Title: A switch model for the study of powered axles stick-slip

Authors: Razvan Andrei Oprea; Cristina Mihaela Tudorache; Cornelia Stan

Addresses: Railway Vehicles Engineering Department, University Politehnica of Bucharest, str. Rucar 12, s1, Bucharest 012257, Romania ' Railway Vehicles Engineering Department, University Politehnica of Bucharest, str. Rucar 12, s1, Bucharest 012257, Romania ' Automotive Department, University Politehnica of Bucharest, str. Rucar 12, s1, Bucharest 012257, Romania

Abstract: The use of high-power railway vehicles requires enhanced control of wheel-rail adherence. The aim of the present work is to prove the appropriateness of non-smooth models in the study of the axle torsional stick-slip vibrations which may occur when traction vehicles are set into motion. The model is simple, observes the main friction characteristics and provides the basis for efficient dynamics simulation. A set-valued friction law is accounted for and the motion equations are formulated as a switch model. Numerical integration is done by an event-driven algorithm. Application examples are presented. An experimental setup comprising a reduced-scale wheel set is analysed to validate the model proposed. The friction parameters are then identified using the proposed force-creepage relationship. Validation and verification are further carried out in frequency domain. Related problems may be solved using the present method, as it is pointed out in the paper.

Keywords: stick-slip; torsional vibration; non-smooth models; dry friction; driving axles; switch models; powered axles; vehicle vibration; dynamic modelling; rail vehicles; railway wagons; wheel-rail adherence; simulation; heavy vehicles.

DOI: 10.1504/IJHVS.2015.073204

International Journal of Heavy Vehicle Systems, 2015 Vol.22 No.4, pp.338 - 355

Received: 05 Sep 2014
Accepted: 17 Jul 2015

Published online: 27 Nov 2015 *

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