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Optical Measurements of Rolling Friction Coefficients
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents an optical method to measure the rolling friction coefficientsfor balls rolling freely on a cylindrical surface. Two different models of a ball rollingfreely on a cylindrical surface are established, one is an analytical model and the otheris a numerical model derived from Lagrange equation. The rolling friction coefficientsare evaluated from the position data of the steel balls. The positions data are retrievedfrom images recorded by a high-speed camera. The locating algorithms includingbackground subtraction and ball recognition are presented in detail. The rollingfriction coefficients between different diameter steel balls and a cylindrical aluminumsurface are measured. The angular positions of the balls are predicted by the solutionof the equation of motion (EOM), and good agreements are found between theexperimental and theoretical results. The values of rolling friction coefficientsbetween different diameter steel balls and a cylindrical aluminum surface areevaluated.

Place, publisher, year, edition, pages
Luleå, 2016.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-142ISBN: 978-91-7583-663-8ISBN: 978-91-7583-664-5 (pdf)OAI: oai:DiVA.org:ltu-142DiVA: diva2:971393
Presentation
2016-09-29, E231, Luleå, 14:00
Available from: 2016-09-16 Created: 2016-09-15 Last updated: 2016-09-21Bibliographically approved

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Li, Yiling
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Department of Engineering Sciences and Mathematics
Applied Mechanics

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