Maher H. Al-Sereihy, Ibrahim M. Mehedi, Ubaid M. Al-Saggaf, and Maamar Bettayeb
State-feedback control, fractional-order controller, fractional-order approximation, rotary flexible joint
In recent years, fractional-order controllers have been used more extensively in applied research and industrial applications. In this article, a state-feedback-based fractional integral control scheme is proposed and implemented in a rotary flexible joint system. For this modified state-feedback control approach, two different approximation methods are used: CRONE (Commande Robuste d’Ordre Non Entier, meaning noninteger-order robust control), developed by A. Oustaloup, and the FOMCON (fractional-order modelling and control) MATLAB toolbox. For comparison, pure state-feedback control and the modified technique are both implemented for a simulation and an experiment involving a rotary flexible joint system. The tracking performance of the rotary arm and the degree to which the tip vibration is minimized are evaluated and compared between the pure state-feedback control scheme and the modified state-feedback-based fractional integral control scheme.
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