On Enhanced Tilt Strategies For Tilting Trains
Author(s)
B. Kufver & R. Persson
Abstract
Many railways have taken tilting trains into operation on lines with horizontal
curves with small radii. Tilting trains have vehicle bodies that can roll inwards,
thus reducing the lateral acceleration perceived by the passengers. Hence, tilting
trains can run through curves at an enhanced speed. However, too much tilt can
cause motion sickness among sensitive passengers. The tilt motions, generated
by computer-controlled actuators should be optimised with care, taking the local
track geometry and actual train speed into account. This paper presents tilt
algorithms aimed at balancing conflicting objectives. Furthermore, the paper
discusses the usefulness of route files (track geometry data) onboard the train
and possible positioning systems.
Keywords: tilting train, tilt algorithm, tilt strategy, alignment, cant, passenger
comfort, motion sickness.
1 Introduction
The idea of tilting trains on lines with curves with small radii was discussed
already during the 1930s [1, 2]. Tilting trains have vehicle bodies that can roll
inwards, thus reducing the lateral acceleration perceived by the passengers.
Hence, tilting trains can run through curves at an enhanced speed. Nowadays, it
is a mature technology that many railways have taken into revenue service.
However, experience shows that tilting trains can cause motion sickness
among sensitive passengers [3–11]. The mechanisms behind motion sickness are
not fully understood, but there is evidence that high roll velocities, generated by
steep superelevation ramps in the tracks and by a high compensation ratio in the
tilt system, contribute to the onset of motion sickness. Hence, too little tilting
will cause discomfort caused by high lateral acceleration, while too much tilting
may provoke motion sickness.
Keywords
tilting train, tilt algorithm, tilt strategy, alignment, cant, passenger
comfort, motion sickness.
Related Book
Other papers in this volume
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