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WELL DECK DEPLOYABLE NAVAL COMBATANTS

NAVAL ENGINEERS JOURNAL 1994年第1期106卷 108-122页

作者： BOSWORTH, M BLACK, S MEYER, JR USN Michael Bosworth:is an engineering duty officer assigned as ship concept manager for Amphibious and Auxiliary Ships in the Naval Sea Systems Command. He graduated from the U.S. Naval Academy in 1976 with a BS degree in naval architecture and from the Massachusetts Institute of Technology in 1985 with two graduate degrees. While assigned to Naval Surface Warfare Center Carderock Division from 1988 to 1991 Cdr. Bosworth led the Carrier Dock Multimission team which conceptualized the multimission deployable vehicle. Scott Black:is a naval architect in the Propulsor Technology Branch Ship Hydromechanics Department Carderock Division Naval Surface Warfare Center. He graduated from Webb Institute of Naval Architecture in 1990 with a BS degree in naval architecture and marine engineering. Black led the MDV-SES design team for about four months while in the Ship Concepts Branch at NSWC/CD. John R. Meyer:is manager of Hydrofoil Technology in the Hydrofoil Group of the Systems Department of Carderock Division Naval Surface Warfare Center. He holds bachelors and masters degrees in Aeronautical Engineering from Rensselaer Polytechnic Institute and has done additional graduate work at the Massachusetts Institute of Technology in the same field. Meyer is president of the International Hydrofoil Society. He has written a number of papers on hydrofoils and hybrid hydrofoils and led the MDV-Hybrid Hydrofoil design team.

Small, fast surface combatants have not proven as popular to United States Naval planners as they have to planners of other navies. This paper examines the impact of this on the rate of progress of various alternative hull forms, and several reasons for this reluctance are postulated. The authors suggest that the primary reason for so few fast, small U.S. combatants is that the U.S. has a proven requirement for warships that can deploy across an ocean and remain there with only sea-delivered support for months. These warships must also be prepared to fight for extended periods of time at long distances from friendly shores. The authors recommend the use of alternative hull forms as deployable vehicles supported by a larger vessel with a floodable well deck. Various alternative hull forms are briefly discussed and several are selected for more in-depth investigation for the postulated deployable vehicle multimission requirement. Two example craft with the same set of missions are described in more detail;the multimission deployable vehicle-surface effect ship (MDV-SES) and the multimission deployable vehicle-hybrid hydrofoil (MDV-HH). These two concept level designs are described by the respective leaders of the design teams that produced David Taylor Research Center departmental Reports in the fall of 1990. Each ship displaces on the order of 400 long tons (full load), has a speed in excess of 40 knots, has a crew of 10 to 16 depending upon the mission module embarked, and can land, refuel and rearm a LAMPS III helicopter. Conclusions are drawn from the completed design work and recommendations for further study are put forth.

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IDENTIFICATION AND RESOLUTION OF PROPULSION PLANT MACHINERY PROBLEMS

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NAVAL ENGINEERS JOURNAL 1994年第2期106卷 61-68页

作者： BROWN, RW The Author:graduated from MIT with a degree in naval architecture and marine engineering. Brown began his career with Bethlehem Steel Corporation shipbuilding division in the central technical department at Quincy. He was involved in the design and construction of surface ship propulsion systems. Subsequently he began a 34 year career with the Electric Boat Division of General Dynamics where he became the chief engineer of the Design Engineering Department. During his career with Electric Boat Brown applied his technical skills to the design and construction nuclear propulsion plants and systems. Brown has taught several courses in submarine design to businesses and as an adjunct professor at the Virginia Polytechnic Institute. Currently the author is a principal engineer with Specialized System Incorporated of Mystic Ct. He is a member of ASNE a fellow of SNAME and a professional engineer.

This paper presents propulsion plant problems caused by both manufacturing and design faults. These problems have been selected from the many that developed because they required challenging engineering in both their definition and resolution. The problems described cover main propulsion shafting and bearings;propulsion turbines;ship service turbine generators;set turbines;main reduction gears;main condensers;steam distilling plants, valves and high pressure air systems. The topic discussed in that system is the identification of auto ignition in the first 4500 psig high pressure air system and its corrective action. Each problem is described both in writing and with a sketch. In all, fourteen problems are discussed.

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Division with speculation of quotient digits

Division with speculation of quotient digits

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Computer Arithmetic (ARITH)

作者： J. Cortadella T. Lang Department of Computer Architecture Polytechnic University of Catalonia Barcelona Spain Department of Electrical and Computer Engineering University of California Irvine Irvine CA USA

The speed of SRT-type dividers is mainly determined by the complexity of the quotient-digit selection, so that implementations are limited to low-radix stages. A scheme is presented in which the quotient-digit is speculated and, when this speculation is incorrect, a rollback or a partial advance is performed. This results in a division operation with a shorter cycle time and a variable number of cycles. Several designs have been realized, and a radix-64 implementation that is 30% faster than the fastest conventional implementation (radix-8) at an increase of about 45% in area per quotient bit has been obtained. A radix-16 implementation that is about 10% faster than the radix-8 conventional one, with the additional advantage of requiring about 25% less area per quotient bit, is also shown.< >

关键词： Cost function Computer architecture Delay Approximation algorithms Computer science education Hardware Error correction Redundancy Convergence

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Narrative structures within architectural videos

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Design Studies 1992年第4期13卷 355-378页

作者： Rhodes, Philip McCartney, Kevin Powell, James School of Architecture Portsmouth Polytechnic Portsmouth Hampshire United Kingdom Department of Manufacturing and Engineering Systems Brunel University Middlesex United Kingdom

This paper reports on a research programme concerning the communication of architectural information through the use of video. In recent years, the general public have become increasingly interested in and aware of architecture. This has been at least partly initiated through main stream television, and the established BBC series 'Building Sites'. This growing awareness of architecture, has provided the impetus for video to be considered as a 'new' means of communicating to architectural clients. This has in turn suggested an opportunity for architectural practices to enhance their communication to clients by the use of informative videos. If architectural videos are to be increasingly used in broadcast and for other forms of communication they should be well designed. But what is a good architectural video, and how should an architectural idealscenario be usefully portrayed in such a medium? This paper discusses the underlying structure of architectural videos as communicating media. This leads to the development of a theoretical model to aid the understanding of video communication through narrative analysis. This theoretical evaluation is bolstered by a series of empirical investigations relating to narrative reception and recall. © 1992 Butterworth-Heinemann Ltd.

关键词： architecture communication media video narrative structures

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THE USE OF PROPULSION SHAFT TORQUE AND SPEED MEASUREMENTS TO IMPROVE THE LIFE-CYCLE PERFORMANCE OF UNITED-STATES NAVAL SHIPS

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NAVAL ENGINEERS JOURNAL 1992年第6期104卷 43-57页

作者： HUNDLEY, LL TSAI, SJ Lowry L. Hundley:is a project manager/instrumentation engineer with the Hydromechanics Department at the Carderock Division Naval Surface Warfare Center. His 25 years of experience include the planning and directing of sea trials on Navy Coast Guard and commercial ships. Mr. Hundley has been responsible for assessing and improving the methods used to collect and analyze ship powering and maneuvering data. He received a B.S. degree in electrical engineering from Virginia Polytechnic Institute in 1967 and is a member of ASNE. Shou-Jen Tsai:is a naval architect with the Full-Scale Trials Branch Ship Hydromechanics Department at Carderock Division Naval Surface Warfare Center. His 20 years of experience include ship repair and computer-aided ship design and performance analysis. He is a licensed marine engineer with 5 years of shipboard operation experience. Mr. Tsai received a B.S. degree in naval architecture from Taiwan Provincial College of Marine and Oceanic Technology in 1970 and a master's degree in ocean engineering from Stevens Institute of Technology in 1980.

This paper describes the benefits of having permanent torsionmeters installed on the main propulsion shafting of U. S. naval ships. Propulsion shaft torque and speed measurements provide ship operators with accurate knowledge of the ship's powering condition at any given time. This information can be compared with baseline data to reveal degradation in the ship's powering performance. Performance trends produced by observations over an extended period of time can be utilized to forecast the point at which corrective action should be taken. The timely implementation of necessary corrective action can significantly decrease the ship's operating cost by reducing fuel consumption while minimizing excessive wear on the ship's machinery and, in all probability, extend the ship's service life. The value of accurate powering measurements is discussed in conjunction with (1) the accumulation and removal of hull and propeller marine growth, (2) single shaft operation, and (3) ships equipped with controllable pitch propellers. An overview of modern torsionmeters is presented based on literally hundreds of sea trials involving personnel from the Carderock Division. Naval Surface Warfare Center. Development of an overall program is suggested to ensure that (1) only accurate and reliable torsionmeters are installed on U. S. naval ships, (2) the meters are properly maintained and monitored, and (3) full utilization is made of the data obtained and of the baseline data currently available.

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A comparison of redundant CORDIC rotation engines

A comparison of redundant CORDIC rotation engines

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IEEE International Conference on Computer Design: VLSI in Computers and Processors, (ICCD)

作者： J.A. Harding T. Lang J.-A. Lee UCLA Computer Science Department University of California Los Angeles USA Department of Computer Architecture Polytechnic University of Catalunya Barcelona Spain Department of Electrical Engineering University of Houston USA

The CMOS implementation of two high performance rotation processors using redundant CORDIC are reviewed and compared. One of the designs uses a variable scaling factor while the other is with constant scaling. The lat... 详细信息

关键词： Engines Matrix decomposition Arithmetic Difference equations Computer science Computer architecture CMOS process Parallel architectures Algorithm design and analysis Throughput

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Thermal comfort studies and applications for Dhaka

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Building Services engineering Research & Technology 1990年第3期11卷 105-108页

作者： Ahmed, Z.N. Howarth, A.T. Zunde, J.M. Department of Architecture Bangladesh University of Engineering and Technology Dhaka Bangladesh School of Construction Sheffield City Polytechnic Sheffield S1 1WB United Kingdom

In countries with hot climates, thermal comfort always depends on the acquired tolerance of people to the prevailing conditions, and from this stems their perceived comfort level indoors. Comfort evaluation must allow for acclimatisation if economic environmental control systems are to be specified. Previous comfort studies are critically evaluated for application to the Bangladesh climate. The most appropriate findings are summarised and considered in the context of local vernacular design and social requirements. © 1990, Sage Publications. All rights reserved.

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DOMESTIC KITCHEN EXTRACT FANS - EFFECTIVENESS IN SURFACE CONDENSATION PREVENTION

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BUILDING AND ENVIRONMENT 1989年第4期24卷 335-345页

作者： BOYD, D COOPER, P School of Architecture Birmingham Polytechnic Birmingham B42 2SU Perry Barr United Kingdom Department of Mechanical Engineering University of Wollongong Wollongong NSW 2500 PO Box 1144 Australia

Many authorities propose domestic kitchen extract fans as effective measures against surface condensation. This paper describes field study, and computer modelling, work to improve quantitative information for fan specification. A detailed computer model is described and used to determine air flows, humidity levels and condensation quantities with different fans and humidistat or manual control. Conclusions are that: low rate fans are unable to prevent condensation; condensation is difficult to remove once present even with extended running from humidistat control; moisture migration through open doors cannot be prevented because of thermally induced air movement and full transient analysis is essential in assessing mould risk.

关键词： Kitchens

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U. S. NAVAL ACADEMY'S NEW YARD PATROL CRAFT: FROM CONCEPT TO DELIVERY.

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Naval Engineers Journal 1987年第1期99卷 37-58页

作者： Compton, Roger H. Chatterton, Howard A. Hatchell, Gordon McGrath, Frank K. Roger H:. Compton is a Webb graduate who since 1966 has been a part of the naval architecture faculty at the U.S. Naval Academy. Since accepting the appointment to the Academy he has been instrumental in establishing the ABET accredited major program in naval architecture in the conceptual design and operation of the Naval Academy Hydromechanics Laboratory and in the conceptual design of the 108-ft yard patrol craft. Besides his Naval Academy involvement he serves as an adjunct professor with Virginia Polytechnic Institute in its NAVSEA Institute graduate program at Crystal City. He is an active member of both ASNE and SNAME and has published technical papers with both societies. Howard A. Chatterton:began his career as a Navy coop student at the Boston Naval Shipyard in 1960. He received his bachelor's degree in naval architecture and marine engineering from Massachusetts Institute of Technology in 1966 and his master's degree in 1968. He was employed by the Preliminary Design Division of BuShips in the submarine design and hydrofoil design groups until 1972 when he joined the Coast Guard's Naval Engineering Division. He remained with the Design Branch until 1981 when he accepted a faculty position at the U.S. Naval Academy as the research director for the Academy's hydromechanics laboratory. He has recently returned to Coast Guard Headquarters as the assistant chief Naval Architecture Branch Office of Merchant Marine Safety. Gordon Hatchell:is a naval architect at the Naval Sea Combat Systems Engineering Station Norfolk Virginia in the Combatant Craft Engineering Department. He served as lead-ship YP project engineer from its inception to delivery and continues to serve as project coordinator on follow-up ship procurements. He has worked on other boat procurements as well as serving as weight and stability coordinator. Mr. Hatchell began his engineering career in the Design Division at the Norfolk Naval Shipyard in Portsmouth Virginia after receiving a BS in civil engineering from Virginia Polytec

The design of the new 108-ft yard patrol craft (YPs) for the U. S. Naval Academy is described from its beginnings as a senior midshipman design project, through its preliminary and contract design development at the U. S. Navy's small craft design team headquarters, Naval Sea Combat Systems engineering Station, Norfolk, Virginia (NAVSEACOMBAT-SYSENGSTA-Norfolk). During preliminary and contract design the Naval Academy Hydromechanics Laboratory (NAHL) provided experimental data to support NAVSEA-COMBATSYSENGSTA-Norfolk's design analyses in powering, seakeeping, and maneuvering. Several tradeoff studies of interest to patrol craft designers are presented. Major events in the detail design and construction of the first boat are described from both the designer's and the shipbuilder's points of view. The launching, builder's and sea trials of the first boat are described.

关键词： NAVAL VESSELS

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VIBRATION OF HEMI-ELLIPSOIDAL AXISYMMETRICAL DOMES SUBMERGED IN WATER

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PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL engineering SCIENCE 1986年第6期200卷 389-398页

作者： ROSS, CTF JOHNS, T Department of Mechanical Engineering and Naval Architecture Portsmouth Polytechnic

Ten thin-walled domes, of hemi-ellipsoidal form, were vibrated in air and while partially and fully submerged in water. The domes varied in shape from oblate ones of aspect ratio (AR) 0.25 to prolate ones of aspect ratio *** fundamental modal patterns for the oblate domes tended to be of axisymmetric form, while the fundamental modal patterns of the hemispherical and prolate domes tended to be of asymmetric or lobar *** theoretical analysis was carried out by the finite element method, where the motion of the shell structure was represented by three different types of element and the motion of the water was represented by a solid annular *** between theory and experiment was found to be good.

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