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IEEE Conference on control Technology and Applications (CCTA)

作者： D. Hughes J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candidate is the Preisach independent domain hysteresis model that is characterized by the congruent minor loop and wiping out properties. Comparable minor loop and decaying oscillation test data for a multi-sheet piezoceramic actuator (made of lead zirconate titanate) attached to a flexible beam are presented and are seen to be very consistent with the two Preisach model properties. The commanded parameter is the sheet transverse electric field while the measured parameter is an approximately colocated strain induced in the beam. Equivalent data for a Nitinol SMA wire muscle, attached to the same beam, are also presented. The input and output parameters are the SMA current and a beam strain respectfully. The minor loop and wiping out evidence is less strong than that of the piezoceramic case, but encouraging. In all experiments the quasi-steady state responses were generated in order to avoid exciting beam flexible modes which would complicate the analysis.

关键词： Piezoelectric materials Shape memory alloys Hysteresis Strain measurement Shape control Open loop systems Testing Actuators Titanium compounds Electric variables measurement

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On the design and implementation of a dependable space instrument

On the design and implementation of a dependable space instr...

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1995 Euromicro Workshop on Parallel and Distributed Processing

作者： Woolliscroft, L.J.C. Yearby, K.H. Alleyne, C.H.St. Thompson, J.A. Dunford, Cm. Department of Automatic Control and Systems Engineering University of Sheffield PO Box 600 SheffieldS1 4DU United Kingdom Department of Physics University of Sheffield PO Box 600 SheffieldS1 4DU United Kingdom Department of Computer Science University of Sheffield PO Box 600 SheffieldS1 4DU United Kingdom

ISBN: (纸本)0818670312

The Digital Wave Processor, DWP [1-10], is an example of a dependable distributed system which has been built and will be flown on the ESA/NASA Cluster satellites. Pre-flight testing of the DWP instruments is nearly complete and the results of this programme of testing are described. Much of the fault-tolerant behaviour of DWP has been tested and found to function as expected. Of the problems which have been found the majority are attributed to the initial definition of hardware and software interfaces. Various small hardware limitations and problems have been experienced. These have generally been overcome without there being any impact on the fault-tolerant design, but they have consumed a considerable amount of engineering effort. © 1995 IEEE.

关键词： Fault tolerance

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Improved LMS estimation via structural detection

Improved LMS estimation via structural detection

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IEEE International Symposium on Information Theory

作者： J. Homer I. Mareels R. Bitmead B. Wahlberg F. Gustafsson Electrical & Computer Engineering Department University of Queensland Brisbane QLD Australia Systems Engineering Department RSISE-Australian National University Canberra ACT Australia S3-Automatic Control Royal Institute of Technology Stockholm Sweden Automatic Control Linköping University Linkoping Sweden

In various adaptive estimation applications, the unknown channel is characterized by an impulse response which consists of extended regions of negligible response or 'inactivity'. We consider the LMS estimation of a channel that may be well approximated by an FIR (filter) model with only a few nonzero tap coefficients within a given delay horizon or tap length n. When the number of nonzero tap coefficients m is small compared to the delay horizon n, the performance of the LMS estimator is greatly enhanced when this specific structure is exploited. We propose a consistent algorithm that performs identification of nonzero taps only.

关键词： Least squares approximation Australia Cost function Finite impulse response filter Automatic control Delay estimation Adaptive estimation Circuits Land mobile radio Sampling methods

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control of Large Scale 2D Linear systems

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IFAC Proceedings Volumes 1995年第10期28卷 937-940页

作者： D.H. Owens E. Rogers Centre for Systems and Control Engineering University of Exeter Exeter EX4 4QF UK Department of Electronics and Computer Science University of Southampton Southampton S017 1BJ UK

This paper solves a large scale design problem for a sub-class of 2D linear systems termed differential linear repetitive processes. The method is to decompose the problem into a single lower order one which can be solved by direct application of well known standard linear control theory. It is shown that arbitrarily good closed-loop performance can be achieved under suitable choice of a single design parameter.

关键词： 2D systems modelling stability control systems design

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Automatic generation of a neural network architecture using evolutionary computation

Automatic generation of a neural network architecture using ...

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Electronic Technology Directions to the Year 2000

作者： E. Vonk L.C. Jain L.P.J. Veelenturf R. Johnson Control Systems and Computer Engineering Group BSC Laboratory for Network Theory Department of Electrical Engineering University of Twente Enschede Netherlands Knowledge-based Engineering System Group School of Electronic Engineering University of South Australia Adelaide Australia Weapons Systems Division Defence Science and Technology Organisation Salisbury SA Australia

This paper reports the application of evolutionary computation in the automatic generation of a neural network architecture. It is a usual practice to use trial and error to find a suitable neural network architecture. This is not only time consuming but may not generate an optimal solution for a given problem. The use of evolutionary computation is a step towards automation in architecture generation. In this paper a brief introduction to the field is given as well as an implementation of automatic neural network generation using genetic programming.< >

关键词： Neural networks computer architecture Evolutionary computation Genetic programming Network topology Genetic algorithms Biological cells systems engineering and theory Knowledge engineering Australia

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Modeling and control of a spark ignition engine with variable cam timing

Modeling and control of a spark ignition engine with variabl...

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American control Conference (ACC)

作者： A.G. Stefanopoulou J.A. Cook J.S. Freudenberg J.W. Grizzle M. Haghgooie P.S. Szpak Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Scientific Research Laboratory Ford Motor Company Limited Dearborn MI USA

A control scheme is designed to minimize emissions and respond to rapid throttle changes in a fuel injected, spark ignition engine equipped with variable cam timing. The model is derived from engine mapping data for an eight cylinder experimental engine mounted in a dynamometer test cell; it is fundamentally a nonlinear and multivariable model. The control scheme jointly manages fuel and cam position.

关键词： Sparks Ignition computer aided manufacturing CADCAM Timing Engine cylinders Fuels Valves Torque Exhaust systems

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Consequences of modular controller development for automotive powertrains: a case study

Consequences of modular controller development for automotiv...

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IEEE Conference on Decision and control

作者： A.G. Stefanopoulou K.R. Butts J.A. Cook J.S. Freudenberg J.W. Grizzle Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Scientific Research Laboratory Ford Motor Company Limited Dearborn MI USA

A modular controller structure for automotive powertrains has certain benefits. These include improved productivity through module reuse, seamless integration of new features, transparent removal of obsolete features, and module sharing across powertrain platforms. Modular architecture also potentially reduces the complexity in the design and calibration process, in that controller modules for different subsystems are developed independently. Due to the fact that the automotive powertrain system contains many highly interactive sub-systems, it is not clear that a modular controller development process can yield acceptable feedback controller performance with respect to emissions, fuel economy, and drivability. In this paper, we describe the engineering design issues associated with a decentralized development process, and the impact that the resulting decentralized controller has upon the dynamic response of the feedback system. We describe the possible detrimental consequences of subsystem interaction, and the potential of coordinated, multivariable feedback for alleviating these limitations. control of a spark ignition engine incorporating variable camshaft timing is used as a case study.

关键词： Automotive engineering Mechanical power transmission Process control control systems Feedback Productivity Process design Calibration Adaptive control Fuel economy

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Estimating 3-D body parameters from reflection component separating imagery: a performance analysis

Estimating 3-D body parameters from reflection component sep...

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International Symposium on computer Vision (ISCV)

作者： J.C. Glas F. van der Heijden Department of Electrical Engineering Control Systems and Computer Engineering Group.Laboratory for Measurement Science and Instrumentation University of Twente Enschede Netherlands Lab. for Meas. Sci. & Instrum. Twente Univ. Enschede Netherlands

Iterative least-squares estimation requires accurate reflectance models to retrieve geometrical parameters of 3-D objects from an image projection. We investigate the use of separating the diffuse (body) reflection from the specular (surface) reflection, where the latter is responsible for image highlights. The performance of several models has been analysed by comparing local higher-order derivatives of the least-squares error function. Experiments show that the (smooth) diffuse component yields the best convergence properties, while the (sharp) specular component cast be utilized to improve noise insensitivity.

关键词： Parameter estimation Performance analysis Convergence Reflectivity Noise measurement Optical reflection Image retrieval Additive noise Velocity measurement computer errors

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Blind linear recursive equalizer with decorrelation algorithm

Blind linear recursive equalizer with decorrelation algorith...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： T.S. Castelein Y. Bar-Ness R. Prasad Northern Telecom Inc. Netherlands New Jersey Institute of Technology Department of Electrical & Computer Engineering University Heights Newark NJ USA Telecommunications and Traffic Control Systems Group Delft University of Technnology Delft Netherlands

High-speed communications suffer from intersymbol interference (ISI) introduced by the channel. In order to combat ISI one commonly uses equalizers that need a training sequence to adjust the equalizer tap weights. When sending a training sequence is not appropriate, blind equalization has to be used. A new blind linear equalizer is proposed. The equalizer has a recursive structure. To avoid stability problems, a soft limiter is used in the feedback loop. The weights are controlled by means of the decorrelation algorithm. For channels without precursors, the equalizer converges to the desired weights in around 500 iterations, depending on the amount of distortion. The novel blind equalization technique is globally convergent for minimum and non-minimum phase channels.

关键词： Decorrelation Blind equalizers Decision feedback equalizers Finite impulse response filter Communication system control Stability Weight control Convergence Communication system traffic control Telecommunication computing

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H/sub /spl infin// vibration control of active suspension for automotive application

H/sub /spl infin// vibration control of active suspension fo...

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SICE Annual Conference

作者： A. Kanbolat Y. Okuyama F. Takemori L. Gianone S. Horvat J. Bokor Department of Information and Knowledge Engineering Facult of Engineering Tottori University Japan Tottori Daigaku Tottori JP Dept. of Inf. & Knowledge Eng. Tottori Univ. Japan Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Hungary Department of Transpoi-talion Engineering Technical University of Budapest Hungary

This paper deals with simultaneous control of acceleration transmission, wheel load fluctuation, suspension deflection and sprung mass displacement. The control theory is based on the robust H/sub /spl infin// control theory with the consideration of the modeling errors lumped into an unstructured uncertainty acting on the unperturbed plant. The design method is new and powerful for electronic car suspension's control systems, as it presents a new approach to the designers for the computation of a controller maintaining robust stability while guaranteeing the performance in a wide frequency range, even in the case of the controller is applied to the actual plant. Additionally, the paper emphasizes that the assumptions in the modeling step may lead to unrealistic control designs and, as an example, the effect of the rigidity assumption on the behavior of the open loop system is discussed.

关键词： control systems control theory Open loop systems Displacement control Weight control Acceleration Wheels Fluctuations Robust control Power system modeling

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