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Optimal Smoothing of Empirical Bode Plots by Hilbert Transform Reciprocation

IFAC Proceedings Volumes 1982年第4期15卷 373-378页

作者： D. Zes W. Bass Hughes Helicopters Culver City CA 90230 USA Litton Guidance & Control Systems Woodland Hills CA 91365 USA

Measurement errors corrupting the data of an empirical Bode plot of a causal system (log-amplitude and phase, versus frequency) can be minimized by taking into account the theoretical redundancy of such data in the ideal (noise-free) case, wherein each plot is the Hilbert transform of the other. An explicit closed-form analytical solution of the problem of least-mean-square fit of reciprocal Hibert-transform pairs to the measured data is derived, and illustrative examples are presented.

关键词： Smoothing Bode diagrams data reduction and analysis Hilbert transforms automatic testing control engineering computer applications Fourier transforms frequency response filtering identification least squares approximations optimal filtering signal processing spectral analysers stochastic systems

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G7.2: Design Considerations for Microprocessor Based controllers

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IFAC Proceedings Volumes 1980年第9期13卷 451-456页

作者： A.H. Glattfelder F. Huguenin W. Schaufelberger Escher Wyss A G. Zürich Switzerland Swiss Federal Institute of Technology Zürich Switzerland

A top-down design procedure for the early stages of a microprocessor based controller design problem is presented in this paper. Problem definition and preliminary design are treated. Information structure, algorithms, software and hardware have to be evaluated, assessed and chosen in this phase. Two examples demonstrate how the process can be applied to actual problems

关键词： computer control computer selection and evaluation control engineering computer applications Digital control Industrial control Microprocessors Process control Systems engineering

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PLC's into Offshore Shut-Down Systems

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IFAC Proceedings Volumes 1983年第18期16卷 201-206页

作者： P. Chamoux O. Schmid Société Nationale Elf Aquitaine (Production) 26 Avenue des Lilas 64018 Pau Cedex France

Programmable Logical controller based safety systems are spreading in the oil industry. Provided that some precaution are taken, PLC's can lead to good level of safety and fairly low rate of spurious shutdowns. However, some advances have to be made in the field of built-in self-monitoring devices, especially for input and output cards.

关键词： controllers control engineering computer applications Oil technology Reliability theory

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Recent Advances in the L-A-S Software used in CAD of control Systems

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IFAC Proceedings Volumes 1985年第8期18卷 145-150页

作者： S.P. Bingulac P.J. West W.R. Perkins Electrical Engineering Department Virginia Polytechnic Institute and State University Blacksburg VA 24061 USA Coordinated Science Laboratory and Department of Electrical and Computer Engineering University of Illinois Urbana IL 61801 USA

This paper reviews the basic features of a high-level, interactive, conversational language called L-A-S (Linear AIgebra and Systems). Particular emphasis is placed upon recent developments of this computer-Aided Design (CAD) language. Unlike the conventional menu-driven approach of many CAD packages, L -A -S provides the user with considerable flexibility in the development and maintenance of linear algebra and control algorithms. L-A-S is both a language and an interpreter. Users or L-A-S write programes while interacting with the Interpreter. Programs may he edited, stored, recalled, and executed with the same or a differernt data set. L-A-S data strunures include matrices, polynomials (continuos or discrete). and matrices of polynomials. In this paper. we briefly review the basics or the L-A-S language. Then. we concentrate on those features of L-A-S which have been added within the last year. These include the Multiple Operator Statement (MOS), L-A-S lNT-delined suhroutines. and the most-reccnt “echo” feature for interaction with the interpreter. Example, accompany the text to illustrate each new feature.

关键词： computer-aided Design Programming Languages control engineering computer applications control System Analysis/Synthesis

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Computing Optimal controls for Systems with State and control Constraints

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IFAC Proceedings Volumes 1989年第2期22卷 67-72页

作者： I. Troch F. Breitenecker M. Graeff University of Technology Vienna Austria

Methods for computing optimal controls are reviewed and compared in view of their applicability for solving real world problems. Parametrization is presented as valuable and powerful tool to derive solutions being rea... 详细信息

关键词： control engineering computer applications Nonlinear programming Optimal control Optimisation State-space methods

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Automatic Synthesis of a Packaged Program for Real Time Technological Process control

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IFAC Proceedings Volumes 1979年第7期12卷 285-298页

作者： I. Hantuch Institute of Technical Cybernetics Slovak Academy of Sciences Bratislava Czechoslovakia

This contribution refers to certain problems bearing upon the formation of a system generator programing medium of an automatic synthesis for the modular construction of a packaged program for real time technological process control. The package is made up of standard subroutines-functional modules, carrying out the basic control functions. The user defines the task in the problem-oriented "graf language" designed by an analysis of project documentation for automated systems of technological process control. From the viewpoint of software, this is an establishment of a communication and synchronization system, implemented by standard connectors and starting subroutines, operating over the central database and by a system of tables for recording required items of information on the structure of the control package.

关键词： control system synthesis control engineering computer applications programing languages real time applications

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Identification of Coherent Machine Groups in Electric Power Systems

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IFAC Proceedings Volumes 1979年第5期12卷 241-247页

作者： E. Ruppert Filho Electrical Engineering Department of FEC/UNICAMP - Campinas - SP - Brasil

This paper describes a method to make fast and reliable the identification of coherent machine groups for Electric Power Systems dynamic equivalents construction to be used in planning studies and in on-line dynamic security, may be. The method is based on Lyapunov Direct Method and uses some simplifications on the nodal bus admittance matrix of reduced to generation buses system.

关键词： Computational methods control engineering computer applications dynamic stability Lyapunov method nonlinear systems power system control

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Instructional computer Graphics in control System Design

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IFAC Proceedings Volumes 1979年第7期12卷 641-647页

作者： M.J. Wozny Interactive Computer Graphics Center Rensselaer Polytechnic Institute Troy New York U.S.A.

The world-wide demand for increased industrial productivity has created a critical need for engineers trained in computer graphics and computer-aided design. Rensselaer Polytechnic Institute is the first U.S. university to make a major commitment to computer graphics and CAD by establishing a 1.2 million dollar Center for Interactive computer Graphics in the School for Engineerina. This paper explores the role of interactive computer graphics for instruction and design in control, based on the experiences gained at RPI.

关键词： computer-aided design computer-aided instruction computer graphics control engineering computer applications educational aids feedback optimal control

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The L-SAT Attitude and Orbit control Subsystem

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IFAC Proceedings Volumes 1983年第11期16卷 47-56页

作者： J.W. Pengelly E. Fyfe A.J. Rogers Electronics Department Space and Communications Division British Aerospace Dynamics Group Stevenage Herts UK

The control system adopted for L-SAT is based on a zero-momentum concept relatively insensitive to spacecraft configuration changes. This flexibility is further enhanced by the use of a microprocessor based controller. The overall AOCS configuration adopted is described, the theoretical design aspects outlined and the functions and implementation of the controller discussed. The subsystem electronic configuration concentrates the majority of control sequence algorithm implementation, telemetry, telecommand and power control into the controller. This unit communicates to other subsystem equipments through use of a high reliability serial data bus. A similar data bus is used internally in the controller providing a highly modular design concept which enables a wide range of applications to be met using the flexibility of software.

关键词： Attitude control control engineering computer applications Digital control Microprocessors Space Vehicles

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Train Simulator

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IFAC Proceedings Volumes 1990年第2期23卷 155-161页

作者： S. Colombi Swiss Federal Institute of Technology Industrial Electronic Laboratory DE-Ecublens. 1015 Lausanne Switzerland

This paper describes a realtime digital train simulator which was realized to develop real braking devices. The main originalities of this simulator consists in the solutions introduced in order to allow a true simulation of the reality at reasonable price. In particular, in the modelling, we simplified the coupling static characteristics. This made it possible an analytic solution of the motion and coupling equations and therefore a reduction of the computing power requirements. On the other hand, to limit the hardware cost, we adopted a multiprocessor architecture where the simulation processors work in pipeline.

关键词： control engineering computer applications Modelling Nonlinear equations Numerical methods Convergence of numerical methods Multiprocessor architecture Parallel processing

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