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Discrete-time modeling tools for DC-DC converters

Discrete-time modeling tools for DC-DC converters

引用

International Power Engineering Conference (IPEC)

作者： J. Hamar I. Nagy H. Funato Y. Nishida H. Ohsaki E. Masada Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Japan Department of Electric Electronics and Computer Engineering Chiba Institute of Technology Japan University of Tokyo Tokyo Japan Railway Technology Research Institute Tokyo Japan

The objective of the discrete-time modeling tools is twofold. First, they give an insight into the basic ideas of discrete-time modeling of dc-dc converters for university students and interested power electronics specialists. Second, as it is being presented below, the interactive calculation tools facilitate the fast and simple model development in WEB browser after entering the basic circuit and load parameters. This feature can especially be useful for the practicing design engineers, since without long calculations with matrix functions the linearized discrete-time system model is immediately and automatically developed in both mathematical form (state-space equations and transfer functions in the Z domain) and also in graphical form (pole-zero map and bode plot).

关键词： DC-DC power converters Power electronics Power system modeling Electrical engineering Automation Railway engineering Power engineering and energy Electronic learning Vocational training Java

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TRAMMS: Monitoring the evolution of residential broadband Internet traffic

TRAMMS: Monitoring the evolution of residential broadband In...

引用

Future Network and Mobile Summit

作者： Andreas Aurelius Christina Lagerstedt Iñigo Sedano Sándor Molnár Maria Kihl Felipe Mata Acreo AB Kista Sweden Tecnalia-telecom Parque Tecnológico Zamudio Spain High Speed Networks Laboratory Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Electrical and Information Technology Lund University Lund Sweden Networking Research Group Universidad Autónoma de Madrid Madrid Spain

Traffic measurements in broadband access networks are crucial from several points of view. A better understanding of traffic patterns can lead to more efficient network design, which leads to energy and cost savings for the operator and improved end user services. This paper reports on selected traffic measurement results from the Celtic TRAMMS project. The measurements were performed in broadband access networks in Sweden and Spain. The vast majority of the traffic volume is video based and from peer-to-peer applications. This suggests that future access networks should be symmetrical in order to properly cope with the traffic patterns of the future. Geographic locality of end-to-end flows has been identified for incoming and outgoing traffic in Spain, which may be used to analyze peering between ISP's. Finally, we show that stricter legislation in Sweden targeting illegal file sharing led to a dramatic decrease of the traffic. This means that factors not controlled by the networking community may seriously impact traffic patterns and user behaviour thereby indicating the need for closer collaboration between researchers and network designers on one side and politicians and regulators on the other side.

关键词： Internet IP networks Protocols Traffic control DSL Broadband communication Peer to peer computing

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Contrast Vision-based Grasp Force Feedback in Telemanipulation

Contrast Vision-based Grasp Force Feedback in Telemanipulati...

引用

2010 IEEE/ASME international conference on advanced intelligent mechatronics (AIM 2010)

作者： Peter Galambos Andras Roka Peter Baranyi Peter Korondi Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Department of Mechatronics Optics and Information Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The operator usually uses his hands to perform manipulation tasks. She has to feel the reaction forces in high-precision manipulation. The mechanism applied in the human interface device for force and tactile feedback is the most challenging (and usually the most expensive) part of a telepresence device. Bilateral control is a common solution in these systems. However, the coupled force and position control loops have contradicting requirements. Usually, the human operator has to learn a lot until she can "feel the task" in her hand, even in direct manipulation. However, using the plasticity of the human brain sensory substitution can be used to achieve a cheaper and partially decoupled system. The main contribution of this paper is a model of human contrast vision, which is applied to feedback of the grasping force in a telemanipulation system in order to decouple the bilateral control and to achieve a less complex haptic device. A contrast model of a the human vision is introduced and it is applied for grasping force feedback via peripheral vision. The preliminary results are presented.

关键词： Tele-operation Biomechatronics Human-Machine Interface

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Short-term external air temperature prediction for an intelligent greenhouse by mining climatic time series

Short-term external air temperature prediction for an intell...

引用

IEEE International Symposium on Intelligent Signal Processing

作者： Peter Eredics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424450572

Climate control for intelligent greenhouses is currently an active field of research. Model based intelligent greenhouse control systems seem to increase the control performance over traditional solutions. In this paper the control intelligence means the preferably minimal maintenance (heating) cost, within the climatic conditions required to grow sensitive floral cultures. To this purpose it is not enough merely to follow optimally some particular temperature profile. Costs can be minimized if the internal air temperature is predictable within a reasonable time span, and this depends on how well we can predict the dynamics of the external air temperature. The problem is closely related to the prediction of the actual weather conditions within the immediate environment of the greenhouse. The paper demonstrates the limited performance of uninformed, simple methods for temperature forecasts, and introduces more accurate solutions using information from the problem domain.

关键词： Weather forecasting Temperature control Control systems Intelligent control Predictive models Costs Temperature sensors Biological system modeling Economic forecasting Environmental economics

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Application of partial discharge measurement on laboratory aged low voltage cables

Application of partial discharge measurement on laboratory a...

引用

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Z. A. Tamus R. Cselko I. Berta Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The partial discharge (PD) measurement has been developed for medium and high voltage cables to determine the condition of the insulation. Less attention was paid to diagnostics of low voltage cables, while the low voltage control cables act very important role in safe operation of e.g. power plants. By the results of authors, the partial discharge measurement can be applied for low voltage cables, too. Especially, this method can indicate the degradation effected by thermal stress on PE insulated low voltage control cables. In this article, the result of PD measurement on low voltage cables was examined. By using of statistical methods the general state of cables can be determined more precisely.

关键词： Partial discharge measurement Laboratories Aging Low voltage Partial discharges Cable insulation Voltage control Thermal stresses Medium voltage Power generation

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New trend in teaching and learning environments for distance higher education

New trend in teaching and learning environments for distance...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： J. Gati Gy. Kartyas Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

An evergreen problem is application of information technology in teaching and learning processes. Very special data structures, communications, and algorithms are required. In higher education, long experience with distance learning and application of Internet environments generate new and new ideas and methods. A possible enhancement of model based virtual classroom methodology is discussed in this paper. New aspects of a well published approach and method are revealed. An introduction about possible solution of virtual classroom considering recent demand is followed by discusses and evaluations of components of model based classroom, classroom procedures, and constraining and structure of classroom model.

关键词： Computer aided instruction Computer science education Education courses Application software Information technology Internet Accreditation Educational technology Educational programs Electronic learning

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Application of voltage response measurement on low voltage cables

Application of voltage response measurement on low voltage c...

引用

Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Z. A. Tamus I. Berta Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The application of voltage response measurement is a very effective tool to determine of the aging state of oil-paper insulated cables. The initial slope of the decay voltage is directly proportional to the conductivity of the insulation and the initial slope of the return voltage is proportional to the intensity of polarization processes. Therefore, the two main deterioration processes (moistening and thermal aging) of oil-paper insulation can be examined independently. In this paper, the application of voltage response method is examined on laboratory aged low voltage polymeric (PVC and PE) insulated cables and the results were compared to the results of chemical and breakdown tests. By the using of voltage response method the aging state of the insulation i.e. the probable decrease of dielectric strength can be detected.

关键词： Voltage measurement Low voltage Aging Cable insulation Oil insulation Breakdown voltage Dielectrics and electrical insulation Conductivity Polarization Laboratories

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Method for merging multiple exposure color image data

Method for merging multiple exposure color image data

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Andras Rovid Peter Varlaki Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In most of nowadays intelligent systems (robots, vehicles, etc.) the sensing based on image processing represents an essential part. In order to be able to use these systems effectively even if the lighting conditions are not ideal, e.g. dark objects, very bright areas in the scene, etc., multiple exposure based image reproduction algorithms are highly welcome. The main aim of the paper is to introduce a novel method enabling to merge multiple exposure images and obtain a corresponding High Dynamic Range Image.

关键词： Merging Color Dynamic range Image processing Intelligent robots Layout Digital images Lighting Image edge detection Intelligent systems

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Discontinuous modulation of multiphase inverter-fed AC motors

Discontinuous modulation of multiphase inverter-fed AC motor...

引用

European Conference on Power Electronics and Applications

作者： Sandor Halasz Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424444328

Different types of discontinuous PWMs of multiphase inverter-fed ac motors are investigated from point of view of ac motor harmonic losses. The derived expressions for computation of the generalized loss-factors and its components are given for different phase number and for all the investigated PWM methods. It is shown that the discontinuous PWM of multiphase system cannot be as successful as that for the case of three-phase system. Therefore in comparison with continuous PWMs the discontinuous ones have no advantages in case of phase number more than 9. However, the stator harmonic current losses are slightly higher while the rotor harmonic current losses are considerably lower than those in case of three-phase system. At the same time for the phase number over 7 a sensible broadening of the linear voltage control region is impossible for any PWM method. The theoretical derived expressions for stator and rotor losses (derived for infinite value of switching frequency, MATCAD program) are checked by results of direct computation for a finite value of switching frequency (MATLAB program) as well by simulations.

关键词： AC motors Pulse width modulation Pulse width modulation inverters Switching frequency Induction motors Stators Phase modulation Space vector pulse width modulation Voltage control MATLAB

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Modeling supported course programs for engineers

Modeling supported course programs for engineers

引用

International Symposium on Intelligent Systems and Informatics (SISY)

作者： J. Gati Gy. Kartyas Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

A long thinking process leads from the first idea to a well-organized and curriculum based course program. This process has outstanding importance where theoretical, methodological, and practical issues must be considered and coordinated as in the case of higher education for engineering. This paper makes an attempt to emphasize some of the critical elements in this process in order to analyze possibilities for the application of recent computer modeling techniques in planning and application of course programs. In this paper, background and essential issues are outlined in order to introduce the problem. Following this, improved higher education program features are revealed and organized considering resources, environment, as well as decisions on course elements and characteristics. In the rest of the paper, organization of a course by a new application of tracks and modules as well as a new concept of course feature driven module are explained. Practice aspect of model based course development is emphasized in the reported work.

关键词： Application software Education courses Educational programs Internet Computer science education Computer aided instruction Computer applications Process planning Informatics Product development

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