Digital Inertial Algorithm For Recording Track
Geometry On Commercial Shinkansen Trains
Author(s)
M. Kobayashi, Y. Naganuma, M. Nakagawa & T. Okumura
Abstract
The inertial method is based on a simple law that states that the double
integration of acceleration gives its displacement, and is one of the general
methods used for recording track geometry. In the inertial method, a high-pass
filter (HPF) is essential to ensure stable calculation of the double integration of
acceleration. The previous analog inertial measuring system remained wave
distortion because the system used analog HPFs, which had a non-linear phase
property. To avoid wave distortion caused by analog HPFs, a new algorithm was
developed for digital inertial measurement that utilizes the measurement property
of the 10 m versine. A new track geometry recording device using this algorithm
was produced, capable of being installed on commercial shinkansen trains. This
device, called RAIDARSS 3, measures 10 m versine track irregularities from
double integration of the axle box acceleration in real time. If the measured track
irregularities exceed the predetermined target maintenance values, the measured
values and locations of the irregularities are automatically reported to the train
control center and track maintenance depots, and slow speed operation is
directed, if necessary. To confirm the measurement precision of this device, an
experimental prototype was tested on a shinkansen test train. Results showed that
the output of the prototype achieved good correlation with data from the existing
track geometry car. The new RAIDARSS 3 track condition monitoring device
will be installed on six N700 train sets during fiscal year 2008.
Keywords: inertial method, recording track geometry, 10m versine.
Keywords
inertial method, recording track geometry, 10m versine.
Related Book
Other papers in this volume
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