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Harmonic insertion in PWM inverter drive schemes

European Transactions on Electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

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Modelling 3D magnetic networks in a realistic solar atmosphere

arXiv

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arXiv 2019年

作者： Gent, Frederick A. Snow, Ben Fedun, Viktor Erdélyi, Robertus Academy of Finland ReSoLVE Centre of Excellence Department of Computer Science Aalto University FI-02150 Finland College of Engineering Mathematics and Physical Sciences University of Exeter EX4 4QF United Kingdom School of Mathematics Statistics and Physics Newcastle University NE1 7RU United Kingdom School of Mathematics and Statistics University of Sheffield S3 7RH United Kingdom Plasma Dynamics Group Department of Automatic Control and Systems Engineering University of Sheffield S1 3JD United Kingdom Department of Astronomy Eötvös Loránd University Pázmány Péter sétány 1/A Budapest H-1117 Hungary

The magnetic network extending from the photosphere (solar radius ' R) to lower corona (R + 10 Mm) plays an important role in the heating mechanisms of the solar atmosphere. Here we further develop the models with realistic open magnetic flux tubes of the authors in order to model more complicated configurations. Closed magnetic loops, and combinations of closed and open magnetic flux tubes are modelled. These are embedded within a stratified atmosphere, derived from observationally motivated semi-empirical and data-driven models subject to solar gravity and capable of spanning from the photosphere up into the chromosphere and lower corona. Constructing a magnetic field comprising self-similar magnetic flux tubes, an analytic solution for the kinetic pressure and plasma density is derived. Combining flux tubes of opposite polarity it is possible to create a steady background magnetic field configuration modelling a solar atmosphere exhibiting realistic stratification. The result can be applied to SOHO/MDI and SDO/HMI and other magnetograms from the solar surface, upon which photospheric motions can be simulated to explore the mechanism of energy transport. We demonstrate this powerful and versatile method with an application to Helioseismic and Magnetic Imager data. Copyright © 2019, The Authors. All rights reserved.

关键词： 3D modeling

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Self-optimizing Production systems

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Procedia CIRP 2016年 41卷 417-422页

作者： Eike Permin Felix Bertelsmeier Matthias Blum Jennifer Bützler Sebastian Haag Sinem Kuz Denis Özdemir Sebastian Stemmler Ulrich Thombansen Robert Schmitt Christian Brecher Christopher Schlick Dirk Abel Reinhart Poprawe Peter Loosen Wolfgang Schulz Günther Schuh Fraunhofer Institute for Production Technology (IPT) Steinbachstraße 17 52064 Aachen Germany Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University Steinbachstraße 53 52074 Aachen Institute for Industrial Management (FIR) at RWTH Aachen University Campus-Boulevard 55 52074 Aachen Institute of Industrial Engineering and Ergonomics (IAW) of RWTH Aachen Bergdriesch 27 52062 Aachen Institute of Automatic Control (IRT) Steinbachstraße 54 52074 Aachen Fraunhofer Institute for Laser Technology (ILT) Steinbachstraße 15 52074 Aachen Germany Chair for Laser Technology (LLT) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Chair for Technology of Optical Systems (TOS) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany Department Nonlinear Dynamics of Laser Processing (NLD) at RWTH Aachen University Steinbachstrasse 15 52074 Aachen Germany

Today's manufacturers are facing numerous challenges such as highly entangled and interconnected supply chains, shortening product lifecycles and growing product complexity. They thus feel the need to adjust and adapt faster on all levels of value creation. Self-optimization as a basic principle appears a promising approach to handle complexity and unforeseen disturbances within supply chains, machines and processes. Therefore it will improve the resilience and competitiveness of manufacturing companies. This paper gives an introduction to the concept of self-optimizing production systems. After a short historical review, the different levels of value creation from supply chain design and management to manufacturing and assembly are analyzed considering their specific demands and needs for self-optimization. Examples from each of these levels are used to illustrate the concept of self-optimization as well as to outline its potential for flexibility and productivity. This paper closes with an outlook on the current scientific work and promising new fields of action.

关键词： Artificial intelligence Optimization control Management

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Preface

Springer Proceedings in Advanced Robotics

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Springer Proceedings in Advanced Robotics 2018年 6卷 vii-viii页

作者： Groß, Roderich Kolling, Andreas Berman, Spring Frazzoli, Emilio Martinoli, Alcherio Matsuno, Fumitoshi Gauci, Melvin Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Arizona State University TempeAZ United States Massachusetts Institute of Technology CambridgeMA United States Lausanne Switzerland Department of Mechanical Engineering and Science Kyoto University Kyoto Japan Wyss Institute for Biologically Inspired Engineering Harvard University CambridgeMA United States

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Social and Ethical Issues in Various Medical Procedures

Social and Ethical Issues in Various Medical Procedures

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Progress in Applied Electrical engineering (PAEE)

作者： Piotr Sterniuk Waldemar Karwowski Henryk Racheniuk Adrian Luckiewicz Anna Wieczorek Mateusz Paw၂owski Witold Libionka Anna W၂odarczyk Katarzyna Bojkowska-Otrebska Adam Sudo၂ Bartosz Pańczyszak Aleksandra Kawala-Sterniuk Technology Transfer Center Opole University of Technology Opole Poland Department of Industrial Engineering and Management Systems University of Central Florida Orlando FL USA Faculty of Physical Education and Physiotherapy Opole University of Technology Opole Poland Faculty of Electrical Engineering Automatic Control and Informatics Opole University of Technology Opole Poland Vital Medic Hospital Kluczbork Poland Faculty of Health Sciences Wroclaw Medical University Wroclaw Poland Department of Neurosurgery Medical University of Gdansk Gdansk Poland Faculty of Stobrawskie Centrum Medyczne Clinical Department of Geriatrics Kup Poland Institute of Medical Sciences University of Opole Opole Poland Faculty of Natural Sciences and Technology University of Opole Opole Poland Faculty of Health Sciences Jan Dlugosz University in Czestochowa Czestochowa Poland

Medical procedures, in particular those invasive, generate significant ethical, legal, and social concerns, including the issues of humanity and person-hood, stigma, autonomy, privacy and security, research ethics, safety, moral and legal responsibility, fair access, and justice. It was pointed out that future research should focus on developing practical solutions to the ethical challenges of medical experimental procedures with human participants, facilitated by the collection of empirical data on the perspectives shared by the general public, researchers and of course study participants.

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Model-based neuro-fuzzy control of FiO2 for intensive care mechanical ventilation

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Crit Care 2001年第SUPPL 1期5卷 P002-P002页

作者： HF Kwok GH Mills M Mahfouf DA Linkens Department of Surgical & Anaesthetic Sciences Sheffield University and the Intensive Care Unit Royal Hallamshire Hospital Sheffield S10 2JF UK Department of Automatic Control and Systems Engineering Sheffield University Sheffield S1 3JD UK

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Preface

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International Journal of Simulation and Process Modelling 2020年第3期15卷 199-200页

作者： Guo, Lingzhong Lu, Shaowen Zhao, Dongya Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom Northeastern University 11-3 Wenhua Rd. Shenyang110819 China 66 West Changjiang Road Qingdao266580 China

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PREFACE

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International Journal on Artificial Intelligence Tools 2006年第3期15卷 331-333页

作者： GEORGE D. MAGOULAS GEORGIOS DOUNIAS DEREK A. LINKENS School of Computer Science and Information Systems Birkbeck College University of London Malet Street London WC1E 7HX UK Department of Financial and Management Engineering University of the Aegean 31 Fostini Street 82100 CHIOS GR Greece Department of Automatic Control and Systems Engineering The University of Sheffield Mappin Street Sheffield S1 3JD UK

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Tremor after long term lithium treatment;Is it cortical myoclonus?

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Cerebellum and Ataxias 2019年第1期6卷 5页

作者： Sarrigiannis, Ptolemaios Georgios Zis, Panagiotis Unwin, Zoe Charlotte Blackburn, Daniel J. Hoggard, Nigel Zhao, Yifan Billings, Stephen A. Khan, Aijaz A. Yianni, John Hadjivassiliou, Marios Department of Clinical Neurophysiology Sheffield Teaching Hospitals NHS Foundation Trust Royal Hallamshire Hospital Sheffield United Kingdom Department of Neurology Sheffield Teaching Hospitals NHS Foundation Trust Sheffield United Kingdom Department of Neuroradiology Sheffield Teaching Hospitals NHS Foundation Trust Sheffield United Kingdom Through-life Engineering Services Centre Cranfield University Bedford MK43 0AL United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD United Kingdom Department of Neurosurgery Sheffield Teaching Hospitals NHS Foundation Trust Sheffield United Kingdom

Introduction: Tremor is a common side effect of treatment with lithium. Its characteristics can vary and when less rhythmical, distinction from myoclonus can be difficult. Methods: We identified 8 patients on long-term treatment with lithium that developed upper limb tremor. All patients were assessed clinically and electrophysiologically, with jerk-locked averaging (JLA) and cross-correlation (CC) analysis, and five of them underwent brain MRI examination including spectroscopy (MRS) of the cerebellum. Results: Seven patients (6 female) had action and postural myoclonus and one a regular postural and kinetic tremor that persisted at rest. Mean age at presentation was 58 years (range 42-77) after lengthy exposure to lithium (range 7-40 years). During routine monitoring all patients had lithium levels within the recommended therapeutic range (0.4-1 mmol/l). There was clinical and/or radiological evidence (on cerebellar MRS) of cerebellar dysfunction in 6 patients. JLA and/or CC suggested a cortical generator of the myoclonus in seven patients. All seven were on antidepressants and three additionally on neuroleptics, four of them had gluten sensitivity and two reported alcohol abuse. Conclusions: A synergistic effect of different factors appears to be contributing to the development of cortical myoclonus after chronic exposure to lithium. We hypothesise that the cerebellum is involved in the generation of cortical myoclonus in these cases and factors aetiologically linked to cerebellar pathology like gluten sensitivity and alcohol abuse may play a role in the development of myoclonus. Despite the very limited evidence in the literature, lithium induced cortical myoclonus may not be so rare. © 2019 The Author(s).

关键词： Cerebellar ataxia Cortical myoclonus Gluten sensitivity JLA Lithium MRS

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A DYNAMIC ANALYSIS OF A COGAS PROPULSION PLANT

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Naval Engineers Journal 1977年第6期89卷 19-34页

作者： ABBOTT, JACK W. McINTIRE, JOHN G. RUBIS, C. JOSEPH Mr. Jack W. Abbott:is Head of the Systems Engineering and Analysis Branch Ship Design Division Naval Ship Engineering Center. He received his BSME degree from Stanford University in 1960 and his ME A degree from The George Washington University in 1975. He is a Lieutenant Commander USNR (Ret.) having served during his active duty period as Engineering Officer aboard a U. S. destroyer for 3 years and also a registered Professional Engineer in the State of California. In addition to holding several U.S. Patents he annually instructs courses in the Design of Naval Surface Ships at the Massachusetts Institute of Technology including the concept of total energy systems. He is a member of SNAME and has been a member of ASNE and a frequent contributor to the Journal since 1966 most recently having been a co—recipient of the “Jimmie Hamilton” Award for the best paper published in 1976. Mr. John G. Mclntire:received his BS and MS degrees from the University of California at Berkeley where he did his graduate studies in the field of Automatic Control Systems Design. He was employed by the Naval Ship Engineering Center in 1971 as a Mechanical Engineer and is currently serving as Acting Head of the Machinery Control Systems Section Machinery Systems Division. He is a member of the NA VAIR/NA VSEA Association of Scientists and Engineers the American Society of Mechanical Engineers and the National Society of Professional Engineers. Mr. C. Joseph Rubls:isPresident of Propulsion Dynamics Inc. Annapolis Md. where he is engaged in simulation and analytical studies of ship propulsion and automation systems. Previous to his present position he was a Scientific Consultant and Head of the Control Systems Branch David W. Taylor Naval Ship Research & Development Center Annapolis Laboratory where he was employed over a 10–year period. His other employment experience includes the Martin—Marietta Company as Senior Systems Engineer for Guidance Radar and for Communications Systems the U.S. Naval Academy American Universi

The paper provides a dynamic analysis of a COGAS Propulsion Plant, including mathematical modeling and simulation, and concludes with the results of a COGAS simulation which indicates encouraging conclusions regarding...

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