Proceedings ArticleDOI
Modeling of stable and unstable second order systems with time delay
Bajarangbali,Somanath Majhi +1 more
- pp 1-5
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TLDR
In this article, an estimation of stable and unstable second order plus time delay (SOPDT) process model parameters is proposed by using relay with hysteresis and describing function approximation (DFA) technique.Abstract:
Estimation of stable and unstable second order plus time delay (SOPDT) process model parameters is proposed in this paper by using relay with hysteresis and describing function approximation (DFA) technique. The process models concerned in this paper are assumed to have only real poles. Relay with hysteresis reduces the effect of measurement noise on process model parameters. DFA technique is used to derive mathematical expressions to identify the unknown model parameters. Measurement noise which is an important issue in real time systems, may lead to inaccurate estimation of process model parameters. The effectiveness of the proposed method is studied in the noisy environment. For denoising, Fourier series based curve fitting technique is used. The general usefulness of the proposed method is validated with simulation results.read more
Citations
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Journal ArticleDOI
Identification of process transfer function parameters in event-based PI control loops.
TL;DR: Simulation results demonstrate that the estimations can be as accurate as those obtained with relay identification methods for time-driven control systems based on other approaches (state-space, curve fitting, Laplace transform, etc.).
Journal ArticleDOI
Fractional order proportional derivative control for time delay plant of the second order: The frequency frame
TL;DR: By shaping the curves of the Bode plot, improvements are observed in the performance and robustness of the second order plus time delay system controlled by a fractional order proportional derivative controller.
Journal ArticleDOI
Estimation of First and Second Order Process Model Parameters
R. Bajarangbali,Somanath Majhi +1 more
TL;DR: In this article, explicit expressions are proposed to estimate the unknown process model parameters during online and offline mode of operation, which are generalized for second order overdamped, underdamped, critically damped, first order and unstable systems.
Journal ArticleDOI
Dynamic model identification of a real-time simple level control system
TL;DR: Using a relay feedback approach, mathematical expressions for identification of real-time level control system in transfer function form are proposed in this paper and the accuracy of derived transfer function models is compared with a model derived from ZN method.
Journal ArticleDOI
Closed-loop identification of stable and unstable processes with time-delay
TL;DR: In this article , an improved closed-loop approach is developed to carry out process identification in terms of generalized first and second order plus time-delay (GFOPTD & GSOPTD) process models.
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.
Journal ArticleDOI
Automatic tuning of optimum PID controllers
M. Zhuang,Derek P. Atherton +1 more
TL;DR: In this article, the analytical procedures for obtaining optimum PID controller settings for minimisation of time weighted integral performance criteria are reviewed and two procedures for finding the required controller parameters for optimisation of the integral of time error squared criterion are presented.
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
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.