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160 Doru Calarasu et al. considerată limită pentru siguranţa turbinei. Această soluţie întruneşte caracteristicile solicitate sistemului: este fiabil, nu conţine elemente de acţionare electrică, nu conţine electronică înglobată, nu presupune existenţa unei transmisii hidraulice. Pentru viteze ale vântului mai mici de o limită maximă impusă, ansamblul rotor nu basculează. Elicea se roteşte cu o viteză unghiulară care depinde de viteza vântului şi de încărcarea mecanică la ieşire. Pentru viteze mai mari sau egale cu cea maximă impusă, ansamblul rotor basculează iar elicea îşi modifică planul de rotaţie. Testarea prin simulări numerice a modelului conceptual de mecanism mecanohidraulic protecţie a TEAO de mică putere prin basculare în plan vertical s-a efectuat utilizând mediul de programare Matlab-Simulink. Din analiza răspunsurilor sistemului rezultă performanţe dinamice bune pentru soluţia basculării în plan vertical utilizată în scopul protecţiei turbinelor eoliene cu ax orizontal de mică putere.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi” din Iaşi Tomul LVI (LX), Fasc. 2, 2010 Secţia CONSTRUCŢII DE MAŞINI RESEARCH ON HYDRAULICALLY SYSTEMS WHICH MOVE HEAVY MASSES ON SMALL DISTANCES WITH LOWER FREQUENCIES BY CONSTANTIN CHIRIȚĂ, ADRIAN HANGANU and DANIEL CALFA Abstract. In this paper the authors try to present the mathematical models, static and dynamic, useful for designing of hydraulically systems which move heavy masses on small distances with lover frequencies. In the last time mathematical modeling represents an obligatory step in the designing process of the new products. In this paper are presented the results of the theoretical simulation in concordance with the experimental results. The aim is to show the realistic part of the theoretical simulation of one system designed to move a heavy owen, 200 t, on a short distances, 50 mm, with low frequency, one complete cycle in 24 hours. Key words: research, modeling, simulation, data acquisition. 1. Introduction To move heavy masses on small distances with lover frequencies the author recommends one of the following hydraulic charts, see Fig. 1. In both variants the working tool is the linear hydraulic engine CH, with the active surface S and volume Vo, which moves the mass M. For the first variant the step of the move is programmed at the level of the pump, through the volume/course V. We will admit that for a complete course the pump send to the hydraulic engine the oil volume V. The oil rich the pump through the orifices A and B. In the case of the second variant the flow regulator RD controlled the oil flow, independent to the working pressure for a specific time, when the distributing valve is on. The quantity of oil which enters in to the linear hydraulic engine is controlled in the time by the time stepping system C (t).
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