Gain scheduling linear model of an electro-hydraulic actuator

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In different industrial processes in which position and force control are desired,electro-hydraulic systems have a widespread area of utilization. Models of electrohydraulicsystems include high order nonlinearity. In this study, a gain schedulinglinear model corresponded with nonlinear model of a hydraulic force actuatorsystem is developed. The proposed model is constituted in two distinct andconsecutive stages. In the first step, nonlinear terms caused to nonlinearity aredescribed by the means of measurable or observable system parameters andembedded in a nonlinear scheduling parameter. Thus, the scheduling parameter iscontinuously extracted from main system. In the second step, the nonlinear systemequation is rearranged by the scheduling parameter and by this way parametervarying linear model is obtained. The simulations which are performed by use ofMatlab-Simulink computer program show that the proposed model rightly fits tothe nonlinear system model.

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