Modelling and dynamics of a servo-valve controlled hydraulic motor by bondgraph

A comprehensive model of a closed-loop servo-valve controlled hydro-motor drive system has been made using Bondgraph simulation technique (Thoma, 1990) [17]. The validation of the servo-valve model is obtained first by the established results of Gordic et al., 2004 [10]. The dynamic performance of the complete system has been studied with respect to the variation of the parameters of the PI controller that drives the servo-valve.