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Model of positioning objects by the system of oblique friction force fields on horizontal and vertically offset planes.

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Title: Model of positioning objects by the system of oblique friction force fields on horizontal and vertically offset planes.
Authors: Piatkowski, T.1 (AUTHOR) topiat@utp.edu.pl, Wolski, M.1 (AUTHOR)
Source: Mechanism & Machine Theory. Feb2021, Vol. 156, pN.PAG-N.PAG. 1p.
Subjects: Friction, Conveyor belts, Reaction forces, Dry friction, Dynamic models
Abstract: • Oblique friction force fields are located on two planes with different levels. • Vertical offset of the friction force planes reduces the angle of object rotation. • Object is treated as rigid body with soft surface of the bottom. • Normal compression forces are described by two continuous impact models: NA, NK. • Friction forces are described by three models: SB, SA, DL. The paper presents a model of the process of angular positioning of cuboidal objects using a system of two oblique friction force fields produced by the conveyor belts located on parallel planes a and b , offset vertically by value H. It has been assumed that, while moving from friction force field a to lower placed field b , the object performs a 3D motion and comes into contact with the friction force fields at the corners, edges or the base surface. The object is treated as a rigid body with a soft surface of the bottom, which can be subjected to significant local deformations when interacting with obstacles. Two continuous collision models were used to describe the normal reaction forces at the contact points of the object with the bearing surfaces of the conveyors: the nonlinear MSC Adams model and the modified nonlinear Kelvin model. In addition, three friction models were included, i.e. two static Bengisu-Akay and MSC Adams models and one dynamic LuGre model. Numerical and experimental research demonstrate that the use of friction force fields with vertical offset of a short distance (e.g. H = 0.005 m) enhances the rotation angle Φ minimization of the object positioned. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Oblique friction force fields are located on two planes with different levels. • Vertical offset of the friction force planes reduces the angle of object rotation. • Object is treated as rigid body with soft surface of the bottom. • Normal compression forces are described by two continuous impact models: NA, NK. • Friction forces are described by three models: SB, SA, DL. The paper presents a model of the process of angular positioning of cuboidal objects using a system of two oblique friction force fields produced by the conveyor belts located on parallel planes a and b , offset vertically by value H. It has been assumed that, while moving from friction force field a to lower placed field b , the object performs a 3D motion and comes into contact with the friction force fields at the corners, edges or the base surface. The object is treated as a rigid body with a soft surface of the bottom, which can be subjected to significant local deformations when interacting with obstacles. Two continuous collision models were used to describe the normal reaction forces at the contact points of the object with the bearing surfaces of the conveyors: the nonlinear MSC Adams model and the modified nonlinear Kelvin model. In addition, three friction models were included, i.e. two static Bengisu-Akay and MSC Adams models and one dynamic LuGre model. Numerical and experimental research demonstrate that the use of friction force fields with vertical offset of a short distance (e.g. H = 0.005 m) enhances the rotation angle Φ minimization of the object positioned. [ABSTRACT FROM AUTHOR]
ISSN:0094114X
DOI:10.1016/j.mechmachtheory.2020.104155