The paper presents the results of numerical and experimental studies on the translational positioning process of unit loads (e.g., postal parcels) using a system of two counter-driven belts. Numerical studies are conducted based on a theoretical description of the positioning process, utilizing the static Karnopp friction model and the dynamic LuGre model. In the Karnopp model, two classic friction coefficients (described by one and two parameters) were applied, as well as a non-linear friction coefficient described by a third-degree B-spline curve (determined based on experimental studies). The analysis of the obtained data indicates that the non-linearity of the kinetic friction coefficient characteristic of the manipulated loads has a decisive influence on the efficiency of the positioning process.One of the most significant elements of models describing the course of the manipulation process (e.g., positioning, sorting) of unit loads transported on conveyors is the identification of dry friction [4], [5], [6]. Currently (…)
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Source: Logistyka Magazine 6/2008