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Constrained State-Feedback control of an Externally Excited Synchronous Machine

Constrained State-Feedback Control of an Externally Excited ...

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Mediterranean Conference on control & Automation

作者： Sabin - Constantin Carpiuc Mircea Lazar Faculty of Automatic Control and Computer Engineering Technical University "Gheorghe Asachi" of Iasi Department of Electrical Engineering Eindhoven University of Technology

ISBN: (纸本)9781479909964

State-feedback control of externally excited synchronous machines employed in applications such as hybrid electric vehicles and full electric vehicles is a challenging problem. Indeed, these applications are characterized by fast dynamics that are subject to hard physical and control constraints. The goal of this paper is to provide a controller synthesis method that can answer these challenges effectively. To this end, firstly, a linear control law is obtained for the unconstrained dynamics via a standard control Lyapunov function (CLF), along with an admissible basin of attraction. Then, a piecewise affine control law defined on a cubic partition of the state-space is obtained for the constrained dynamics via a flexible CLF. An a posteriori test for checking stability and invariance of a set of initial conditions for the resulting closed-loop dynamics is also proposed. The effectiveness of the developed synthesis method is demonstrated in a realistic simulation scenario.

关键词： state feedback control synchronous machines feedback control region of attraction chlorofibre Hybrid electric vehicles Peptide Synthesis Technique Organic Synthesis Techniques Inorganic Synthesis Techniques control law invariance dynamics INITIAL CONDITIONS all-electric

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Deep Learning-Based Retinal Blood Vessel Segmentation Using U-Net Architecture

Deep Learning-Based Retinal Blood Vessel Segmentation Using ...

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E-Health and Bioengineering Conference (EHB)

作者： Ligia-Gabriela Boazu Marian-Alexandru Petraru Otilia Zvorișteanu Dept. of Computer Science and Engineering Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iași Iași Romania

ISBN: (数字)9798331532147

ISBN: (纸本)9798331532154

Retinal blood vessel segmentation is an essential component in the diagnosis and monitoring of various ophthalmological conditions, such as diabetic retinopathy, glaucoma or macular degeneration, providing valuable information about the state of blood vessels and ocular blood circulation. Traditional methods for segmenting blood vessels from retinal images present certain limitations in terms of accuracy and robustness, especially under variable lighting conditions, the presence of artifacts or low-quality images. However, current techniques based on convolutional neural networks have demonstrated the ability to achieve precise and robust segmentations in a variety of conditions, outperforming traditional methods. Nevertheless, neural networks face challenges regarding the limited availability of retinal image datasets necessary for training and evaluating these solutions. In this paper we describe a solution for retinal blood vessel segmentation using the U-Net architecture. This neural network achieves impressive results even with very small datasets, demonstrating the efficiency and robustness of the U-Net architecture for retinal blood vessel segmentation.

关键词： Training Macular degeneration Image segmentation Neural networks Blood vessels Network architecture Retina Robustness Monitoring Biomedical imaging

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Enhancing Learning and Therapy for Children with Autism: Innovative Activities with the NAO Robot

Enhancing Learning and Therapy for Children with Autism: Inn...

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E-Health and Bioengineering Conference (EHB)

作者： Iustina-Bianca Bulai Otilia Zvorişteanu Dept. of Computer Science and Engineering Faculty of Automatic Control and Computer Engineering “Gheorghe Asachi” Technical University of Iaşi Iaşi Romania

ISBN: (数字)9798331532147

ISBN: (纸本)9798331532154

Worldwide, autism affects 1 in 100 children, with diagnoses steadily rising since the 2000s. Romania lacks official statistics on autism prevalence, but global estimates suggest similarity. Children with autism struggle with social interactions and verbal communication, prompting interest in social robots for therapy and education. Tailored robot-assisted sessions offer potential for cognitive development, vocabulary enhancement, social interaction, and behavioral stimulation like concentration and attention. The NAO robot's user-friendly design, technical capabilities, and integrated features make it well-suited for these purposes. This paper presents activities that exemplify the concept of “learning through play,” allowing children to engage in exploration, experimentation, and effective learning in an enjoyable manner.

关键词： Autism Vocabulary Hospitals Social robots Education Biomedical engineering

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Vertical Take-Off and Landing fixed-wing designed for autonomous missions

Vertical Take-Off and Landing fixed-wing designed for autono...

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IEEE/ASME (AIM) International Conference on Advanced Intelligent Mechatronics

作者： Krzysztof Lewandowski Jakub Tomczak Jakub Zeifert Szymon Nowacki Marcel Król Dawid Rudy Jacek Grzybowski Paweł Piórkowski Roman Czyba Marcin Lemanowicz Piotr Czekalski Department of Automatic Control Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland Department of Chemical Engineering and Process Design Faculty of Chemistry Silesian University of Technology Gliwice Poland

This paper presents the design and development of a Vertical Take-off and Landing (VTOL) fixed-wing aircraft intended for autonomous missions. It provides an overview of the current state of VTOL technology and its applications. The paper focuses on fixed-wing VTOL aircraft created by Academic Scientific Association High Flyers from the Silesian University of Technology in Poland. The design process and considerations are discussed in detail, including aerodynamics, selection of materials, hardware, control systems and software. Finally, the paper discusses real-world scenarios that the designed UAV could be used to solve real-world problems, such as targeted plant protection or the deployment of oral vaccines for wildlife. The authors successfully tested solutions presented in the paper during competitions and real practical applications. Overall, this paper provides a comprehensive look into the design and development of a VTOL aircraft for autonomous missions and presents its effectiveness and capabilities in solving real-life problems.

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Selecting sensor for on load tap changer contacts degree of wear diagnostics

Selecting sensor for on load tap changer contacts degree of ...

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作者： Cichoń, A. Boruckia, S. Bergerb, P. Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Prószkowska 76 45-758 Opole Poland TurboCare Poland S.A. Powstańców slĄskich 85 42-701 Lubliniec Poland

Results of scientific research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the coupling process acoustic emission signals are generated by: the mechanical setup of tap changer, contacts operation, and other phenomena. For most on load tap changers types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register acoustic emission signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. Acoustic emission signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of acoustic emission signals generated by on load tap changers working under laboratory conditions, with applied measuring transducers with different transmittances, is presented in the paper. The comparative analysis was performed in order to determine their suitability for on load tap changers technical condition diagnosis. Based on the results achieved, one transducer which allows the registration of acoustic events generated during on load tap changers operation was selected.

关键词： Tanks (containers)

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Artificial intelligence modelling methodologies applied to a polymerization process

Artificial intelligence modelling methodologies applied to a...

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International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH)

作者： Silvia Curteanu Elena-Niculina Dragoi Florin Leon Cristina Butnariu Faculty of Chemical Engineering and Environmental Protection “Gheorghe Asachi” Technical University of Iasi Iasi Romania Faculty of Automatic Control and Computer Engineering Bucharest Romania

A series of modelling methodologies based on artificial intelligence tools are applied to solve a complex real-world problem. Neural networks and support vector machines are used as models and differential evolution and clonal selection algorithms as optimizers for structural and parametric optimization of the models. The goal is to make a comparative analysis of these methods for the case study of the free radical polymerization of styrene, a complex, difficult to model process, where the monomer conversion and molecular masses are predicted as a function of reaction conditions, i.e. temperature, amount of initiator and time. Four modelling methodologies are developed and evaluated in terms of accuracy.

关键词： Support vector machines Kernel Computational modeling Testing Polymers Manganese Optimization

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ANFIS based Jacobian for a parallel manipulator mobility assistive device 10

ANFIS based Jacobian for a parallel manipulator mobility ass...

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10th UKACC International Conference on control, control 2014

作者： Asker, Ahmed Salah, Omar Fath El-Bab, Ahmed M. R. Ramadan, Ahmed A. Assal, Samy M. F. Sessa, Salvatore Abo-Ismail, Ahmed School of Innovative Design Engineering Egypt-Japan University for Science and Technology E-JUST New-Borg-El-Arab-City-Alexandria Egypt Mechanical Engineering Dept Faculty of Engineering Assiut University Assiut Egypt Dept. of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Tanta Egypt Computer and Automatic Control Dept Faculty of Engineering Tanta University Tanta Egypt Graduate School of Creative Science and Engineering Waseda University Tokyo Japan

ISBN: (纸本)9781479950119

Nowadays parallel manipulators are used widely in bioengineering applications;this leads to many exciting expectations as well as challenges. The kinematic analysis of parallel manipulators with their differential kinematics yielding the Jacobian in a closed form is not a trivial task. In this paper a parallel manipulator based mobility assistive device called EJADII is analyzed to determine forward kinematics, inverse kinematics and closed-form Jacobian. An Adaptive Neuro-Fuzzy Inference System (ANFIS) is trained to estimate the Jacobian. This system would be useful when determination of the Jacobian in a closed-form is difficult to determine. The human motion during sit to stand captured by VICON experiment is used with two assisting scenarios to train and verify this system. computer simulations show relatively good results of the proposed system. © 2014 IEEE.

关键词： Inverse kinematics

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Hardware Acceleration in Ceph Distributed File System

Hardware Acceleration in Ceph Distributed File System

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International Symposium on Parallel and Distributed Computing

作者： Pistirica Sorin Andrei Moldoveanu Florica Moldoveanu Alin Asavei Victor Caraman Mihai Claudiu Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania Faculty of Electrical Engineering and Computer Science Transylvania University of Brasov Brasov Romania

ISBN: (纸本)9781479907342

Cloud computing becomes more and more popular providing the means to organize and deliver almost any kind of data and software services. Since it is inherently scalable to support rapid economic growth and productivity, its distributed data storage layer needs to be capable to address these requirements. A distributed file system contains a large number of cluster nodes and a large number of clients interacting with it. In this article, we propose two acceleration mechanisms based on multi-core network SoC to maximize each cluster node performance. First, the requests to the cluster node are balanced evenly on the platform cores, and second the requests are classified to decrease latency of sensitive operations and improve the overall cluster responsiveness and availability. For implementation, tests and measurements we have used a novel open source distributed file system: Ceph. Among many advantages over the competitors of Ceph we mention preservation of POSIX API, completely decoupled data and metadata and usage of object storage devices instead of block devices.

关键词： Hardware System-on-chip Engines Monitoring File systems Multicore processing

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Identification of Magnetorheological Damper Model for Off-Road Vehicle Suspension 21st

Identification of Magnetorheological Damper Model for Off-Ro...

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21st Polish control Conference, PCC 2023

作者： Krauze, Piotr Placzek, Marek Zmudka, Zbigniew Bauke, Dawid Olszowka, Przemyslaw Turek, Jakub Wycislok, Artur Ziaja, Maciej Zosgornik, Szymon Janusz, Wojciech Przybyla, Grzegorz Wychowanski, Michal Silesian University of Technology Faculty of Automatic Control Electronics and Computer Science Akademicka 16 Gliwice44-100 Poland Silesian University of Technology Faculty of Mechanical Engineering Konarskiego 18A Gliwice44-100 Poland Silesian University of Technology Faculty of Energy and Environmental Engineering Konarskiego 18 Gliwice44-100 Poland Engineering Office Ozarow27-530 Poland Gliwice Poland

ISBN: (纸本)9783031351693

The article presents results of experimental identification of MR (magnetorheological) damper model for an off-road vehicle. Original shock-absorbers of the vehicle were replaced by suspension MR dampers supplied by a dedicated measurement and control system. The vehicle includes several sensors which allow to observe electric currents controlling MR dampers, forces generated in the front vehicle suspension columns and other sensors which measure deflection of these suspension parts. The front part of the semi-active suspension was tested using laboratory setup with vibration mechanical exciters generating sinusoidally variable excitation at frequency equal to 12 Hz. MR dampers were directly controlled by peripheral electronic units generating different constant currents equal to 0, 0.11 and 0.37 A. As a result, evaluated force-velocity characteristics and analysis of MR damper behaviour in the target vehicle were carried out. Further steps of analysis included mathematical description of the selected MR damper using several types of MR damper models, i.e.: Bingham and hyperbolic tangent function models as well as their variants including first-order output dynamics. It was shown that the dynamic model based on hyperbolic tangent function offers the best fitness to the response of the actual MR damper with respect to the mean-squared error. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Off road vehicles

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An Occupant-Centric Comfort control Strategy Using Wearable Smart Devices in Smart-Buildings

An Occupant-Centric Comfort Control Strategy Using Wearable ...

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IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications

作者： Mihaela-Gabriela Boicu Ioana Făgărăşan Grigore Stamatescu Mihaela Vasluianu Cosmin-Florin Fudulu Marius-Alexandru Dobrea Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Faculty of Hidrotechnics Technical University of Civil Engineering of Bucharest Romania

The paper presents a method of assessing thermal comfort in office rooms, using data collected from Fitbit bracelets. The result is a fuzzy system for the level of thermal comfort that wants to meet two objectives: reducing the energy consumption in the building and fulfilling the thermal comfort for the occupants. The representative factors taken into account in this study are: air temperature, relative humidity, user activity, clothing level and skin temperature. The proposed fuzzy system was modeled and simulated in the Matlab/SIMULINK development environment, showing satisfactory results after the analysis of the data taken over a period of several days.

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