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Technical Brief

On the source of the systematic error of the pressure measurement film applied to wheel-rail normal contact measurements

[+] Author and Article Information
Jagoba Lekue

Chair and Institute of Rail Vehicles and Transport Systems, RWTH Aachen University, Seffenter Weg 8, Aachen 52074, Germany
lekue@ifs.rwth-aachen.de

Florian Dörner

Chair and Institute of Rail Vehicles and Transport Systems, RWTH Aachen University, Seffenter Weg 8, Aachen 52074, Germany
doerner@ifs.rwth-aachen.de

Christian Schindler

Chair and Institute of Rail Vehicles and Transport Systems, RWTH Aachen University, Seffenter Weg 8, Aachen 52074, Germany
schindler@ifs.rwth-aachen.de

1Corresponding author.

ASME doi:10.1115/1.4037358 History: Received February 02, 2017; Revised July 15, 2017

Abstract

This paper presents research activities regarding the systematic error of the pressure measurement film when measuring the area of the wheel-rail contact. In particular, an explanation for the different error rates shown by the different film types was sought. A finite element model was created based on the assumption that not only the film, but also the microcapsules on top of it alter the results. The performance of the existing film models was enhanced by defining microcapsules with element failure and deletion behaviors. The new model was capable of reproducing the trend shown by the systematic error in the experiments. The simulation results confirmed that the measurement error of a certain film type is not only caused by the film itself, but also depends on the failure pressure and especially the diameter of the capsules.

Copyright (c) 2017 by ASME
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