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Comparison of stabilizing control structures for dividing wall columns

IFAC-PapersOnLine 2016年第7期49卷 729-734页

作者： Qian, Xing Jia, Shengkun Skogestad, Sigurd Yuan, Xigang Tianjin Trondheim300072 7491 China State Key Laboratory of Chemical Engineering Tianjin University Tianjin300072 China Trondheim7491 Norway

The focus of this paper is to investigate stabilizing control (single-loop PID control) of a dividing wall column (DWC) for separating ethanol, n-propanol and n-butanol at atmospheric pressure. Three control structures are studied: control structure with fixed split ratios (CS1), control structure with an active liquid split (CS2) and control structure with an active vapor split ratio (CS3). The dynamic performances of the three proposed control structures prove that the three control structures are able to handle feed disturbances inserted into DWC. The simple control structure with fixed split ratios (CS1) is more applicable in industry. Considering the vapor split ratio disturbance, CS2 and CS3 are better than CS1. If the feed composition of A rarely changes, CS3 is able to handle the other feed disturbances. This paper proves that the three-product DWC can be controlled with only three temperature controllers. © 2016

关键词： Process control Atmospheric pressure computer control systems computer simulation Distillation columns systems engineering Three term control systems Automatic process control computer aided control system design control structure Dividing wall columns Dynamic performance Feed compositions Process simulators Stabilizing control

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A PROGRAM FOR HANDLING MULTIPLE PHASES OF THE design CYCLE IN-PROCESS control-system design

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ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE 1993年第3期6卷 231-239页

作者： STEVENS, AL GROBBELAAR, GB RIDLEY, JN MACLEOD, IM UNIV WITWATERSRAND JOHANNESBURG 2001 SOUTH AFRICA

An architecture for a computer aided Process Modelling and control system design program is proposed. The program is designed to enable process-control engineers to tackle various phases of the overall process modelling and control system design cycle. Techniques used include cause-effect and structural controllability analyses, qualitative and bond graph modelling, numerical simulation, computer guided specification and control system design. Early implementation results are presented.

关键词： PROCESS control computer aided control system design BOND GRAPH MODELING QUALITATIVE MODELING STRUCTURAL controlLABILITY ANALYSIS

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Trajectory tracking of AGVs by linear parameter-varying control: a case study⁎

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IFAC-PapersOnLine 2018年第26期51卷 43-48页

作者： Jacobs, Laurens De Preter, Andreas Anthonis, Jan Swevers, Jan Pipeleers, Goele MECO Research Team Dept. of Mechanical Engineering KU Leuven Leuven Belgium DMMS lab Flanders Make Leuven Belgium Octinion bvba Leuven Belgium

This paper proposes a linear-parameter varying (LPV) controller design approach for trajectory tracking of an automated guided vehicle (AGV) based on a simple yet nonlinear kinematic model. By linearization of the model about a reference trajectory, an LPV model is readily obtained, which is then augmented with identified linear time-invariant actuator models. An appropriate parameter-dependent controller for the system is designed in an optimal way by specifying the control objectives in terms of H∞ criteria. Its performance is assessed by means of experiments on the considered prototype of an autonomous platform. © 2016

关键词： controllers Automatic guided vehicles computer control systems Feedback control Kinematics Mobile robots Trajectories Automated guided vehicles computer aided control system design Experimental validations Linear parameter varying control Linear time invariant Linear parameter varying controllers Parameter dependent controllers Reference trajectories

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Iterative model-based mixed H₂/H_∞ control design

Iterative model-based mixed H<sub>2</sub>/H<sub>∞</sub> con...

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UKACC International Conference on control 98

作者： Gaspar, P Bokor, J Computer and Automation Research Inst Hungary

ISBN: (纸本)085296708X

This paper proposes an Iterative scheme for mixed H-2/H-infinity control design using an identified model. The purpose of the mixed H-2/H-infinity is to combine the traditional H-2 quadratic performance criterion for disturbance rejection with the H-infinity performance criterion for the maximum robustness against destabilizing uncertainties. In the iterative scheme, once the model is identified for the known controller, once the controller is designed for the identified model. This paper demonstrates this scheme for the active suspension design in which the traditional performance criterion should be extended with H-infinity criterion due to significant uncertainties.

关键词： computer aided control system design multivariable control systems automotive systems

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Home laboratory for control applications 13

Home laboratory for control applications

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13th IFAC Symposium on Advances in control Education (ACE)

作者： Bucher, Roberto Vaghi, Alessandro Bianchi, Mikael Montu, Gianluca Univ Appl Sci Southern Switzerland SUPSI Inst Syst & Appl Elect DTI ISEA CH-6900 Lugano Switzerland

The pandemic period has forced schools to find alternative solutions, particularly to be able to carry out laboratory activities. In addition to the possibility of organizing remote laboratories, in SUPSI we have analyzed the possibility of creating small boards to be made available to students in order to carry out practical activities at home. Therefore, a board was created with 4 simple processes, which however offer the possibility to deepen many topics related to control, with activities ranging from parametric modeling and identification, up to advanced controllers (LQR, MPC, etc.). After the choice of 4 possible control systems, we proceeded to the theoretical description of the processes and the drafting of the first solutions. Copyright (C) 2022 The Authors.

关键词： computer aided control system design Laboratory techniques Laboratory education Education

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Practical experiences with Python and Linux RT at the SUPSI Laboratory 12th

Practical experiences with Python and Linux RT at the SUPSI ...

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12th IFAC Symposium on Advances in control Education (ACE)

作者： Bucher, Roberto Univ Appl Sci Southern Switzerland SUPSI Inst Syst & Appl Elect DTI ISEA CH-6928 Lugano Switzerland

This paper presents a computer aided control system design (CACSD) environment completely based on the programming language Python. Students can perform all the control design tasks (modeling, identification, controller design, simulation) in this environment, and at the end, they can automatically generate RT code for targets like a PC or a Raspberry PI with a Linux RT OS. A Python package for control purposes have been developed at the Caltech by Richard Murray, with the aim of integrating the most used functions and methods available in other commercial and non commercial software. Using this package it is possible to design different kinds of controllers for laboratory plants (PID, state-feedback, LQR, including full and reduced order observers). An additional package developed at SUPSI allows representing the full system in a graphical block diagram, similar to xCos or Simulink, and automatically generating code for RT targets. This application offers the most used blocks required for the design of a control system. New blocks can be easily integrated into this SW. This environment has been validated at the SUPSI laboratory on different electromechanical plants: the classical Inverted Pendulum, the Disks and Spring system, the Ball on Plate and the Ball on Wheel plants. (C) 2019, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： computer aided control system design Laboratory techniques Laboratory education Education

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Advanced Tuning for Ziegler-Nichols Plants

Advanced Tuning for Ziegler-Nichols Plants

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20th World Congress of the International-Federation-of-Automatic-control (IFAC)

作者： Diaz-Rodriguez, Ivan D. Han, Sangjin Keel, L. H. Bhattacharyya, S. P. Texas A&M Univ Dept Elect & Comp Engn College Stn TX 77840 USA Tennessee State Univ Dept Elect & Comp Engn Nashville TN 37209 USA

In this paper, we describe an advanced tuning approach for the design of PI (Proportional-Integral) and PID (Proportional-Integral-Derivative) controllers for the Ziegler-Nichols plants, that is First Oder Plus Time-Delay (FOPTD) continuous-time LTI (Linear Time Invariant) systems. The objective is to provide to the designer an efficient tool to design PI or PID controllers where it is possible to select simultaneous performance specifications of gain margin, phase margin, and gain crossover frequency from a set of achievable performance design curves for Ziegler-Nichols plants. To succeed in this, we first construct the stabilizing set of PI or PID controllers corresponding to the Ziegler-Nichols plant. Next, we generate an achievable performance set displayed as design curves in the gain and phase margin plane, indexed by gain crossover frequencies. Each point in this achievable performance plot represents a prescribed gain margin, phase margin, and crossover frequency, obtained by a PI or PID controller contained in the stabilizing set. Then, by selecting a point from the achievable performance set, a unique PI or PID controller achieving these simultaneous specifications is found from the intersection of an ellipse and straight line parametrized from constant magnitude and constant phase loci in the space of controller gains. We present illustrative examples to validate the proposed approach. (C) 2017, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Linear systems Time-Delay PI/PID controllers Stability limits computer aided control system design

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Real-time Efficient Operation of Decatizing Processes via a Geometric-based Extremism Seeking control 21st

Real-time Efficient Operation of Decatizing Processes via a ...

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21st IFAC World Congress on Automatic control - Meeting Societal Challenges

作者： Ferro, Fabiana Federica Lionello, Michele Rampazzo, Mirco Beghi, Alessandro Guay, Martin Univ Padua Dept Informat Engn Via G Gradenigo 6-B I-35131 Padua Italy Queens Univ Dept Chem Engn Kingston ON K7L 3N6 Canada

Finishing is one of the fundamental steps of textile production and still, nowadays, it largely depends on empirical knowledge. Aim of finishing processes is to impart the required functional properties to the fabric and, in particular, decatizing is the process that lends the fabrics dimensional stability, enhances the luster, and improves the so-called fabric hand, corresponding to the sense of touching a textile. In order to properly treat the textile while minimizing the process energy consumption, suitable decatizing operating conditions, such as air temperature and humidity in the steaming section, have to be set. In this paper, because of the limited knowledge of certain process parameters and the difficulty of developing, implementing, and using effective a-priori process models, the problem of determining the set-points for the main controlled process variables is formulated as a constrained optimization problem and this is faced by means of a model-free approach. More precisely, we consider a constrained Extremum Seeking control (ESC) scheme, using a geometric approach. In this preliminary study, first, we develop a Matlab-based simulation environment for the textile decatizing process and then we exploit it to design and test the ESC scheme. The in silico results confirm the effectiveness of the proposed approach. Copyright (C) 2020 The Authors.

关键词： Textile Processes Modelling and Simulation computer aided control system design Model-free control Extremum Seeking control

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Linear model identification toolbox for dynamic systems

Linear model identification toolbox for dynamic systems

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UKACC International Conference on control 98

作者： Escobet, T Quevedo, J Univ Politecn Catalunya Dept ESAII E-08028 Barcelona Spain

ISBN: (纸本)085296708X

A new methodology for model structure identification is presented. This is implemented as a new toolbox of MATLAB. The methodology developed has two parts, the first one has the objective to find a pure delay using the estimated impulse response, and the second one, uses at same time the minimal value of the identification criteria and the representative value of numerator coefficients. The graphical interface and the results obtained using some real applications are also presented.

关键词： system identification and signal processing computer aided control system design

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Advanced Tuning for Ziegler-Nichols Plants

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IFAC-PapersOnLine 2017年第1期50卷 1805-1810页

作者： Díaz-Rodríguez I.D. Han S. Keel L.H. Bhattacharyya S.P. Department of Electrical and Computer Engineering Texas A&M University College Station TX 77840 United States Department of Electrical and Computer Engineering Tennessee State University Nashville TN 37209 United States

关键词： computer aided control system design Linear systems Stability limits Time-Delay PI/PID controllers

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