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Nonlinear time-delay systems: A polynomial approach using ore algebras

作者： Halás, Miroslav Institute of Control and Industrial Informatics Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovicova 3 Bratislava 812 19 Slovakia

ISBN: (纸本)9783642028960

In this work Ore algebra defined over the field of meromorphic functions is introduced to provide a polynomial approach to nonlinear time-delay systems. In comparison to the systems without delays the polynomials related to the nonlinear time-delay systems belong now to the multivariate skew polynomial ring and have the sense of differential time-delay operators. Then the condition for accessibility of nonlinear time-delay systems is presented in terms of common left factors of such polynomials. Transfer functions of nonlinear time-delay systems are introduced as well and their basic properties are shown. © 2009 Springer-Verlag Berlin Heidelberg.

关键词： Time delay

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Anti-synchronization chaos shift keying method: Error derivative detection improvement

Anti-synchronization chaos shift keying method: Error deriva...

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作者： Čelikovský, Sergej Lynnyk, Volodymyr Institute of Information Theory and Automation Academy of Sciences of the Czech Republic P.O. Box 18 182 08 Prague 8 Czech Republic Department of Control Engineering Faculty of Electrical Engineering Czech Technical University Prague Czech Republic

ISBN: (纸本)9783902661654

This paper studies a new modification of the anti-synchronization chaos shift keying scheme for the secure encryption and decryption of data. A new concept of the detection of the correct/incorect binary value in the receiver is used. The method proposed here requires very reasonable amount of data to encrypt and time to decrypt a single bit. Basically, to encrypt a single bit, only one iteration is needed. Moreover, the security of this method is systematically investigated showing its good resistance to typical decryption attacks. Theoretical results are supported by the numerical simulations.

关键词： Synchronization

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Tremor analysis by decomposition of acceleration into gravity and inertial acceleration using inertial measurement unit

Tremor analysis by decomposition of acceleration into gravit...

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9th International Conference on information Technology and Applications in Biomedicine, ITAB 2009

作者： Šprdlík, Otakar Hurák, Zdeněk Hoskovcová, Martina Růžička, Evžen Institute of Information Theory and Automation ASCR Czech Republic Czech Technical University in Prague Faculty of Electrical Engineering Dept. of Control Eng. Czech Republic Charles University in Prague 1st Faculty of Medicine Dept. of Neurology Czech Republic

ISBN: (纸本)9781424453795

Decomposition of acceleration was investigated as an alternative to commonly used direct spectral analysis of measured acceleration or angular velocity for tremor quantification. Orientation estimation algorithm was devised to decompose the measured acceleration into inertial acceleration caused by sensor movement in inertial reference frame and gravitational artifact. Resulting signals, beside measured acceleration and angular velocity, were used to assess tremor amplitude and frequency by spectral peak detection. The algorithm was tested on experimental data from a clinical study including patients with essential tremor. Influence of sensor calibration and connections of results to analytic approach are analyzed briefly. ©2009 IEEE.

关键词： Acceleration

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Robust decentralized PID controller design: A case study

Robust decentralized PID controller design: A case study

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Eurocon

作者： Danica Rosinova Alena Kozakova Faculty of Electrical Engineering and Information Technology Institute of Control and Industrial Informatics Slovak University of Technology Bratislava Slovakia

Robust stability is an important aspect in control of real world systems, since uncertainties have to be considered in dynamic system models. The basic required quality of the system is its stability in the whole uncertainty domain called robust stability. This paper studies the robust decentralized controller design for a quadruple tank process, [3,4]. For this case study, several important aspects of system analysis are shown (pairing, stabilizability via decentralized control). The main contribution is the decentralized PID controller design in both frequency and time domains, analysis and comparison of results. The obtained results are supported by simulations used to demonstrate and compare the different approaches.

关键词： Robust control Three-term control Robust stability Distributed control Uncertainty Frequency domain analysis Transfer functions Uncertain systems State-space methods Structural engineering

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Robust PID controller design using BMI

Robust PID controller design using BMI

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Eurocon

作者： Danica Rosinova Vojtech Vesely Institute of Control and Industrial Informatics Faculty of Electrical Engineering and Information Technology Slovak University of Technology Slovak Republic

The new BMI based method for robust stabilizing PID controller design for linear uncertain system is proposed. The general constrained structure of controller matrix is considered which is appropriate both for output feedback and decentralized control. The developed control design scheme aims at robust stabilization with guaranteed cost. The extended quadratic performance index is used including the first derivative of the state vector to damp oscillations. The obtained results use parameter-dependent Lyapunov function to reduce conservatism of robust stability conditions.

关键词： Robust control Three-term control control systems Uncertain systems Output feedback Distributed control control design Costs Performance analysis Vectors

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Insufficiencies of the practical BIBO stability concept with regard to signal processing systems

Insufficiencies of the practical BIBO stability concept with...

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International Workshop on Multidimensional (nD) Systems

作者： S. Schauland J. Velten A. Kummert K. Galkowski Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland

In this paper the practical BIBO stability concept introduced by Agathoklis and Bruton is analyzed with respect to its applicability in the field of signal processing applications. In the field of n-D signal processing signals are often bounded to all but one dimension like be the time-direction of a spatio-temporal signal, for instance. This property makes the use of systems which meet the conditions of practical BIBO stability, mainly known from the field of control theory, appear to be feasible. However, it can be shown hat practical stability in its original form is not sufficient in signal processing if not further conditions are supposed. This is done by comparing the 2D Fourier transform of the actually measured impulse response of exemplary systems to the frequency response expected on basis of the transfer function. Additionally, an application example is given to verify the presented observations.

关键词： Signal processing Transfer functions Multidimensional signal processing Stability analysis Frequency response Fourier transforms control theory Frequency measurement Multidimensional systems Testing

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Load forecasting scheme based on energy efficiency for planning the expansion of electrical systems

Load forecasting scheme based on energy efficiency for plann...

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2009 IEEE Bucharest PowerTech: Innovative Ideas Toward the electrical Grid of the Future

作者： Cerda Arias, J.L. Westermann, D. Department of Power System Faculty of Electrical Engineering and Information Technology Technology University of Ilmenau Gustav-Kirchhoff-St. 01 D-98693 Ilmenau Germany Technology University of Ilmenau Ilmenau Germany Institute of Electric Power and Control Technologies Ilmenau University of Technology Germany

ISBN: (纸本)9781424422357

A fundamental phase in the electrical systems planning is the temporal and spatial load forecasting. By changes in the structures of electricity markets and implementing policies for energy optimization, it is necessary to consider new variables that detail of better form the behaviorś forecasting and expansion of the electrical consumption to medium and long time. This work proposes a global load forecasting scheme to long-time, covering the topic temporal and spatial. The load forecasting proposes based in the influence of macroeconomic variables, implementing energy efficiency policies and the entry of new technologies that optimize their consumption. The proposed strategy combines load forecasting methods based on traditional methodologies with the implementation of the wavelets transformed and is validated through a sensitivity analysis for a real data set. Also, the model is applied to a real distribution system showing the potential for their use. © 2009 IEEE.

关键词： Energy efficiency

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Review of prognostic problem in condition-based maintenance 10

Review of prognostic problem in condition-based maintenance

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2009 10th European control Conference, ECC 2009

作者： Dragomir, Otilia Elena Gouriveau, Rafael Dragomir, Florin Minca, Eugenia Zerhouni, Noureddine Valahia University of Târgoviste Electrical Engineering Faculty Automation and Information Department Unirii Avenue 18-20 Târgoviste Romania FEMTO-ST Institute CNRS - UFC Automatic Control and Micro-Mechatronic Systems Department 24 rue Alain Savary Besançon25000 France

ISBN: (纸本)9783952417393

Prognostic is nowadays recognized as a key feature in maintenance strategies as it should allow avoiding inopportune maintenance spending. Real prognostic systems are however scarce in industry. That can be explained from different aspects, on of them being the difficulty of choosing an efficient technology: many approaches to support the prognostic process exist, whose applicability is highly dependent on industrial constraints. Thus, the general purpose of the paper is to explore the way of performing failure prognostics so that manager can act consequently. Different aspects of prognostic are discussed. The prognostic process is (re)defined and an overview of prognostic metrics is given. Following that, the 'prognostic approaches' are described. The whole aims at giving an overview of the prognostic area, both from the academic and industrial points of views. © 2009 EUCA.

关键词： Condition based maintenance

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Probabilistic structure from sound

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Advanced robotics 2009年第12-13期23卷 1687-1702页

作者： Wang, Chieh-Chih Lin, Chi-Hao Hu, Jwu-Sheng Department of Computer Science and Information Engineering Graduate Institute of Networking and Multimedia National Taiwan University Taipei 10617 Taiwan Intelligent Robotics Program of Industrial Technology Research Institute Department of Electrical and Control Engineering National Chiao Tung University HsinChu 310 Taiwan

Auditory perception is one of the most important functions for robotics applications. Microphone arrays are widely used for auditory perception in which the spatial structure of microphones is usually known. In practice, microphone array calibration can be tedious and other devices or means are required. The structure from sound (SFS) approach addresses the problem of simultaneously localizing a set of microphones and a set of acoustic events that provides a great flexibility to calibrate different setups of microphone arrays. However, the existing method does not take measurement uncertainty into account and does not provide uncertainty estimates of the SFS results. In this paper, we propose a probabilistic structure from sound (PSFS) approach using the unscented transform in which the uncertainties of the PSFS results are also available. In addition, a probabilistic sound source localization approach using the PSFS results is provided to improve sound source localization accuracy. The ample results of simulation and experiments using low-cost, off-the-shelf microphones demonstrate the feasibility and performance of the proposed PSFS approach. © 2009 VSP.

关键词： Microphone array

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LMI based design for the Acrobot walking 9th

LMI based design for the Acrobot walking

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9th IFAC Symposium on Robot control, SYROCO 2009

作者： Anderle, Milan Čelikovský, Sergej Henrion, Didier Zikmund, Jirǎí Czech Technical University in Prague Faculty of Electrical Engineering Department of Control Engineering Technická 2 Prague166 27 Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod vodárenskou věží 4 Prague182 08 Czech Republic LAAS-CNRS University of Toulouse 7 avenue du colonel Roche Toulouse31077 France

ISBN: (纸本)9781617825583

This paper aims to further improve previously developed design for Acrobot walking based on partial exact feedback linearization of order 3. Namely, such an exact system transformation leads to an almost linear system where error dynamics along trajectory to be tracked is a 4-dimensional linear time-varying system having 3 time-varying entries only, the remaining entries being either zero or one. In such a way, exponentially stable tracking can be obtained by quadratically stabilizing a linear system with polytopic uncertainty. The current improvement is based on applying LMI methods to solve this problem numerically. This careful analysis significantly improves previously known approaches. Numerical simulations of Acrobot walking based on the above mentioned LMI design are demonstrated as well.

关键词： Linear matrix inequalities

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