Optimization of Characteristics of Longitudinal Creepage for Running Stability on Sharp Curved Track

Abstract

Urban railway vehicles operate in downtown areas. Due to increases in the number of passengers and changes in the service plans, railway vehicles are expected to operate on sharp curved tracks. However, on these tracks, the running stability of the railway vehicles is significantly decreased and the creepage is increased. Creepage causes the wheel/rail to wear and vibration. Therefore, reducing the creepage helps ensure the running stability and can be beneficial for the environment and cost. In this paper, the longitudinal creepage is analyzed using a railway vehicle model on a sharp curved track. Furthermore, in order to minimize the problems when a railway vehicle runs on a sharp curved track, the characteristics of a bogie are optimized using response optimization.

Study of the active radial steering of a railway vehicle using the curvature measuring method

“…(4) indicates that the circumference of the outer railroad is relatively longer than that of the inner railroad on a curved track because the rolling radius of the outer wheel increases, whereas that of the inner wheel decreases. (4) where r is the rolling radius of wheels; 0 w is the angular velocity of the wheel set; and 0 V is the running velocity of the railway vehicle. It is equal to 0 0 r w .…”

“…Thus, lateral force and wear are increased by contact interactions between the wheel and the rail, along with noise [1]. Therefore, many researchers have examined the steering mechanism of railway vehicles to improve curving performance in lieu of steering function [2][3][4]. One steering method aims to improve the selfsteering function of a railway vehicle by optimizing the primary suspension.…”