University of Twente Student Theses


Logistiek achter wiel-rail-conditionering: welke treinstellen moeten uitgerust worden met een WRC systeem om overal in Nederland het spoor te conditioneren?

Bisschop, S.H. (2012) Logistiek achter wiel-rail-conditionering: welke treinstellen moeten uitgerust worden met een WRC systeem om overal in Nederland het spoor te conditioneren?

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Abstract:The Dutch rail network is one of the busiest rail networks in the world. Still the pressure on the network is increasing. With an increasing demand of traffic, also costs for maintenance, reliability and noise reduction increase. This thesis is focussing on the aspect of noise reduction. The Dutch railway manager ProRail has started research to lubricate the railroad by existing rolling stock. This method is called Wheel-Rail-Conditioning (WRC). Trains equipped with WRC lubricate the track and thereby influence the coefficient of friction. By reducing the coefficient of friction to the lowest level within the safety limits, sound production can be reduced, especially the squeal, the high squeaking sound when a train goes through a curve. The aim of this thesis is to determine how many and which trains in the Netherlands have to be equipped with Wheel-Rail Conditioning (WRC) to achieve a countrywide covering of the track with the lubricant. This thesis is focusing on NSR, the largest passenger carrier on the Dutch railways. A brief introduction on the theoretical results of lubricating railways is given in order to find a solution. Also a short overview of the different pilots where WRC is tested is given. Currently tests are still in progress, on the Valleilijn, the track between Amersfoort and Ede and on the track between Nijmegen en Zutphen. Out of these pilots crucial information for countrywide implementation needs to be extracted. Especially the duration of a lubricant applied by a train is of great importance. To get insight in the circulation of trains on the Dutch railway, data of NSR is analysed with respect to the first half of ‘dienstregeling 2011’. Out of this data train types are divided in groups with regional bindings. To determine which trains have to be equipped with WRC, four different approaches are proposed. These approaches differ in complexity and are based on various pilots and theoretical results. One of these approaches is chosen and worked out in depth. The underlying model is based on the fact that trains equipped with WRC fully lubricate a track by passing over it. The lubricant wears by every train passage until no lubricant is left. The solutionmethod is based on local search and built specifically for this application. Hereby it makes use of simulated annealing to avoid being stuck in local minima. In addition computation time is significantly reduced by effectively calculating constraints and by keeping track of a tabulist. These adaptions result in a model that calculates which trains have to be equipped with WRC in about eighty hours. This approach is calculated several times whereby the fraction of passages on unlubricated track and the duration of the lubricant are varied. For different combinations of parameters an allocation of the WRC units is found for each traintypegroup. An overview is given of the conditions under which the anser holds. The results are also compared to intuitive allocations of WRC units given by ProRail.
Item Type:Essay (Master)
Strukton Systems
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:31 mathematics
Programme:Applied Mathematics MSc (60348)
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