Measurement Of Vehicle Ground Speed With
Inertia Sensors – Computation Issues
Author(s)
T. X. Mei & H. Li
Abstract
This paper proposes a new method for the measurement of train speed using
bogie mounted inertial sensors, which may achieve a measurement accuracy far
better than what is specified in UIC-5014-05 for wheel slide control. The
proposed method measures the speed from a time shift between the dynamic
motions of two wheelsets which are derived from the responses of a railway
bogie to track excitations, in particular track irregularities that always exist in rail
tracks. Two inertial sensors will be required and mounted onto a bogie frame to
measure the bounce and pitch accelerations (or lateral and yaw accelerations).
The measured signals will be processed via dedicated filters to produce estimated
wheelset movements (i.e. the track irregularities). The principle of the proposed
method will be presented, but the paper will be mainly focussed on the
assessment of computational demand and impact on measurement performance.
Keywords: vehicle ground speed, indirect measurement, inertia sensors.
1 Introduction
The absolute speed of trains is one of essential parameters in railway operations
and also essential for modern traction and braking control systems.
Conventionally, the vehicle speed is measured indirectly from the rotational
speed of wheels using encoders [5]. However the measurement accuracy of the
technique is compromised by changes in wheel radius (due to wear, or lateral
movement of the wheels) and limited resolution of the encoders acceptable for
rail applications, but more critically the measurement may become completely
unacceptable when wheel slip or slide occurs in acceleration (under traction) and
deceleration (in braking) operation modes. A number of alternative
Keywords
vehicle ground speed, indirect measurement, inertia sensors.
Related Book
Other papers in this volume
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