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This article presents a scheme for the control of an electro-hydraulic passive force tracking system using the compound controller with an intelligent feed forward compensator (IFFC), which is designed as a test equipment to reproduce on-ground aerodynamics load for reverse thrust system on a certain kind of plain. Through detailed analysis, the mathematical and simulation models are established. Since the conventional proportion integration (PI) method is unsatisfactory due to its bad adaptability to the parametric uncertainties, an IFFC with an off-line self-tuning mechanism is proposed. The related simulations are made and the results show that the compound controller will have good performance after training even though the parameters of the PI part are not optimal. To validate the feasibility of the proposed control strategy, the experiments are carried out on an electro-hydraulic test platform and the experimental results demonstrate the effectiveness of the proposed controller with IFFC for different tracking tasks.

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This paper presents a novel adaptive composite fuzzy dynamic surface controller for a variable-supply-pressure electro-hydraulic-system in the presence of unknown nonlinear friction effects. To avoid analytic calculation, command filters are utilized to produce certain virtual controllers and their derivatives. A fuzzy logic system is designed to approximate and compensate the unknown nonlinear friction influences of the electro-hydraulic-system. To achieve a precise approximation, the prediction error of a designed serial-parallel estimation model and the compensated tracking error are both used to develop the composite adaptive law. Comparative simulation and experimental results are obtained to verify the effectiveness of the proposed control method.

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