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Use of DEM to characterize damage of delicate fruit on feeders with reciprocating drive

Olejnik Tomasz P., Sobiecka Elżbieta, Kryszak Dariusz

Technologia i Jakość Wyrobów

2023

R. 68

171--186

This article describes the modeling by DEM technology of damage to highbush blueberries, during transport on a reciprocating feeder. The modeled values of normal and tangential forces at the blueberry contact points were determined, and the effect of changing the mass output of the transported fruit on the values of normal and tangential forces was studied. It has been shown that the change in the mass output of blueberries does not exceed the permissible tangential and normal forces, interacting between the fruits.

W artykule opisano modelowanie technologią DEM uszkodzeń borówki wysokiej, podczas transportu na podajniku z napędem posuwisto-zwrotnym. Określono modelowe wartości sił normalnych oraz stycznych w punktach kontaktu borówki. Przeprowadzono symulacje uwzględniające wpływ zmiany wydatku masowego transportowanych owoców na wartości sił normalnych i stycznych. Wykazano, że zmiana wydatku masowego borówki nie powoduje przekroczenia dopuszczalnych sił stycznych i normalnych, oddziałujących pomiędzy owocami.

Shear forces in the connection of structural elements under bending

Machelski C.

Studia Geotechnica et Mechanica

2013

Vol. 35, nr 3

69--83

A beam consisting of elements connected flexibly along their axis is discussed in the paper. An example of a structural system, constructed with the use of different materials is a composite girder consisting of a steel beam connected with a concrete slab. Full interaction of elements connected discontinuously (discretly) along the axis of the beam is a particular (theoretical) case. Taking into account functions of shear forces and stiffness k, a connection, can be classified as rigid when k > 1400 MN/m2. In this case, the results obtained from the classic beam (homogeneous) model are sufficient for design purposes. In the cases presented in the paper, the results obtained using classic model may considerably deviate from the results obtained using layered model, considered to be the accurate one. The examples of analyses given in the paper show the possibility for the use of Fourier series in calculating shear forces in the case of discrete connections. Using this solution, a compatibility of shear forces with values calculated on the basis of design solution was proved to be valid only in the case of full interaction (no shear slip). As the connection flexibility increases, the discrepancy between the functions of shear forces along the length of a girder rises. Regular arrangements of shear connectors were considered in the paper. The function of connection stiffness k(x) can have a significant influence on the distribution of shear force t(x).