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RACER - A DESIGN FOR MAINTAINABILITY

NAVAL ENGINEERS JOURNAL 1985年第5期97卷 139-146页

作者： DONOVAN, MR MATTSON, WS Michael R. Donovanis a 1974 graduate of the United States Naval Academy where he received his undergraduate degree in naval architecture. In 1975 he received a master of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. After completing the Navy's nuclear power training program he served as machinery division officer in USSBainbridge (CGN-25) and chemistry and radiological controls assistant in USSLong Beach (CGN-9). He successfully completed the Navy's surface warfare officer qualification and passed the nuclear engineer's examination administered by Naval Reactors. He was then assigned to the Ship Design and Engineering Directorate (SEA-05) Naval Sea Systems Command as head systems engineer on the DDG-51 ship design project where he received the Navy Commendation Medal for outstanding performance. He is currently with Solar Turbines Incorporated as manager ship integration and integrated logistic support for the Rankine cycle energy recovery (RACER) system. Mr. Donovan has lectured at Virginia Polytechnic Institute teaching marine engineering and has given presentations on ship design at various symposiums and section meetings for both ASNE and SNAME. He has been a member of ASNE and SNAME since 1972 and is registered as a professional engineer in California and Virginia. Wayne S. Mattsonreceived his B.S. degree in mechanical engineering from Western New England College in 1972. Following graduation he attended Naval Officer Candidate School and was subsequently assigned as a project officer to COMOPTEVFOR where he was responsible for technical and operational test plans their execution and final equipment appraisal. Following a tour as engineering officer aboard the USSNespelen (AOG-55) he was assigned as commissioning MPA aboard the USSElliot (DD-967) the fifthSpruanceclass destroyer. For the past six years he has been employed by Solar Turbines Incorporated in program management within the advanced development department. He is currently

There is a great deal of emphasis currently in the Navy on the issues of reliability and maintainability. If a system or component is out of commission, it obviously cannot perform its mission. Thus, systems and components must be reliable, with low failure rates, and maintainable, with short repair times when the system does become inoperable. To be effective, these attributes must be incorporated into new ship systems early in the design stage. The Rankine cycle energy recovery (RACER) system is a heat recovery steam cycle designed to recover energy from the exhaust of an LM2500 gas turbine for augmentation of a ship's propulsion system. The RACER system provides several advantages to a gas turbine powered ship, one of which is improved fuel efficiency for significant annual fuel savings. This saving does not come free, however, since, in general, any additional system installed in the ship will have some maintenance requirements. In keeping with the Navy's current emphasis, a key philosophy in the design of the RACER system has been to minimize this maintenance burden. After a brief description of the RACER system and its design philosophy, the techniques being used during the design phase to minimize the maintenance burden on the fleet are presented. Trade-off studies concerning acquisition versus life-cycle costs, including fuel and maintenance costs, are discussed. Innovations incorporated into this state-of-the-art system are reviewed with an emphasis on design for affordability.

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FUTURE PROPULSION MACHINERY TECHNOLOGY FOR GAS-TURBINE POWERED FRIGATES, DESTROYERS, AND CRUISERS

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NAVAL ENGINEERS JOURNAL 1984年第2期96卷 34-46页

作者： BASKERVILLE, JE QUANDT, ER DONOVAN, MR USN The Authors Commander James E. Baskerville USNis presently assigned to Naval Sea Systems Command (NA VSEA) as the Ship Design Manager for the DDG 51 the Navy's next generation surface combatant. A graduate of the U.S. Naval Academy Class of 1969 he is a qualified Surface Warfare Officer and designated Engineering Duty Officer (ED). He received his M.S. degree in Mechanical Engineering and his professional degree of Ocean Engineer from the Massachusetts Institute of Technology (MIT) and holds a patent right on an Electronic Control and Response System. His naval assignments include tours in USSRamsey (FFG-2) Aide and Flag Lieutenant to the Commander Naval Electronic Systems Command and Ship Superintendent Surface Type Desk Officer and Assistant Design Superintendent at NA VSHIPYD Pearl Harbor. He was awarded the Meritorious Service Medal for distinguished performance at Pearl Harbor Naval Shipyard. As an author he has contributed articles to the ASNEJournaland given presentations at local sections on ship design the use of innovative technology in ship repair and maintenance and the costs and risks associated with engineering progress. Commander Baskerville is a registered Professional Engineer in the State of Virginia an adjunct professor teaching marine engineering at Virginia Tech. and in addition to ASNE which he joined in 1975 is a member of SNAME Tau Beta Pi Sigma Xi ASME and the American Society of Heating Refrigeration and Air Conditioning Engineers (ASHRAE). Dr. Earl R. Quandt:received his degree of Chemical Engineer from the University of Cincinnati in 1956 and his Ph.D. degree in Chemical Engineering from the University of Pittsburgh in 1961. He worked in the naval reactors program at the Bettis Atomic Power Laboratory from 1956 to 1963. Since that time he has been with David Taylor Naval Ship Research and Development Center Annapolis Maryland where he is Head of the Power Systems Division. He contributed to this paper while on a one year assignment to the U.S. Naval Academy as V

A turning point occurred in naval engineering in 1972 when the U.S. N avy chose to use marine gas turbines for the propulsion of its new SPRUANCE and PERRY Class ships. This paper reviews the more than twenty years of experience with turbine technology and its design integration into combat ships needed to make that decision. It is concluded that the availability of a good second generation aircraft derivative engine with proven reliability and a strong commercial base, i.e., the LM-2500, was as important to the decision as was the predicted improved ship effectiveness and cost benefits. This paper discusses improvements that can be made to the twin engine, single gear, single propeller shaft system. Focusing only on this mechanical transmission concept, it addresses the impact of possible improvements to the engine, gear, and shafting. In particular, the paper discusses current LM-2500 related R&D efforts to: (a) obtain improved part-power fuel rates, (b) integrate with a reversing reduction gear, and (c) add on a waste heat recovery steam cycle. Looking ahead to the year 2000, this paper suggests that a successor to the ubiquitous LM-2500 will appear in the 15 MW power range to provide the next step in the evolution of the twin engine package. This new naval engine will most likely be based on an aircraft core that exists at present, such that it will have demonstrated its reliability and commercial potential through many hours of testing prior to its mid-1990 marine conversion. This new engine is expected to offer improved air flow, an excellent fuel rate (approaching a flat 0.30 LB/HP-HR), and effective maintenance monitoring, all at some expense in size, weight, and cost. The year 2000 engine will burn a liquid hydrocarbon fuel similar to JP-5 because of its aircraft origins. Combined with advances in gear and shafting technology, the full twin engine propulsion system of the year 2000 should be markedly lighter, smaller, and more efficient than today's units.

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A COMPUTER-MODEL FOR SHIPBOARD ENERGY ANALYSIS

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NAVAL ENGINEERS JOURNAL 1984年第5期96卷 33-45页

作者： DETOLLA, JP FLEMING, JR Joseph DeTolla:is a ship systems engineer in the Ship Systems Engineering Division SEA 56D5 at the Naval Sea Systems Command. His career with the Navy started in 1965 at the Philadelphia Naval Shipyard Design Division. In 1971 he transferred to the Naval Ship Engineering Center. He has held positions as a fluid systems design engineer and auxiliary systems design integration engineer. Mr. DeTolla has worked extensively in the synthesis and analysis of total energy systems notably the design development of the FFG-7 class waste heat recovery system. He is NA VSEA's machinery group computer supported design project coordinator and is managing the development of a machinery systems data base load forecasting algorithms and design analysis computer programs. Mr. DeTolla has a bachelor of science degree in mechanical engineering from Drexel University and a master of engineering administration degree from George Washington University. He is a registered professional engineer in the District of Columbia and has written several technical papers on waste heat recovery and energy conservation. Jeffrey Fleming:is a senior project engineer in the Energy R&D Office at the David Taylor Naval Ship R&D Center. In his current position as group leader for the future fleet energy conservation portion of the Navy's energy R&D program he is responsible for the identification and development of advanced components and subsystems which will lead to reductions in the fossil fuel consumption of future ships. Over the past several years he has also directed the development and application of total energy computer analysis techniques for the assessment of conventional and advanced shipboard machinery concepts. Mr. Fleming is a 1971 graduate electrical engineer of Virginia Polytechnic Institute and received his MS in electrical engineering from Johns Hopkins University in 1975. Mr. Fleming has authored various technical publications and was the recipient of the Severn Technical Society's “Best Technical Paper of the Year” award in 1

In support of the Navy's efforts to improve the energy usage of future ships and thereby to reduce fleet operating costs, a large scale computer model has been developed by the David Taylor Naval Ship Research and Development Center (DTNSRDC) to analyze the performance of shipboard energy systems for applications other than nuclear or oil-fired steam propulsion plants. This paper discusses the applications and utility of this computer program as a performance analysis tool for design of ship machinery systems. The program is a simulation model that performs a complete thermodynamic analysis of a user-specified energy system. It offers considerable flexibility in analyzing a variety of propulsion, electrical, and auxiliary plant configurations through a component building block structure. Component subroutines that model the performance of shipboard equipment such as engines, boilers, generators, and compressors are available from the program library. Component subroutines are selected and linked in the program to model the desired machinery plant functional configurations. The operation of the defined shipboard energy system may then be simulated over a user-specified scenario of temperature, time, and load profiles. The program output furnishes information on component operating characteristics and fuel demands, which allows evaluation of the total system performance.

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HIGH-SPEED VELOCITY LOG

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NAVAL ENGINEERS JOURNAL 1982年第4期94卷 43-48页

作者： BARNETT, NJ CHENEY, SH Neal J. Barnett:holds a Bachelor of Mechanical Engineering degree from the City College of New York February 1967 and a Master of Science degree in Applied Mechanics from the Polytechnical Institute of Brooklyn May 1972. He is a member of Tau Beta Pi the National Engineering Honor Society Pi Tau Sigma the National Mechanical Engineering Honor Fraternity and the ASME the American Society of Mechanical Engineers. Mr. Barnett has been a civilian employee of the Navy Department since 1967 and is currently employed as a navigation systems engineer at the Naval Air Development Center Warminster Pa. For the past nine years Mr. Barnett has specialized in and has been technically responsible for the development of ship and submarine speed sensors for U.S. Navy Fleet applications. Samuel H. Cheney:holds a Bachelor of Science in Electrical Engineering degree from Drexel University Philadelphia Pa. June 1974 where he specialized in electronics and communications. He is a member of the Institute of Electrical and Electronics Engineers (IEEE). Mr. Cheney is currently employed as an Electronics Engineer at the Naval Air Development Center (NAVAIRDEVCEN) Warminster Pa. where he is currently assigned as Project Engineer for the High Speed Velocity Log Program prior to coming to NAVAIRDEVCEN in September 1977 he was employed by the Department of the Army Frankford Arsenal where he was involved in development of electronic fire control systems.

Advanced high speed ships (surface effect ships, hydrofoils and air cushioned vehicles) under development will operate at speeds which are considerably higher than conventionally hulled ships. Precise velocity sensing and measuring techniques that provide the required accuracy throughout their operating speed range do not currently exist. This paper will discuss the Navy's development of a High Speed Velocity Log (HSVL), which will provide self contained, two-axis velocity measurement for these advanced high speed hulls. The system selected by the Navy for an exploratory development program uses microwave doppler radar technology. The paper will discuss reasons why an FM-CW doppler radar technique was chosen over other candidate technologies. The doppler radar technique involves the transmission of narrow beam radar signals down toward the water surface. Frequency of backscattered energy from the water surface is compared with the frequency of transmission to determine the “doppler” frequency shift from which ship's velocity relative to the water surface is computed. The paper will present test results of the HSVL feasibility model aboard the hydrofoil USS High Point (PCH-1) and aboard the Amphibious Assault Landing Craft Jeff (B). In addition, a summary of an intensive analysis phase to determine HSVL critical design parameters will be described.

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THE PROCESS OF NAVAL SHIP GENERAL ARRANGEMENT DESIGN AND ANALYSIS

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NAVAL ENGINEERS JOURNAL 1981年第4期93卷 29-37页

作者： HOPE, JP A native of Northern Virginia received his BS degree in Mechanical Engineering from the University of Virginia in 1969. Upon graduation he began his career with the Department of the Navy in the acquisition of patrol craft and submarine rescue ships at NA VSHIPS. In January 1971 he transferred to the Ship Arrangements Branch of NAVSEC. He was selected for the long-term training program at George Washington University in 1974 and completed the program in February 1976 with the degree of Master of Engineering Administration. While at NAVSEC Mr. Hope has been General Arrangement Task Leader on the AO 177 DDG 47 CSGN CSGN (VSTOL) CGN 9 (AEGIS) CGN 42 and assisted in the land- mark NA VSEA Civilian Professional Community Study. In 1978 he was selected as acting head of the Damage Control Section. From that position he was selected as acting head of the Surface Ship Hydrodynamic Section. In February 1980 he was promoted to head of the Surface Combatant Arrangements Design Section. In addition to numerous outstanding performance awards Mr. Hope was nominated for the Commander Naval Ship Engineering Center Professional Development A ward in both 1978 and 1979. In 1979 Mr. Hope was presented the National Capital Award for Professional Achievement (under age 36) by the District of Columbia Council of Engineering and Architectural Societies. Mr. Hope has presented numerous professional papers at ASNE and ASE Technical Symposia. Three of these papers have been published in the ASNE Naval Engineers Journal and his papers Management of Research and Engineering: Selected Topics won the JOHN C. NIEDERMAIR Award for the best paper presented at the 13th ASE Symposium. His memberships in professional societies include ASNE ASE SNAME ASME and U.S. Naval Institute. He has served as an elected officer in ASE since 1978.

This paper describes naval ship general arrangement design and analysis, a system engineering process that seeks the optimization of the ship as a total system. Through this system engineering process, the ship is geometrically defined by allocating scarce resources of area/volume and functional location. The general arrangement design team synthesizes a design from subsystem requirements, system constraints, and policy-maker influences through iteration and negotiation into the optimum general arrangement. The use of volumetric and area ratios and indices in this process are highlighted. The paper concludes with a discussion of a new methodology now under development for analyzing and comparing general arrangement alternatives. This new general arrangement evaluation methodology links operational performance objectives to ship design philosophy and subsystem effectiveness.

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THE ENERGY CRISIS AND NAVAL SHIP RESEARCH AND DEVELOPMENT

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Naval Engineers Journal 1974年第3期86卷

作者： CDR. J. RICHARD GAUTHEY USN JOSEPH P. DeTOLLA CDR. J. RICHARD GAUTHEY USN & JOSEPH P. DeTOLLA Cdr. J. Richard Gauthey USN graduated from Cornell University in 1955 with a Bachelor of Mechanical Engineering degree and entered the U.S. Navy through the NROTC program. Following three tours of sea duty he attended the University of California at Berkeley where he earned his Master of Science degree. From 1963 to 1965 he was Project Officer for Aircraft Carriers and Amphibious Ships in the Design Division BUSHIPS. The succeeding three years he was Assistant Repair Superintendent for Surface Ships at the Pearl Harbor Naval Shipyard. After attending the Naval War College he was Maintenance Officer COMINELANT Staff prior to his present assignment as Director Ship Research and Technology Division NAVSHIPS where he has been since 1971. He is a member of both ASNE and SNAME. Joseph P. DeTolla a native of Philadelphia Pa. received his BS degree in Mechanical Engineering from Drexel University in 1969. He began his career with the U.S. Navy in 1965 as a Mechanical Engineering Trainee in the Philidelphia Naval Shipyard Design Division under the BUSHIPS Cooperative Education Training Program. In 1911 he joined NAVSEC as a Mechanical Engineer in the Fluid Systems Branch. For the past two years he has primarily been involved in conducting alternative auxiliary heating system “tradeoff” studies and in the design of total energy/waste heat recovery systems for the PF 109 Class Sea Control Ship DG/AEGIS and AO 177 Class. He is a registered Professional Engineer in the District of Columbia a member of ASE ASME and SNAME and a candidate for the Master of Engineering Administration degree at The George Washington University.

Energy used by U.S. Navy ships is viewed in the context of the national situation. Shipboard usage and the controlling variables are summarized. Research and development being planned by the Navy is described. Efforts relate to conservation of energy as well as consideration of new fuels including hydrogen and liquid hydro-carbon fuels derived from coal, oil shale, and tar sands. A brief account is given of work sponsored by the Department of Interior to produce hydrocarbon fuels, and initial Navy efforts to characterize and evaluate one such fuel is reported. This fuel has been burned at sea in the USS Johnston (DD 821). Development of conservation measures encompasses the utilization of waste heat from gas turbine and diesel engine exhausts and diesel water jackets; more efficient machinery; and reduction of energy requirements. Specific developments discussed include a design methodology to optimize waste heat utilization and higher efficiency gas turbine systems.

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THE MAINTENANCE engineering ANALYSIS, A VITAL LINK BETWEEN THE DESIGN ENGINEER AND FLEET SUPPORT

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Naval Engineers Journal 1974年第1期86卷 84-94页

作者： MARCUCILLI, T.J. HENDRICKSON, M.L. Mr. Theodore J. Marcucilli received his Bachelor's degree in Mechanical Engineering from New York University in 1954. He joined the then Bureau of Ships in the Internal Combustion Engines Branch later to be merged with the Gas Turbine Branch. He progressed through positions of increasing responsibility in the areas of RDT&E Acoustics Shock and Vibration and by June 1962 was in charge of the Machinery Division's efforts in support of Project SEAHAWK an advanced design ASW destroyer. In September 1963 he was designated as Project Manager for the Pressure Fired Boiler Program for seventeen DE's (1040 C1 DEG-1 C1 and AGDE-1). This assignment was the first known application of the Project Management concept in the Bureau of Ships. In June 1966 he was placed in charge of the Plans Policies and Procedures Branch in the Naval Ship Engineering Center and was responsible for the formulation and implementation of Acquisition Management policy and procedures. The following November he was appointed Branch Head for Propulsion Electrical and Auxiliaries Systems in the LHA Project (PMS 377) and has remained with the project from the pre-concept formulation phase through the current building period in the development and production phase. Mr. Marshall L. Hendrickson received his Bachelor's degree in Commerce from the University of Maryland and is presently enrolled in a Master's program in Government Procurement and Contract Administration at George Washington University. He has been involved in Navy Project Management Administration since January of 1963. Prior to that he had extensive Fleet experience as a Field Serivce Engineer for the Philco Corporation. Navy projects he has been associated with include the SPARROW and SIDE-WINDER Missiles the F-4 (Phantom) Series aircraft the Navy Maintenance and Material Management (3-M) System the LHA-1 Class Amphibious Assault Ship and the Ship and Air Systems Integration (SASI) Project. Presently he is the Division Director for Integrated Logistic Support on the SASI Pro

This paper discusses the Maintenance engineering Analyses (MEA) as performed in support of a major ship acquisition process. A major impetus is to demonstrate how the MEA can be utilized better to provide a direct data link between the design agent and the logistic support community to enhance Fleet operational effectiveness. A description of the overall MEA process is provided and several examples are used showing the type of design improvements realizable through an integration of the MEA process into the early stages of ship system design. © 1974 American Society of Naval Engineers

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COST-ANALYSIS OF OPTIONAL METHODS OF SHIPBOARD DOMESTIC WASTE-DISPOSAL

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NAVAL ENGINEERS JOURNAL 1973年第1期85卷 86-92页

作者： PIERSALL, CH BORGSTRO.RE USN CDR Charles H. Piersall Jr.USN graduated from the New York State Maritime College in 1956 with the Bachelor of Marine Engineer's Degree. He was designated Engineering Duty Officer (1400) in June 1958 and has had numerous engineering and industrial tours of duty. He has a Master's Degree in Mechanical Engineering from the Naval Postgraduate School (1965) and a Master's Degree in Business Administration (Systems Analysis) from the Defense Systems Analysis Program University of Rochester (1970). Upon completion of the latter he was ordered to The Center for Naval Analyses where he served as a cost analyst and shipbuilding/ship repair consultant. Additionally he was Project Officer for the Navy and the Environment Study. His present assignment is Director of Production Test and Integrated Logistic Support—LHA Project Naval Ship Systems Command. He is President of the CNA Sigma Xi Club and is active in the American Society of Naval Engineers. He has published articles in theASME Journal for PowertheJournal of the American Water Works Associationand theNaval Engineers Journal. Mr. Robert E. Borgstrom was graduated from the California State University at Northridge with a B.A. (1969) and an M.A. (1970) in Geography. He was Manager of Programming Services at the Laboratory for the Quantitative Analysis of Environmental and Spatial Systems and is presently with the Office of the Chief of Naval Operations assigned to the Center for Naval Analyses where his work has included studies of the Navy's program for environmental protection.

The problem of sewage and waste disposal from U. S. Navy ships is recognized by the highest authorities in the Navy. Many activities and individuals are deeply involved in the total problem and its numerous subcategories. The problem of costs of disposal is one of these. This paper discusses four optional methods for the disposal of shipboard domestic wastes. The annualized investment and operating costs associated with the implementation of each of the options are presented. The model considers non-nuclear, sea-going surface ships with a manning level greater than 50 men. Estimates were developed on a per ship per class basis and aggregated for the total surface fleet. This approach permits the inevstigation of different combinations of the options by merely specifying the number and type of ships to be considered in any option. Changes in military effectiveness, which is at least an equally important problem as costing, were not addressed.

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THE PATROL FRIGATE program‐A NEW APPROACH TO SHIP DIGIGN AND ACQUISTION

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Naval Engineers Journal 1973年第4期85卷 82-91页

作者： NEWCOMB, JOHN W. DITRAPANI, ANTHONY R. Mr. John W. Newcomb received his undergraduate education at Webb Institute of Naval Architecture graduating in 1966 and is currently completing requirements for a Master of Business Administration degree at the George Washington University. After gradwlting from Webb he was employed by Texaco Inc. Marine Department and later served three years active duty in the Navy as the DEG-7 Project Oficer at Supervisor of Shipbuilding Conversion and Repair Third Naval District. Subsequent thereto he was employed by the Naval Ship Research and Development Center prior to assuming his present position in the Ship System Design Division of the Naval Ship Engineering Center. He is a member of ASNE and SNAME. Mr. Anthony R. Di'hapani received his BS degree in Mechanical Engineering from the University of Wisconsin in 1958 and subsequently completed course requirements for a Master of Engineering Science while an evening student at the George Washington University. He began his engineering career in 1958 in the BuShips Steam Turbine and Gear Branch specializing in steam turbine systems for nuclear submarines. In 1962 after completing a Navy-sponsored Electronics Training Program he joined the SQS-26 Sonar Project and served as Head of the Special Projects Section and subsequently the Test and Analysis Section until selected in 1967 to head the ASW Branch for the newly-churtered DXIDXG Project now the DO963 Ship Acquisition Project in the Naval Ship System Command. In 1970 he was designated a8 Acting Director of the DD963 Technical Management Plans Division and when the PF Program emerged in 1971 was reassigned as Deputy Project Manager for the Patrol Frigate Project.

Late in 1970, Admiral E. R. Zumwdt, Chid of Naval Operations, directed that study begin towards development of a new class of ocean escort to be known BS Patrol Frigate (PF) to take over some of the duties of the Navy's World War II destroyers as these 25 year old ships are retired from the active Fleet. At the same time, the Department of Defense, was significantly revising its basic policies for the development and acquisition of major weapons systems, and PF became the Nay's first major ship claw acquisition under these new policies. This new requirement, as atmound in DOD Directive 5000.1, along with the program constraints imposed by the CNO, required the development of a philosophy and approach towards design, test and evaluation and acquisition which was significantly Merent from ship procurements of the recent past. This paper disc the overall acquisition proms for the Patrol Frigate Class BS it is being developed and implemented to meet these needs and constraints, and provides a commepfary regarding the effectiveness of the appraach as of January 1973. © 1973 by the American Society of Naval Engineers

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STRUCTURAL ANALYSIS AND DESIGN OF A CATAMARAN CROSS‐STRUCTURE BY THE FINITE ELEMENT METHOD

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Naval Engineers Journal 1973年第1期85卷 33-42页

作者： MANSOUR, DR.A. FENTON, LCDR. PAUL H. Dr. A. Mansour an Associate Professor in the Department of Ocean Engineering at Massachusetts Institute of Technology received his Bachelor of Science degree in Mechanical Engineering from the University of Cairo in 1958 and his M.E. and Ph.D. degrees in Naval Architecture and Marine Engineering from the University of California at Berkeley in 1962 and 1966 respectively. He has had field experience and design responsibilities for about six years in the Suez Canal Authority John J. McMullen Associates Inc. and M. Rosenblatt and Son Inc. and has been with the Massachusetts Institute of Technology for the past four years. During this period he contributed several technical papers and reports in the areas of structural mechanics sea loads finite element analysis of marine structures and probabilistic structural mechanics. He has been a consultant for several companies and organizations is a member of Sigma Xi and SNAME currently serving as a member of the latter's Stress Analysis and Strength of Structural Elements Panel. USN Lieutenant Commander Paul H. Fenton USN a 1964 graduate of the U.S. Naval Academy recently completed a graduate education program at M.I.T. in the field of Naval Construction and Engineering earning two degrees: Ocean Engineer and Master of Science in Naval Architecture and Marine Engineering. He is presently assigned to the Charleston Naval Shipyard Charleston South Carolina and has had previous duty in the U.S.S. STICKELL (DD 888) and with the Naval Support Activity Saigon.

One of the problems encountered during the design of the ASR‐21 Catamaran is the determination of the effectiveness of the cross‐structure deck plating. In this paper, this problem is examined using the Finite Element Method. The behavior of a multicell box girder representing a catamaran cross‐structure is studied. Because of the relatively low length‐to‐breadth ratio of a typical catamaran cross‐structure, the deck plating effectiveness is found to be rather small. Parametric studies are performed, and curves of the effectiveness as a function of the relevant geometric and loading parameters are presented. These curves may be helpful in the early stages of new designs. © 1973 by the American Society of Naval Engineers

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