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Annual Conference of Industrial Electronics Society

作者： Z. Chen K. Jiang J.C. Hung Automatic Control Department Beijing Institute of Aeronautics and Astronautics Beijing China Electrical and Computer Engineering Department University of Tennessee Knoxville TN USA

A local observability matrix for a linear time-varying system is introduced. The matrix is useful for observability analysis; it is much easier to use than the usual observability grammian for linear time-varying systems. The matrix is applied to a terrain-aided inertial navigation system to reveal the observability of the system in terms of the nature of the terrain. Results of a simulated covariance analysis are presented and discussed.< >

关键词： Observability Inertial navigation Sensor systems Extraterrestrial measurements Aircraft navigation computer errors Time varying systems Sea measurements Accelerometers Application software

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Extreme Point Results for Robust Stabilization of Interval Plants with First Order Compensators

Extreme Point Results for Robust Stabilization of Interval P...

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American control Conference (ACC)

作者： C. V. Hollot F. J. Kraus R. Tempo B. R. Barmish Department of Electrical and Computer Engineering University of Massachusetts Amherst MA USA Institute of Automatic Control and Industrial Electronics Swiss Federal Institute of Technology Zurich Switzerland Politecnico di Torino CENS-CNR Torino Italy Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI USA

It has recently been shown that a first order compensator robustly stabilizes an interval plant family if and only if it stabilizes all of the extreme plants. That is, if the plant is described by m-th order numerator and monic n-th order denominator with coefficients lying in prescribed intervals, it is necessary and sufficient to stabilize the set of 2 m+n+l extreme plants. These extreme plants are obtained by considering all possible combinations for the extreme values of the numerator and denominator coefficients. In this paper, we prove a stronger result. Namely, it is necessary and sufficient to stabilize only sixteen of the extreme plants. These sixteen plants are generated using the Kharitonov polynomials associated with the numerator and denominator. Furthermore, when additional apriori information about the compensator is specified (sign of the gain and signs and relative magnitudes of the pole and zero), then in some cases, it is necessary and sufficient to stabilize eight critical plants while in other cases, it is necessary and sufficient to stabilize twelve critical plants.

关键词： Robustness Polynomials Robust control Poles and zeros Robust stability Feedback control control system synthesis automatic control Industrial electronics computer graphics

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A neuron-based pulse servo for motion control

A neuron-based pulse servo for motion control

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IEEE International Conference on Robotics and Automation (ICRA)

作者： S. De Weerth L. Nielsen C. Mead K. Astrom Dept. of Comput. Sci. California Inst. of Technol. Pasadena CA USA Department of Automatic Control Lund Institute of Technology Lund Sweden Department of Computer Science California Institute of Technology Pasadena CA USA

A design frame and a set of circuit elements with which generic motor controllers can be implemented are described. A simple proportional-derivative motor controller was embedded in the design frame. Its performance advantages over a more traditional controller are described. Also discussed are the merits of biologically inspired systems used in applications related to robotics.< >

关键词： Servomechanisms Motion control Robots Biology computing control systems Biological systems Size control Motion planning Integrated circuit technology automatic control

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An expert system shell for analysis of real time signals

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Annual Review in automatic Programming 1989年第PART 2期15卷 65-67页

作者： Tong, Wei-Guang Zhao, Lin-Liang Department of Automatic Control Shenyang Architectural and Civil Engineering Institute Shenyang 110015 China Department of Computer Science Northeast University of Technology Shenyang 110006 China

The interpreting and analysis of real time sampled signals is important for improvement of quality of products. This article developed an expert system shell ASESS for interpreting and analyzing the real time signals based on the analysis-synthesis (A-S) inference technology which frequently used by human expert in considering complex problems. The A-S technology is introduced. In order to meet the need of speed of real time control, in ASESS two measures are taken: 1. 1. Knowledge classification and meta-rules are applied. 2. 2. The system is developed with the combination of three languages: Assembler, Fortran and Prolog. Considering the vagueness in inference of human experts, the fuzzy inference technology are applied. The knowledge base of ASESS can be separated from inference engine and can be edited easily, so the system ASESS can be used effectively in different cases by adding appropriate knowledge in that field. © 1990.

关键词： analysis-synthesis Expert systems meta-rules real time diagnosis

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An Expert System Shell for Analysis of Real Time Signals

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IFAC Proceedings Volumes 1989年第13期22卷 65-67页

作者： Tong Wei-Guang Zhao Lin-Liang Department of Automatic Control Shenyang Architectural and Civil Engineering Institute Shenyang 110015 PRC Department of Computer Science Northeast University of Technology Shenyang 110006 PRC

The interpreting and analysis of real time sampled signals is important for improvement of quality of products. This article developed an expert system shell ASESS for interpreting and analyzing the real time signals based on the analysis-synthesis (A-S) inference technology which frequently used by human expert in considering complex problems. The A-S technology is introduced. In order to meet the need of speed of real time control, in ASESS two measures are taken: 1. Knowledge classification and meta-rules are applied. 2. The system is developed with the combination of three languages: Assembler, Fortran and Prolog. Considering the vagueness in inference of human experts, the fuzzy inference technology are applied. The knowledge base of ASESS can be separated from inference engine and can be edited easily, so the system ASESS can be used effectively in different cases by adding appropriate knowledge in that field.

关键词： Expert systems analysis-synthesis meta-rules real time diagnosis

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A high accuracy magnetic heading system composed of fluxgate magnetometers and a microcomputer

A high accuracy magnetic heading system composed of fluxgate...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Sheng-We Liu Zhao-Nin Zhang J.C. Hung Automatic Control Department Northwestern Polytechnical University Xi'an China Electrical and Computer Engineering Department University of Tennessee Knoxville TN USA

The authors present a magnetic heading system consisting of two fluxgate magnetometers and a single-chip microcomputer. The system, when compared to gyro compasses, is smaller in size, lighter in weight, simpler in construction, quicker in reaction time, free from drift, and more reliable. Using a microcomputer in the system, heading error due to compass deviation, sensor offsets. scale factor uncertainty, and sensor tilts can be compensated with the help of an error model. The laboratory test of a typical system showed that the accuracy of the system was improved from more than 8 degrees error without error compensation to less than 0.3 degrees error with compensation.< >

关键词： Magnetometers Microcomputers Magnetic field measurement Magnetic sensors Sensor systems Instruments Vehicles Error analysis Sensor phenomena and characterization automatic control

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A Hierarchical Analysis Model for Multiobjective Decisionmaking

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IFAC Proceedings Volumes 1989年第12期22卷 13-18页

作者： Zhong-Jun Zhang Jian-Bo Yang Dong-Ling Xu Department of Automatic Control Shanghai Jiao Tong University 1954 Hua Shan Road Shanghai 200030 PRC Department of Electrical Engineering and Computer Science China Textile University Shanghai PRC

In this paper we attempt to propose a method for preference degree analysis in multiobjective decisionmaking problems(MDMPs), called the multiple factor analysis method based on a hierarchical analysis model. The concept of preference degree(PD) is first discussed. Here a PD is used as a measurement for describing preference information of decision makers (DMs) to some value of an objective. A hierarchical model for analyzing the preference information is then deduced by defining objective domain of discourse (ODD), fuzzy degree domain of discourse (FDDD), factor domain of discourse (FDD) and sensitivity vector. Furthermore, some methods are explored for analyzing DMs* PDs of objective values according to a single factor and multiple factors, respectively. At last, an example is briefly introduced.

关键词： Decision theory hierarchical decision making fuzzy set theory multiobjective optimization identification expert systems

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On the necessary and sufficient conditions for the very strict Hurwitz property of a 2-D characteristic polynomial

On the necessary and sufficient conditions for the very stri...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： P. Agathoklis E.I. Jury M. Mansour Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada Department of Electrical Engineering University of Miami Coral Gables FL USA Institute of Automatic Control and Industrial Electronics Swiss Federal Institute of Technology Zurich Switzerland

Necessary and sufficient conditions for the bivariate characteristic polynomial of a matrix to be a very strict Hurwitz polynomial (VSHP) are presented. These conditions are based on solving the Lyapunov equation for 2-D continuous systems using the Kronecker product and lead a simple test for the VSHP property. It requires testing only the eigenvalues of three stable matrices, which is simpler than the existing polynomial tests.< >

关键词： Sufficient conditions Polynomials Equations Continuous time systems Stability analysis Eigenvalues and eigenfunctions System testing Frequency domain analysis Frequency dependence automatic control

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ON THE ROBUSTNESS OF LOW-ORDER SCHUR POLYNOMIALS

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS 1988年第5期35卷 570-577页

作者： KRAUS, FJ ANDERSON, BDO JURY, EI MANSOUR, M Institute of Automatic Control ETH Zurich Zurich Switzerland Department of Systems Engineering Australian National University Canberra ACT Australia Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA

Robust Schur stability conditions are obtained for polynomials of orders two to five. For n=2 and 3, the conditions obtained are related to stability of the corner points, while for n=4 and 5, the conditions are related to stability of corner and possible supplementary points. The number of points increases substantially as the polynomial order increases. The obtained results are of importance in the robust design of control systems. The difficulty in extending the approach to higher-order polynomials is discussed. Special cases for such extensions are mentioned. Further applications of the results obtained may be of use in the stability study of two-dimensional systems. Some examples for the application of the stability conditions are given and, in particular, the two counterexamples presented in the literature are discussed.

关键词： low-order Multidimensional systems control systems higher-order Polynomial Steady state stability study corners Point of inflexion Robustness

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Analysis and modeling of digitized straight-line segments

Analysis and modeling of digitized straight-line segments

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International Conference on Pattern Recognition

作者： Shu-Xiang Li M.H. Loew Department of Automatic Control Changsha Institute of Technology China Department of Electrical Engineering and Computer Science George Washington University USA

ISBN: (纸本)0818608781

A general formula for the slope and mathematical models of digitized straight-line segments are derived and discussed in detail. The models are parametric and the parameters are calculated uniquely and in closed form from the slope without the need for recursion or interaction. The modeling is information-preserving and explicitly uses the slope. The models are in a form convenient for plotting, detecting, and recognizing digitized straight-line segments.< >

关键词： Image segmentation Lattices Digital images Mathematical model Image processing Pattern recognition Graphics Equations Parametric statistics

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