Influence Of Vehicle Unsprung-mass
On Dynamic Wheel Load
Author(s)
M. Miwa, Y. Kawasaki & A. Yoshimura
Abstract
Dynamic wheel load variation is one of the major causes of railway track
deterioration and ground vibration. Lightening of vehicle unsprung-mass is more
effective on reducing dynamic wheel load than that of sprung or intermediatemass.
In this paper, we estimate and discuss this effect by combining the
following three methods; (1) field tests and measurements with a special
equipped train, (2) an experimental method with a unique test facility and real
track, and (3) a computer simulation which can calculate dynamic interaction
between vehicle and track.
Keywords: vehicle-track interaction, computer simulation, test facility, field
measurement, dynamic wheel load, unsprung-mass.
1 Introduction
The vehicles for Tokaido Shinkansen trainsets replaced lightweight ones in the
period 1992 to 2004 for the purpose of maximum operation speed up from
220km/h to 270km/h. The axle load of the vehicles was reduced by about 29%,
which contributed to preventing an increase in track maintenance and/or ground
vibration. However, at that time, we did not have a clear idea of which weight
among the unsprung, intermediate and sprung-mass in a vehicle should be
reduced. Through our studies since then, it has become clear that the unsprungmass
effects most significantly the dynamic wheel load variation, which may
deteriorate railway tracks. Three methods, field measurement with the test train,
experiments in a laboratory with a large scale test facility and computer
simulation of vehicle-track dynamic interaction, are used for these discussions.
Keywords
vehicle-track interaction, computer simulation, test facility, field
measurement, dynamic wheel load, unsprung-mass.
Related Book
Other papers in this volume
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