This article describes an investigation on the relative motion between wheel-set andudrails.Through the search of an equilibrium configuration, the positions of contact points betweenudrails and wheels are first located. The detection methods allow also the definition of the normaludunit vectors to rail and wheel at contact points. To reduce computing time, the results are storedudin a lookup table accessed during the dynamic analyses of wheel-sets, bogies, or trains. The useudof lookup table considerably speeds up contact detection when numerically integrating withudrespect to time.
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