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

作者： Hongbin Li Wei Sun P. Stoica Jian Li Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA Department of Systems and Control University of Uppsala Uppsala Sweden Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

We previously studied amplitude estimation of one-dimensional (1D) sinusoidal signals from measurements corrupted by possibly colored observation noise (see Stoica, P. et al., IEEE Trans. on Sig. Proc., vol. 48, p.338-52, 2000). We extend those results for two-dimensional (2D) amplitude estimation. In particular, we investigate the 2D sinusoidal amplitude estimation within the general frameworks of least squares (LS), weighted least squares (WLS), and MAtched FIlterbank (MAFI) estimation. A variety of 2D amplitude estimators are presented, which are all asymptotically statistically efficient. The performances of these estimators in finite samples are compared numerically with one another. Making use of amplitude estimation techniques, we introduce a new scheme for 2D system identification, which is shown to be computationally simpler and statistically more accurate than the conventional output error method (OEM), when the observation noise is colored.

关键词： Amplitude estimation System identification Noise level Least squares approximation Colored noise Additive noise Frequency estimation Application software Sun control systems

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Active suspension design based on mixed uncertainty modelling 6

Active suspension design based on mixed uncertainty modellin...

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6th European control Conference, ECC 2001

作者： Gaspar, P. Szaszi, I. Balas, G.J. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 Budapest Hungary Department of Control and Transport Automation Budapest University of Technology and Economics Muegyetem rkp. 3 Budapest Hungary Department of Aerospace Engineering and Mechanics University of Minnesota 107 Akerman Hall 110 Union St. SE MN United States

ISBN: (纸本)9783952417362

This paper proposes the mixed lì synthesis for active suspension problems. With this method, a robust compensator that achieves nominal performance and meets robust stability specifications can be designed. Moreover, both the real parametric and the complex uncertainties are treated together, which usually yields a less conservative compensator than the traditional robust methods. In this paper, the design strategy is applied for active suspension, which involves real parametric uncertainties. The results are compared with the traditional LQG, complex lì and mixed lì methods. © 2001 EUCA.

关键词： Robust control

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Robust PI and PID controllers including Smith predictor structure

Robust PI and PID controllers including Smith predictor stru...

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American control Conference (ACC)

作者： B. Kristiansson B. Lennartson Department of Electrical and Computer Engineering Chalmers Lindholmen Goteborg Sweden Department of Signals and Systems Control and Automation Laboratory Chalmers University of Technology Goteborg Sweden

In this paper PI and PID controllers augmented by a Smith predictor structure are compared to ordinary PI and PID controllers, for plants with medium and great time delays. The comparison is based an a systematic evaluation method, where both robustness and performance aspects in different frequency regions are taken into account. The results show that a Smith predictor increases performance somewhat for a PID controller when the time delay is moderate. For great time delays, however, the improvement is insignificant. An important remark is that it is necessary to include the predictor structure in the design to get acceptable robustness properties. For a PI controller the benefits from a predictor are mostly small or negligible independent of time delay. Most important is, however that a derivative part obviously will bring significantly greater improvement than a Smith predictor to a system with a PI controller. This result is somewhat surprising, since Smith predictors are normally used together with PI and not with PID controllers. Furthermore, it is sometimes argued that it is no use to include derivative action for plants with significant time delay.

关键词： Robust control Three-term control control systems Delay effects Automatic control Frequency Robustness Robust stability Automation Pi control

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On some aspects of discrete equivalents of differential linear repetitive processes

On some aspects of discrete equivalents of differential line...

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IEEE Conference on Decision and control

作者： J. Gramacki A. Gramacki K. Galkowski E. Rogers D.H. Owens Department of Electronics and Computer Science University of Zielona Góra Poland Department of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

ISBN: (纸本)0780370619

Differential linear repetitive processes are a distinct sub-class of 2D continuous-discrete linear systems which pose problems that cannot (except in a few very restrictive special cases) be solved by the direct application of standard (1D) systems theory and hence by the direct use of a large number of currently-available tools for computer-aided analysis/design. One such area is the construction of discrete approximations to their dynamics. In this paper, we investigate some problems which arise during the discretization of differential linear repetitive processes and develop solutions to them.

关键词： computer science Linear systems computer aided analysis Orbital robotics Robotics and automation Software engineering Automatic control systems engineering and theory Stability

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BIFURCATION control AND NONSMOOTH FEEDBACK

BIFURCATION CONTROL AND NONSMOOTH FEEDBACK

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第二十届中国控制会议

作者： Hua O.Wang Yiguang Hong Laboratory for Intelligent and Nonlinear Control(LINC)Department of Electrical and Computer Engineering Duke University DurhamNC 27708U.S.A and Center for Nonlinear and Complex Systems Dept.of Control Science and Engineering Huazhong University of Science and Technology Institute of Systems Sciences Chinese Academy of Sciences

In the paper,we exhibit the usefulness of nonlinearity in two aspects:analysis of nonlinear dynamics and nonsmooth feedback *** illustrative examples are given to show how the new bifurcation p

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Reducing OS overhead for real-time industrial controllers with adjustable timer resolution

Reducing OS overhead for real-time industrial controllers wi...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Tae Rim Park Jae Hyun Park Wook Hyun Kwon Control Information Systems Laboratory School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea Real-time Embedded Systems Laboratory School of Information and Communication Engineering Inha University Incheon South Korea

ISBN: (纸本)0780370902

In this paper, a new method, named adjustable timer resolution (ATR) is proposed to control tasks in a timely manner, with enhanced performance on real-time operating systems. It prevents useless execution of the timer interrupt service routine (ISR). Features of the proposed method are compared with the conventional method, and the schedulability is analyzed to estimate the performance. As an implementation model, uC/OS-II is modified and ported to a power PC processor system. The metrics and results of the model are presented and discussed.

关键词： Industrial control Real time systems control systems Operating systems Communication system control Performance analysis Embedded system Processor scheduling Power system modeling Time factors

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A Novel Robot Vision Employing a Silicon Retina

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Journal of Robotics and Mechatronics 2001年第6期13卷 614-620页

作者： Shimonomura, Kazuhiro Kameda, Seiji Ishii, Kazuo Yagi, Tetsuya Faculty of Computer Science and Systems engineering Kyushu Institute of Technology Fukuoka Japan Department of Electronic Engineering Graduate School of Engineering Osaka University Osaka Japan Control Engineering and Science Department at Kyushu Institute of Technology Berkeley Japan Graduate School of Engineering Osaka University Berkeley Japan

A Robot vision system was designed using a silicon retina, which has been developed to mimick the parallel circuit structure of the vertebrate retina. The silicon retina used here is an analog CMOS very large-scale integrated circuit, which executes Laplacian-Gaussian like filtering on the image in real time. The processing is robust to change of illumination condition. Analog circuit modules were designed to detect the contour from the output image of the silicon retina and to binarize the output image. The images processed by the silicon retina as well as those by the analog circuit modules are received by the DOS/V-compatible mother-board with NTSC signal, which enables higher level processings using digital image processing techniques. This novel robot vision system can achieve real time and robust processings in natural illumination condition with a compact hardware and a low power consumption. © 2001, Fuji Technology Press. All rights reserved.

关键词： Field programmable gate arrays (FPGA)

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A volterra operator approach to the stability analysis of a class of 2D linear systems

A volterra operator approach to the stability analysis of a ...

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European control Conference (ECC)

作者： M. Dymkov I. Gaishun K. Galkowski E. Rogers D. H. Owens Institute of Mathematics National Academy of Sciences of Belarus Institute of Control and Computation Engineering Technical University of Zielona Gora Poland Department of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

Repetitive processes are a distinct class of 2D systems of both practical and theoretical interest. Their essential characteristic is repeated sweeps, termed passes, through a set of dynamics defined over a finite duration with explicit interaction between the outputs, or pass profiles, produced as the process evolves. Experience has shown that these processes cannot be studied/controlled by direct application of existing theory (in all but a few very restrictive special cases). This fact, and the growing list of applications areas, has prompted an on-going research programme into the development of a `mature' systems theory for these processes for onward translation into reliable generally applicable controller design algorithms. It has long been considered that Volterra operator techniques should have a key role to play in this general area. In this paper, we first present the necessary properties of a Volterra operator representation for the very important sub-class of so-called discrete linear repetitive processes and then use them to develop a characterization of stability in this setting.

关键词： Stability analysis Process control Equations Europe Vectors control theory

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Characterization of IGCT under zero-current-transition condition

Characterization of IGCT under zero-current-transition condi...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： K. Motto B. Zhang A.Q. Huang Power/Control Systems Northrop Grumman Corporation Sykesville MD USA Center for Power Electronics Systems The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

This paper characterizes the integrated gate commutated thyristor (IGCT) device under the zero-current-transition (ZCT) soft switching condition for the first time. The test results show that ZCT soft switching can dramatically reduce the turn-off loss, turn-on loss of the IGCT switch and also alleviate the reverse recovery stress of the diode. The ZCT circuit is therefore suitable for increasing the current handling capabilities of IGCT devices.

关键词： Switches Switching circuits Thyristors Inverters Circuit testing Resonance Zero voltage switching RLC circuits Fault currents Stress

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On simulation based analysis and synthesis of hierarchical network sturctures 6

On simulation based analysis and synthesis of hierarchical n...

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6th European control Conference, ECC 2001

作者： Tanevska, Dijana J. Dimirovski, Georgi M. Stankovski, Mile J. Jing, Yuanwei Makedonski Telekomunikacii AD Orce Nikolov Str. b.b. SkopjeMK-91000 Macedonia Inst. of Automation and Systems Engg. Faculty of Electrical Engg. SS Cyril and Methodius University SkopjeMK-1000 Macedonia Department of Computer Engg. Faculty of Engineering DOGUS University Kadikoy-IstanbulTR-81010 Turkey Dept. of Automatic Control and Control Eng. School of Information Science and Engineering Northeastern University Shenyang Liaoning110006 China

ISBN: (纸本)9783952417362

Analysis of complex systems such as hierarchically structured network systems that are employed in modelling and analysis various aspects and issues of control and management in telecommunications is investigated. Theory of graphs and binary matrices appear to be most suitable tools for modelling the overall structure of complex systems, in general, and of systemic hierarchies, in particular. A systematic methodology has been developed for computer simulation analysis and detecting general hierarchies in communications networking as well as for synthesis of system hierarchies. This methodology is an improved extension of Warfield's technique. © 2001 EUCA.

关键词： Discrete event simulation

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