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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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A family-oriented software development process for engine controllers

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Lecture Notes in computer Science

作者： Allenby, Karen Burton, Simon Buttle, Darren McDermid, John Murdoch, John Stephenson, Alan Bardill, Mike Hutchesson, Stuart Rolls-Royce University Technology Centre in Systems and Software Engineering Department of Computer Science University of York YorkYO10 5DD United Kingdom Rolls-Royce Plc Control Systems SinC-3 P.O. Box 31 Moor Lane DerbyDE24 8BJ United Kingdom

ISBN: (纸本)3540425713

This paper presents a software engineering process that includes family-based aspects for aero-engine control software. The process uses a "family capability" derived from family analysis of the embedding system. This analysis allows reuse capability to be designed into the process by exploiting prior knowledge of the differences between members of an engine family. The process described follows the traditional software lifecycle. However, the nature of the stages is modified to incorporate the use of the family capability, essentially to allow systematic application of both compositional and generational reuse throughout the development process. The process described was evaluated on a trial project to develop, and subsequently modify, a thrust reverser system for a small aero-engine. Initial results show that this process can reduce effort for both initial and subsequent developments through the use of the family capability. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Engines

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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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Multiple time scale sliding mode control of reusable launch vehicles in ascent and descent modes

Multiple time scale sliding mode control of reusable launch ...

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American control Conference (ACC)

作者： Yu.B. Shtessel C.E. Hall Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA Control Engineers Space Transportation Directorate Vehicle and Systems Development Department NASA/MSFC AL USA

A reusable launch vehicle control problem during ascent and descent is addressed via multiple-time scaled continuous sliding mode control. The proposed sliding mode controller utilizes a two-loop structure and provides robust decoupled tracking of both orientation angle command profiles and angular rate command profiles in the presence of bounded external disturbances and plant uncertainties, including aerodynamic surfaces and engine failures. Sliding mode control causes the angular rate and orientation angle tracking error dynamics to be constrained to linear, decoupled, homogeneous, and vector valued differential equations with desired eigenvalues. The dual-time scale sliding mode controller was designed for the X-33 technology demonstration sub-orbital launch vehicle in the ascent and descent modes. Simulation results show that the designed controller provides robust, accurate, decoupled tracking of the orientation angle command profiles in ascent and descent in presence of external disturbances and vehicle inertia uncertainties. The designed robust controller is to significantly reduce the time and cost associated with flying to new orbits, with new payloads, and with modified vehicles.

关键词： Sliding mode control Robust control Uncertainty Aerodynamics Engines Error correction Vehicle dynamics Vectors Differential equations Eigenvalues and eigenfunctions

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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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Nonlinear control of a pneumatic muscle actuator: backstepping vs. sliding-mode

Nonlinear control of a pneumatic muscle actuator: backsteppi...

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IEEE Conference on control Technology and Applications (CCTA)

作者： P. Carbonell Z.P. Jiang D.W. Repperger Department of Systems Engineering and Control Polytechnic University of Valencia Alcoy Spain Department of Electrical and Computer Engineering Six Metrotech Center Polytechnic University Brooklyn NY USA Air Force Research Laboratory OH USA

This paper weighs up the pros and cons of three different tracking controllers for a pneumatic muscle actuator: robust backstepping, adaptive backstepping and sliding-mode. Robustness is assured for three controllers in the presence of model uncertainties and external perturbations. Ultimate boundedness is proved for the robust and adaptive backstepping tracking controller. Exponential stability is proved for the sliding-mode tracking controller. The tracking is well achieved by the sliding-mode and the adaptive controller. On the contrary, the robust backstepping shows a noticeable tracking error. The sliding-mode leads to a high-frequency switching control law.

关键词： Muscles Pneumatic actuators Backstepping Sliding mode control Robust control Programmable control Adaptive control Uncertainty Stability Robustness

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Refinement of balancing order reduction techniques using Kessler's formula

Refinement of balancing order reduction techniques using Kes...

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American control Conference (ACC)

作者： Z. Gajic M. Lelic Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA Advanced Control Systems Photonic Technologies Corning Inc.orporated Corning NY USA

We present a methodology using Kessler's formula that potentially improves the system order reduction techniques based on system balancing. The formula is simple and easy to use. We show how to refine the balancing order reduction techniques for single-input single-output systems by using Kessler's formula that produces the equivalent time constant of the neglected part of the system. Using Kessler's formula all the neglected stable system time constants, either fast or slow, can be approximated by only one time constant, which preserves valuable information about the neglected part of the system. The balancing truncation and residualization techniques can be improved by adding in parallel a first order equivalent fast system that approximates the neglected fast dynamics, and the reversed residualization techniques can be improved by adding in parallel a first-order slow system that approximates the neglected slow subsystem.

关键词： control systems Linear systems Transfer functions Poles and zeros Observability controllability Reduced order systems Three-term control Frequency Steady-state

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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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Robust H/spl infin/ filter design for uncertain linear systems with multiple time-varying state delays

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IEEE Transactions on Signal Processing 2001年第3期49卷 569-576页

作者： C.E. de Souza R. Martinez Palhares P.L. Dias Peres Department of Systems and Control Laboratorio Nacional de Computacao Cientifica Petropolis Brazil Graduate Program in Electrical Engineering Pontifical Catholic University of Minas Gerais Belo Horizonte Brazil School of Electrical and Computer Engineering State University of Campinas-UNICAMP Campinas Brazil

The problem of robust H/spl infin/ filtering for continuous-time uncertain linear systems with multiple time-varying delays in the state variables is investigated. The uncertain parameters are supposed to belong to a given convex bounded polyhedral domain. The aim is to design a stable linear filter assuring asymptotic stability and a prescribed H/spl infin/ performance level for the filtering error system, irrespective of the uncertainties and the time delays. Sufficient conditions for the existence of such a filter are established in terms of linear matrix inequalities, which can be efficiently solved by means of powerful convex programming tools with global convergence assured. An example illustrates the proposed methodology.

关键词： Robustness Nonlinear filters Linear systems Filtering Time varying systems Asymptotic stability Uncertainty Delay effects Sufficient conditions Linear matrix inequalities

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