Dynamic Vehicle Response On Horizontal Curves
Equivalent To Turnout Curves Through Swedish
UIC60 Turnouts
Author(s)
B. Kufver & O. Rydell
Abstract
In conjunction with an evaluation of vehicle dynamics on horizontal curves
where transition curves are not used, the Swedish turnout geometries have been
evaluated. The study quantifies the dynamic vehicle response on alignments
according to Swedish UIC60 turnouts and compares it with vehicle response on
limiting cases according to applicable track standards. Vehicle dynamics is
quantified where there are curves in opposite directions, as in crossovers with
4.5 m track distance. Vehicle dynamics is also illustrated where there are circular
curves in the same direction, connected by a short intermediate straight. When a
vehicle enters a circular curve, there will be a transient change from the lateral
steady-state position on the straight to a new steady-state position on the curve.
The simulations show that this transient change in position increases the dynamic
lateral wheel/rail forces at the wheel/rail interface compared to the steady-state
values on the circular curve. For each curve entry, there is an unfavourable peak
load. Such peak loads occur both on circular curves in opposite directions and on
circular curves in the same direction that are connected with a short intermediate
straight.
Keywords: vehicle dynamics, alignment, horizontal curves, turnouts, sidings.
1 Introduction
In Japan, Sweden, USA, and China, several studies on alignment optimisation,
based on simulations of vehicle dynamics, have been conducted. Various types
of transition curves and cant transition ramps (linear or S-shaped) have been
Keywords
vehicle dynamics, alignment, horizontal curves, turnouts, sidings.
Related Book
Other papers in this volume
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