Network based type-2 fuzzy logic controller design for hydraulic system

In this study, an adaptive network based type-2 fuzzy logic (ANT2FL) controller is designed for position control of an electro hydraulic servo system. MATLAB/SIMULINK toolbox is used for mathematical modelling of the system and controller design. As a first step, mathematical models of the servo valve, hydraulic cylinder, and hydraulic power unit which are main parts of the system are obtained. In this model, compression capability of the hydraulic fluid, friction and inertia are taken into consideration. The sensitivity, dependability and stability of the controller is taking in to account for a reference trajectory. ANT2FL control structure is preferred because of complexity of the dynamic system behaviours and variability of the electro hydraulic servo system characteristics with time and it is built by using the feedback of the position error and derivative of the position error. Finally, simulation results are evaluated for different type square and sinus reference input signals. Results demonstrate the remarkable performance of ANT2FL.