检索结果-内蒙古大学图书馆

Advanced Textbooks in control and Signal Processing 2007年第9781846288722期 ix-xii页

作者： Hrúz, Branislav Zhou, Mengchu Department of Automatic Control Systems Faculty of Electrical Engineering and Information Technology Slovak University of Technology Bratislava 1812 19 Slovakia Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

来源：评论

学校读者我要写书评

暂无评论

An Improved Synchronous Reference Frame Method for Active Filters

An Improved Synchronous Reference Frame Method for Active Fi...

引用

EUROCON 2007 - The International Conference on " computer as a Tool" (EUROCON 2007), vol.3

作者： G. D. Marques V. Fernao Pires Mariusz Malinowski Marian Kazmierkowski Department of Electrical and Computer Engineering IST TU Lisbon Lisboa Portugal Department of Electrical Engineering ESTS Instituto Politécnico de Setúbal Setubal Portugal Universidade Técnica de Lisboa Portugal Institute of Control and Industrial Electronics Warsaw University of Technology Warsaw Poland

Active filters are used to eliminate current harmonics near nonlinear loads. This paper presents a new method for the evaluation of the current that should be injected by the active filter in order to eliminate harmonics. The method proposed is based on the Synchronous Reference Frame method and explores the fact that the performance of the active filter depends on the speed of the system that determines the rotating reference frame, but doesn't depend on its position. Compared with other methods, this method presents some advantages, due to its simplicity and its rudeness to perturbations on the ac network. Normally active filters have poor performances under non symmetrical and non-sinusoidal voltage conditions. The method proposed in this paper presents good response in presence of harmonics on the ac mains voltages and in presence of imbalance.

关键词： Active filters Synchronous Reference Frame Power Quality Harmonics Imbalance

来源：评论

学校读者我要写书评

暂无评论

Nondestructive Evaluation of Strain Distribution and Fatigue Distribution from Austenitic Stainless Steel by Using Magnetic Sensors

引用

AIP Conference Proceedings 2007年第1期894卷

作者： Y. Tsuchida M. Oka T. Yakushiji M. Enokizono Department of Electrical and Electronic Engineering Oita University 700 Dannoharu Oita 870‐1192 Japan Department of Computer and Control Engineering Oita National College of Technology 1666 Maki Oita 870‐0152 JAPAN

Austenitic stainless steel transforms from austenitic crystal structure to martensitic crystal structure after applying strain or stress. Because martensitic crystal structures have magnetization, strain evaluation and fatigue evaluation can be performed by measuring magnetic properties. This paper describes the measurement of leakage magnetic flux density of remanent magnetization for the strain evaluation and the fatigue evaluation by a typical Hall element sensor for SUS 304 and SUS 304L and by a high‐sensitivity thin‐film flux‐gate magnetic sensor for SUS 316 and SUS 316L.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Spectral Analysis of Signals: The Missing Data Case

引用

2006年

作者： Yanwei Wang Jian Li Petre Stoica

ISBN: (数字)9781598290011

Spectral estimation is important in many fields including astronomy, meteorology, seismology, communications, economics, speech analysis, medical imaging, radar, sonar, and underwater acoustics. Most existing spectral estimation algorithms are devised for uniformly sampled complete-data sequences. However, the spectral estimation for data sequences with missing samples is also important in many applications ranging from astronomical time series analysis to synthetic aperture radar imaging with angular diversity. For spectral estimation in the missing-data case, the challenge is how to extend the existing spectral estimation techniques to deal with these missing-data samples. Recently, nonparametric adaptive filtering based techniques have been developed successfully for various missing-data problems. Collectively, these algorithms provide a comprehensive toolset for the missing-data problem based exclusively on the nonparametric adaptive filter-bank approaches, which are robust and accurate, and can provide high resolution and low sidelobes. In this book, we present these algorithms for both one-dimensional and two-dimensional spectral estimation problems.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Pulse method measurements for determination of line fault location

引用

Archives of electrical engineering 2006年第217-218期55卷 301-312页

作者： Tarczyński, WiesLaw Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

This article presents an analysis of how pulses in the long two-conductor coupled lines with conductor screened interact mutually. The interaction of pulses appears in those places of the line, where there is a change of wave impedance causing a change in reflection coefficient for pulses moving along the line. An exemplary analysis is performed for a homogenous lossless line at its starting and terminal points. The results of analysis are analytical expressions describing quantitative interactions of pulses. The expressions are verified both by computer simulation and by measurements of the real line. There has been performed the analysis of influence of the resistances with which the terminal points of the line are loaded onto the amplitude value of the pulses registered at the starting point of the line. The new method and the new system of measurements of pulses have been proposed that minimize the interaction of pulses at the starting point of the line, disadvantageous for the process of fault location by using pulse method.

关键词： Electric fault currents

来源：评论

学校读者我要写书评

暂无评论

Determination of regulation characteristics of switched reluctance motors for quasi-optimal operation

引用

Archives of electrical engineering 2006年第217-218期55卷 313-324页

作者： Tomczewski, Krzysztof Wach, Piotr Faculty of Electrical Engineering Automatic Control and Computer Science Opole University of Technology

The paper presents regulation characteristics that fulfill the requirements of highest possible efficiency and strongly reduced torque ripple level. For switched reluctance motors it is not so simple and obvious, because the regulation characteristics depend on three variables: phase voltage, switch-on and switch-off angles. For this reason in a steady state the same operation point (Tl, ω) of the mechanical characteristic is attainable for quite different values of those control parameters. So there is a field for quasi-optimal operation and the choice of the coresponding control parameters is the main subject of this work. The paper presents also the method to determine these quasi-optimal control characteristics from simple tests or from computations based on presented simple mathematical model.

关键词： Reluctance motors

来源：评论

学校读者我要写书评

暂无评论

Workshop on imaging science development for cancer prevention and preemption

引用

Cancer Biomarkers 2007年第1期3卷 1-33页

作者： Kelloff, Gary J. Sullivan, Daniel C. Baker, Houston Clarke, Lawrence P. Nordstrom, Robert Tatum, James L. Dorfman, Gary S. Jacobs, Paula Berg, Christine D. Pomper, Martin G. Birrer, Michael J. Tempero, Margaret Higley, Howard R. Petty, Brenda Gumbs Sigman, Caroline C. Maley, Carlo Sharma, Prateek Wax, Adam Ginsberg, Gregory G. Dannenberg, Andrew J. Hawk, Ernest T. Messing, Edward M. Grossman, H. Barton Harisinghani, Mukesh Bigio, Irving J. Griebel, Donna Henson, Donald E. Fabian, Carol J. Ferrara, Katherine Fantini, Sergio Schnall, Mitchell D. Zujewski, Jo Anne Hayes, Wendy Klein, Eric A. DeMarzo, Angelo Ocak, Iclal Ketterling, Jeffrey A. Tempany, Clare Shtern, Faina Parnes, Howard L. Gomez, Jorge Srivastava, Sudhir Szabo, Eva Lam, Stephen Seibel, Eric J. Massion, Pierre McLennan, Geoffrey Cleary, Kevin Suh, Robert Burt, Randall W. Pfeiffer, Ruth M. Hoffman, John M. Roy, Hemant K. Wang, Thomas Limburg, Paul J. El-Deiry, Wafik S. Papadimitrakopoulou, Vali Hittelman, Walter N. MacAulay, Calum Veltri, Robert W. Solomonzz, Diane Jeronimo, Jose Richards-Kortum, Rebecca Johnson, Karen A. Viner, Jaye L. Stratton, Steven P. Rajadhyaksha, Milind Dhawan, Atam NIH/NCI/DCTD Cancer Imaging Program Bethesda MD United States NIH/NCI/DCTD Cancer Imaging Program NCI-Frederick Frederick MD United States NIH/NCI/DCP Early Detection Research Group Bethesda MD United States The Johns Hopkins University School of Medicine Departments of Radiology Pharmacology and Oncology Division of Neuroradiology Baltimore MD United States NIH/NCI/CCR Cell and Cancer Biology Branch Bethesda MD United States University of California San Francisco Department of Medicine Division of Medical Oncology San Francisco CA United States CCS Associates Inc. Mountain View CA United States Wistar Institute Molecular and Cellular Oncogenesis Program Philadelphia PA United States University of Kansas School of Medicine VA Hospital Kansas City MO United States Duke University Department of Biomedical Engineering Medical Physics Program Durham NC United States University of Pennsylvania School of Medicine Department of Gastroenterology Philadelphia PA United States New York Presbyterian Hospital Weill Medical College of Cornell University New York NY United States NIH/NCI/OD Office of Centers for Training and Resources Bethesda MD United States University of Rochester Medical Center Department of Urology Rochester NY United States University of Texas MD Anderson Cancer Center Department of Urology Houston TX United States Massachusetts General Hospital Abdominal Imaging/Interventional Radiology Boston MA United States Boston University Biomedical Engineering Electrical and Computer Engineering and Physics Boston MA United States NIH/NCI/DCP Gastrointestinal and Other Cancers Research Group Bethesda MD United States The George Washington University Cancer Institute Office of Cancer Prevention and Control Washington DC United States University of Kansas Cancer Center Clinical Oncology Kansas City KS United States University of California Davis Department of Biomedical Engineering Davis CA United States Tufts University De

The concept of intraepithelial neoplasm (IEN) as a near-obligate precursor of cancers has generated opportunities to examine drug or device intervention strategies that may reverse or retard the sometimes lengthy process of carcinogenesis. Chemopreventive agents with high therapeutic indices, well-monitored for efficacy and safety, are greatly needed, as is development of less invasive or minimally disruptive visualization and assessment methods to safely screen nominally healthy but at-risk patients, often for extended periods of time and at repeated intervals. Imaging devices, alone or in combination with anticancer drugs, may also provide novel interventions to treat or prevent precancer.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Velocity control of electric propulsion space vehicles using heliocentric gravitational sling

Velocity control of electric propulsion space vehicles using...

引用

2006 World Automation Congress, WAC'06

作者： Reddy, Bandi Bharat Kumar Homaifar, Abdullah Esterline, Albert C. Autonomous Control and Information Technology Center Department of Electrical and Computer Engineering North Carolina A and T State University United States

ISBN: (纸本)1889335339

The objective of this research is to determine a near optimal fuel efficient control strategy for an electric propulsion space vehicle to attain a predefined velocity at the target. The control strategy is represented as a chromosome and micro genetic algorithms are used to find the best solution. The control strategy uses me space vehicle's reverse thrust and the sling effect caused by the Sun. Copyright - World Automation Congress (WAC) 2006.

关键词： Aerospace vehicles

来源：评论

学校读者我要写书评

暂无评论

Linear time-varying filter with variable bandwidth

Linear time-varying filter with variable bandwidth

引用

ISCAS 2006: 2006 IEEE International Symposium on Circuits and Systems

作者： Heyoung, Lee Zeungnam, Bien Department of Control and Instrumentation Engineering Seoul National University of Technology Seoul Korea Republic of Department of Electrical and Computer Science KAIST Daejon Korea Republic of

ISBN: (纸本)0780393902

A linear time-varying filter with the characteristic of variable bandwidth is proposed for noise reduction of signals with time-varying bandwidth and decomposition of multicomponent signals into components. The proposed filters are composed of constant coefficients and differential operators with a time-varying coefficient. Frequency analysis of the proposed filter is given. Also, the compensation of time-varying delay due to linear phase is discussed. ©2006 IEEE.

关键词： Wave filters

来源：评论

学校读者我要写书评

暂无评论

On the Impact of Plant Model and controller Sophistication on Performance of Disturbance Attenuation and System Robustness

On the Impact of Plant Model and Controller Sophistication o...

引用

IEEE Conference on Decision and control

作者： M. J. Blachuta G. Bialic Department of Automatic Control Silesian Technical University Gliwice Poland Department of Electrical Engineering Automatic Control and Computer Science Technical University of Opole Opole Poland

ISBN: (纸本)1424401704;9781424401703

In the paper the problem of disturbance attenuation performance in single-loop control system is investigated. Modified MV control strategy with bounded control variance is used as benchmark for both LQG and classically and optimally tuned PID-type controllers. Certain time and frequency domain functions are then examined to further assess the control performance in terms of robustness. It has been shown that as long as the system to be controlled is delay-free, and there is no extreme demand on performance, simple lag-delay system model along with optimally tuned PID control algorithm provides control quality similar to that of LQG controlled original system assuming the same bound on control signal variance. Although the classical performance measure based on substitute delay indicates then almost optimal performance, there is still room for additional improvement that can be attained using both PID and LQG controllers and more sophisticated original delay-free model. The price paid is much larger control variance. It is interesting to note that while LQG systems remain robust this is not longer valid for PID controllers

关键词： Attenuation Robust control Optimal control Delay Three-term control control systems Automatic control control system synthesis Performance analysis USA Councils

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：