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TRIMARAN SHIPS - THE CONFIGURATION FOR THE FRIGATE OF THE FUTURE

NAVAL ENGINEERS JOURNAL 1995年第3期107卷 77-93页

作者： ANDREWS, DJ ZHANG, JW David Andrews:is the Professor of Naval Architecture at University College London. He is a member of the Royal Corps of Naval Constructors and has spent his career in submarine and surface ship design and procurement projects. He graduated from UCL in 1970 and obtained his MSc in Naval Architecture in 1971. During his tour year appointment to UCL as Lecturer in Naval Architecture he obtained his PhD in Naval Architecture and Ocean Engineering for his thesis ‘Synthesis in Ship Design’ in 1984. From 1986 to 1990 he was the Warship Project Manager for the Royal Navy's Replacement Amphibious Programme (LPD and LPH) and for the Aviation Training Ship (RFA ARGUS) as well as the in-service Steam Powered Warships Group. Before returning to UCL in 1993 he was the Head of Preliminary Design in the Future Projects Directorate where he was responsible for studies into future submarines and surface ships including unconventional hull forms. At UCL he directs the naval architecture undergraduate and MSc courses whilst heading up the Naval Architecture Research Group's programmes in computer aided preliminary design trimaran research combat system integration and ship design methodology. He is a Chartered Engineer and Fellow of the Royal Institution of Naval Architects for whom he Chairs the Membership Committee and is a Member of Council and the Executive Committee

This paper follows on from two previous papers from UCL. The first describes a student ship design for an advanced technology frigate, configured with three hulls, whilst the second, given by the first author's predecessor at UCL and the second author at the RINA in 1994, described the reseach undertaken at University College London into the naval architecture of Trimaran Ships. The paper commences with a resume of the origins of the Trimaran concept, its first power boat example, the Ilan Voyager, and the Advanced Technology Frigate design which adapted the trimaran configuration to a modern warship requirement. The other UCL design studies, ranging from an offshore patrol vessel to a small aircraft carrier, are outlined. The various naval architectural considerations of powering, stability, structures and manoeuvring are then described. Particular attention is focused on the seakeeping analysis which is being undertaken jointly by UCL and DRA Haslar from the autumn of 1994 although the submission date for publication precludes inclusion of model and analytical results. Finally, on work in hand, preliminary results on a spatial analysis of the Trimaran configuration and the advantages this appears to provide in a more spacious upper deck and main deck arrangement in the central portion of the ship is outlined. The paper concludes by postulating that, in respect of the capabilities likely to be most significant in the requirements for frigate designs in the future, the Trimaran would appear to have distinct advantages over the monohull and other unconventioanl hull forms.

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Adaptive multiuser detector for synchronous code division multiple access applications 13th

Adaptive multiuser detector for synchronous code division mu...

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13th International Zurich Seminar on Digital Communications, 1994

作者： Siveski, Zoran Bar-Ness, Yeheskel Chen, David W. Center for Communications and Signal Processing Electrical and Computer Engineering Department New Jersey Institute of Technology University Heights NewarkNJ07102 United States Delft University of Technology Faculty of Electrical Engineering Telecommunications and Traffic-Control Systems Group Delft Netherlands Center for Communications and Signal Processing Research NJIT NewarkNJ07102 United States

ISBN: (纸本)9783540578567

A two-stage multiuser detector for the code division multiple access environment employing a combination of a decorrelator and a nonlinear multiuser interference canceler is considered. The weights of the canceler are adaptively adjusted, thus rendering the knowledge of the received signal energies unnecessary. The probability of error is evaluated and compared to those of the decorrelator and a similar two-stage, fixed-weights scheme which requires an estimation of signal energies. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Code division multiple access

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Identification with Generalized Orthonormal Basis Functions - Statistical Analysis and Error Bounds

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IFAC Proceedings Volumes 1994年第8期27卷 1169-1174页

作者： P.M.J. van den Hof P.S.C. Heuberger J. Bokor Mechanical Engineering Systems and Control Group Delft University of Technology Mekelweg 2 2628 CD Delft The Netherlands National Institute of Public Health and Environmental Protection (RIVM) P.O. Box 1 3720 BA Bilthoven The Netherlands Computer and Automation Research Institute Hungarian Academy of Sciences Kende u. 13-17 H 1502 Budapest Hungary

A least squares identification method is studied that estimates a finite number of expansion coefficients in the series expansion of a transfer function, where the expansion is in terms of recently introduced generalized basis functions. The basis functions are orthogonal in H 2 and generalize the pulse, Laguerre and Kautz bases. One of their important properties is that when chosen properly they can substantially increase the speed of convergence of the series expansion. This leads to accurate approximate models with only few coefficients to be estimated. Explicit bounds are derived for the bias and variance errors that occur in the parameter estimates as well as in the resulting transfer function estimates.

关键词： System identification orthogonal basis functions FIR models linear regression modelling errors system approximation

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USING VIRTUAL ENVIRONMENTS IN THE DESIGN OF SHIPS

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 91-106页

作者： JONS, OP RYAN, JC JONES, GW Otto P. Jons:received a Diplom Ing. in shipbuilding from the Technical University of Hanover W. Germany and an MS in naval architecture and marine engineering from MIT. He then joined Litton Ship Systems where he was responsible for the preliminary design of the DD-963 hull structure and then for ship system integration as manager LHA ship systems engineering department. From 1972 to 1974 he was the principal research scientist at Hydronautics. In 1974 as technical director he helped establish the Crystal City office of Designers and Planners. Mr. Jons was one of the co-founders of Advanced Marine Enterprises Inc. in 1976 where he serves as corporate vice president engineering. J. Christopher Ryan:earned his bachelors and masters degrees in naval architecture from Webb Institute and MIT respectively. He spent three years at the advanced marine technology division of Litton Industries working on the DD-963 class ship design and related computer aided design projects. He subsequently went to the Navy Department concentrating on early stage design of surface combatants for twelve years including work on the FFG-7 Sea Control Ship CSGN and CVV aircraft carrier projects. He then shifted focus and became the Technical Director for the Computer Supported Design Program in NavSea for five years. Mr. Ryan has served in several supervisory positions within the Ship Design Group in NavSea since that time. He is currently the director of the future ship concepts division. Gary W. Jones:graduated from the University of Tennessee in 1971 with a BS in mechanical engineering and followed up with graduate work at George Washington University and the University of Maryland. Mr. Jones was with the Naval Sea Systems Command from 1971 until 1988 where he was a naval architect in the submarine section of the hull form design division. In 1988 he was detailed to the Defense Advanced Research Projects Agency (DARPA) where he became the program manager for the advanced submarine technology program's hydrodynamic hydroac

A major contributor to the expense and length of time to design, build, and test new systems has been the need to build and test hardware prototypes to determine their effectiveness in meeting operational requirements. Recent and dramatic advances in computer simulation technologies hold forth the promise of revolutionizing design and acquisition strategies by providing the means to validate end users' requirements prior to hardware construction. By designing and operationally testing virtual prototypes in a virtual environment, these technologies will soon offer naval architects the ability to build and launch ships in computer-based cyberspace in lieu of the shipbuilder's ways. The authors of this paper provide the background for these developments, explore the significance and ramifications of these technologies to the current process of ship and system design, outline challenges lying ahead, and present their vision and recommendations for future development.

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Open Architecture for computer-aided control engineering

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IEEE control Systems 1993年第2期13卷 17-27页

作者： Barker, H. Anthony Chen, Min Grant, Philip W. Jobling, Chris P. Townsend, Peter Control and Computer-Aided Engineering Research Group University of Wales Swansea SA2 8PP Singleton Park United Kingdom

Open systems are currently being used successfully in many areas of information technology. Some guiding principles for the design of open systems suitable for computer-aided control engineering are presented. Some possible architectures are considered and an assessment is made of the available technologies which might be suitable for the basis of an open environment for computer-aided control engineering. An analogy is made with the requirements for computer-aided software engineering, for which a reference model has already been developed, and it is concluded that such a model might well provide a clear definition of what is needed in computer-aided control engineering. © 1993 IEEE

关键词： computer architecture control engineering computing control engineering Packaging machines Open systems Software packages User interfaces Bridges Error correction Information technology

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ANALYSIS OF A MOVABLE BOUNDARY ACCESS TECHNIQUE FOR A MULTISERVICE MULTIBEAM SATELLITE SYSTEM

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INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 299-312页

作者： BOHM, S ELHAKEEM, AK MURTHY, KMS HACHICHA, M KADOCH, 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 . He is ITU's Specialist Consultant and Chief Advisor for a number of ITU/UNDP projects including VSATs Rural Networks Digital Broadc

In this paper, the performance of a new movable boundary accessing (MBA) technique for future integrated services multibeam satellite systems is studied. The multiservice environment considered includes both asynchronous and isochronous traffic consisting of video, voice, file transfer and interactive data. The movable boundary access technique proposed here will maximize the utilization of the up-link frame capacity. It is shown that the potential user population is substantially increased with the use of a moving boundary policy with minimal overhead.

关键词： MOVABLE BOUNDARY ACCESS TECHNIQUE MF-TDMA DAMA MULTIBEAM SATELLITE

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

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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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Abstract Data Types for Linear control Systems Analysis and Design

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IFAC Proceedings Volumes 1993年第2期26卷 801-804页

作者： R.B. Antonov C.P. Jobling Control and Computer-aided Engineering Research Group Department of Electrical and Electronic Engineering University of Wales Singleton Park Swansea SA2 8PP UK

This paper reports on the benefits to programmers of creating a library of abstract data types for linear algebra and computer-aided control systems analysis and design. Such a library should be easier and safer to use than the current state-of-the-art which is based on libraries of compiled FORTRAN functions. The structure of the some abstract data types for control systems is indicated and an example of their use in linear systems modelling is given.

关键词： computer-aided control system design computer-aided control engineering abstract data types numerical analysis linear algebra

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computer-aids for modelling and conceptual design

Computer-aids for modelling and conceptual design

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IEEE International Conference on Systems, Man and Cybernetics

作者： P.C. Breedveld Electrical Engineering Department Control Systems and Computer Engineering Group Control Laboratory and Mechatronics Research Centre Twente University of Twente Enschede Netherlands

The author identifies incentives for the use of computer-aids in modelling and design of physical systems and discusses possible solutions.

The author identifies incentives for the use of computer-aids in modelling and design of physical systems and discusses possible solutions.< >

关键词： Systems engineering and theory Production control systems Mechatronics Physics computing Process design Digital simulation Cultural differences Mathematics control engineering computing

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A Requirements Analysis of Future Environments for computer-aided control engineering

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IFAC Proceedings Volumes 1993年第2期26卷 1201-1204页

作者： H.A. Barker C.P. Jobling O. Ravn M. Szymkat Control and Computer-aided Engineering Research Group University of Wales Singleton Park Swansea SA2 8PP UK Institute of Automatic Control Systems Technical University of Denmark DK-2800 Lyngby Denmark Institute of Automatics Academy of Mining and Metallurgy al. Mickiewicza 30 Cracow Poland

A functional requirements analysis of the services to be provided by a framework reference model for computer-aided engineering is presented. Some indications of the technologies available for the implementation of a framework for computer-aided control engineering are given and the issues to be addressed are discussed. It is concluded that a wider discussion of both the framework reference model itself and the functional requirements, particularly from the user's perspective is needed

关键词： computer-aided control engineering software engineering object-oriented methods user interfaces

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