ABSTRACT
As a result of this investigation, the following insight has been gained into some prospective adaptive algorithms for a MIMO electrohydraulic servosystem: 1) Adaptive control techniques can improve the system performance through the introduction of adjustable parameters of the controller so as to compensate for varying process dynamics due to changes of the external loads and disturbances. 2) The proposed adaptive algorithm generates the control signals directly from the system inputoutput information which is easy to obtain in most electrohydraulic systems. 3) By using the reference model state, this approach requires less knowledge about the process dynamics. 4) The system dynamics are inherently highly nonlinear. The linearization will, in some cases, cause a considerable error in the description of system dynamics. A nonlinear algorithm should be introduced to improve the control system performance. Further investigation is recommended in this area.
