information of the wheel load variation while two wheels passing on the rail with irregularity. That is, the wheel load variation rate of two-axle bogie model at 270km/h becomes larger in the case of the irregularity wavelength 1.1-1.2m as well as one-axle bogie model. However, the difference between the leading wheel and the trailing wheel occurs in terms of the magnitude. And the magnitude relation between the leading wheel and the trailing wheel changes according to the wavelength with the irregularity. We discuss the mechanism of these phenomenon obtained by the simulation.
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