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IEEE International Conference on systems, Man and Cybernetics

作者： T. Iwasaki S. Hara Department Control Systems Engineering Tokyo Institute of Technology Meguro Tokyo Japan Department of Intelligent Computer Systems Tokyo Institute of Technology Yokohama Japan

Provides insight into the design of controlled mechanical systems. Most conventional mechanical designs are based on requirements involving weights, stiffness, strength, and so forth. Which are not directly related to controlled performance. The objective of the paper is to identify mechanical (structural) properties that are critical for guaranteeing good controlled performance. In particular, we point out that the control bandwidth of a servo-tracking system achievable by a dynamic output feedback controller with reasonable amount of control effort, is closely related to the frequency range where the open-loop transfer function exhibits positive-realness. A finite frequency positive-real property is characterized in terms of linear matrix inequalities and structure design methods are proposed using the characterization.

关键词： control systems Open loop systems Frequency Mechanical systems Mechanical factors Bandwidth Output feedback Transfer functions Linear matrix inequalities Design methodology

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Lyapunov stability theory for linear repetitive processes - The 2D equation approach

Lyapunov stability theory for linear repetitive processes - ...

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1999 European control Conference, ECC 1999

作者： Benton, S.E. Rogers, E. Owens, D.H. Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783952417355

This paper develops the basis of a so-called 2D Lyapunov equation based approach to the stability analysis of discrete linear repetitive processes. The key feature of this equation is that, in contrast to the so-called ID Lyapunov equation approach, it is defined in terms of matrices with constant entries and has a 'similar' structure to the Lyapunov equation for standard, or ID, discrete linear systems. Here it is shown that the 2D Lyapunov equation gives, in general, a characterization of stability which is sufficient but not necessary. Despite this deficiency, it is also shown how the 2D Lyapunov equation can be used to characterize stability margins and robustness to uncertainty in the model description - very important topics for which few results are currently available. Some areas for short to medium term further research are also briefly noted. © 1999 EUCA.

关键词： Linear systems

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Amplitude estimation with application to system identification

Amplitude estimation with application to system identificati...

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

作者： P. Stoica Hongbin Li Jian Li Systems and Control Group University of Uppsala Uppsala Sweden Department of Electrical &. Computer Engineering University of Florida Gainesville FL USA

We investigate herein the problem of amplitude estimation of sinusoidal signals from observations corrupted by colored noise. A relatively large number of amplitude estimators are described which encompass least squares (LS) and weighted least squares (WLS) methods. Additionally, filterbank approaches, which are widely used for spectral analysis, are extended to amplitude estimation. Specifically, we consider the matched-filterbank (MAFI) approach and show that, by appropriately designing the prefilters, the MAFI approach includes the WLS approach. The amplitude estimation techniques discussed in this paper do not model the noise, and yet they are all asymptotically statistically efficient. It is their different finite-sample properties that are of particular interest to this study. Numerical examples are provided to illustrate the differences among the various estimators. Though amplitude estimation applications are numerous, we focus on system identification using sinusoidal probing signals.

关键词： Amplitude estimation System identification Noise level Colored noise Least squares methods Signal processing Noise reduction Discrete Fourier transforms Application software control systems

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Hybrid specification and implementation of an aircraft engine controller

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IFAC Proceedings Volumes 1999年第2期32卷 8734-8739页

作者： Julian M. Bass Mohamed S. Hajji Peter J. Fleming School of Electronic Engineering and Computer Systems University of Wales Bangor Dean Street Bangor Gwynedd UK Tel: + 44 (0)1248 382793 Fax: + 44 (0)1248 361429 Dept. of Automatic Control and Systems Engineering University of Sheffield UK

control of a gas-turbine engine requires management of continuous and discrete (state-event) behaviour. A design environment- the Development Framework, is used to define both the continuous and discrete aspects of a turbine engine controller. The approach uses purpose-built software translation tools to capture the system's specification from commercial simulation tools. A unified design model based on a data flow notation, comprising both continuous and state-event behaviour is automatically generated. Specification and design models of selected gas-turbine engine controller subsystems are presented. The complexity of the application suggests that the approach can be used for industrial scale projects.

关键词： continuous systems discrete-event systems design systems software specification software engineering

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Maintenance support systems incorporating networks

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Hitachi Review 1999年第5期48卷 252-259页

作者： Morita, Kiyonori Murakawa, Makoto Murao, Mitsuo Ota, Nobuyuki Hitachi Ltd. Social Systems Department Systems Engineering Division Hitachi Ltd. Information Engineering Department Power Transmission Division Hitachi Ltd. General Computer Systems Department Omika Control Division Hitachi Engineering Co. Ltd. Nuclear Power Plant Department

Recent years have seen progress in the introduction of information systems to support the administration of electrical facilities, and applications of information on operations and facilities is now becoming properly regulated. Advances in the areas of data processing technology and network technology are contributing to improvements in the functions of support systems. These technologies make possible both the processing of increased volumes of information and the transmission of a wide variety of information. They also address the needs of facilities administration by increasing the ease with which information is communicated between information processing sites, among other things. The procedures addressed by support systems can be divided into three categories: (1) Reporting on the state of facilities operations;(2) Planning for facilities installation and maintenance;and (3) Diagnostic and evaluative reviews of facilities. The "Information Collection System for Operations Sites" is a system and product supporting the reporting of the state of facilities operations. Utilizing multipurpose equipment, in addition to its basic functions of transmitting images and sounds from a site, the system is capable of having memos added to its images, and it is capable of accurately reporting the state of events at a site. Information databases used in planning for facilities installation and maintenance are effective in that they are able to have multifaceted and rapid examinations performed on them. Via the internal network of a power-generating station, the "General Maintenance Administration Support System" makes possible the administration of facilities, administration of work being performed, administration of construction, and administration of operations. There is a trend towards even further progress in the application of support systems to diagnostic and evaluative reviews of facilities. Under the "BWR Water Chemistry Management System," the results of diagnostic re

关键词： Information science

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Frequency domain analysis of B-spline interpolation

Frequency domain analysis of B-spline interpolation

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Z. Mihajlovic A. Goluban M. Zagar Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper describes B-spline interpolation and compares it with other reconstruction methods, especially in three-dimensional space. We first consider the B-spline bases in the terms of convolution in signal processing. The presented analysis requires careful usage of continuous and discrete representation of B-spline. Emphasis is given to the important difference between B-spline interpolation and approximation. The difference is shown through frequency domain analysis, so we derive frequency responses of the B-spline interpolation and approximation. We conclude by demonstrating the use of several reconstruction filters and appropriate gradient estimators in volume rendering. Exact reconstruction in volume visualization is very important in many industrial applications, such as material cavity control.

关键词： Frequency domain analysis Spline Interpolation Image reconstruction Convolution Filters Polynomials Data visualization Frequency response Microelectronics

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Receding horizon control of the Caltech ducted fan: a control Lyapunov function approach

Receding horizon control of the Caltech ducted fan: a contro...

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IEEE Conference on control Technology and Applications (CCTA)

作者： A. Jadbabaie Jie Yu J. Hauser Control and Dynamical Systems California Institute of Technology Pasadena CA USA Electrical and Computer Engineering University of Colorado Boulder CO USA

Deals with the application of receding horizon methods to the simplified model of a flight control experiment developed at Cal Tech. The dynamics of the system are representative of a vertical take off and landing (VTOL) aircraft, such as a Harrier around hover. The adopted control methodology is a hybrid of receding horizon techniques and control Lyapunov function (CLF) based ideas. First a CLF is found, and then, by using the CLF as the terminal cost in the receding horizon optimization, stability is guaranteed. It is shown that if the horizon length is long enough, a simple choice of CLF, i.e., the one obtained from Jacobian linearization of the dynamics at hover, will achieve a good performance. However, if due to computational costs, longer time horizons are not possible, stability can be guaranteed by applying the CLF obtained using quasi-LPV methods, as a terminal cost. Several numerical simulations for different time horizons are presented to illustrate the effectiveness of the discussed methods.

关键词： Lyapunov method Optimal control Stability Jacobian matrices Aircraft Cost function Computational efficiency Numerical simulation control design Equations

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Parameter estimation for harmonic sinusoidal signals

Parameter estimation for harmonic sinusoidal signals

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Asilomar Conference on Signals, systems & computers

作者： Hongbin Li P. Stoica Jian Li Department of Electrical and Computer Engineering Stevans 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

A Markov-like weighted least squares (WLS) estimator is presented herein for harmonic sinusoidal parameter estimation. The estimator involves two distinct steps whereby it first obtains a set of initial parameter estimates that neglect the harmonic structure by some standard sinusoidal parameter estimation technique, and then the initial parameter estimates are refined via a WLS fit. It is found that the proposed estimator achieves similar performance to the optimal nonlinear least squares method when the signal-to-noise ratio (SNR) is moderate or high, but at a significantly reduced computational complexity. Furthermore, the former is shown to have a lower threshold SNR than the latter.

关键词： Parameter estimation Power harmonic filters Cost function Least squares approximation Signal to noise ratio Gaussian noise Frequency Radar signal processing Maximum likelihood estimation control systems

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Performance limit: A μ -Synthesis approach

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IFAC Proceedings Volumes 1999年第2期32卷 3189-3194页

作者： Yufen He Da-Wei Gu Guangxiong Wang Ian Postlethwaite Zhang Xiong Group 601 Department of Computer Science and Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China PR. Department of Control Engineering Harbin Institute of Technology Harbin 150001 China PR Control Systems Research Department of Engineering University of Leicester LE1 7RH UK

An important aspect of linear controller design is to clarify whether the design reaches the performance limit. Based on an industrial project-a high precision three-axis gyro test table (servo system), a paradigm is presented to demonstrate that the performance limit of the disturbance attenuation design of the servo system can be reached in a systematic way by using the μ -synthesis. Moreover, this paper reveals that the performance limit is determined by the bandwidth. This finding will help the designer to judge whether any given performance specification is achievable.

关键词： Performance limits Servo systems Disturbance attenuation μ -Synthesis Bandwidth

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Empirical studies of evolving systems

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Empirical Software engineering 1999年第4期4卷 370-380页

作者： Bennett, K. Burd, E. Kemerer, C. Lehman, M.M. Lee, M. Madachy, R. Mair, C. Sjoberg, D. Slaughter, S. Department of Computer Science University of Durham United Kingdom Katz Graduate School of Business University of Pittsburgh United States Department of Computing Imperial College United Kingdom Department of Informatics and Simulation RMCS Cranfield University United Kingdom Litton Guidance and Control Systems USC Center for Software Engineering United States Design Engineering and Computing University of Bournemouth United Kingdom Department of Informatics University of Oslo Norway Graduate School of Industrial Administrations Carnegie Melon University United States

This paper describes the results of the working group investigating the issues of empirical studies for evolving systems. The groups found that there were many issues that were central to successful evolution and this concluded that this is a very important area within software engineering. Finally nine main areas were selected for consideration. For each of these areas the central issues were identified as well as success factors. In some cases success stories were also described and the critical factors accounting for the success analyzed. In some cases it was later found that a number of areas were so tightly coupled that it was important to discuss them together.

关键词： Software engineering

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