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Title: Evaluation of velocity and curvature dependence for roadgrip measured by low lateral slip

Authors: Johan Casselgren; Sara Rosendahl; Niclas Engström; Ulrika Grönlund

Addresses: Fluid and Experimental Mechanics, Luleå University of Technology, SE-971-87 Luleå, Sweden ' Experimental Physics, Luleå University of Technology, SE-971-87 Luleå, Sweden ' LKAB, SE-981-86 Kiruna, Sweden ' Autoliv Sverige AB, Active Saftey Tech Center, Datalinjen 3 SE-583-30 Linköping, Sweden

Abstract: Roadgrip is an important parameter for vehicle testing and road maintenance. Therefore, an evaluation of the velocity and curvature effects on roadgrip measurement was performed on asphalt roads and on two ice tracks using the continuous roadgrip apparatus RT3 Curve. The aim was to find suitable driving patterns for measurements on public roads and test tracks to ensure the repeatability of roadgrip measurements. During the evaluation, it was concluded that in order to achieve a reliable roadgrip value, regardless of road conditions, the radius of curvature should not be less than 20 m. The velocity dependency of the RT3 Curve is different for the two road conditions, with the measurements on ice being much more sensitive to velocity changes than the measurements on the dry asphalt.

Keywords: friction; roadgrip; velocity dependence; slip angle; tyres; RT3 Curve; curvature; low lateral slip.

DOI: 10.1504/IJVSMT.2017.087936

International Journal of Vehicle Systems Modelling and Testing, 2017 Vol.12 No.1/2, pp.1 - 16

Available online: 09 Nov 2017 *

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