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PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

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A High Precision Synchronizing control System for Biaxial Positioning Tables

A High Precision Synchronizing Control System for Biaxial Po...

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American control Conference (ACC)

作者： S. M. Shahruz A. K. Pradeep Berkeley Engineering Research Institute Berkeley CA USA Control Systems Laboratory General Electric Corporate Research and Development Center Schenectady NY USA

In this paper, a control system is designed that synchronizes the motions of biaxial positioning tables. The control system consists of nonlinear feedback laws of the displacements and the velocities of the table along its axes. The designed control system successfully generates desired contours on the workpiece by synchronizing the motions of the biaxial table along its axes, and compensates for the effects of parametric uncertainty and disturbance to the system.

关键词： control systems Velocity control Tellurium Motion control Machining Torque Tin

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A smooth variable structure position control of PCB motor

A smooth variable structure position control of PCB motor

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1992 Singapore International Conference on Intelligent control and Instrumentation

作者： Paul, A.K. Bandyopadhyay, B. Srisailam, M.C. Divn. of Remote Handling and Robotics Bhabha Atomic Research Center Bombay400085 India Systems and Control Engg. Dept. of Electrical Engineering Indian Institute of Technology Bombay Bombay400076 India

ISBN: (纸本)0780306325

This paper presents a mew algorithm for variable structure control systems. In the proposed algorithm a VEViable strnctnre controller for low moment of inertia systems has been discnssed. The concept nses the position and velocity loop independently at different instants of time. Switching from position loop to velocity loop generates sliding mode motion. The proposed method requires only one switching. Chattering is totally absent. The algorithm has been tested successfully in printed circuit DC motor throngh computer simulation aa well as practical implementation. The practical controller is a hybrid one where adog, digital and au IBM PC has been used to verify the concept. © 1992 by IEEE Singapore Section.

关键词： controllers

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A Smooth Variable Structure Position control Of PCB Motor

A Smooth Variable Structure Position Control Of PCB Motor

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Singapore International Conference on Intelligent control and Instrumentation, SICICI

作者： A.K. Paul B. Bandyopadhyay M.C. Srisailam Divn. of Remote Handling and Robotics Bhabha Atomic Research Centre Mumbai India Systems and Control Engineering Department of Electrical Engineering Indian Institute of Technology Bombay Mumbai India

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ALV NAVIGATION USING TERRAIN DATABASES

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JOURNAL OF NAVIGATION 1991年第1期44卷 48-57页

作者： BLACKMAN, CP MACLACHLAN, IR (Royal Armament Research and Development Establishment) (Marconi Command and Control Systems Ltd. but currently seconded to the Royal Armament Research and Development Establishment as part of the Mobile Advanced Robotics Defence Initiative)

A navigation strategy for an autonomous land vehicle (ALV) based on the Defence Geographic Database is currently being developed under the auspices of the Mobile Advanced robotics Defence Initiative (MARDI). The database is hierarchically structured, and supports the storage of an unlimited number of attributes for each geographical feature. It also expressly identifies the interconnectivity of adjacent features, making it ideal for automatic route calculation. Tactical battlefield information is being combined with the database resulting in a composite link-node map which will be searched for optimum routes using standard algorithms. Both military and geographical criteria will be simultaneously optimized. Waypoints suitable for machine vision techniques will also be extracted and used to confirm the ALV location.

关键词： LAND NAVIGATION DIGITAL MAPS EXPERT systems

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A smooth variable structure position control of dc motor

A smooth variable structure position control of dc motor

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1991 IEEE Region 10 International Conference on EC3-Energy, Computer, Communication and control systems, TENCON 1991

作者： Paul, A.K. Bandyopadhyay, B. Srisailam, M.C. Div of Remote Handling and Robotics Bhabha Atomic Research Centre Bombay400085 India Systems and Control Engg Deptt. of Elec. Engg. Indian Institute of Technology Powal Bombay400 070. India

ISBN: (纸本)0780305388

Variable structure control using sliding mode technique has been widely used for different electrical motors in position loop. Its advantages are insensitivity to parametric variations and ability to reject disturbances like sudden load applied to the motor shaft. However, for a low inertia systems it exibibits more chattering. In this paper, a sliding mode controller for a very low inertia system (Printed circuit motor) is proposed. A new chattering reduction technique is also proposed here. controller structure is a hybrid one where analog circuit has been reduced to a minimum level. Computer simulation as well as experimented results are presented to verify the chattering reduction technique. © 1991 IEEE.

关键词： Printed circuit motors

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CAE Tools for Nonlinear systems Analysis and Design Based on Sinusoidal-Input Describing Functions

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IFAC Proceedings Volumes 1991年第4期24卷 89-94页

作者： J.R. O'Donnell J.H. Taylor Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180-3590 USA Control Systems Laboratory General Electric Corporate Research and Development P. O. Box 8 Schenectady NY 12301 USA

We report on recent progress in the development of a computer-aided engineering (CAE) environment for nonlinear control system analysis and design based on sinusoidal-input describing function (SIDF) methods. Several major additions have been made to our nonlinear controls CAE software: ACSL macros were developed to allow the generation of SIDF models of nonlinear plants in a manner analogous to that of the SIMNON-based software developed earlier, and MATLAB routines were developed for the analysis of these models and for the design of general nonlinear controllers based on them. This software provides an integrated tool set for treating very general nonlinear systems with no restrictions on system order, number of nonlinearities, configuration, or nonlinearity type. Based on the new software presented here, the use of SIDF-based nonlinear control system analysis and design methods is substantially easier to carry out and more powerful than before

关键词： Nonlinear control systems describing functions control system design computeraided design computer software

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AN OVERVIEW OF CURRENT AND CANDIDATE TITANIUM-ALLOY APPLICATIONS ON UNITED-STATES-NAVY SURFACE SHIPS

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 175-191页

作者： SCHUTZ, RW SCATURRO, MR Ronald W. Schutzis manager of industrial research and development for RMI Titanium Company in Niles Ohio. He has held his current position since September of 1989. Prior to this appointment Mr. Schutz was employed by TIMET Corporation in the Henderson Technical Laboratory for 14 years involved with corrosion research and development of titanium alloys for industrial applications. Mr. Schutz has authored more than 25 papers on the corrosion behavior and industrial applications of titanium alloys. He received his B.S. degree in chemistry and M.S. degree in inorganic electrochemistry from Rensselaer Polytechnic Institute in Troy N.Y. He was a recipient of the NACE A.B. Campbell Award in 1981 and is a member of NACE ASTM and ASNE. Milton R. Scaturrois a licensed engineer in both California and Canada with over 35 years experience in design and manufacturing. Since joining the Naval Ship Weapons Systems Engineering Station in Port Hueneme Calif in 1968 he has specialized in the development and application of corrosion control techniques on naval ships weapons systems and electronic ship systems. He studied mechanical engineering at City College of New York and is a Certified Manufacturing Engineer and a member of NACE and ASNE.

A significant number of current and candidate Navy surface ship applications for titanium alloys are identified and reviewed in this paper. These applications represent very viable, practical engineering solutions to current limitations and problems on current ships, and improvements proposed to address modern Navy aims. These fundamental aims include improved ship performance, availability, payload, mobility, and survivability. A thorough discussion of relevant mechanical, physical, and corrosion properties of candidate titanium alloys is made along with how these properties impact design, fabricability, and performance of specific ship structures and systems. An update of the status of these ship applications and corresponding Navy evaluation programs is also provided.

关键词： Titanium and Alloys

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Synthesis of Nonlinear controllers with Rate Feedback via Sinusoidal-Input Describing Function Methods

Synthesis of Nonlinear Controllers with Rate Feedback via Si...

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American control Conference (ACC)

作者： James H. Taylor James R. O'Donnell Control Systems Laboratory General Electric Corporate Research and Development Schenectady NY USA Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

In this paper, we report on recent advances in the design of fully nonlinear controllers for amplitude-sensitive nonlinear plants using sinusoidal-input describing function methods. This work includes the development of a new nonlinear controller synthesis approach that includes derivative action in an inner-loop feedback path (nonlinear rate feedback), and its application to a motor + load model with torque saturation and stiction. This approach is capable of treaing nonlinear systems of a very general nature, with no restrictions as to system order, number of nonlinearities, configuration, or nonlinearity type; additionally, the techniques can be generalized for the design of nonlinear controllers of different structures. The end result is a closed-loop nonlinear control system that is relatively insensitive to reference-input amplitude.

关键词： Feedback control system synthesis Nonlinear control systems Signal synthesis Three-term control Load modeling Nonlinear systems control systems Laboratories research and development

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Computer-aided control Engineering Environments: Architecture, User Interface, Data-base Management, and Expert Aiding

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IFAC Proceedings Volumes 1990年第8期23卷 337-348页

作者： J.H. Taylor D.K. Frederick C.M. Rimvall H.A. Sutherland Control systems Laboratory GE Corporate Research and Development P.O. Box 8 Schenfctady NY 12301 USA Dept. of Electrical Computer andd Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 USA

Modern CAD environments for control systems engineering have begun to support substantial functionality beyond modeling, numerical analysis, and simulation. Three major areas that have emerged in the last five years are advanced user interfaces, data-base management, and expert-systems support ("expert aiding"), In addition, there has been a steady thrust to integrate more completely the various functionalities and software that comprise computer-aided control engineering (CACE). These trends have produced CACE environments which have relatively modest improvements in numerical quality but a vastly different "feel" in terms of integration, support, and "user friendliness. The basic considerations and requirements for a CACE user interface (UI), data-base manager (DBM), and expert aicling are discussed in detail. In many cases, these will be illustrated by examples based on various CACE software suites including the new GE MEAD CACE environment; the basic thrust will be to define needs and show how these can be met. The GE MEAD Project involves the integration of powerful CACE packages under a supervisor which coordinates the execution of these packages with a modern UI, a CACE-oriented DBM, and an expert system. The user interface is designed to facilitate access to the CACE package capabilities by users with widely different levels of familiarity with the environment. The data-base manager keeps track of system models that evolve over time and associates each analysis or design result with the correct model instance. The expert system supplies the machinery for expert aiding complicated or heuristic procedures to free the user from low-level detail and tedium. This system thus exemplifies the trends mentioned above

关键词： Computer-aided system design computer interfaces for CAD control engineering applications of computers data-base management systems expert systems software tools

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