Fractional vs. Ordinary Control Systems: What Does the Fractional Derivative Provide?

The concept of a fractional derivative is not at all intuitive, starting with not having a clear geometrical interpretation. Many different definitions have appeared, to the point that the need for order has arisen in the field. The diversity of potential applications is even more overwhelming. When...

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Bibliographic Details
Published in:Mathematics (Basel) 2022-08, Vol.10 (15), p.2719
Main Authors: Conejero, J. Alberto, Franceschi, Jonathan, Picó-Marco, Enric
Format: Article
Language:English
Subjects:
Approximation
complex systems
Control theory
Controllers
fractional systems
fractional-order model
identification for control process
Modelling
non-linear systems
Nonlinear phenomena
Operators (mathematics)
structural properties
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Summary:The concept of a fractional derivative is not at all intuitive, starting with not having a clear geometrical interpretation. Many different definitions have appeared, to the point that the need for order has arisen in the field. The diversity of potential applications is even more overwhelming. When modeling a problem, one must think carefully about what the introduction of fractional derivatives in the model can provide that was not already adequately covered by classical models with integer derivatives. In this work, we present some examples from control theory where we insist on the importance of the non-local character of fractional operators and their suitability for modeling non-local phenomena either in space (action at a distance) or time (memory effects). In contrast, when we encounter completely different nonlinear phenomena, the introduction of fractional derivatives does not provide better results or further insight. Of course, both phenomena can coexist and interact, as in the case of hysteresis, and then we would be dealing with fractional nonlinear models.
ISSN:2227-7390
2227-7390
DOI:10.3390/math10152719