Journal ArticleDOI
Parameter estimation from relay autotuning with asymmetric limit cycle data
Ibrahim Kaya,Derek P. Atherton +1 more
TLDR
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.About:
This article is published in Journal of Process Control.The article was published on 2001-08-01. It has received 116 citations till now. The article focuses on the topics: Describing function & Closed-loop transfer function.read more
Citations
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Journal ArticleDOI
A tutorial review on process identification from step or relay feedback test
TL;DR: The process models with time delay mainly adopted for identification in the literature are presented with a classification on different response types, along with two specific categories for robust identification against load disturbance and the identification of multivariable or nonlinear processes.
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
IMC based automatic tuning method for PID controllers in a Smith predictor configuration
TL;DR: A new approach is presented based on relay autotuning of a plant to find parameters for its control using a Smith predictor, which has given improved results when compared with some previous approaches.
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.
Journal ArticleDOI
Improved cascade control structure for enhanced performance
TL;DR: In this paper, an improved cascade control structure and controller design based on standard forms is suggested to improve the performance of cascade control in the presence of disturbances, where the corrective action for disturbances does not begin until the controlled variable deviates from the set point.
References
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Journal ArticleDOI
Paper: Automatic tuning of simple regulators with specifications on phase and amplitude margins
Karl Johan Åström,Tore Hägglund +1 more
TL;DR: A simple method for estimating the critical gain and the critical frequency is described, which may be used for automatic tuning of simple regulators as well as initialization of more complicated adaptive regulators.
Book
Multiple-Input Describing Functions and Nonlinear System Design
TL;DR: The theory of automatic control has been advanced in important ways during recent years, particularly with respect to stability and optimal control, but these theories do not, however, lay to rest all questions of importance to the control engineer.
Journal ArticleDOI
Nonlinear Control Engineering-Describing Function Analysis and Design
Derek P. Atherton,D. R. Towill +1 more
Journal ArticleDOI
Derivation of transfer functions for highly nonlinear distillation columns
TL;DR: Mise en place d'une procedure de commande simple which utilise la methode "autotune" d'Astrom for obtenir les gains and les frequences critiques for chaque element diagonal de la matrice des fonctions de transfert as discussed by the authors.
Journal ArticleDOI
An improved autotune identification method
Related Papers (5)
Paper: Automatic tuning of simple regulators with specifications on phase and amplitude margins
Karl Johan Åström,Tore Hägglund +1 more