DESIGN OF ADAPTIVE FUZZY-NEURAL PID-LIKE CONTROLLER FOR NONLINEAR MIMO SYSTEMS | ||
| IRAQI JOURNAL OF COMPUTERS, COMMUNICATIONS, CONTROL AND SYSTEMS ENGINEERING | ||
| Article 1, Volume 7, Issue 1, June 2007, Pages 87-96 | ||
| Authors | ||
| Mr. Qussay F. Ad; ; Dr. Mohammed Yousif Hassan | ||
| Abstract | ||
| Abstract: A combination of fuzzy logic and neural network can generate a fuzzy neural controller which in association with a neural network emulator can improve the output response of the controlled system. This combination uses the neural network training ability to adjust the membership functions of a PID like fuzzy neural controller. Such controller can be used to adaptively control nonlinear MIMO systems. The goal of the controller is to force the controlled system to follow a reference model with required transient specifications of minimum overshoot, minimum rise time and minimum steady state error. The fuzzy membership functions were tuned using the propagated error between the plant outputs and the desired ones. To propagate the error from the plant outputs to the controller, a neural network is used as a channel to the error. This neural network uses the back propagation algorithm as a learning technique. The controller was tested using two inputs / two outputs nonlinear time invariant model. Different reference (set-point) inputs were applied to the closed loop system. Also, different values of loads and disturbances were applied to the closed loop system. Simulation results show that the controller achieves the design requirements. | ||
| Keywords | ||
| neural networks; Fuzzy Logic; PID controller; Nonlinear Systems; MIMO systems | ||
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