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Applied Set-Valued Analysis and Optimization 2024年第2期6卷 113-135页

作者： Sadeghi, Hamed Banert, Sebastian Giselsson, Pontus Department of Automatic Control Lund University Lund Sweden

We propose and study a weakly convergent variant of the forward-backward algorithm for solving structured monotone inclusion problems. Our algorithm features a per-iteration deviation vector, providing additional degrees of freedom. The only requirement on the deviation vector to guarantee convergence is that its norm is bounded by a quantity that can be computed online. This approach offers great flexibility and paves the way for the design of new forward-backward-based algorithms, while still retaining global convergence guarantees. These guarantees include linear convergence under a metric subregularity assumption. Choosing suitable monotone operators enables the incorporation of deviations into other algorithms, such as the Chambolle-Pock method and Krasnosel'skii-Mann iterations. We propose a novel inertial primal-dual algorithm by selecting the deviations along a momentum direction and deciding their size by using the norm condition. Numerical experiments validate our convergence claims and demonstrate that even this simple choice of a deviation vector can enhance the performance compared to, for instance, the standard Chambolle-Pock algorithm. Copy: 2024 Applied Set-Valued Analysis and Optimization. © 2024 Biemdas Academic Publishers. All rights reserved.

关键词： Iterative methods

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Discrimination of Stator Asymmetries and Magnetic Saturation in Self-Excited Induction Generators

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Russian Electrical Engineering 2024年第5期95卷 417-424页

作者： Kouchih, D. Hachelaf, R. Automatic and Electrotechnic Department University Blida 1 Blida Algeria Automatic Control Department National Polytechnic School Algeria Algeria

Abstract: This work involves an efficient approach for the modeling and discrimination of the stator asymmetries and magnetic saturation in the self-excited induction generators. For this purpose, an improved model considering magnetic saturation has been developed for the self-excited induction generators operating under asymmetrical load conditions. Magnetic saturation must be considered for the modeling and analysis of the self-excited induction generators. This is because linear modeling with fixed parameters never makes it possible to analyze the performances of such machines. Due to fact that the magnetic saturation and stator asymmetries both cases generate similar harmonic components through the stator voltages and currents, we have to elaborate an improved model to evaluate the electromagnetic performances and to clearly discriminate the stator asymmetries and magnetic saturation. The contribution of this work is that a state model has been developed considering the increase of the common point voltage during asymmetrical conditions and the derivation of the machine inductances due to magnetic saturation. Various electromagnetic characteristics have been extracted such as stator voltages, currents and common point voltage. It will be deduced that the common point voltage can be considered as an interesting signal for the discrimination of the stator asymmetries and magnetic saturation. The concordance between simulation and experimental results shows the consistency of this approach for the modeling and discrimination of the stator asymmetries and magnetic saturation in the self-excited induction generators. © Allerton Press, Inc. 2024. ISSN 1068-3712, Russian Electrical Engineering, 2024, Vol. 95, No. 5, pp. 417–424. Allerton Press, Inc., 2024.

关键词： Saturation magnetization

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Closed-Loop Design for Scalable Performance of Vehicular Formations

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IEEE Transactions on control of Network Systems 2025年第2期12卷 1577-1586页

作者： Hansson, Jonas Tegling, Emma Lund University Department of Automatic Control ELLIIT Strategic Research Area Lund22100 Sweden

This paper presents a novel control design for vehicular formations as an alternative to alignment through conventional consensus protocols for second-order systems. The design is motivated by the closed-loop system, which we construct as first-order systems connected in series, and is therefore called serial consensus. The serial consensus design will guarantee the stability of the closed-loop system under the minimum requirement of the underlying communication graph containing a directed spanning tree - which is not generally true for conventional consensus. As our main result, we show that the serial consensus design gives bounds on the worst-case transient behavior of the formation, which is independent of the number of vehicles and the underlying graph structure. In particular, this shows that the serial consensus design guarantees string stability of the formation and is, therefore, suitable for directed formations and communication topologies. We show that serial consensus can be implemented through message passing or measurements to neighbors at most two hops away. We illustrate our results through numerical examples. © 2014 IEEE.

关键词： Laplace equation

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DESIGNING A FUZZY controlLER FOR THE AUTOMATION OF AN IRRIGATION SYSTEM

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical Engineering and Computer Science 2023年第1期85卷 65-76页

作者： Bostan, Alexandra Dobrescu, Radu Hossu, Daniela Hossu, Andrei Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Automatic Control and Industrial Informatics Department University POLITEHNICA of Bucharest Romania

The paper presents a solution for an irrigation controller based on the fuzzy-logic methodology. First, it describes the general problem of irrigation. Then, it discusses the physical control model. The precious irrigation is great significance for arid and semiarid area. In this paper, a fuzzy control algorithm was proposed to make an optimal irrigation strategy based on the actual measured soil humidity. In this paper, the fuzzy control algorithm was introduced in detail which included the setting of input and output, the selection of membership function and the setting of fuzzy rules. Following the discussion and the formal presentation of the fuzzy controller, the paper provide examples that will show the simplicity in designing and constructing such a system and other advantages of using fuzzy logic in the feedback control problem. © 2023, Politechnica University of Bucharest. All rights reserved.

关键词： Irrigation

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A NOTE ON THE QUALITATIVE BEHAVIOUR OF AN ODE MODEL RELATED TO ENDOTOXIN TOLERANCE

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2024年第4期86卷 127-130页

作者： Olteanu, Mircea Ştefan, Radu Department of Mathematical Methods and Models Faculty of Applied Sciences University "Politehnica" of Bucharest Romania Department of Automatic Control and Systems Engineering Faculty of Automatic Control and Computer Science University "Politehnica" of Bucharest Romania

关键词： Differential equations

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Adaptive Neural Network Identification for Robust Multivariable Systems

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IAENG International Journal of Applied Mathematics 2024年第1期54卷 68-76页

作者： Osorio-Arteaga, Felipe Giraldo, Eduardo Department of Electrical Technology Universidad Tecnológica de Pereira Research Group in Automatic Control Pereira Colombia Department of Electrical Engineering Universidad Tecnológica de Pereira Research group in Automatic Control Pereira Colombia

This paper proposes a robust identification and control-based on a neural network method for a Twin Rotor Multivariable System (TRMS) using a recursive adaptive training algorithm. The algorithm is based on a recursive least squares approach with an additional steepest descent stage. An Adaline neural network is used for modeling the system, and a robust structure is selected based on a linear auto-regressive structure with exogenous inputs (ARX) related to the estimation error. The identification is performed online and the system is controlled under a polynomial structure by pole placement with a dead-beat strategy. The method is evaluated in terms of estimation and tracking error in the presence of external additive disturbances, parametric disturbances, and sinusoidal reference signals. The Root-Mean Square Error (RMSE) is used to evaluate the estimation performance and the Integral-Time Absolute Error (ITAE) is used to evaluate the tracking performance. As a result, a novel robust controller based on a neural network is designed where the best results are obtained for a training recursive least squares algorithm with an additional steepest descent stage. © 2024, International Association of Engineers. All rights reserved.

关键词： Multivariable systems

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Electromagnetic Effects of Short-Circuit Faults in Induction Machines

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Russian Electrical Engineering 2023年第6期94卷 442-447页

作者： Hachelaf, R. Kouchih, D. Tadjine, M. Boucherit, M.S. Automatic Control Department National Polytechnic School Alger Algeria Automatic and Electrotechnic Department University Saad Dahlab Blida Algeria

Abstract: This work describes an efficient approach for the modeling and analysis of asymmetrical induction machines operation under stator short-circuits faults. Theoretical and experimental studies have been investigated for extracting signatures on the line currents, electromagnetic torque, decrease and mechanical speed. The novelty of this approach is that the increase of the machine neutral point voltage during faulty conditions is considered by using line to line voltages as inputs in the state model. Different phenomenons such as magnetic saturation, slotting and skin effects can be considered by an appropriate calculation of machine inductances. This model is less complicated to be implemented for condition monitoring or to validate fault tolerant control algorithms. Experimental study is investigated for the analysis of stator currents and flux density. For this purpose, two flux sensors are placed in the stator periphery according to stationary axes α–β. Simulation and experimental results show the efficiency of this approach in comparison with other approaches such as finite elements or symmetrical components methods. © 2023, Allerton Press, Inc.

关键词： Stators

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Multivariable Nonlinear control based on Exact Feedback Linearization with Integral Action for a PMSM

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Engineering Letters 2024年第12期32卷 2270-2277页

作者： Velarde-Gomez, Sergio Giraldo, Eduardo Universidad Tecnológica de Pereira Research Group in Automatic Control Pereira Colombia Department of Electrical Engineering Universidad Tecnológica de Pereira Research group in Automatic Control Pereira Colombia

This paper introduces a novel approach for linear quadratic optimal control design for a nonlinear control structure based on a feedback linearization method and applied over permanent magnet synchronous motor (PMSM). The design of the proposed approach is developed by considering rotational speed, direct and quadrature currents as state variables. To achieve accurate tracking of the desired rotational speed, an additional nonlinear controller with integral action is implemented, also employing the exact feedback linearization method, and since the reference for the quadrature current is selected as zero only regulation is required. Consequently, a multivariable nonlinear controller is achieved using exact feedback linearization, offering robustness against external disturbances like torque load. The proposed method is assessed through simulations on a PMSM motor, and the speed reference tracking performance is analyzed with and without integral action. An additional comparison is carried out by incorporating a pole placement technique into the controller design. The proposed exact feedback linearization approach with integral action and linear quadratic control, demonstrates superior performance over other methods in terms of disturbance rejection, control effort and speed tracking. © 2024, International Association of Engineers. All rights reserved.

关键词： Disturbance rejection

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Influence of Histogram Equalization on Multi-Classification of Retinal Diseases in OCT B-scans 27

Influence of Histogram Equalization on Multi-Classification ...

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27th IEEE Signal Processing: Algorithms, Architectures, Arrangements, and Applications, SPA 2024

作者： Marciniak, Tomasz Stankiewicz, Agnieszka Poznan University of Technology Institue of Automatic Control and Robotics Department of Automatic Control Robotics and Electrical Engineering Poznan Poland

ISBN: (纸本)9788362065486

The aim of this article is to analyze the impact of adaptive histogram equalization of the human eye OCT B-scans on the effectiveness of the classification of pathological changes. Tests were performed on two datasets. The first dataset contains 4 class B-scans (CNV, DME, DRUSEN, and NORMAL) taken with the use of Spectralis Heidelberg device, while the second dataset contains images from two devices (Spectralis Heidelberg OCT and Avanti Optovue OCT) and additionally contains the VMT (i.e., vitreomacular traction) class. The images were subjected to standard histogram equalization and contrast limited adaptive histogram equalization (CLAHE) with various parameters. The classification process was carried out using VGG16 artificial neural network. It can be observed that histogram equalization has no significant impact on improving classification performance. © 2024 Division of Signal Processing and Electronic Systems, Poznan University of Technology (DSPES PUT).

关键词： Optical coherence tomography

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Fractional-Order Newton-Like State Estimator for Discrete-Time Nonlinear Systems 21

Fractional-Order Newton-Like State Estimator for Discrete-Ti...

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21st International Conference on Electrical Engineering, Computing Science and automatic control, CCE 2024

作者： Oliva-Gonzalez, Lorenz Josue Martinez-Guerra, Rafael Cinvestav Automatic Control Department Mexico City Mexico

ISBN: (纸本)9798350377545

In this paper, we discuss the state estimation problem for discrete-Time nonlinear systems under a zero search approach. In this sense, a state estimator based on the fractional-order extension of the well-known Newton's method is designed. The properties presented by this estimator are inherited from the aforementioned method, in addition, compared to the classical Newton's method, the fractional order extension has significant advantages such as fewer iterations to achieve convergence and wider regions of attraction for the zeros. On the other hand, considering other estimation methods, the presented approach offers a better performance in general. © 2024 IEEE.

关键词： Newton-Raphson method

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