Fuzzy Sliding Mode Control for Aircraft Electrohydraulic Servo Mechanism

摘要

The dynamic responses of a fuzzy sliding-mode controlled aircraft electro-hydraulic servo mechanism are studied. Since the dynamics of the system are highly nonlinear and have large extent of model uncertainties, such as big changes in parameters and external disturbance, first, sliding mode control (SMC) is introduced. Then, to overcome the main problem with SMC, i.e., the chattering phenomenon in the control input, a design method of fuzzy sliding mode control (FSMC) is proposed, in which a fuzzy inference mechanism is utilized to facilitate switching control adjustment. Simulation results show that the proposed FSMC provides high-performance dynamic characteristics and it's robust with regard to plant-parameter variations and external disturbance. Furthermore, comparing with conventional SMC, the chattering phenomenon is reduced by the proposed FSMC.