velocity control of electro hydraulic servo system by tracking method

this paper proposes an efficient tracking method for velocity control of an electro-hydraulic servo system (ehss) in the presence of flow nonlinearities and internal friction. the tracking method controller is a kind of feedback error learning structure. in the proposed method, the feedback error learning (fel) algorithm is used to control the velocity. there is no need to compute the system jacobian in fel method which in turn makes its using more suitable for practical scenarios. this procedure illustrates that ehss control can be successfully. all derived results are validated by computer simulation of a nonlinear mathematical model of the system.