Abstract
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.
Highlights
Many studies describe measurements of the belt friction forces
In that cited study, the Authors loaded the belt with a preload force of only up to 411 N
The calculated values are a function of the preload force shown in the Figure 8
Summary
Many studies describe measurements of the belt friction forces. Works presenting results of investigations about belts conducted in centuries up to 1981 were summarised in a widely cited article [7]. The results of the experiments help to create new friction models between the belt and the pulleys or to fit values of coefficients to existing ones. The dynamic friction coefficient in the belt-pulley contact is difficult to measure because of the flexibility of rubber. Transmission power losses caused by, among others, specified wrap angles or belt tension, have been described in [14]. It decided to measure poly-V 5pk belt with corresponding pulley. Wrong or old contaminated rubber may change friction coefficients, what can cause noises, or their improper work of the transmission. This may cause the battery to fail or the engine to overheat. It is very important to measure frictional parameters of the belt and the pulley
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