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Implementation of novel wear prediction methodology for damage calculation in rail vehicles
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The discretisation of the track network and the operating conditions is an important part of a wear calculation. Due to computational cost representative track parts and conditions are selected to be simulated. The characteristic point method provides a set of simulation cases with different curvatures and non-compensated accelerations. The severity of wear as a function of curvature is considered by the energy dissipation between rail and wheel. Quasi-static multibody simulations with a Bo’Bo’ vehicle and ideal track are run in GENSYS. The normal forces are calculated with Hertz’ theory. The tangential contact problem is solved with FaStrip, a combination of FASTSIM and Strip theory. Wear is calculated with Archard’s formula. In order to simplify the implementation, wear is calculated only for one step of a full wear calculation without wheel profile updating. The result for the total wear depth over the wheel profile shows two peaks, at the flange and at the wheel tread. Further research should show the influence of using quasi-static instead of dynamics simulations with track irregularities.

Place, publisher, year, edition, pages
2018. , p. 66
Series
TRITA-SCI-GRU ; 2018:270
Keywords [en]
Wear calculation, multibody simulation, Archard’s formula, FaSTrip, characteristic points, cumulative distribution function, isoparametric formulation
National Category
Vehicle and Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-239043OAI: oai:DiVA.org:kth-239043DiVA, id: diva2:1263438
Examiners
Available from: 2018-11-15 Created: 2018-11-15 Last updated: 2025-02-14Bibliographically approved

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