Study On The Influence Of Track Conditions On
Dynamic Wheel Load Variation
Author(s)
Y. Kawasaki, M. Miwa & A. Yoshimura
Abstract
This paper presents our achievements for the deeper understanding of the
vehicle-track dynamic interactions. First we have developed \“TRADYS” (Track
& Structural Dynamics Simulator), which is the testing instrument to excite a
certain fixed point on the test track to produce the vehicle-track dynamic
interaction similar to that actually produced by the passing trains on the
commercial lines. We have also established the numerical simulation model of
the vehicle-track dynamics of TRADYS. Through the combination of the above
two experimental and theoretical approaches, we analyzed the influence of the
track conditions on the wheel load variation. In this study, we took into account
the four example track conditions for the test and the simulation, where the
assumptions were as follows: (1) Standard track condition of Tokaido
Shinkansen, (2) Instalment of less elastic rail pads instead of standard rail pads,
(3) Instalment of resilient sleepers instead of standard sleepers (4) Both above
replacements (2) and (3). The vehicle specifications of the Series 700 of Tokaido
Shinkansen with the speed at 270km/h were chosen and used in this analysis. As
a result, we obtained the following outcomes: (1) In the frequency ranges of up
to 50 Hz, the replacement of both/either the rail pads and/or the sleepers resulted
in no reductive influence on the wheel load variation. (2) On the other hand, in
the frequency ranges of over 50 Hz, the replacement of both/either the rail pads
and/or the sleepers contributed to the reduction of wheel load variation. (3) In the
frequency ranges of over 50Hz, the lower track support spring led to the weaker
transmissibility ratio of a track (irregularity) to wheel load variation.
Keywords: wheel load variation, excitation test, computer simulation.
Keywords
wheel load variation, excitation test, computer simulation.
Related Book
Other papers in this volume
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