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A Time-Frequency Local Polynomial Approach to FRM Estimation from Incomplete Data

IFAC-PapersOnLine 2023年第2期56卷 3942-3947页

作者： Nic Dirkx Koen Tiels Tom Oomen ASML Research Mechatronics & Control Veldhoven The Netherlands Eindhoven University of Technology Department of Mechanical Engineering Control Systems Technology Eindhoven The Netherlands Delft Center for Systems and Control Delft University of Technology Delft The Netherlands

Frequency Response Matrix (FRM) estimation from measured data is an important step towards the control of complex systems, including motion and thermal systems. Missing samples in the measured data records, e.g., due to sensor failure or faulty data transmission, often occur. In this paper, a method is presented for the nonparametric FRM identification of multiple-inputs multiple-outputs (MIMO) systems from incomplete and noisy data records. The method exploits time- and frequency-domain localizing wavelets to accurately estimate the FRM and its covariance from the time-frequency plane. Good performance is demonstrated in a simulation study.

关键词： Frequency response function identification missing data transient estimation multiple-inputs multiple-outputs linear systems

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Bifurcation Analysis of Current-mode controlled CUK converter 2

Bifurcation Analysis of Current-mode controlled CUK converte...

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2nd Asian Conference on Innovation in Technology, ASIANCON 2022

作者： Kumar, Avinash Valluru, Sudarshan K. Delhi Technological University Control of Dynamical Systems and Computation Lab Department of Electrical Engineering Delhi India

ISBN: (数字)9781665468510

ISBN: (纸本)9781665468510

This paper analyses the bifurcation behaviour of the CUK converter operating under continuous conduction mode. Discrete-time mapping is used to analyse the bifurcation parameters operating under a closed loop with a current-controlled scheme. to study the bifurcation diagram parameters like reference current and the Input voltage are varied by keeping others constant. It has been observed that the system loses its stability and bifurcates from 1 time-periodic to 2-time-periodic. The system then enters into chaos. These phenomena have been observed in the bifurcation diagram and hence the maximum range in which the converter can operate safely is known and is validated by time-domain waveforms and phase plots. © 2022 IEEE.

关键词： Bifurcation (mathematics)

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Comparison of Various Mathematical Models of 8/20 μs Current Surge and their Influence on RFID Marker 14

Comparison of Various Mathematical Models of 8/20 μs Curren...

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14th International Conference ELEKTRO, ELEKTRO 2022

作者： Vestenicky, Peter Kanalikova, Alzbeta University of Žilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Žilina Slovakia

ISBN: (纸本)9781665467261

In technical praxis the underground facility networks such as gas and water pipes or telecommunication and energetic cables are marked by special RFID markers to enable localization and identification of the network. Due to influence of climatic effects such as lightning part of the lightning surge current may be induced into the markers. This paper gives a comparison of various mathematical models of the surge current induced into conductors and these mathematical models are used to calculate current waveform in the markers. Finally, the voltage waveform across the capacitor in the marker resonant circuit is calculated to enable proper dimensioning of the capacitor and to increase the long term marker reliability. © 2022 IEEE.

关键词： Differential equations

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Sharing and Collaborating When Teaching Automatic control: An Experience-Based Needs Analysis 32

Sharing and Collaborating When Teaching Automatic Control: A...

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32nd Mediterranean Conference on control and Automation, MED 2024

作者： Knorn, Steffi Garone, Anja Varagnolo, Damiano Garone, Emanuele Technische Universität Department of Control Berlin Germany Brussels Institute for Advanced Studies Belgium Norwegian University of Science and Technology Department of Engineering Cybernetics Norway University of Padova Department of Information Engineering Italy Free University of Brussels Department of Automation and Systems Analysis Belgium

ISBN: (纸本)9798350395440

We discuss two specific issues that affected the workflows in our career as automatic control teachers and that are related to how teachers may establish teaching-oriented collaborations with colleagues from the same or different institutions. The first issue we identify is the systematic difficulty that one encounters when wanting to exchange instructional material with colleagues, while the second is the complexity of establishing students exchange programs across different institutions and nations. We discuss the nature and structure of the two problems, discuss why and how they are connected, and draw practical examples of how these problems may affect workflows. We then present a strategy that aims at solving these issues based on the introduction of an opportune indexing of instructional material in terms of contents and complexity of such contents, and how this information may be graphically displayed so to ease human and machine interpretability. We further discuss how this approach was used on a smaller scale to ease collaborations among close colleagues, and how it may be extended and adopted on a larger scale. © 2024 IEEE.

关键词： Process control

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14th International Conference ELEKTRO, ELEKTRO 2022

作者： Zdansky, Juraj Hrbcek, Jozef Rastocny, Karol University of Žilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Žilina Slovakia

ISBN: (纸本)9781665467261

Safety PLCs have become a popular device for implementing safety functions in industrial applications. Their correct use is the prerequisite for achieving the required safety integrity level (SIL). This is closely related to the parametrization of the safety PLC (setting of the parameters). This paper deals mainly with parameters influencing the safety of two-channel connection of sensors to the safety PLC. © 2022 IEEE.

关键词： Accident prevention

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Safety Aspects of the Wheeled Mobile Robot 14

Safety Aspects of the Wheeled Mobile Robot

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14th International Conference ELEKTRO, ELEKTRO 2022

作者： Nemec, Dusan Andel, Jan Simak, Vojtech Pirnik, Rastislav University of Zilina Faculty of Electrical Engineering and Information Technology Department of Control and Information Systems Zilina Slovakia

ISBN: (纸本)9781665467261

This paper discusses the safety of mobile robots and proposes improvements by specific methods of collision avoidance, and by changes of logical architecture or the communication protocol. The proposed architecture is semi-distributed, which allows optimalization of the load balance among components while supporting strict safety rules. Such approach allows development of small-size mobile intelligent robots using low-cost computational hardware. © 2022 IEEE.

关键词： Mobile robots

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GaAs pHEMT Traveling Wave Amplifiers up to 50 GHz

GaAs pHEMT Traveling Wave Amplifiers up to 50 GHz

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2022 International Siberian Conference on control and Communications, SIBCON 2022

作者： Danilov, D.S. Zdov, A.V. Batoev, T.M. Malyutin, N.D. Tomsk State University of Control Systems and Radioelectronics Department of Microwave and Quantum Radio Engineering Tomsk Russia

ISBN: (纸本)9781665476287

The article presents the results of the development of two ultra-wideband traveling wave amplifiers. These monolithic microwave integrated circuits (MMICs) were developed using gallium arsenide (GaAs) pseudomorphic high electron mobility transistor (pHEMT) technology. One was designed based on a 0.25 μm GaAs pHEMT process with gain up to 30 GHz, and the other based on a 0.1 μm GaAs pHEMT process up to 50 GHz. The measured S-parameters for the first MMIC show a gain (S21) of 15±1.5dB in the frequency range 0-30 GHz, input and output return loss (S11, S22) less than -11dB. The measured S-parameters for the second MMIC show a gain of more than 11.5 dB in the frequency range of 0-50 GHz, input and output return loss of less than -9dB. © 2022 IEEE.

关键词： Gallium arsenide

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A Unifying Complexity-Certification Framework for Branch-and-Bound Algorithms for Mixed-Integer Linear and Quadratic Programming

arXiv

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arXiv 2025年

作者： Shoja, Shamisa Arnström, Daniel Axehill, Daniel Division of Automatic Control Department of Electrical Engineering Linköping University Sweden Division of Systems and Control Department of Information Technology Uppsala University Sweden

In model predictive control (MPC) for hybrid systems, solving optimization problems efficiently and with guarantees on worst-case computational complexity is critical to satisfy the real-time constraints in these applications. These optimization problems often take the form of mixed-integer linear programs (MILPs) or mixed-integer quadratic programs (MIQPs) that depend on system parameters. A common approach for solving such problems is the branch-and-bound (B&B) method. This paper extends existing complexity certification methods by presenting a unified complexity-certification framework for B&B-based MILP and MIQP solvers, specifically for the family of multi-parametric MILP and MIQP problems that arise in, e.g., hybrid MPC applications. The framework provides guarantees on worst-case computational measures, including the maximum number of iterations or relaxations B&B algorithms require to reach optimality. It systematically accounts for different branching and node selection strategies, as well as heuristics integrated into B&B, ensuring a comprehensive certification framework. By offering theoretical guarantees and practical insights for solver customization, the proposed framework enhances the reliability of B&B for real-time application. The usefulness of the proposed framework is demonstrated through numerical experiments on both random MILPs and MIQPs, as well as on MIQPs arising from a hybrid MPC problem. © 2025, CC BY.

关键词： Branch and bound method

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Higher harmonics influence on stability of arcing single phase-to-earth faults in 6−10 kV networks with arc-suppression coil

Higher harmonics influence on stability of arcing single pha...

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2021 IEEE Power and Energy Student Summit, PESS 2021

作者： Kutumov, Yuri D. Shadrilkova, Tatyana Yu. Shuin, Vladimir A. Automatic Control of Electrical Power Systems Department Ivanovo State Power Engineering University Ivanovo Russia

ISBN: (纸本)9783800757169

This paper focuses on the research of steady-state earthing arc burning conditions in the context of influence of higher harmonic components in earth fault current. The criteria of arc burning stability and of single phase-to-earth fault transfer to phase-to-phase short circuit are offered in the paper. Calculation of the time period for which arcing single phase-to-earth fault transfers to phase-to-phase short circuit, was conducted. Also the root mean square value of residual fault current which makes steady-state earthing arc burning possible, was defined with the usage of COMSOL Multiphysics and PSCAD software. The obtained results can be used during development and research of single phase-to-earth fault and thermal overload relay protection devices. © VDE VERLAG GMBH · Berlin · Offenbach.

关键词： Electric grounding

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Improving Workplace Safety in the Cargo Industry through Posture Monitoring using Mediapipe and Machine Learning 17

Improving Workplace Safety in the Cargo Industry through Pos...

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17th International Conference on INnovations in Intelligent systems and Applications, INISTA 2023

作者： Cobb, Buket Sonbas Candan, Fethi Harran University Department of Electrical-Electronics Engineering Sanliurfa63190 Turkey University of Sheffield Department of Automatic Control and Systems Engineering SheffieldS1 3JD United Kingdom

ISBN: (纸本)9798350338904

This research reveals the potential of Mediapipe with machine learning methods in addressing the critical need for real-time posture monitoring, offering a promising solution for creating secure work environments and improving health and safety conditions not only in the cargo industry but also in other fields, such as healthcare, sports, and industry. The findings indicate that the Random Forest Classifier demonstrates the highest accuracy in classifying untrained movements, indicating its potential for developing a posture correction warning system. Further research is needed to validate the findings and explore real-world applications. Overall, this study contributes to the advancement of workplace safety and sets the foundation for future developments in posture monitoring systems using Mediapipe and machine learning using Python programming. © 2023 IEEE.

关键词： Python

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