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PID controller Tuning for a Multivariable Glass Furnace Process by Genetic Algorithm

International Journal of Automation and computing 2016年第1期13卷 64-72页

作者： Kumaran Rajarathinam James Barry Gomm Ding-Li Yu Ahmed Saad Abdelhadi Mechanical Engineering and Materials Research Centre Control Systems Group School of EngineeringLiverpool John Moores University

Standard genetic algorithms （SGAs） are investigated to optimise discrete-time proportional-integral-derivative （PID） con- troller parameters, by three tuning approaches, for a multivariable glass furnace process with loop interaction. Initially, standard genetic algorithms （SGAs） are used to identify control oriented models of the plant which are subsequently used for controller optimisa- tion. An individual tuning approach without loop interaction is considered first to categorise the genetic operators, cost functions and improve searching boundaries to attain the desired performance criteria. The second tuning approach considers controller parameters optimisation with loop interaction and individual cost functions. While, the third tuning approach utilises a modified cost function which includes the total effect of both controlled variables, glass temperature and excess oxygen. This modified cost function is shown to exhibit improved control robustness and disturbance rejection under loop interaction.

关键词： Genetic algorithms control optimisation decentralised control proportional-integral-derivative （PID） control modifiedcost function multivariable process loop interaction.

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A MULTIPHASE SERIES-RESONANT CONVERTER WITH A NEW TOPOLOGY AND A REDUCED NUMBER OF THYRISTORS

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IEEE TRANSACTIONS ON POWER ELECTRONICS 1995年第1期10卷 86-93页

作者： HUISMAN, H Systems and Control Group Department of Mechanical Engineering and Marine Technology Delft University of Technnology Delft Netherlands

Multiphase series-resonant (SR) power converters provide a flexible way to transform power between a utility grid and a multiphase load or source. The current implementations all suffer from a high component count, which makes the use of these converters unattractive from an economical point of view. A new topology for multiphase SR converters has been proposed in the literature in a simulation context. This topology uses half the number of power semiconductors compared to the existing multiphase SR converters. The present paper addresses the implementation of the new topology in a prototype converter. The old and new topologies are presented. The operation of the new topology is explained. In the new topology the resonant circuit is grounded at one side, which compared to the old topology imposes a restriction on the operation. The paper shows both simulation data and measured waveforms. It is explained that the economical gain due to the reduction in component count is offset by a lower power rating. The paper finishes with conclusions and acknowledgments.

关键词： POWER ELECTRONICS control systems INVERTORS SERIES RESONANT CONVERTERS 3-PHASE AC-TO-AC POWER CONVERTER REVERSIBLE POWER FLOW THYRISTORS REACTIVE POWER GENERATION

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Mixed H-2/H infinity control for time-varying and linear parametrically-varying systems

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INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR control 1996年第9-10期6卷 929-952页

作者： Scherer, CW Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

This paper provides a solution of the mixed H-2/H-infinity problem with reduced order controller for time-varying systems in terms of solvability of differential linear matrix inequalities and rank conditions, including a derailed discussion of how to construct a controller. Immediate specialization leads to a solution of the full order problem and the mixed H-2/H-infinity problem for linear systems whose description depends on an unknown but, in real-time, measurable time-varying parameter. As known for the H-infinity problem, we completely resolve the quadratic mixed H-2/H-infinity problem (under certain hypotheses on the parameter dependence) by reducing it to the solution of finitely many algebraic linear matrix inequalities. However, we also point out directions of how to overcome the conservatism introduced by using constant solutions of the differential inequalities. Finally, we clarify that a simple specialization leads to a linear matrix inequality approach to the pure H-2 problem for general LTI systems, and we reveal how to compute the optimal value.

关键词： mixed H-2/H infinity control linear time-varying systems linear parametrically-varying systems linear matrix inequalities

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DESIGN AND EXPERIMENTAL EVALUATION OF STABILIZING FEEDBACK controlLERS FOR CONTINUOUS CRYSTALLIZERS

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POWDER TECHNOLOGY 1995年第1期82卷 21-35页

作者： EEK, RA POUW, HAA BOSGRA, OH Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft Netherlands

The development and experimental evaluation of stabilizing control schemes for a continuous isothermal evaporative pilot crystallizer, equipped with on-line crystal size distribution (CSD) sensors and a system for fines removal, are discussed. A first-principles modeling procedure is followed to derive models for the crystallizer and the CSD sensors. An output error optimization procedure is applied to estimate unknown empirical parameters of the process model with experimental process data. The experimental results reveal a strong influence of the fines removal rate on CSD dynamics. Two stabilizing control schemes are presented. The first is a simple proportional output feedback scheme which uses information on the number of fines to manipulate the fines removal rate. Experimental results indicate that sufficient stability and dampening can be achieved with this controller. The second scheme is an observer-based control scheme in which information on the actual process state is used to stabilize the CSD by manipulating the fines removal rate. Simulation results demonstrate that this state feedback approach exposes better performance compared to the output feedback approach.

关键词： PROCESS control FEEDBACK controlLERS CRYSTALLIZERS SENSORS

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MODEL SETS AND PARAMETRIZATIONS FOR IDENTIFICATION OF MULTIVARIABLE EQUATION ERROR MODELS

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AUTOMATICA 1994年第3期30卷 433-446页

作者： VANDENHOF, PMJ [&dagger ]Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

Equation error (or linear regression) models are known to inherently require the a priori choice for specific signal variables to be considered as regressand and/or regressor. This implies that a model set should be-a priori-restricted in some way in order to define an acceptable identification problem. In the case of approximate identification (i.e. the system to be modelled is not contained in the model set), this restriction acts as a design variable, with the identified models being dependent on its specific choice. In this paper the necessity of this restriction is quantified by the property of discriminability, i.e. the ability of an identification criterion to distinguish between all the different models in a model set. Employing a deterministic, signal-oriented framework, several sets of sufficient conditions are derived for model sets to be discriminable by a least squares identification criterion. To this end use is made of polynomial model representations in two shift operators. Although it is of a different nature, the problem discussed is shown to be closely related to the problem of constructing identifiable parametrizations for sets of rational transfer functions. It is shown that the pseudo-canonical or overlapping parametrizatian of all transfer functions with fixed McMillan degree constitutes a nonoverlapping set of equation error models that is discriminable by a least squares identification criterion.

关键词： SYSTEM IDENTIFICATION IDENTIFIABILITY CANONICAL FORMS LEAST SQUARES EQUATION ERROR MODELS LINEAR REGRESSION PARAMETRIZATION

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INNER-LOOP DESIGN AND ANALYSIS FOR HYDRAULIC ACTUATORS, WITH AN APPLICATION TO IMPEDANCE control

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control engineering PRACTICE 1995年第9期3卷 1323-1330页

作者： HEINTZE, J VANDERWEIDEN, AJJ Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

The behaviour of manipulators equipped with hydraulic actuators is dominated by the dynamics of the hydraulics. The aim of an inner/outer-loop control structure is to mask these hydraulic dynamics with an inner-loop. Constructing the inner-loop by using the inverse of the actuator dynamics, or by placing the poles of the actuator system, is fundamentally different. An analysis of these two options concludes that a pole placement is the best choice. First results of an actual implementation of a proposed method on an industrial hydraulic drive system shows the practical relevance of this controller.

关键词： HYDRAULIC SERVO ACTUATORS CASCADE DELTA-P control THEORETICAL ANALYSIS IMPEDANCE control EXPERIMENTAL APPLICATION

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APPROXIMATE IDENTIFICATION WITH CLOSED-LOOP PERFORMANCE CRITERION AND APPLICATION TO LQG FEEDBACK DESIGN

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AUTOMATICA 1994年第4期30卷 679-690页

作者： HAKVOORT, RG SCHRAMA, RJP VANDENHOF, PMJ [a]Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands

A model-based controller generally works better with the model than with the modelled plant due to the modelling error. This difference between the performances can be made small by selecting a model that is accurate at the closed-loop relevant frequencies. In this paper it is shown that an iterative approach of identification and control design can lead to a model that is much better suited for feedback design than a model resulting from an unweighted open-loop identification. In this iteration each identification is performed such that a certain closed-loop criterion function is minimized. This is accomplished by closed-loop identification with persistent set-point excitation and a proper signal filtering Each control design step employs the latest identified model to construct an LOG compensator. The performance requirements are gradually increased during the iteration.

关键词： SYSTEM IDENTIFICATION CLOSED-LOOP systems FEEDBACK control control SYSTEM DESIGN ITERATIVE METHODS

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Reverse aperiodic resonance in low- to high-dimensional bistable systems: A complement to stochastic resonance studies in logic circuits

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Communications in Nonlinear Science and Numerical Simulation 2025年 149卷

作者： Shen, Mengen Yang, Jianhua Sanjuán, MiguelA.F. Chen, Huatao Wang, Zhongqiu Jiangsu Key Laboratory of Mine Mechanical and Electrical Equipment School of Mechanical and Electrical Engineering China University of Mining and Technology Jiangsu Xuzhou221116 China Nonlinear Dynamics Chaos and Complex Systems Group Departamento de Física Universidad Rey Juan Carlos Tulipán s/n Madrid Móstoles28933 Spain Division of Dynamics and Control School of Mathematics and Statistics Shandong University of Technology Zibo255000 China School of Computer Science and Technology China University of Mining and Technology Jiangsu Xuzhou221116 China

As circuits continue to shrink in size, noise has emerged as a critical challenge in achieving optimal performance. Stochastic resonance in logic circuits offers an innovative approach to harness noise constructively;however, current implementations are limited to basic logical functions such as OR, AND, NOR, and NAND, restricting broader applications. This paper introduces a three-dimensional (3D) coupling model to investigate the counterintuitive phenomena that arise in nonlinear systems under noise. Compared to the one-dimensional Langevin equation and the two-dimensional Duffing equation, the 3D coupling model features more adjustable parameters and coupling interactions, enhancing the system's dynamic behavior. The study demonstrates that increasing noise intensity triggers reverse aperiodic resonance, leading to signal phase reversal and amplitude amplification. This phenomenon is attributed to the motion of Brownian particles in a bistable potential well. Additionally, reverse aperiodic resonance addresses the lack of logical negation in traditional stochastic resonance systems by introducing noise-driven phase reversal, providing a novel alternative to conventional inverters. © 2025 Elsevier B.V.

关键词： Sequential circuits

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Feedback Optimization with State Constraints through control Barrier Functions

arXiv

引用

arXiv 2025年

作者： Delimpaltadakis, Giannis Mestres, Pol Cortés, Jorge Heemels, W.P.M.H. Control Systems Technology group Eindhoven University of Technology Netherlands Department of Mechanical and Aerospace Engineering University of California San Diego United States

Recently, there has been a surge of research on a class of methods called feedback optimization. These are methods to steer the state of a control system to an equilibrium that arises as the solution of an optimization problem. Despite the growing literature on the topic, the important problem of enforcing state constraints at all times remains unaddressed. In this work, we present the first feedback-optimization method that enforces state constraints. The method combines a class of dynamics called safe gradient flows with high-order control barrier functions. We provide a number of results on our proposed controller, including well-posedness guarantees, anytime constraint-satisfaction guarantees, equivalence between the closed-loop’s equilibria and the optimization problem’s critical points, and local asymptotic stability of optima. Copyright © 2025, The Authors. All rights reserved.

关键词： Feedback control

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A FINITE-ELEMENT MUSCULOSKELETAL MODEL OF THE SHOULDER MECHANISM

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JOURNAL OF BIOMECHANICS 1994年第5期27卷 551-569页

作者： VANDERHELM, FCT Man-Machine Systems Group Laboratory for Measurement and Control Department of Mechanical Engineering Delft University of Technology Delft The Netherlands

The finite element method described in this study provides an easy method to simulate the kinetics of multibody mechanisms. It is used in order to develop a musculoskeletal model of the shoulder mechanism. Each relevant morphological structure has been represented by an appropriate element. For the shoulder mechanism two special-purpose elements have been developed: a SURFACE element representing the scapulothoracic gliding plane and a CURVED-TRUSS element to represent muscles which are wrapped around bony contours. The model contains four bones, three joints, three extracapsular ligaments, the scapulothoracic gliding plane and 20 muscles and muscle parts. In the model, input variables are the positions of the shoulder girdle and humerus and the external load on the humerus. Output variables are muscle forces subject to an optimization procedure in which the mechanical stability of the glenohumeral joint is one of the constraints. Four different optimization criteria are compared. For 12 muscles, surface EMG is used to verify the model. Since the optimum muscle length and force-length relationship are unknown, and since maximal EMG amplitude is length dependent, verification is only possible in a qualitative sense. Nevertheless, it is concluded that a detailed model of the shoulder mechanism has been developed which provides good insight into the function of morphological structures.

关键词： Musculoskeletal system

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