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Guidance, Navigation, and control Conference, 1995

作者： Naidu, D. Subbaram Calise, Anthony J. Measurement and Control Engineering Research Center Idaho State University PocatelloID83209-8060 United States School of Aerospace Engineering Georgia Institute of Technology AtlantaGA30332-0150 United States

The theory of singular perturbations and time scales has played an important role in aircraft performance analysis and in the development of feedback guidance laws for aerospace vehicles. This paper presents a survey of the applications of the theory of singular perturbations and time scales in guidance, navigation, and control of air and space transportation systems. In particular, emphasis will be placed on problem formulation and solution approaches that are useful in applying the theory for various types of problems arising in aerospace systems. Further, the survey embraces the related fields such as fluid dynamics, space structures and space robotics. © 1995 by the American institute of Aeronautior and Astronautics, Inc. All rights reserved.

关键词： Surveys

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A study on the design and characteristics of the high frequency resonant inverter for ultrasonic motor drive using fuzzy controller

A study on the design and characteristics of the high freque...

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International Conference on Industrial Electronics, control and Instrumentation

作者： In-Su Cha Hae-Am Park Gwon-Jong Yu Young-Dong Kim Hyung Lae Baek Department of Electric & Electronic Engineering Dong Shin University Choongnam South Korea Department of Computer & Information Processing Kwangju Institute of Science and Technology Kwangju South Korea Department of Photovoltaic System Korea Institute of Energy and Research Daejeon South Korea Department of Control & Measurement Engineering Chosun University Sesekdong South Korea Department of Electrical Engineering Chosun University Sesekdong South Korea

ISBN: (纸本)0780330269

In the present paper, a fuzzy logic based ultrasonic motor (USM) is used in order to properly control the speed and phase difference for the elasticity and viscosity of a robot joint. The traveling wave USM is driven by two-phase sine wave signals, and the phase difference of the signals is usually selected to +90/spl deg/ and -90/spl deg/ meaning high speed and maximum torque of the USM. In this paper, we describe USM rotational speed characteristics at no load. The first phase difference is adjusted in the range from +90/spl deg/ to -90/spl deg/ by fuzzy controller as is the reached target speed.

关键词： Resonant frequency Resonant inverters

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ON A METHOD OF CRYPTANALYSIS FOR CRYPTOSYSTEM WITH INVOLUTION

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART III-FUNDAMENTAL ELECTRONIC SCIENCE 1995年第5期78卷 1-11页

作者： TSUNOO, Y OKAMOTO, E UEMATSU, T Member NEC Software Hokuriku Ltd. Ishikawa Japan 920-21 School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan 923-12 Members Tomohiko Uyematsu graduated in Electrical Engineering from Tokyo Institute of Technology in 1982 and received a Master's degree from the same university in 1984 after whichhe became an assistant in the Electrical and Electronics Engineering Department there. In1990 he became a Lecturer and in 1991 an Assistant Professor. In 1992 he became Assistant Professor at the School of Information Science Japan Advanced Institute of Science and Technology. He holds a doctorate in engineering. Among his research interests are signal theory optical communications theory coding theory and data compression algorithms. In 1988 he received a Shinohara Commemorative Science Encouragement Prize and in 1992 a Best Paper Award. He is the author of the bookIntroduction to Record Data Compression Algorithms. He is a member of the Measurement Control Society and the Society for Information Theory and Its Applications.

Cryptology provides the technological basis for guaranteed network security. In the field of business, to guarantee the security of information, everyone needs easy-to-use cryptology. Starting with the announcement by the U.S. National Bureau of Standards of the DES cryptosystem and the proposal by NTT of the FEAL cryptosystem, secret-key cryptographic algorithms have been published, involution-type block cryptosystems which use secret key to encipher 64 bits of plain text as 64 bits of cipher text [2, 3, 9, 10, 12]. NTT has proposed the one-way function MAP, which is also an involution-type transform. In this paper, we study a new cryptanalytic method for involution-type cryptosystems and show by example that it can be applied practically in a ciphertext-only attack on the one-way function MAP. For an involution-type cryptosystem, by increasing the amount of construction in the data-randomization phase and by increasing the size of the secret key, we can guarantee the computational security by preventing the estimation of the secret key. However, if we study the properties of the function used in the design of the data-randomization phase, by specifying input/output values of the function which are independent of the secret key, it may be possible to use the inverse function [11] to calculate the secret key. This method is called the intermediate cipher method. The intermediate cipher method differs from previous methods in the small quantity of data required for breaking.

关键词： INVOLUTION BLOCK CIPHER INTERMEDIATE CIPHER CIPHERTEXT-ONLY ATTACKS

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Facilitating control of fed-batch fermentation processes by monitoring the growth rates of Saccharomyces cerevisiae

Facilitating control of fed-batch fermentation processes by ...

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IEEE Conference on control technology and Applications (CCTA)

作者： Keulers Ariaans Soeterboek Giuseppin Bioengineering Laboratory National Institute of Bioscience and Human Technology (NIBH) Tsukuba Ibaraki Japan Department of Electrical Engineering Measurement and Control Group Eindhovan University of Technology Eindhoven Netherlands Unilever Research Laboratory Vlaardingen Netherlands

In this paper we present a growth rate controller for a fed-batch bioprocess. An observer estimates the growth rate. The observer is based on knowledge about the stoichiometric relations of the process. Furthermore, the observer needs online measurements of the oxygen uptake rate and the carbon-dioxide production rate. The control structure is a simple one, and the fed-batch fermentation process is inherently nonlinear. A growth rate dependent precompensation is introduced to linearise the process. The remaining control actions can then be tackled using a normal PI-controller. Simulation studies show good performance for oxidative growth on glucose. Deterioration of the control is expected if the growth rate becomes bigger than the critical growth rate. Furthermore, some non-modelled dynamical effects occur during set-point changes. To some extend these effects can be modelled and the model can be incorporated in the controller. The overall performance of the controller increases. Yet this improvement is at the cost of a more complex structure. A trade off has to be found between control performance and controller complexity.< >

关键词： Process control Chemical industry Biological control systems Proportional control Monitoring Nonlinear systems Observers

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ORDER REDUCTION OF RIGOROUS DYNAMIC-MODELS FOR DISTILLATION-COLUMNS

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COMPUTERS & CHEMICAL engineering 1993年第SUPPL期17卷 S311-S316页

作者： MUSCH, HE STEINER, M Department of Energy and Process Engineering Measurement and Control Laboratory Swiss Federal Institute of Technology (ETH) Zürich CH—8092 Zürich

A method for order reduction of rigorous dynamic models of distillation columns is presented. The approach is a modification and extension of the compartmental models presented in 1986 by Benallou et al! Formulating the algebraic equations and the differential equations for total holdup for the compartments, but keeping the differential equations for concentration dynamics for each tray, Murphree tray efficiencies can be used and response accuracy increased. The resulting models of substantially lower order show good dynamic and steady-state conformity with the complete rigorous model. The example of an industrial binary distillation column *** the effectiveness of this approach.

关键词： DISTILLATION COLUMNS ORDER REDUCTION COMPARTMENTAL MODELS DYNAMIC SIMULATION DIFFERENTIAL-ALGEBRAIC EQUATIONS

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PHASE-SHIFTER - A NONLINEAR CIRCUIT FOR DIRECT measurement OF PHASE MARGIN IN FEEDBACK-control SYSTEMS 35

PHASE-SHIFTER - A NONLINEAR CIRCUIT FOR DIRECT MEASUREMENT O...

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35TH MIDWEST SYMP ON CIRCUITS AND SYSTEMS

作者： DANTOWITZ, P SHAFAI, B SHAFAI, E Department of Electrical and Computer Engineering Northeastern University Boston 02115 MA United States Department of Mechanical Engineering Measurement and Control Laboratory Swiss Federal Institute of Technology (ETH) Zurich 8092 Switzerland

ISBN: (纸本)0780305108

A novel nonlinear circuit called "Phase Shifter" is introduced which accurately measures the phase margin of a linear system operating in a feedback control loop. The measurement is made by inserting the phase shifter in the control loop, causing it to undergo self-sustained oscillations (limit cycle) of relatively low amplitude. It is shown that sustained oscillations occur at the gain crossover frequency and the phase margin is equal to the phase lag of the inserted circuit. A complete analysis of computing amplitude and frequency of oscillation which employs the classical sinusoidal-input describing function is also given and the stability of limit cycle and its neighborhood using the theory of integral manifolds are included. © 1992 IEEE.

关键词： Linear systems

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A special least squares method for curve fitting

A special least squares method for curve fitting

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International Conference on Industrial Electronics, control and Instrumentation

作者： H. Chen Department of Electrical Engineering Harbin Institute of Technology China Measurement and Control Group Department Electrical Engineering Eindhovan University of Technology Eindhoven Netherlands

A special least squares (SLS) method is proposed which is based on minimizing the sum of squared relative deviations. The author analyzes the problem of classical least squares (LS) in fitting a static characteristic equation and points out the shortcomings of the LS method under some experimental conditions. It is noted that the proposed SLS method could overcome the shortcomings. The formulas of SLS are given and its mathematical characteristics are analyzed. Under the given conditions, this method is unbiased, consistent, and efficient. An example is given of fitting a static characteristic equation of a potentiometer by using the SLS method. The results show that, under the given experimental conditions, the SLS method is superior to the traditional LS method.< >

关键词： Least squares methods Curve fitting Potentiometers Laser sintering Voltage Equations Area measurement Instruments Electric potential measurement standards

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Phase shifter: a nonlinear circuit for direct measurement of phase margin in feedback control systems

Phase shifter: a nonlinear circuit for direct measurement of...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： P. Dantowitz B. Shafai E. Shafai Department of Electrical and Computer Engineering Northeastern University Boston MA USA Department of Mechanical Engineering Measurement and Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland

A nonlinear circuit called phase shifter is introduced. It accurately measures the phase margin of a linear system operating in a feedback control loop. The measurement is made by inserting the phase shifter in the control loop, causing it to undergo self-sustained oscillations (limit cycle) of relatively low amplitude. It is shown that sustained oscillations occur at the gain crossover frequency, and that the phase margin is equal to the phase lag of the inserted circuit. A complete analysis of computing amplitude and frequency of oscillation which employs the classical sinusoidal-input describing function is also given, and the stability of limit cycle and its neighborhood using the theory of integral manifolds is included.< >

关键词： Phase shifters Nonlinear circuits Phase measurement Limit-cycles Frequency Linear systems Feedback control Circuit analysis Circuit stability Stability analysis

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On the Modelling of Planning and Supervisory Behaviour of the Navigator: An Example of the Application of Linear Optimal control Theory

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IFAC Proceedings Volumes 1989年第12期22卷 33-38页

作者： R. Papenhuijzen H.G. Stassen Institute of Mechanical Engineering TNO P.O. Box 29 2600 AA Delft The Netherlands Delft University of Technology Faculty of Mechanical Engineering and Maritime Technology Eahoratory for Measurement and Control Mekeheeg 2 2628 CD Delft The Netherlands

The development of a control theoretic model of the behaviour of a navigator, requires the solution of a control problem that is characterized by the optimal solution not being a priori known. An algorithm which features iterative application of a linear optimal control law is presented. On the basis of this technique a model of the navigator’s short term planning and supervisory behaviour has been successfully developed.

关键词： control applications control theory human factors linear optimal control nonlinear systems ship control simulation

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A nine-fold canonical decomposition for linear systems

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International Journal of control 1984年第4期39卷 779-805页

作者： H. ALING J. M. SCHUMACHER Department of Mechanical Engineering Laboratory for Measurement and Control Delft University of Technology Mekelweg 2 Delft the Netherlands Erasmus University Econometric Institute Burg. Oudlaan 50 Rotterdam the Netherlands

The zero structure for non-minimal proper systems in state-space form is investigated. The approach is ‘ geometric ’, and a complete characterization in geometric terms is given of the invariant, decoupling, system and transmission zeros, as defined by Rosenbrock. The first main result is a formula for the transmission zeros. Second, a ‘ canonical ’ lattice diagram is presented of a decomposition of the state space which can be viewed as the ‘ product ’ of the Kalman canonical decomposition and the Morse canonical decomposition. This decomposition gives a straightforward characterization of all zeros just mentioned in terms of spectral properties of subspaces under a certain class of feedback and injection mappings. Via this diagram a number of equivalent formulae for the transmission zeros are derived. The freedom in pole assignment leads to new characterizations for the invariant and system zeros in terms of greatest common divisors of characteristic polynomials. Finally, the relation is demonstrated between certain subspaces and some structural invariants, i.e. the zeros at infinity and the minimal indices of a polynomial basis for the kernel of the transfer function.

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