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IEEE International Conference on Image Processing

作者： G.-O. Glentis C.H. Slump O.E. Herrmann Department of Electrical Engineering Control Systems and Computer Engineering Group (BSC) Laboratory for Network Theory and VLSI-Design University of Twente Enschede Netherlands

In this paper a novel algorithm is presented for the efficient two-dimensional (2-D) symmetric noncausal finite impulse response (FIR) filtering and autoregressive (AR) modeling. Symmetric filter masks of general boundaries are allowed. The proposed algorithm offers the greatest maneuverability in the 2-D index space in a computational efficient way. This flexibility can be taken into advantage if the shape of the 2-D mask is not a priori known and has to be dynamically configured.< >

关键词： Finite impulse response filter Nonlinear filters Autocorrelation Equations Vectors Virtual manufacturing Filtering algorithms control system synthesis control engineering computing computer networks

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A feedback limitation of decentralized controllers for TITO systems, with application to a reactive ion etcher

A feedback limitation of decentralized controllers for TITO ...

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IEEE Conference on Decision and control

作者： J.S. Freudenberg J.W. Grizzle B.A. Rashap Electronics Manufacturing and Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

This paper explores an inherent feedback limitation of using decentralized LTI control on a two-input, two-output LTI plant. The result is motivated by, and illustrated on, a reactive ion etcher.

This paper explores an inherent feedback limitation of using decentralized LTI control on a two-input, two-output LTI plant. The result is motivated by, and illustrated on, a reactive ion etcher.< >

关键词： Feedback control systems Etching Centralized control Actuators Chemical processes Plasma applications computer aided manufacturing Semiconductor device noise Power system modeling

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Interpolation and numerical differentiation for observer design

Interpolation and numerical differentiation for observer des...

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American control Conference (ACC)

作者： S. Diop J.W. Grizzle P.E. Moraal A. Stefanopoulou The Control Systems Laboratory of the Dept. Elect. Eng. and Comp. Sci. U. of Michigan Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan AnnArbor MI

This paper explores interpolation and numerical differentiation as a basis for constructing a new approach to the design of nonlinear observers.

关键词： Interpolation control systems Observers Sampling methods Laboratories Equations Observability State estimation Sampled data systems Numerical analysis

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Stochastic interpretation of H/sub /spl infin// and robust estimation

Stochastic interpretation of H/sub /spl infin// and robust e...

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IEEE Conference on Decision and control

作者： R.S. Mangoubi B.D. Appleby G.C. Verghese Control and Decision Systems Division C. S. Draper Laboratory and Aeronautics and Astronautics Control and Decision Systems Division C. S. Draper Laboratory Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology USA

H/sub /spl infin// and robust estimation methods are discussed from a deterministic as well as a stochastic point of view. The relationship between H/sub /spl infin// and risk sensitivity for systems with known plant dynamics is reviewed. This relationship is extended to the more general case of estimators that are robust to noise and plant model uncertainties. Specifically, it is shown that a stochastic equivalent to the robust H/sub /spl infin// estimator exists. An example is used to compare the estimators in the deterministic sense, using the frequency response of the transfer function between the inputs and the error, as well as in the stochastic sense, using the probability density function of the output error residual.< >

关键词： Stochastic processes Robustness Estimation error Aerodynamics State estimation Extraterrestrial measurements Noise measurement Minimax techniques Riccati equations Stochastic systems

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Positive real controller design with H/sub /spl infin// norm performance bound

Positive real controller design with H/sub /spl infin// norm...

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American control Conference (ACC)

作者： Xin Chen J.T. Wen Control Laboratory for Mechanical Structures OLa MS Depart.ment of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

This paper considers the positive real controller design for strictly positive real plants subject to a general H/sub /spl infin// norm performance bound. This problem is shown to be equivalent to a pair of small gain problems. A sufficient condition for their solutions is a standard H/sub /spl infin// small gain problem which can be readily solved. This procedure has been applied to the control of an experimental rotating flexible beam with good results.

关键词： control systems Performance gain Actuators Negative feedback Output feedback Feedback loop Robust control Hydrogen Robustness Adaptive control

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Utilization of torque wheels for active damping of flexible manipulators

Utilization of torque wheels for active damping of flexible ...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： F. Khorrami A.A. Gomez M.D. Hills Polytechnic University School of Electrical Engineering 4 Computer Science Control/Robotics Research Laboratory Brooklyn NY USA Bernoulli Optical Systems Company Danbury CT USA Control/Robotics Research Laboratory (CRRL) School of Electrical Engineering 4 Computer Science University of California Brooklyn NY USA

Utilization of inertial actuators, such as torque wheels, for vibration damping of a single-link flexible manipulator is considered. The torque wheel is mounted at the end effector of the manipulator to provide a bending moment at the tip for vibration suppression and pointing purposes. The torque exerted by the torque wheel at the end-effector of the manipulator is achieved through controlling the velocity of the torque wheel. A decentralized control scheme is advocated in this paper for slewing and vibration suppression. The local loop around the torque wheel is closed through feedback of the accelerometer signal at the tip. Experimental results are provided to show the effectiveness of the proposed method for end-effector positioning of flexible-link manipulators. Although the experimental results reported are for a single-link flexible manipulator, the results are applicable to the multi-link case. It may be shown that the dynamics from the voltage input to the torque wheel mounted at the tip to the tip position is minimum phase and hence invertible given that an inner-loop controller has been applied to stabilize the rigid-body motion.< >

关键词： Wheels Damping Torque control Manipulator dynamics Actuators End effectors Velocity control Distributed control Vibration control Feedback loop

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A graph-theoretic approach to integrated process and control system synthesis

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IFAC Proceedings Volumes 1994年第7期27卷 61-66页

作者： K.M. Hangos F. Friedler J.B. Varga L.T. Fan Systems and Control Research Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest Pf. 63 Hungary Department of Systems Engineering Research Institute of Chemical Engineering Hungarian Academy of Sciences H-8201 Veszprim Pf 125 Hungary Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA

A graph-theoretic method for integration of process and control system (IPCS) syntheses has been proposed in the present paper. The foundation of this integration is a well-established, graph-theoretic approach to process synthesis in conjunction with the analysis of structural controllability based on digraph-type process models. A directed bipartite graph, the CP-graph, has been introduced for unambiguous representation of an IPCS structure. The notion of CP-graph has given rise to a set of axioms for describing the combinatorially feasible and controllable structures. The maximal controllable structure of an IPCS synthesis problem has been defined as the union of combinatorially feasible and controllable IPCS structures; obviously, the optimal IPCS structure must be a substructure of this maximal controllable structure. Thus, the mathematical programming model, e.g., MINLP model, of an IPCS synthesis problem should be derived from the maximal controllable structure. The fundamental combinatorial algorithm of IPCS synthesis, i.e., algorithm CMSG, for identifying this maximal controllable structure has been formulated. The complexity of this algorithm has been proved to be polynomial on the size of the problem; its efficacy is illustrated with a relatively simple example. The resultant IPCS structures are compared with the structures synthesized without considering their control systems.

关键词： Process control control system synthesis structural controllability combinatorial mathematics synthesis methods

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H/sub /spl infin// control and estimation problems with delayed measurements: state space solutions

H/sub /spl infin// control and estimation problems with dela...

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American control Conference (ACC)

作者： K.M. Nagpal R. Ravi Electrical & Computer Engineering Department University of Iowa Iowa IA USA GE Cor rate Research & Development Control Systems and Electronic Technologies Laboratory Schenectady NY USA

Necessary and sufficient conditions for existence of estimators and controllers meeting desired H/sub /spl infin// performance criterion are given for the case where the finite sensor delays exist. A complete characterization of such controllers is also presented. The necessary and sufficient conditions are computable and are framed in terms of two algebraic Riccati equations and one finite-horizon Riccati differential equation. The controllers and estimators that are obtained here have a linear periodic structure and are easily implementable. At the foundation of these results lies a modified Nehari problem, the state space solution for which may be of independent interest.

关键词： Delay estimation State estimation State-space methods Riccati equations Sufficient conditions Differential equations control systems Sensor phenomena and characterization Differential algebraic equations Periodic structures

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EXPONENTIAL AND INPUT OUTPUT STABILITY ARE EQUIVALENT FOR LINEAR TIME-VARYING systems

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SADHANA-ACADEMY PROCEEDINGS IN engineering SCIENCES 1993年第1期18卷 31-37页

作者： RAVI, R KHARGONEKAR, PP Control Systems Laboratory General Electric Research and Development Center Schenectady USA Electrical Engineering and Computer Science The University of Michigan Ann Arbor USA

We present a new proof showing that for finite dimensional linear time-varying (FDLTV) systems stabilizable by output feedback, exponential and input-output stability are equivalent. This proof does not involve the notion of a dual system as has been done elsewhere and makes use instead of the existence of coprime factorizations. This result is analogous to that in the linear time-invariant case, but because of the time-varying nature of the matrices involved, is not as obvious.

关键词： EXPONENTIAL STABILITY INPUT OUTPUT STABILITY COPRIME FACTORIZATION TIME-VARYING systems

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Comparative study of self-organizing neural networks

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International Workshop on Artificial Neural Networks, IWANN 1993

作者： Wann, Chin-Der Thomopoulos, Stelios C. A. Decision and Control Systems Laboratory Department of Electrical and Computer Engineering The Pennsylvania State University University ParkPA16802 United States

ISBN: (纸本)9783540567981

A benchmark study of self-organizing neural network models is conducted. The comparison of advantages and disadvantages of unsupervised learning artificial neural networks are discussed. The unsupervised learning artificial neural networks discussed in this paper include adaptive resonance theory (ART2), DIGNET, self-organizing feature map, and learning vector quantization (LVQ). For the benchmark study of artificial neural network applications on data clustering and pattern recognition problems with additive gaussian noise, we compare the performance of the unsupervised learning systems, ART2 and DIGNET. Results of computer simulation show that both AR.T2 and DIGNET achieve good performance on pattern clustering, but DIGNET is faster in the learning process and has better results on the overall clustering performance. © Springer-Verlag Berlin Heidelberg 1993.

关键词： Unsupervised learning

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