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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 104
PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Paper 115

Out-Of-Roundness: Simulation and Real-Life Measurements

R. Schmid1, P. Mittermayr2, D. Maicz3 and W. Zottl1

1Integrated Line Management, Research & Development, ÖBB Infrastruktur AG, Vienna, Austria
2Bureau of Applied Mechanics and Mathematics, Dr. Mittermayr Scientific Consulting GmbH, Vienna, Austria
3Project Management Railway, Hottinger Baldwin Messtechnik GmbH, Vienna, Austria

Full Bibliographic Reference for this paper
R. Schmid, P. Mittermayr, D. Maicz, W. Zottl, "Out-Of-Roundness: Simulation and Real-Life Measurements", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 115, 2014. doi:10.4203/ccp.104.115
Keywords: out-of-roundness, wheel flat, weigh in motion, dynamical contact forces, wear simulation, measurement site.

Summary
For more than a decade several stationary measuring sites have been installed at strategically chosen places in the network of the Austrian Federal Railways. These monitor not only overloads but also different irregularities of vehicles. Important indications to damaging vehicles are high dynamic forces. By the use of special sensors a calculation of the out-of-roundness of the wheels is possible. This allows to impressively circumstantiate the relationships found before in theoretical analyses and simulations by measuring techniques. With continuing analysis the dependency of dynamic forces on several parameters is shown and to complete the approach, the accuracy of the measurement method is considered. From these both the infrastructure operator and the train operator can benefit. The former is in a position to monitor the compliance with limits defined in the standards and to react to any irregularity immediately. The train operator profits from knowing the evolution of his vehicles condition, which enables the operator to optimise the time of maintenance measures. The experience from these projects and the long-term monitoring at the stationary checkpoints supplied valuable findings that are already used in operation.

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