The Research Of Iterative Learning Control Based On The Liding Mode Variable Structure Control

Iterative learning control is the use of "repeated learning "learning strategy, ithas a correction mechanism of the memory system and experience. It is based on thedeviation between the actual output and desired output of the control system tocorrect the control signal, thereby improving the tracking performance of the controlsystem.External parameters in the traditional iterative learning control algorithmiterative learning algorithm convergence and convergence rate is very large, whichgives rise to the idea of optimization theory to design iterative learning control law.Iterative learning control algorithm for the continuous system to establish astructured iterative learning control algorithm based on fuzzy sliding modeequivalent control variable in order to reduce external disturbances and parameterperturbations.The algorithm sliding mode controller for the introduction of iterativelearning control algorithm for the weakening of external disturbance and parameterperturbations affect the accuracy of the algorithm, and then fuzzy control and slidingmode variable structure control the combination of fuzzy control soften the controlsignal to reduce or avoid the chattering of traditional sliding modecontrol.Equivalent control-based sliding mode controller, the control law is usuallycomposed by the equivalent control and switching control, the equivalent controlsystem state remains in the sliding surface, switching control to force the systemstate in the sliding surface sliding.The use of fuzzy rules can be established based onthe equivalent control of fuzzy sliding mode controller, thus eliminating chattering.Finally, the paper-based fuzzy sliding mode control iterative learning controlalgorithm analysis, comparative analysis of obtained fuzzy sliding mode iterativelearning control algorithm can effectively reduce the external disturbances andparameter perturbations on the control algorithm, but also has better convergenceresults.Fuzzy sliding mode iterative learning control algorithm has good applicationprospects in practical applications.