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270 Emilian Moşneguţu et al. STUDIUL OBŢINERII TRAIECTORIEI UNEI PARTICULE SOLIDE PE O SUPRAFAŢĂ PLANĂ OSCILANTĂ (Rezumat) O parte din produsele din agricultură sau rezultate din diferite procese industriale sunt supuse separării. Cea mai utilizată metodă de separare a unor astfel de produse o reprezintă separarea după dimensiunile particulelor care alcătuiesc amestecul eterogen. Cu toate că procesul de separare după dimensiuni este unul dintre cele mai răspândite, în literatura de specialitate sunt puţine studii care să prezinte modul de determinare a traiectoriei unei particule pe suprafaţa oscilantă a blocului de site. Articolul de faţă prezintă o metodă de determinare a acestei traiectorii, pentru o particulă reală, utilizând o sită oarbă care execută o mişcare oscilantă plană. Pentru determinarea traiectoriei particulei reale s-au utilizat două camere video care au avut drept scop filmarea deplasării particulei solide după planurile XOY şi XOZ. Cu ajutorul soft-ului SynthEyes s-au extras coordonatele punctului urmărit. Datele obţinute au fost prelucrate ţinându-se cont de distanţa de focalizare şi de unghiul de înclinare al suprafeţei plane. Prelucrarea datelor a avut drept scop determinarea traiectoriei reale a particulei şi viteza de deplasare a acesteia.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI LABORATORY STAND FOR THE STUDY OF CUT STRAINS VEGETABLE WITH KNIFE-FINGERS TYPE CUTTING APPARATUS BY GELU NUŢU *1 and IOAN BĂISAN 2 1 APIA Bacău 2 „Gheorghe Asachi” Technical University of Iaşi Received: November 10, 2012 Accepted for publication: November 28, 2012 Abstract. This paper presents the construction of a stand to study plant stems cutting force, cutting apparatus knife-finger type. Stand using a force transducer and a displacement with high sensitivity, which allows to obtain accurate values in real working conditions. Are presented the experimental results for three variants of the knife and three species of cereal grains, the cut stems between nodes and on the node. Key words: laboratory stand, cutting blade, cutting force. 1. Introduction Plant stems cutting operation is particularly important in the mechanical harvesting of plants, in terms of work quality indices and the energy (Neculăiasa 2002). Knife cutting machines, reciprocating finger found in construction combine harvester, a forage harvester and some mowers. Theoretical study of cutting operation with these devices is subject to a number of factors that can not be put into mathematical equations, and therefore the design and execution of their extensive use of experimental data. The force required depends on the shape of plant stems cutting blades, by way of bearing the strain during cutting, the physical and mechanical _______________________________ ∗ Corresponding author: e-mail: ngsax63@yahoo.com
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