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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： K. Cisowski M. Niedzwiecki Department of Automatic Control Faculty of Electronics Telecommunications and Computer Science Technical University Gdansk Poland Politechnika Gdanska Gdansk WojewÃ³dztwo pomorskie PL

The paper presents a new approach to reconstruction of audio signals. First, a general reconstruction formula is derived allowing one to estimate unknown samples from the known (neighboring) ones. Then it is shown that the unknown excitation appearing in the analytical reconstruction formula can be replaced with the natural excitation waveform extracted from the available portions of the signal.

关键词： Speech enhancement Acoustic noise Fading Implants White noise Speech synthesis computer science Signal analysis Signal processing Digital signal processing

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Adaptive decentralized vibration control of a cable-stayed bridge in the presence of seismic excitation

Adaptive decentralized vibration control of a cable-stayed b...

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ASME 1999 Design Engineering Technical Conferences, DETC 1999

作者： Luo, Ningsu Rodellar, Jose Sen, Manuel De La Veh, Josep Campus Montilivi P-ll Dept of Electronics Automatic Control and Computer Engineering University of Girona Girona17071 Spain Department of Applied Mathematics III School of Civil Engineering Technical University of Catalonia Barcelona08034 Spain Department of Electricity and Electronics Faculty of Science University of Basque Country Bizkaia Leioa48940 Spain

ISBN: (纸本)9780791819760

In this paper, an adaptive decentralized controller is presented to attenuate the transversal vibration of a flexible cablestayed bridge induced by seismic excitation, in which only local sensor information has been used to generate the control signal that is sent to the actuator. The dynamic behavior of the beam structure is characterized by a nonlinear mathematical model with interconnection terms, which was obtained by using technique of finite element. The controller design is made based on the principle of sliding mode such that a priori knowledge on the exact value of system parameters, structural disturbances and the seismiic excitation is not required. In particular, it is assumed that the upper and lower bounds for the seismic excitation are also unknown. The closed-loop robust stability has been achieved through the generation of a sliding motion in the system. Nu-merical simulation is done to illustrate the effectiveness of the proposed control scheme for a scaled model of the bridge subject to the Taft earthquake. © 1999 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： controllers

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Fundamental principle and synthesis of variable structure control for nonlinear neutral control systems with time-delays *

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IFAC Proceedings Volumes 1999年第2期32卷 2227-2232页

作者： Cun-Chen Gao Zhen-Guang Yung Xin-Zheug Zhang Yong-Qing Liu Department of Mathematics and Computer Science Yantai Teachers University Yantai 264025 P.R.China Department of Automatic Control Engineering South China University of Technology Guangzhou 510641 P.R.China

This paper investigates the practicality problem of the equivalent control method for nonlinear neutral type variable structure control system (VSCS) with time-delays. Existence of the sliding mode for the system is given, and the conditions under which the sliding process has nothing to do with the external disturbance and parameter perturbation are obtained. At last, the synthetical method of the VSCS is provided and illustrated by an example of chemical process.

关键词： nonlinear neutral variable structure control delays sliding-mode control.

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Qualitative analysis of impulsive hopfield neural network

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IFAC Proceedings Volumes 1999年第2期32卷 5996-6001页

作者： Zhi-Hong Guan De-Bao Sun Bin-Hai Yu Guanrong Chen Department of Automatic Control Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P.R.China Fax:+86-27-87543130 Department of Electrical and Computer Engineering University of Houston TX 77204-4793 USA

Many evolutionary processes, particularly some biological systems, exhibit impulsive dynamical behaviors, and they can be well described by impulsive Hopfield neural networks. This paper formulates and studies a model of impulsive Hopfield neural networks. Several fundamental issues such as global exponential stability, existence, and uniqueness of equilibria of such neural networks are established.

关键词： impulses neural networks equilibrum stability qualitative analysis

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Output end-point weighted generalized predictive control-a polynomial approach

Output end-point weighted generalized predictive control-a p...

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American control Conference (ACC)

作者： W. Ebert M. Morari IFA Swiss Federal Institute of Technology Switzerland Institute of Computer Science Humboldt University of Berlin Berlin Germany Automatic Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland

A new generalized predictive control (GPC) algorithm is presented, which makes use of the concept of output end-point weightings. The aim of the algorithm is a reduced computational burden with respect to the state end-point weighted GPC and a relaxation of the infinite output weighting of constrained receding horizon predictive control. The new output end-point weighted GPC algorithm is developed using the polynomial approach. After a proof of nominal stability the relation of Kalman filtering and predictive control is derived. A final simulation of a benchmark example emphasizes the reduced computational burden and the enhanced stochastic tracking capability.

关键词： Predictive control Polynomials Equations Stability Prediction algorithms computer science automatic control Laboratories Kalman filters Filtering

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Robust CGPC design via simple Youla parameterisation

Robust CGPC design via simple Youla parameterisation

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European control Conference (ECC)

作者： Z. Kowalczuk P. Suchomski Department of Automatic Control Faculty of Electronics Telecommunication and Computer Science Technical University of Gdańsk Narutowicza 11/12 P.O. Box 612 80-952 Gdańsk Poland

The main objective of this contribution is a new development of the continuous-time generalised predictive control (CGPC) resulting in a Youla-based CGPC design procedure for both minimumphase and nonminimum-phase uncertain SISO systems. The derived design procedure consists of two steps. In the first step nominal stability and nominal performance of the control system are established by using a fully analytical design methodology, based on a collection of closed-loop prototype characteristics with definite time-domain specifications. In the second step, the primary structure of the CGPC controller is suitably enriched by `Youla' blocks guaranteeing that the resulting CGPC control system has the required robustness properties, i.e. robust stability and robust performance.

关键词： Robustness Polynomials control systems Sensitivity Uncertainty Noise Observers

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Practical H/sub /spl infin// weighting functions and their application to real-time control of a pilot plant

Practical H/sub /spl infin// weighting functions and their a...

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American control Conference (ACC)

作者： J. Hu C. Bohn H.R. Wu Department of Electrical & Electronic Engineering University of Melbourne Parkville VIC Australia Automatic Control Laboratory of Electrical Engineering Ruhr University of Bochum Bochum Germany School of Computer Science and Software Engineering Clayton Australia

In this paper, the selection of H/sub /spl infin// weighting functions for general practical applications is investigated. Uncertainty weighting functions for typical low-order plants with parametric uncertainties are derived. It is shown that H/sub /spl infin// weighting function for a general SISO plant can be obtained by the combination of these elementary low-order plants. Weighting functions of reflecting other system specifications in H/sub /spl infin// design are also investigated. Explicit weighting function expressions are given to address position and rate limits of an actuator, tracking error performance, overshoot, etc. Finally, the proposed methods are demonstrated by the roll-angle control design of a laboratory-scale model of a vertical take-off aircraft via simulation and real-time control.

关键词： Uncertainty Frequency Upper bound automatic control Laboratories Damping computer science Application software Actuators control design

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MATLAB based tools for 2D linear systems with application to iterative learning control schemes

MATLAB based tools for 2D linear systems with application to...

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

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

Repetitive processes are a distinct class of 2D systems of both theoretic and practical interest. For example, they arise in the study of industrial processes such as long-wall coal cutting operations and also in the modeling of classes of iterative learning control schemes. This paper describes the development of MATLAB based tools for control related analysis/controller design in the case of so-called discrete linear repetitive processes with particular emphasis on the iterative learning control application. Some areas for short to medium term further development are also briefly noted.

关键词： MATLAB Linear systems control systems Iterative algorithms Electrical equipment industry Industrial control Mathematical model Machining Metals industry Informatics

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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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Interactive on-line evaluation of robot motion control

Interactive on-line evaluation of robot motion control

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IEEE Conference on control Technology and Applications (CCTA)

作者： A. Valera A. Robertsson K. Nilsson R. Johansson Department of System Engineering & Automation Valencia Technical University Valencia Spain Department of Automatic Control Lund Institute of Technology Lund University Lund Sweden Lund Institute of Technology Department of Computer Science Lund University Lund Sweden

This paper presents a new real-time architecture for motion control of industrial robots. The new control system obtained has two main advantages: first it provides a total open control architecture and the second advantage is the simplicity and the interactivity of the platform developed. Experimental evaluation of a passivity-based control scheme shows the benefits of the architecture which is unique in the sense that open and advanced control can be combined with built-in safety logic as required in industrial applications.

关键词： Robot motion Motion control Robot control Industrial control control systems Electrical equipment industry Service robots Robot sensing systems Safety Logic

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