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Portland International Conference on Management of engineering and technology (PICMET)

作者： J. Andersson T. Cegrell Kam-Hoong Cheong M. Haglind Department of Industrial Information and Control Systems KTH Royal Institute of Technology Stockholm Sweden Department of Electrical & Electronic Engineering College of Engineering University of Tenaga National Kajang Selangor Darul Ehsan Malaysia

This paper proposes a novel, alternative approach for strategic information systems/information technology (IS/IT) planning in small and medium-sized enterprises, which is less comprehensive and more flexible than most present strategic information systems planning methodologies, thus attempting to bridge the gap between theory and practice. The approach is implementation-centric and based on a framework in which an architectural lifecycle model for Enterprise Information systems Architecture (EISA) is used as the common conceptual model. Furthermore, the proposed planning process is iterative and the rationale for this is the need to support the gradually increasing awareness, as well as to tackle the ever-changing technical and business requirements that an enterprise information system ultimately must comply with. Although it starts with the business vision, the developed enterprise information system architectural alternatives are made possible, even suggested, by emerging technologies, such as the impact of the Internet.

关键词： Information management technology management Information technology Information systems Management information systems Strategic planning technology planning Bridges Process planning Internet

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Estimation of errors in inertial navigation systems with GPS measurements

Estimation of errors in inertial navigation systems with GPS...

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IEEE International Symposium on Industrial electronics (ISIE)

作者： Sinpyo Hong F. Harashima Sung-Ha Kwon Soon Bong Choi Man Hyung Lee H. Lee School of Mechanical Engineering Pusan National University busan South Korea Department of Electronic Systems Engineering Tokyo Metropolitan Institute of Technology Tokyo Japan Department of Control and Instrumentation Engineering Changwon NatE28099l University South Korea

ISBN: (纸本)0780370902

In this paper, observability properties of a multiantenna GPS measurement system for the estimation of errors in INS are presented. It is shown that time-invariant INS error models are observable with measurements from at least three GPS antennas on the vehicle. There is at least one unobservable mode with two antennas. There are three unobservable modes with one antenna. It is also shown that time-varying INS error models are instantaneously observable with measurements from three GPS antennas. A numerical simulation results are given to verify the effectiveness of the multiantenna measurement system on the INS error estimation. In the simulation, a GPS measurement system is considered in which a trade-off between computational load and accuracy of estimation is achieved.

关键词： Estimation error Inertial navigation Global Positioning System Antenna measurements Observability Vehicles Time measurement Stability Mechanical variables measurement Matrix decomposition

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Pole assignment for stochastic systems with unknown coefficients

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Science China(Technological Sciences) 2000年第3期43卷 313-323页

作者：陈翰馥曹希仁 Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and System Science Chinese Academy of Sciences Beijing 100080 China Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Hong Kong

This paper solves the exact pole assignment problem for the single-input stochastic systems with unknown coefficients under the controllability assumption which is necessary and sufficient for the arbitrary pole assignment for systems with known coefficients. The system noise is required to be mutually independent with zero mean and bounded second moment. Two approaches to solving the problem are proposed: One is the iterative learning approach which can be applied when the state at a fixed time can be repeatedly observed with different feedback gains; the other is the adaptive control approach which works when the trajectories satisfy a nondegeneracy condition. Both methods are essentially based on stochastic approximation, and the feedback gains are recursively given without invoking the certainty-equivalency-principle.

关键词： stochastic system leading control pole assignment adaptive control.

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A novel efficient algorithm for music transposition

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Organised Sound 2000年第3期4卷 161-167页

作者： Fagan, A.D. Lawlor, Bob School of Control Systems and Electrical Engineering Dublin Institute of Technology Kevin St Dublin 8 United States Department of Electronic and Electrical Engineering University College Dublin Belfield Dublin 4 Ireland

We present a novel efficient algorithm for scaling the frequency content of an audio signal by any desired factor in the range 0.5 (minus one octave) to 2.0 (plus one octave) enabling a recording to be played in any desired key without affecting the tempo. The algorithm uses an adaptive overlap-add (AOLA) technique to realise the desired frequency scaling without affecting the duration. Informal listening tests show output quality equal to that of a conventional overlap-add algorithm used in many commercially available systems, but offering significant computational saving relative to that algorithm. The algorithm can also be used to simultaneously change both the tempo and key of a recording. © 2000, Cambridge University Press. All rights reserved.

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Dynamic wavelet neural network for nonlinear dynamic system identification

Dynamic wavelet neural network for nonlinear dynamic system ...

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IEEE Conference on control technology and Applications (CCTA)

作者： Yonghong Tan Xuanju Dang Feng Liang Chun-Yi Su Laboratory of Intelligent Systems and Control Engineering Guilin Institute of Electronic Technology Guilin China Mechanical Engineering Department Concordia University Montreal Canada

A dynamic neural network with a hidden layer that consists of wavelets for nonlinear dynamic system identification is presented. In order to model the dynamics of nonlinear dynamic systems, the external auto-regressive connection is introduced into the wavelet based neural network. For fast training of the wavelet neural network, a PID backpropagation algorithm is proposed. The procedure of using a wavelet neural network for modeling is described in detail in the article. Finally, an example for identification of a continuous-stirred-tank-reactor is given.

关键词： Nonlinear dynamical systems Neural networks System identification Signal processing algorithms Continuous-stirred tank reactor Wavelet transforms Lattices Intelligent systems Intelligent control Intelligent networks

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Quasi-ARMAX Modeling Approaches to Identification and Prediction of Nonlinear systems

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IFAC Proceedings Volumes 2000年第15期33卷 1055-1060页

作者： Jinglu Hu Kousuke Kumamaru Kotaro Hirasawa Department of Electrical and Electronic Systems Engineering Kyushu University Higashiku Fukuoka 812-8581 Japan. Tel: (+81}92-642-3956 Fax: (+81}92-642-3962 Department of Control Engineering and Science Kyushu Institute of Technology Iizuka 820 Japan. Tel: (+81}948-29-7713 Fax: (+81}948-29-7709

This paper presents a modeling scheme to obtain user-friendly models for nonlinear systems. The idea is to use flexible nonlinear structures such as sigmoidal neural networks, neurofuzzy networks as model kernels and to develop user-friendly interfaces based on application specific knowledge and the nature of network structure. As an example, it is developed so called quasi-ARMAX models for general nonlinear systems; Taylor expansion technique is used to construct linear ARMAX model like interfaces that contain some complicated coefficients; then these coefficients are represented using a multi-input-multi-output (MIMO) neurofuzzy model. It is shown that the quasi-ARMAX models have both good approximation ability and some userfriendly properties.

关键词： Nonlinear systems identification ARMAX modeling neurofuzzy model prediction adaptive control

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H_∞ almost disturbance decoupling for mimo bilinear systems

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Asian Journal of control 2000年第4期2卷 251-262页

作者： Zheng, Yufan Ho, Daniel W. C. Lu, Guoping Institute of Systems Science East China Normal University Shanghai 200062 China Department of Electrical and Electronic Engineering The University of Melbourne Parkville VIC 3052 Australia Department of Mathematics City University of Hong Kong Hong Kong Department of Automatic Control Nantong Institute of Technology Jiangsu 226007 China

The H∞ almost disturbance decoupling problem is considered. In this paper, a nonlinear design is proposed to find a state feedback controller for bilinear systems. The closed-loop system is internally stable and achi... 详细信息

The H_∞ almost disturbance decoupling problem is considered. In this paper, a nonlinear design is proposed to find a state feedback controller for bilinear systems. The closed-loop system is internally stable and achieves disturbance attenuation in nonlinear H_∞ sense. We defined a special form of Lyapunov function, which is constructed in terms of one or a set of positive definite constant matrices. If, except of the origin of system, the corresponding polynomial of the positive definite matrix (or several polynomials relevant to the positive definite constant matrices) has (have) no zero on a given subset of state space, then we can construct a controller to solve our problem. It is found that the controller structure could be complicated, but is feasible in computation and may require optimization technique to search the solution. We consider both SIMO and MIMO cases with illustrated examples.

关键词： Bilinear systems H∞ almost disturbance decoupling Hamiltonjacobi inequality State feedback control

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Eigenstructure assignment in descriptor systems via output feedback: a new complete parametric approach

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INTERNATIONAL JOURNAL OF control 1999年第4期72卷 345-364页

作者： Duan, GR Control Systems Theory Department of Control Engineering Harbin Institute of Technology Harbin China Department of Electronic and Electrical Engineering University of Sheffield Sheffield S1 3JD Mappin Street United Kingdom

A complete parametric approach is proposed for eigenstructure assignment in descriptor linear systems via output feedback, which assigns arbitrary rank(E) finite relative eigenvalues to the closed-loop system and guarantees the closed-loop regularity. General parametric expressions for the normalized left and right closed-loop eigenvector matrices are obtained on the basis of a recent parametric solution for the generalized Sylvester matrix equation. These expressions contain two groups of parameter vectors which represent the degree of freedom existing in the solution of the closed-loop eigenvectors. A pair of general complete expressions for the output feedback gain is also presented, containing the part of parameter vectors existing in the closed-loop eigenvectors and another extra two parameter matrices. The sub-conventional case is especially treated, in which there exists a one-to-one mapping relation between the closed-loop eigenvector matrices and the output feedback gain. This approach does not impost any restriction on the closed-loop eigenvalues, but generalizes and improves some of the existing results. An illustrative example shows the effect of the proposed approach.

关键词： FEEDBACK control systems LINEAR systems

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Robustness comparison of control schemes with disturbance observer and with acceleration control loop

Robustness comparison of control schemes with disturbance ob...

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IEEE International Symposium on Industrial electronics (ISIE)

作者： I. Godler M. Inoue T. Ninomiya T. Yamashita Department of Electrical and Electronic Systems Engineering Kyushu University Fukuoka Japan Department of Control Engineering Kyushu Institute of Technology Kitakyushu Japan

In this paper, we analyze performances of a servo control system with acceleration control loop inside of a speed control loop. We evaluate robustness of such a system in comparison to robustness of a robust control system by using a disturbance observer. The results suggest that robustness against the system's parameters variations is superior in the case of servo control with an acceleration control loop included. Additionally, disturbance suppression is much higher (-50 dB attenuation compared to -20 dB) even at low gain of the acceleration control loop and with the low bandwidth acceleration sensor used. The system's response and its robustness against the disturbances are studied in dependence of the acceleration control loop's gain and of the bandwidth of an acceleration sensor. Simulation examples are shown.

关键词： Robust control Acceleration Servosystems control systems Velocity control Bandwidth Torque control Servomotors Low pass filters systems engineering and theory

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A multiple model approach to fault-tolerant control using Takagi-Sugeno fuzzy modelling: Real application to an induction motor drive system

A multiple model approach to fault-tolerant control using Ta...

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1999 European control Conference, ECC 1999

作者： Lopez-Toribio, C.J. Patton, R.J. Daley, S. Control and Intelligent Systems Engineering Department of Electronic Engineering University of Hull Cottingham Road HullHU6 7RX United Kingdom ALSTOM Energy Technology Centre Cambridge Road Whetsone LeicesterLE8 6LH United Kingdom

ISBN: (纸本)9783952417355

This paper investigates the development of a Supervisory control System with qualitative tasks at the upper level and simple quantitative models at the lower level to control complex non-linear systems. A new quantitative approach for the stability of non-linear fuzzy inference systems using Takagi-Sugeno (T-S) fuzzy models is presented. The necessary conditions for the assignability of eigenvalues to a region in the s-plane and the necessary conditions to guarantee the stability of fuzzy models for both T-S fuzzy observers and T-S fuzzy controllers together are derived. The problem is solved via the Linear Matrix Inequality (LMI) method. The paper demonstrates the feasibility of this system architecture through application to a fault-tolerant design for a railway traction system using DSP in a hardware test-rig. © 1999 EUCA.

关键词： Linear matrix inequalities

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