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The authors researched and developed a new measurement method that can continuously measure the contact forces and derailment coefficients at all curves of commercial lines. This new method can determine the derailment coefficients, which change according to the friction coefficients and other factors, using the measuring system on in-service trains. In this paper, the analysis results for actual...
Through the development of measurement tool of rail and wheel profiles, it is much easier to acquire the precision data of the profiles. Although most of the digital data are used independently for the purposes of rail or wheel profile management at present, such data make it possible to analyze the contact status especially to identify the location of the contact point between rail and wheel tread...
Measurement of wheel–rail contact forces is very important, but it is not executed so often because of its difficulties. A new measuring method introduced in this paper can measure such contact forces without special wheelsets equipped with strain gauges and slip rings or telemeters. In this method the lateral contact force is measured from the lateral distortion of wheel measured directly by several...
In very sharp curved tracks where the efficient difference of rolling radius between inside/outside wheels is hard to obtain by the bogie, various ill-suited phenomena, such as rail corrugation, squeal noise, derailment and etc., are occurring. The purpose of this study is to avoid these phenomena. The effect of friction modifier on the improvement of bogie curving performance has been systematically...
From full-scale stand tests, commercial line experiments and numerical simulation, we found that corrugation of rail in curve section of track is formatted by stick-slip vibration between wheel and rail, which is caused by the large creepage and vertical force fluctuation on wheel/rail contact surface. On the basis of this theory, we analyzed the growing process of corrugation by numerical simulation.
In order to carry out the research project, which we call ''Development of Intelligent Active Wheel,'' a test facility of roller stand with 1/5 scaled truck is developed. Creep force characteristics between the roller rail and wheel at varied contact conditions are measured. From the measured results it is found that, in clean contact condition, creep force characteristics become negative as the creep...
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