Stabilizing relay experiment for modeling of unstable processes with large time delay. (July 2014)

• Record Type: Journal Article
• Authors: Mehta, Utkal
• Is Part Of: Proceedings of the Institution of Mechanical Engineers. Volume 228:Number 6(2014)
• Page Start: 359
• Page End: 368
• Publication Date: 2014-07
• Subjects: Unstable process -- relay feedback -- limit cycle; Mechanical engineering -- Periodicals; Automatic control -- Periodicals; Systems engineering -- Periodicals; 621.3
• DOI: 10.1177/0959651814524949
• Languages: English
• ISSNs: 0959-6518

Abstract

Relay experiment can be used to identify exact model parameters of an unstable first-order plus dead time transfer function when a limit cycle exists. This article deals with unstable processes with large time delay where the relay test is not applicable. For these processes, the conventional relay method does not induce a stable limit cycle at the output. A method to overcome the problems with inducing a sustained limit cycle output is discussed by deriving a suitable stabilizer for a feedback control. Then, a non-iterative estimation technique is given to identify the unknown parameters of a first-order mathematical model.