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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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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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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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The B-spline interpolation in visualization

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Journal of Computing and Information Technology 1999年第3期7卷 245-253页

作者： Mihajlović, Željka Goluban, Alan Department of Electronics Microelectronics Computer and intelligent Systems Faculty of Electrical Engineering arid Computing University of Zagreb Unska 3 Zagreb10 000 Croatia Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Unska 3 Zagreb10 000 Croatia

The volume data is generally in the form of the large array of numbers. In order to render the object hidden in the volumetric data, we need to reconstruct or interpolate data values between the samples. The novelty presented in this paper is B-spline interpolation in the volumetric space. We show that this approach is better than currently used methods. We also present a hybrid approach, analyze this approach in frequency domain and compare it to B-spline interpolation. To enhance the quality during the volume visualization process it is important to enhance the quality of the reconstruction. It is of crucial importance to explore different undesired effects. If better reconstruction is performed the more accurate result of volume visualization process is achieved.

关键词： Volume rendering

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Symbolic verification of executable control specifications

Symbolic verification of executable control specifications

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IEEE International Symposium on computer Aided control System Design (CACSD)

作者： C. Banphawatthanarak B.H. Krogh K. Butts Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Powertrain Control Systems Department Ford Research Laboratory Dearborn MI USA

Stateflow/sup TM/ is a MATLAB/Simulink toolbox that supports the development of executable specifications for discrete-state functions. It also supports general flowcharting of program functions. This paper describes a MATLAB program, sf2smv 2.0, that generates input for a symbolic model checking program, SMV, to verify properties of Stateflow/sup TM/ diagrams in Simulink. The SMV modules are constructed to reflect precisely the execution semantics in the simulation of Stateflow/sup TM/ diagrams. This extends previous work that created verification files that reflected an idealized version of the Stateflow/sup TM/ semantics. This paper describes how the principal Stateflow/sup TM/ execution rules are translated into SMV modules. Examples are used to illustrate the transformation procedures and their application to verify properties of executable specifications for control features in automotive powertrain control applications.

关键词： Mathematical model Power system modeling computer languages Mechanical power transmission Vehicle dynamics Trademarks control systems Automotive engineering MATLAB control system synthesis

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A variable voltage converter topology for permanent-magnet brushless DC motor drives using buck-boost front-end power stage

A variable voltage converter topology for permanent-magnet b...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： B.-S. Lee R. Krishnan Motion Control Systems Research Group Department of Elec. & Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

A variant of a low cost, four-quadrant converter topology for permanent magnet brushless DC (PMBDC) motor drives is proposed in this paper. It has the advantage of variable DC input voltage to the machine through a buck-boost front-end power stage and hence low torque ripple at very low speeds, a desirable feature in high performance applications. It has a fixed commutation voltage, which is equal to the DC source voltage. Further, it is proved that the proposed power converter topology will enable the maximum extraction of power from PMBDC motor drives. In addition, the energization and commutation of machine phases can be achieved independently. Because of these features, the proposed topology provides high operational reliability for the motor drives.

关键词： Voltage Brushless DC motors Motor drives Switches Circuit topology Switching converters Costs Circuit faults Reluctance motors Commutation

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Design of a linear switched reluctance machine

Design of a linear switched reluctance machine

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

作者： Byeong-Seok Lee Han-Kyung Bae P. Vijayraghavan R. Krishnan Bradley Department of Electrical and Computer Engineering Motion Control Systems Research Group Virginia Polytechnic Institute and State University Blacksburg VA USA

A standard design procedure for a single sided and longitudinal flux based linear switched reluctance machine is developed in this paper. The proposed design procedure utilises the rotating switched reluctance machine design by converting the specifications of the linear machine in to the equivalent rotary machine. The machine design is carried out in the rotary domain which is then transformed back in to the linear domain. Such a procedure brings to bear the knowledge base and familiarity of the rotary machine designers to design a linear machine effectively. The paper contains the illustration of the proposed design procedure for a 4.8 m long prototype. An analysis procedure is developed with a magnetic model and results from it are verified with finite element analysis prior to construction of the prototype. Extensive experimental correlation in the form of inductance vs. position vs. current and propulsion force vs. position vs. current to validate the analysis and design procedure is given in the paper.

关键词： Reluctance machines Finite element methods Prototypes Magnetic analysis Inductance Propulsion Torque Equations Motion control Standards development

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Lyapunov stability theory for linear repetitive processes - The 1D equation approach

Lyapunov stability theory for linear repetitive processes - ...

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1999 European control Conference, ECC 1999

作者： Rogers, E. Gramacki, J. Gramacki, A. Galkowski, K. Owens, D.H. Department of Electronics and Computer Science University of Southampton SouthamptonSO17 1BJ United Kingdom Department of Robotics and Software Engineering Technical University of Zielona Gora ul. Podgorna 50 Zielona Gora65-246 Poland Department of Automatic Control and Systems Engineering University of Sheffield Mappin Street SheffieldS1 3JD United Kingdom

ISBN: (纸本)9783952417355

This paper reports further development of the so-called ID Lyapunov equation based approach to the stability analysis of differential linear repetitive processes. In particular, it is shown that this approach leads to stability tests which can be implemented by computations with matrices which have constant entries, and that if the example under consideration is stable then physically meaningful information concerning one key aspect of 'transient' performance is available for no extra cost. The computational efficiency of these new stability tests against alternatives is also discussed and some areas for short to medium term further research briefly noted. © 1999 EUCA.

关键词： Linear systems

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Signal separation of background EEG and spike by using morphological filter

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IFAC Proceedings Volumes 1999年第2期32卷 4301-4306页

作者： Shigeto Nishida Masatoshi Nakamura Akio Ikeda Hiroshi Shibasaki Department of Computer and Communication Engineering Fukuoka Institute of Technology Fukuoka 811-0295 Japan Department of Advanced Systems Control Engineering Saga University Saga 840-8502 Japan Department of Brain Pathophysiology Kyoto University Faculty of Medicine Kyoto 606-8507 Japan

A signal separation method for extracting background electroencephalogram (EEG) from EEG containing spikes was proposed. Morphological filters were designed for extracting spike waveforms, and then the background EEG was obtained by subtracting the detected spike waveforms from the EEG with spike . The proposed method was evaluated by using simulated EEG data, which consisted of a summation of EEG without spike and model waveform of typical spike. The background EEG separated by the method was processed by the automatic background EEG interpretation.

关键词： Signal separation Background EEG Spike Morphological filter Automatic EEG interpretation

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