A switch model for the study of powered axles stick-slip
by Razvan Andrei Oprea; Cristina Mihaela Tudorache; Cornelia Stan
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 22, No. 4, 2015

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.

Online publication date: Fri, 27-Nov-2015

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