Simulation of response in dynamic load of hydraulic actuator systems with cartridges logic elements - Axinti, Adrian; Axinti, Gavril (Analele Universităţii "Dunărea de Jos" din Galaţi. Fascicula XIV, Inginerie mecanică = Annals of “Dunarea de Jos“ University of Galati. Fascicle XIV, Mechanical Engineering, 2012)