Measurements of dynamic friction characteristics of the belt-pulley contact under dry conditions
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Department of Mechanics, University of Bielsko-Biała, Polska
Submission date: 2019-04-29
Final revision date: 2019-06-15
Acceptance date: 2019-06-19
Publication date: 2019-06-28
Corresponding author
Krzysztof Kubas   

Department of Mechanics, University of Bielsko-Biała, Willowa 2, 43-309, Bielsko-Biała, Polska
The Archives of Automotive Engineering – Archiwum Motoryzacji 2019;84(2):71-90
The paper presents the results of measurements of friction forces achieved by forcing slip between a poly-V 5pk belt and the pulley needed to formulate empirical models of dynamic friction. This kind of belt and pulley can be found in automotive industry to drive the alternator and coolant pump in cars. The forces were measured for several cases of assumed preload and two cases of wrap angle. The complicated stick and slip processes are simplified by assuming an average effective dynamic friction coefficient. The results show that the values of friction cannot be described by classic Euler formula. They not only depend on the velocity, but also noticed that can depend on sign of acceleration. Also, some results of the approximation are presented. It is proposed that the assumed norm will be minimised using the Nelder-Mead optimisation method. The measurements and the approximation let assume specified dynamic friction characteristics. The achieved results are applied to the model of a belt transmission. In the paper presented results of simulations of the model of belt transmission.
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