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Digital image correlation techniques for measuring tyre–road interface parameters: Part 2 – Longitudinal tyre slip ratio measurement
Institution:1. Department of Mechanics of Biosystem Engineering, University of Mohaghegh Ardabili, Ardabil, Iran;2. Agricultural Engineering Research Institute, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran;1. Terramechanics, Multibody, and Vehicle Systems (TMVS) Laboratory, Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, United States;2. Vehicle Dynamics Group (VDG), Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa;1. Université de Lyon, Université Jean Monnet de Saint-Etienne, LASPI EA3059, 20 Avenue de Paris, 42334 Roanne Cedex, France;2. Laboratoire Vibrations Acoustique, Univ Lyon, INSA-Lyon, LVA EA677, F-69621 Villeurbanne, France;3. Safran Aircraft Engines, Rond Point Rene Raveau – Reau, 77550 Moissy-Cramayel, France;4. Dipartimento di Ingegneria Meccanica e Aerospaziale, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;5. Vrije Universiteit Brussel, Department of Applied Mechanics, Pleinlaan 2, 1050 Brussels, Belgium;6. DYNAE, rue Condorcet, 38090 Villefontaine, France;7. Laboratoire de Tribologie et Dynamique des Systèmes, UMR CNRS 5513, Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France;8. Flanders Make vzw, Corelab DecisonS, Gaston Geenslaan 8, 3001 Leuven, Belgium;9. Division Mecha(tro)nic System Dynamics, Department of Mechanical Engineering, KU Leuven, Belgium;10. Univ Lyon, INSA-Lyon, LaMCoS, CNRS UMR5259, F-69621 Villeurbanne, France;11. Flanders Make@KU Leuven – DMMS: Dynamics of Mechanical and Mechatronic Systems, Celestijnenlaan 300, BOX 2420, 3001 Leuven, Belgium;12. School of Mechanical and Manufacturing Engineering, University of New South Wales, UNSW Sydney NSW 2052, Australia;13. Universidad Nacional de Colombia – Sede Manizales, Signal Processing and Recognition Group, Km 9 way to magdalena, Manizales Caldas, Colombia;1. Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA, USA;2. Pratt and Miller, NC, USA;3. U.S. Army TARDEC, MI, USA
Abstract:Measurement of tyre longitudinal slip-ratio is often estimated from three independent measurements devices namely wheel rotation speed, vehicle speed and tyre rolling radius. This produces an expensive measurement system to indirectly determine the slip-ratio. This paper presents a method by which the slip-ratio is determined from a video camera using digital image correlation techniques. The camera, mounted in such a way that the contact patch region is captured, enables the system to measure the tyre tread speed and ground speed at the contact patch. The slip-ratio is then determined from these two measurements.
Keywords:Longitudinal slip  Digital image correlation  Camera  Longitudinal tyre force  Contact patch velocity
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