... with two servo valves. A schematic diagram of the electrohydraulic system is shown in Fig. 11 . This electrohydraulic system is also used as the test bed for several research projects, which are aimed at developing advanced control schemes technologies to cope with such factors as nonlinear friction...

... ) = θ · ( t ) , x 3 ( t ) = P L ( t ) , and x 4 ( t ) = A ( t ) . Then, the electrohydraulic system is described by the following fourth order nonlinear state-space model where the output, y ( t ) , is the angular displacement, 7...