title: On-line identification of cascade control systems based on half limit cycle data.
abstract: An on-line identification procedure is presented for cascade control systems in which both inner and outer loop process dynamics are modelled simultaneously by performing a single experiment. Departing from the conventional relay autotuning method where the controller is replaced by a relay, the proposed method is carried out on-line without breaking the closed-loop control. Exact analytical expressions are derived for process model parameters in terms of a few critical parameters of half period data of limit cycle output. Simulation examples are included to demonstrate the effectiveness of the proposed method.
authors.affiliation: Indian Institute of Technology Guwahati, Guwahati-781039, India. utkal@iitg.ernet.in
authors.forename: Utkal
authors.initials: U
authors.lastname: Mehta
authors.forename: Somanath
authors.initials: S
authors.lastname: Majhi
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D005246:Feedback; D008962:Models, Theoretical; D012815:Signal Processing, Computer-Assisted