Digital image correlation techniques for measuring tyre-road interface parameters : Part 2 - Longitudinal tyre slip ratio measurement

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Authors

Botha, Theunis R.
Els, Pieter Schalk

Journal Title

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Publisher

Elsevier

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.

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Keywords

Longitudinal slip, Digital image correlation, Camera, Longitudinal tyre force, Contact patch velocity

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Citation

Botha, TR & Els, PS 2015, 'Digital image correlation techniques for measuring tyre-road interface parameters : part 2 - longitudinal tyre slip ratio measurement', Journal of Terramechanics, vol. 61, pp. 101-112.