Journal ArticleDOI
Derivation of transfer function from relay feedback systems
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This article is published in Industrial & Engineering Chemistry Research.The article was published on 1992-03-01. It has received 79 citations till now. The article focuses on the topics: Relay & Transfer function.read more
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Journal ArticleDOI
Relay Feedback Auto-tuning of Process Controllers – A Tutorial Review
TL;DR: The PID relay auto-tuner of Astrom-Hagglund is one of the simplest and most robust autotuning techniques for process controllers and has been successfully applied to industry for more than 15 years.
Journal ArticleDOI
Use of biased-relay feedback for system identification
TL;DR: In this article, the authors devise a relay feedback experiment that can identify two points on the Nyquist curve from a single test at the frequencies ω = 0 and ω=ω u.
Journal ArticleDOI
Obtaining Controller Parameters for a New PI-PD Smith Predictor Using Autotuning
TL;DR: In this paper, a modified PI-PD Smith predictor is proposed to improve the control of processes with large time constants or an integrator or unstable plant transfer functions plus long dead-time for reference inputs and disturbance rejections.
Journal ArticleDOI
Parameter estimation from relay autotuning with asymmetric limit cycle data
Ibrahim Kaya,Derek P. Atherton +1 more
TL;DR: The parameters of first and second order plant transfer functions, stable or unstable, with time delay can be found exactly, assuming no measurement errors, from measurements of the parameters of a single asymmetrical limit cycle in a relay controlled feedback loop.
Journal ArticleDOI
Improved Autotuning Using the Shape Factor from Relay Feedback
T. Thyagarajan,Cheng-Ching Yu +1 more
TL;DR: Simulation results clearly indicate that, by incorporating the shape information, improved autotuning can be achieved in a straightforward manner, and possible dead-time compensation and higher-order compensation can also be devised when necessary.