title: On the fragility of fractional-order PID controllers for FOPDT processes.
abstract: This paper analyzes the fragility issue of fractional-order proportional-integral-derivative controllers applied to integer first-order plus-dead-time processes. In particular, the effects of the variations of the controller parameters on the achieved control system robustness and performance are investigated. Results show that this kind of controllers is more fragile with respect to the standard proportional-integral-derivative controllers and therefore a significant attention should be paid by the user in their tuning.
authors.affiliation: Dipartimento di Ingegneria dell׳Informazione, University of Brescia - Italy, Italy. Electronic address: fabrizio.padula@unibs.it.
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Padula
authors.affiliation: Dipartimento di Ingegneria Meccanica e Industriale, University of Brescia - Italy, Via Branze 38, I-25123 Brescia, Italy. Electronic address: antonio.visioli@unibs.it.
authors.forename: Antonio
authors.initials: A
authors.lastname: Visioli
keywords: Fractional-order controllers; Fragility; PID control; Tuning