Robust Fuzzy Logic Controller Research Articles

Component Oriented Modelling and Design of Fuzzy Control Scheme for a Class of Pneumatic Actuators

A class of programmable pneumatic axes has been constructed from a series of 3/2 way on-off solenoid valves and standard commercial components. To compensate for the deficiencies of the stock items, afuzzy logic control scheme has been designed based on a component oriented modelling approach by which the physical system was logically decomposed into components. The basic proportional-derivative control algorithm was then extended with three fuzzy logic control algorithms by considering the effects of individual components on the accuracy of the servomechanism. Tests were performed on two different pneumatic axes. The test results showed that the axes were stable dynamically in all test conditions and could achieve the desired positions accurately. It was concluded that the component oriented modelling methodology provided a robust fuzzy logic control scheme which could be applied to both axes and achieved the same high degree of accuracy even without adjustment to its parameters.