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Computationally efficient method of simulation of an electric drive impact on the power grid

Archives of Electrical Engineering 2013年第1期62卷 77-90页

作者： Beniak, Ryszard Gardecki, Arkadiusz Opole University of Technology Faculty of Electrical Engineering Automatic Control and Computer Science Sosnkowskiego 31 45-272 Opole Poland

This paper presents a computationally efficient method for modelling an impact of the converter drive on the power grid. The formalized variable structure method (FVSM) allows for comprehensive studies of the effect on the power grid and examining the relation between this effect and the number of drive and feeding line parameters. In order to obtain a comprehensive model along with the model of the power grid, the parameters that are applied originate from a drive of a coal-fired power station. These parameters have been determined based on assessment and estimation. The estimation process was conducted with the aid of a model that allows for the commutation of power electronic elements. The authors confirmed that the model was correct by comparing empirical and theoretical voltage and current waveforms. Harmonic content of the voltage and current in the power grid which feeds the drive are considered to be the measure of the converter drive impact on the power grid. The standard method for the reduction of a harmonic content in the voltage and current involves the application of line reactors and distribution or converter transformers. As an example, the authors determine the impact of the drive on the power grid with respect to the adopted parameters of the line reactor. This example presents FVSM abilities with regard to simulation of complex systems that contain power grid components and converter drives.

关键词： Electric drives

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Robot telemanipulation system

Robot telemanipulation system

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International Conference on System Theory, control, and Computing (ICSTCC)

作者： Vlad Ciobanu Nirvana Popescu Adrian Petrescu Martin Noeske Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest Romania Department of Informatics University of Hamburg Hamburg Germany

The article presents a solution for the teleoperation of a robot hand and arm designed as a complex system that captures human motion and controls the robot into mimicking the human actions. This hybrid system allows the robot execution to be guided by human actions, therefore decreasing the planning complexity and allowing the robot to perform more complex movements and to use the human capacity of adapting to unexpected situations.

关键词： Joints Kinematics Robot sensing systems Wrist Thumb

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Ultrasound testing of metallic structures using a dual symmetric path inspection and a matched filter-based method

Ultrasound testing of metallic structures using a dual symme...

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IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing (CAMSAP)

作者： Costin Vasile Petrut Teodor-Ion Cornel Ioana Valentin Sgârciu Jérôme Mars Ion Candel Faculty of Automatic Control and Computer Science University Politehnica of Bucharest Bucharest ED Romania Gipsa-lab Grenoble Institute of Technology France

In this paper, we present a new technique for detecting and localising defects in metallic structures, using ultrasound non-destructive inspection. This technique consists in applying a dual path inspection and the matched filter to a stepped frequency-type signal. This new technique is compared with classical non-destructive testing approaches. An experimental setup is presented that allows us to validate the proposed method.

关键词： Ultrasonic imaging Inspection Matched filters Time-frequency analysis Frequency modulation Steel

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Cloud-based application development platform for secure, intelligent, interlinked and interactive infrastructure

Cloud-based application development platform for secure, int...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Dorel Nasui Valentin Sgarciu Alexandra Cernian American International Radio Inc. IL USA Faculty of Automatic Control and Computer Science Bucharest University Politehnica of Bucharest Romania

This paper presents a cloud-based secure, intelligent, interlinked and interactive application development platform that is able to collect and transmit information from a variety of data sources across multiple wireless communication systems. The platform is called S4I and it is based on a three layer scalable architecture, facilitating communication interoperability. Web-based applications, hosted on cloud servers, can be developed and customized according to the client's needs and accessed by the end user from anywhere in the world. The S4I platform brings major achievements to the wireless cloud-based communication and interoperability.

关键词： computer architecture Servers Wireless communication Interoperability Artificial intelligence Cloud computing Transportation

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Development of parallel manipulator sit to stand assistive device for elderly people

Development of parallel manipulator sit to stand assistive d...

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2013 IEEE Workshop on Advanced Robotics and Its Social Impacts, ARSO 2013

作者： Salah, Omar Asker, Ahmed Fath El-Bab, Ahmed M. R. Assal, Samy M. F. Ramadan, Ahmed A. Sessa, Salvatore Abo-Ismail, Ahmed Egypt-Japan University of Science and Technology New Borg-El-Arab city Alexandria Egypt Mechanical Engineering Department Faculty of Engineering Assiut University Egypt Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Alexandria Egypt Computer and Automatic Control Dept. Faculty of Engineering Tanta University Tanta Egypt Mechatronics and Robotics Dept. Egypt-Japan University of Science and Technology Egypt School of Creative Science and Engineering Waseda University Tokyo 168-8480 Japan

ISBN: (纸本)9781479923694

This paper describes a novel mobility assistive device under development in the Egypt-Japan University of science and Technology (E-JUST). The proposed system can help patients who do not have enough physical strength on the lower limbs during sit to stand due to aging, diseases such as polymyositis and myopathy, and joint replacement surgery complications. It can follow the natural pattern of human motion during sit to stand providing assistance force under the shoulder. The overall device is compact and employees a parallel mechanism which provide more stiffness. Several experiments were carried out in a VICON room to calculate the human motion posture while sit to stand motion in addition estimate the trajectory of the end effector during assisting. computer simulation was built to verify the performance of the proposed system with the reference trajectory. © 2013 IEEE.

关键词： Mechanisms

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Estimation of nonstationary harmonic signals and its application to active control of MRI noise

Estimation of nonstationary harmonic signals and its applica...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Maciej Niedźwiecki Michał Meller Yoshinobu Kajikawa Dawid Łukwiński Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Gdańsk University of Technology Gdansk Poland Department of Electrical and Electronic Engineering Faculty of Engineering Science Kansai University Suita Osaka Japan

A new adaptive comb filtering algorithm, capable of tracking the fundamental frequency and amplitudes of different frequency components of a nonstationary harmonic signal embedded in white measurement noise, is proposed. Frequency tracking characteristics of the new scheme are studied analytically, proving (under Gaussian assumptions and optimal tuning) its statistical efficiency for quasi-linear frequency changes. Laboratory tests show that the proposed algorithm can be successfully used for active control of MRI noise.

关键词： Noise Harmonic analysis Magnetic resonance imaging Adaptation models Signal processing algorithms Estimation Power harmonic filters

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QUESTOR -- automatic Searching for Reports

QUESTOR -- Automatic Searching for Reports

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International Conference on control Systems and computer science (CSCS)

作者： Andrei Vasilateanu Nicolae Goga Tudor Sutu Marius Nastasescu Alin Moldoveanu Victor Asavei Cristian Taslitchi Faculty of Engineering in Foreign Languages University POLITEHNICA of Bucharest Romania Romania Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Romania Info World Romania Romania

ISBN: (纸本)9781467361408

Vast arrays of reporting are nowadays in use, allowing ever increasing flexibility and control over the displayed results. However, as IT developed and became available to all business domains, the number of reports used by companies started to challenge the possibility of good management. The European funded project Questor aims to create a revolutionary product that will eliminate the complexities inherent in the report management workflow. The motivation of this project is to substitute the time consuming manual search for information in reports with an automatic one. The final purpose is to make querying the report database as simple as addressing a question in natural language. This paper gives an overview over the concept of the Questor project, its software architecture and its preliminary results.

关键词： Servers Ontologies Engines Semantics Databases Natural languages Surgery

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The influence of ultrasound signal parameters on sonoluminescence light intensity

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Archives of Electrical Engineering 2013年第4期62卷 605-612页

作者： Szmechta, Marek Boczar, Tomasz Zmarzly, Dariusz Faculty of Electrical Engineering Automatic Control and Computer Science Institute of Electric Power Engineering Opole University of Technology Prószkowska 76 45-758 Opole Poland

Topics of this article concern the study of the fundamental nature of the sonoluminescence phenomenon occurring in liquids. At the Institute of Electrical Power Engineering at Opole University of Technology the interest in that phenomenon known as secondary phenomenon of cavitation caused by ultrasound became the genesis of a research project concerning acoustic cavitation in mineral insulation oils in which a number of additional experiments performed in the laboratory aimed to determine the influence of a number of acoustic parameters on the process of the studied phenomenona. The main purpose of scientific research subject undertaken was to determine the relationship between the generation of partial discharges in high-voltage power transformer insulation systems, the issue of gas bubbles in transformer oils and the generated acoustic emission signals. It should be noted that currently in the standard approach, the phenomenon of generation of acoustic waves accompanying the occurrence of partial discharges is generally treated as a secondary phenomenon, but it can also be a source of many other related phenomena. Based on our review of the literature data on those referred subjects taken, it must be noted, that this problem has not been clearly resolved, and the description of the relationship between these phenomena is still an open question. This study doesn't prove all in line with the objective of the study, but can be an inspiration for new research project in the future in this topic. Solution of this problem could be a step forward in the diagnostics of insulation systems for electrical power devices based on non-invasive acoustic emission method.

关键词： Sonoluminescence

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Texture Classification based on Succolarity

Texture Classification based on Succolarity

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Telecommunications Forum Telfor

作者： J. I. R. Cojocaru D. Popescu I. E. Nicolae Faculty of Automatic Control and Computer Science University Politehnica of Bucharest

ISBN: (纸本)9781479914180

Texture aspects are encountered in most domains that use image processing. Despite the decades of research on texture image information, texture characterization remains a competition for the scientific community because a rigorous mathematical definition of texture was not yet decided. Therefore, texture analysis and classification needs depth research and continuous improvement. Beside common fractal properties, this paper uses a modern fractal property which characterizes different texture descriptors for image analysis in order to provide additional information and to extract new texture features.

关键词： Fractal measure Image processing Succolarity Texture image

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Structured coprime factorizations description of Linear and Time-Invariant networks

Structured coprime factorizations description of Linear and ...

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IEEE Conference on Decision and control

作者： Şerban Săbau Cristian Oară Sean Warnick Ali Jadbabaie Stevens Institute of Technology Hoboken NJ US Faculty of the Automatic Control Dept. University “Politehnica” Bucharest Romania The Faculty of the Computer Science Department Brigham Young University Faculty of the Electrical and Systems Engineering Dept University of Pennsylvannia

In this paper we study state-space realizations of Linear and Time-Invariant (LTI) systems. Motivated by biochemical reaction networks, Gonçalves and Warnick have recently introduced the notion of a Dynamical Structure Functions (DSF), a particular factorization of the system's transfer function matrix that elucidates the interconnection structure in dependencies between manifest variables. We build onto this work by showing an intrinsic connection between a DSF and certain sparse left coprime factorizations. By establishing this link, we provide an interesting systems theoretic interpretation of sparsity patterns of coprime factors. In particular we show how the sparsity of these coprime factors allows for a given LTI system to be implemented as a network of LTI sub-systems. We examine possible applications in distributed control such as the design of a LTI controller that can be implemented over a network with a pre-specified topology.

关键词： Transfer functions Equations Indium phosphide Mathematical model Network topology Topology Electronic mail

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