Abstract
Currently, the testing for the acceptance of running characteristics of railway vehicles in Europe is ruled by EN-14363 which is derived in essential parts from UIC 518. This standard is based on present state of the art which is generally applicable for test procedures and the evaluation of stationary and ‘ontrack’ tests. It defines testing scenarios, analysis conditions and experimental measurements, and proposes limiting values for a number of different parameters mainly associated with vehicle safety and ride quality. Variables to be measured are specified for each method. The method referred to as “normal”, which is applied to the cases of the highest level of criticality (high speed and/or high axle loading) requires the measurement of forces transmitted through wheel-rail contact at several wheelsets of the vehicle.
Consequently, the accurate experimental measurement of wheel-rail forces is vital both for railway vehicle acceptance processes and for fundamental research in the field of vehicle-track interaction. Wheel-rail forces are measured by so-called “dynamometric wheelsets”, i.e. wheelsets in which multiple sensors are arranged in predetermined positions.
During the last decades, several measurement methods have been proposed. When analysing the theoretical background of the different methods it can be seen that their accuracy can vary depending on several factors such as: gyroscopic effects, shape of the wheel web, position of the wheel rail contact, vehicle speed, etc.
Generally, under extreme conditions wheel/track forces tend to be very close to the limits established in the standard, such that measurement accuracy of forces transmitted through wheel-rail contact is a highly key factor. However, the standard does not propose any measurement method, or requirements for the precision of such measurements. This results in serious uncertainties in the acceptance process. This work proposes a variety of solutions that provide an improvement over existing solutions, laying the starting basis for the development of new dynamometric wheelsets that meet current requirements for accuracy.
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Gómez, E., Alonso, A., Giménez, J.G., Vinolas, J. (2012). Railway Dynamometric Wheelsets: A Comparison of Existing Solutions and a Proposal for the Reduction of Measurement Errors. In: Ni, YQ., Ye, XW. (eds) Proceedings of the 1st International Workshop on High-Speed and Intercity Railways. Lecture Notes in Electrical Engineering, vol 148. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27963-8_25
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DOI: https://doi.org/10.1007/978-3-642-27963-8_25
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