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SHIP DESIGN - PERFORMANCE THROUGH INNOVATION

naval ENGINEERS JOURNAL 1981年第1期93卷 33-44页

作者： BASKERVILLE, JE WHIDDON, WD LCdr. James E. Baskerville USN: a graduate of the U.S. Naval Academy. Class of 1969. is a qualified Surface Warfare Officer and designated Engineering Duty Officer (ED). Prior to being assigned as the Aide and Flag Lieutenant to the Commander Naval Electronic Systems Command he served in the USS Ramsey (FFG-2). 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. While at MIT he participated in a one-year feasibility design study project for a 3500-Ton advanced concept mono-hull in cooperation with the Advanced Naval Vehicles Concept Evaluation Office (OP-96V) in the Office of the Chief of Naval Operations (OPNA V). While on duty at the Pearl Harbor Naval Shipyard from 1977 until 1980 he completed assignments as Ship Superintendent for the FY78 overhaul of the USS Brewton (FF-1086) and as Type Desk Officer for the FY79 overhaul of the USS Reeves (CG-24). In 1979 he was selected as a member of the Engineering Duty Community's newly formed Ship Design and Engineering Specialist s Group and served as Assistant Design Superintendent for one-year field experience prior to rotating to the Naval Sea System Command's Ship Design Directorate where he currently is assigned as a Ship design Manager in the Shp Design Management and Integration Office. LCdr. Baskerville is a registered Professional Engineer in the state of Hawaii and in addition to ASNE which he joined in 1975. is a member of SNAME. Tau Beta Pi and Sigma Xi. LCdr. W. David Whiddon USN: graduated from the University of South Alabama in 1969 at which time he received his B.S. degree in Engineering. Subsequently he attended the Officer Candidate School Newport R.I. receiving his commission in the U.S. Navy as an Engineering Duty Officer (ED) in 1970 and later his M.S. degree in Naval Architecture and Marine Engineering and his professional degree of Ocean Engineer from Massachus

Using the design of an advanced 3,500-Metric Ton Frigate as a baseline, the impacts of various innovative and/or advanced technologies are developed. Included in the discussion are advanced concepts and design innovations related to the design of gas turbines, combat system, survivability, habitability, electrical cables, hull structures, and fabrication techniques.

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USE OF COMMERCIAL SPECIFICATIONS IN THE SHIPBUILDING PROCESS

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naval ENGINEERS JOURNAL 1981年第1期93卷 77-84页

作者： LISANBY, JW HAAS, J Rear Admiral James W. Lisanby USN: graduated from the U.S. Naval Academy in 1950 at which time he received his B.S. degree and his commission as Ensign. Subseqeuntly he was ordered to Massachusetts Institute of Technology from which he received his advanced degree in Naval Engineering (Architecture) in 1956 and more recently additional training in the Harvard Business School's Management Training Program. An Engineering Duty Officer (ED) he has had wide experience in various assignments both afloat and ashore. From 1950 to 1952 he served in the USS Mississippi (AG-128) from 1952 to 1953 in the USS LST-887 and from 1959 to 1961 in the USS Antietam (CVS-36). Shore duty assignments have included Ship Superintendent at the Charleston Naval Shipyard (1956-59) Ship Material Officer Staff of Commander-in-Chief U.S. Atlantic Fleet (1961-63) Assistant for New Con struction in the Cruiser and Destroyer Branch (1963-65) at the former Naval Ship Systems Command (NA VSHIPS) Head of the Procurement and Production Branch Fast Deployment Logistic Ship Project Office (1965-68) Director of Industrial Engineering Office of the Assistant Secretary of the Navy-Installations and Logistics (1968-69) and Executive Assistant to the Commander NAVSHIPS (1969-70). He then reported as Supervisor of Shipbuilding at Pascagoula Miss. with contract administration responsibilities for both the DD 963 and LHA 1 Class ship acquisitions. Returning to Wash ington in 1973 he completed a brief tour as Assistant for Ship Design in the Office of the Chief of Naval Operations and then served as Project Manager for the LHA Class of Amphibious Assault Ships (with headquarters in Washington D.C.) from 1974 until June 1977 at which time he assumed command of the former Naval Ship Engineering Center (NA VSEC). With the merger ofNA VSEC on 1 October 1979 with its parent com mand the Naval Sea Systems Command (NAVSEA) he as sumed his present duties as Deputy Commander for Ship Design and Integration NA VSEA. Rear Admiral Lisanby has been activ

This paper describes the method used by the Navy in the acquisition of ships, with particular reference to the some 2,500 documents referenced directly in the process. For such documents, initially mostly military, a concerted effort is underway to substitute “commercial specifications” where feasible. A comparison is made between the processing of military documents and industry standards. The paper then goes into details of available Industry Documents for materials and small items, noting the general absence for large items of machinery and equipment (and a possible solution). The use of “off-the-shelf” equipment also is discussed as well as advantages and disadvantages of both methods of specifying requirements. Finally, the paper summarizes the alternatives: maximum use of industry standards (either directly or indirectly); use of Commercial Item Descriptions where feasible; and retention of military documents where necessary (mission-critical systems, where marine ruggedness is required, and for truly military applications).

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COMPARATIVE naval architecture ANALYSIS OF NATO AND SOVIET FRIGATES .2.

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naval ENGINEERS JOURNAL 1980年第6期92卷 84-93页

作者： KEHOE, JW GRAHAM, C BROWER, KS MEIER, HA USN Capt. James W. Kehoe Jr. USNreceived his U.S. Navy commission in 1952 after receiving his B.S. degree in Mathematics from Stonehill College in Massachusetts. and subsequently he attended the Sun Diego State College from which he received his M.A. degree in Education. His sea duty assignments have included three Destroyers most recently as Commanding Officer. USS John R. Pierce (DD-743).and three Aircraft Carriers. most recently as Engineer Officer in theUSS Wasp (CVS-18).Ashore he has had duty in the Navy's Nuclear Weapons Program the POLARIS Missile Program and as an Instructor in Project Management. Currently he is the Director Comparative Naval Architecture Program in the Naval Sea Systems Command. Capt. Kehoe has been a member of ASNE since 1974 and has authored two technical papers on U.S. and Soviet ship design practices which were published in theU.S. Naval Institute Proceedingsand theNaval Engineers Journal. Cdr. Clark Graham USNbetter known as “Corky.” graduated from the U.S. Naval Academy in 1964 and subsequently received his Ph. D. degree from Massachusetts Institute of Technology (MIT) in 1969. Currently. he is assigned to the Naval Sea Systems Command as the DDGX Ship Design Manager. Previous to this assignment. he was the NAVSEA Cruiser Project Manager Representative and SUPSHIP Newport News Project Officer for Nuclear Cruisers. He has served in three combatant ships including the Guided Missile CruiserUSS Gridley (CG-21)as Engineer Officer. He has had a tour of duty at the former Naval Ship Engineering Center as a Ship Design Manager and as Director U.S./Soviet Comparative Ship Design Study. During his duty in the Office of the Chief of Naval Operations (OP-96). he was the Technical Assistant for the Advanced Naval Vehicles Concept Evaluation. In addition. Cdr. Graham has taught Ship Design in the Naval Construction and Engineering Curriculum at MIT. and recently he developed a course in Comparative Naval Ship Design for the MIT Professional Summer Program. He has had over 15 Techn

This paper is a report of a comparative naval architecture analysis of United States, Canadian, French, Netherlands, German, British, and Soviet Frigates. The investigation covered general arrangements, weapons and sensors, survivability, intact and damaged stability, manning and personnel support (all of which me discussed in PART I), and hull form, propulsion, speed range, sea keeping, ship size, and future growth capability (to be published in PART II). Weapons and sensors were only addressed in terms of their impact on the weight and volume of the ship. The actual military effectiveness of each Frigate was not assessed.

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CONCEPT study OF MOBILIZATION TUG-BARGE DESIGNS

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naval ENGINEERS JOURNAL 1980年第2期92卷 23-33页

作者： WILSON, WB FOLTIS, C Mr. Warren B. Wilson received his B.S. degree in Naval Architecture and Marine Engineering from Webb Institute in 1975. and in 1976 was awarded the SNAME Wilbur N. Landers graduate scholarship for study at Massachusetts Institute of Technology subsequently receiving his M.S. degree in Naval Architecture and Marine Engineering in 1977. Following his graduation from Webb Institute he was employed by the Naval Ship Engineering Center (NAVSEC) in the Hull Division where he worked on Submarine arrangements in the Ship Arrangements Branch and was the Hydrodynamics Task Leader for the T-ARC Cableship in the Hull Form and Hydrodynamics Branch. At the present time. he is a Naval Architect at the Maritime Administration (MARAD) where he has been involved most recently in MARAD's T-AO Concept Design effort. Mr. Wilson is an Associate Member of SNAME and in 1975 was the recipient of SNAMES Undergraduate Paper Award. Mr. Constantine Foltis received his B.S. degree in Naval Architecture and Marine Engineering from the University of Michigan in 1953. He worked for short periods of time for Carl J. Nordstrom. Consulting Architect in Seattle. Wash. and for M. Rosenblatt & Son. Inc. New York City. prior to joining the Maritime Administration in 1955. Since then he has held a variety of naval architectural positions in and out of the MARAD Washington Headquarters. Currently. he is the Manager of Preliminary Design in the Division of Naval Architecture and in this capacity supervises the preparation of concept studies and preliminary designs of a wide variety of Merchant Ships and Barges of all types. both for new construction and conversion. Mr. Foltis is a registered Professional Engineer in the state of Maryland. and in addition to ASNE. which he joined in 1977 is a member of SNAME.

This paper describes one facet of a continuing effort within the Maritime Administration to insure the adequacy of the United States Merchant marine in a war or national emergency. As a result of comments on “Merchant Ships for Wartime Mobilization Prototype Design and Construction for Readiness”, given at ASNE Day 1976, a concept study was initiated within the Maritime Administration to assess the utility of integrated Tug-Barges in a mobilization program. The results of this study are given in this paper. In light of the restricted number of shipways available for building the multi-purpose mobilization ship, the need is defined for another ship type which would be suitable for construction at a larger number of facilities. General design objectives are then developed for this ancillary ship which satisfy mobilization requirements. A brief analysis of the capability of integrated Tug-Barges to meet the design objectives is conducted, followed by four Barge concept designs and a description of Tug options, which demonstrate the feasibility of utilizing Tug-Barges in a mobilization effort. The eventual goal, after the completion of a preliminary design phase, will be the development of a set of contract plans and specifications followed by the construction of a prototype vessel.

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TECHNOLOGICAL ADVANCES IN AIRCRAFT CARRIER DESIGN

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naval ENGINEERS JOURNAL 1980年第5期92卷 71-85页

作者： REIN, RJ RYAN, JC USN (RET.) Cdr. Robert J. Rein USN (Ret.)currently is the Director of Naval Support Systems for the Columbia Research Corporation Washington D. C. At the time this paper was presented he was on active duty in the U.S. Navy serving as the Ship Design Manager for the CVV Naval Sea Systems Command. Prior to that his duty assignments included Deputy Program Manager for the Sea Control Ship Assistant Ship Material Officer. Staff of Commander Naval Air Force U.S. Pacific Fleet and Type Desk Officer for Cruisers/Destroyers and New Construction (CG 30) at the former Hunter's Point Naval Shipyard. He is a graduate of General Motors Institute an accredited private college sponsored by the General Motors Corporation: the U.S. Naval Postgraduate School Monterey. Calif.: and the Defense Systems Management College. Fort Belvoir. Va. Additionally. he has had extensive postgraduate study in Systems Management at The George Washington University. Cdr. Rein is extremely active in his support of professional engineering societies and as a member of ASNE since 1964 has been responsible for the founding of ASNE Local Sections on the west coast and presently is serving as the Society's National Assistant Secretary-Treasurer. In addition he also was the creator and coordinator for the highly successful. Society sponsored Symposium “Aircraft Carriers — Present and Future.”which was held in October 1976 at the U.S. Grant Hotel. San Diego. Calif. and was the first such Symposium jointly sponsored by an Operating Fleet command and a professional society. Mr. J. Christopher Ryanreceived his B.S. degree in Naval Architecture and Marine Engineering from Webb Institute of Naval Architecture in 1967 and his M.S. degree in Naval Architecture from Massachusetts Institute of Technology in 1969. His initial work experience was at Litton Ship Systems where he was associated primarily with the general arrangements development of the DD 963 Class design. Subsequently. he was employed at the former Naval Ship Engineering Center with work as

Since the signing of the Contract Design Plane for the CVN 68 (the U.S. Navy's latest Class of Aircraft Carriers) In 1963, considerable technological advances have been made in naval Ship Design. This paper provides specific examples of how new technology has affected traditional Carrier design practices and techniques, and also indicates areas where future advanced technology will be needed. It is divided into four sections: 1) Computer Design Application; 2) Total Ship Energy Conservation Analysis; 3) Advances in Structural Design; and 4) Impact of V/STOL Aircraft. The increased use of the computer to define ship characteristics in the initial stage of ship design is discussed, followed by a report on efforts to include energy conservation as an integral part of the design process. The energy conservation approach uses traditional analytical techniques to develop innovative design configurations that will achieve energy savings. Of the many advances in Carrier structural design, two specific examples are given: 1) Elimination of the infamous “knee-knockers” (high sills in passageway openings) common to Gallery Deck structure, and 2) Successful attempts at reducing the thickness of aircraft elevator platforms. The paper concludes by pointing out some possible challenges facing the ship designer and some of the technology already created by the expected introduction of advanced design Vertical/Short Takeoff and Landing (V/STOL) aircraft.

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COMPUTER AIDS FOR SHIP DESIGN, INTEGRATION AND CONTROL

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naval ENGINEERS JOURNAL 1980年第2期92卷 73-87页

作者： CARLSON, CM JOHNSON, RA HELMING, FW Mr. Craig M. Carlson received his B.S. degree in Naval Architecture and Marine Engineering from the University of Michigan in 1970 and began his career with the Department of the Navy at the Naval Ship Engineering Center (NAVSEC). In 1972. he returned to the University of Michigan under the NAVSEC Long Term Training Program and received his M.S. degree in Naval Architecture and Marine Engineering. After returning to the Ship Arrangements Branch at NAVSEC. he was assigned as Task Leader for General Arrangements for the PGG PCG PHM. and MCM ship designs and was awarded Outstanding Performance Awards in 1974 and 1975. In addition he was Manager of the Arrangement Subsystem of the Navy's Computer-Aided Ship Design and Construction Program (CASDAC). In October 1979. he became Manager of the CASDAC Hull Design System. Currently. he also is enrolled in the M.S. of Computer Science Program at Johns Hopkins University. Mr. Carlson previously has presented technical papers at ASNE Day 1974 and 1978 as well as at the 1979 DOD Manufacturing Technology Advisory Group Conference. Besides ASNE. which he joined in 1972. he is a member of SNAME. ASE. and the U.S. Naval Institute. Mr. Robert A. Johnson is a Naval Architect in Surface Combatants Design (SEA 03D3). Ship Design Integration Directorate Naval Sea Systems Command. He received an Associate in Engineering degree in Drafting and Design Technology in 1959. his B.S. degree in Aerospace Engineering in 1965. and his M.S. degree in Engineering Mechanics in 1970. all from the Pennsylvania State University. In 1973. he was selected for the NA VSEC Hull Division s Long Term Training Program at the University of Michigan subsequently receiving his M.S.E. degree in Naval Architecture in 1974. Mr. Johnson began his career with the Ordnance Research Laboratory at Pennsylvania State University in 1959 where he worked. on the design of hydroelastic submarine models and conducted research in the area of flow induced structural vibrations. In 1967 he joined HRB-Singer at State Colle

This paper presents an integrated approach to Computer-Aided Ship Design for U.S. Navy preliminary and contract design. An integrated Hull Design System (HDS), currently under development by the Hull Group of the naval Sea Systems Command (NAVSEA 32). is the vehicle for the discussion. This paper is directed toward practicing ship design professionals and the managers of the ship design process. Primary emphasis of this paper, and of the development effort currently under way, is on aiding ship design professionals in their work. Focus is on integration and management control of the extremely complex set of processes which make up naval ship design. The terminology of the Ship Designer and Design Manager is used. The reader needs no familiarity with the technologies of computer science.

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INTEGRATING THE NAVYS 21ST-CENTURY MISSION REQUIREMENTS INTO TECHNOLOGICALLY ADVANCED, YET AFFORDABLE, DESTROYER DESIGNS

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naval ENGINEERS JOURNAL 1980年第5期92卷 25-36页

作者： BASKERVILLE, JE WHIDDON, WD USN LCdr. James E. Baskerville USNa graduate of the U.S. Naval Academy Class of 1969 is a qualified Surface Warfare Officer and Engineering Duty Officer (ED). Prior to being assigned as Aide and Flag Lieutenant to the Commander Naval Electronic Systems Command he served in theUSS Ramsey (FFG-2).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. While at MIT. he participated in a one-year feasibility design study project for a 3500-ton advanced concepts monohull in cooperation with the Advanced Naval Vehicles Concept Evaluation Office (OP-96V) Office of the Chief of Naval Operations (OPNAV). While on duty at the Pearl Harbor Naval Shipyard he completed assignments as Ship Superintendent for the FY78 overhaul of theUSS Brewton (FF-1086)and as Type Desk Officer for theUSS Reeves (CG-24)FY79 overhaul after which he was selected in 1979 as a member of the Engineering Duty Community's newly formed Ship Design and Engineering Specialists Group serving as Assistant Design Superintendent for one-year field engineering experience prior to rotating to his present duties in the Ship Design Directorate. Naval Sea Systems Command in July 1980. In addition to ASNE which he joined in 1975. he is a member of SNAME Tau Beta Pi and Sigma Xi. LCdr. W. David Whiddon USNgraduated from the University of South Alabama in 1969 at which time he received his B.S. degree in Engineering. Subsequently. he attended the Officer Candidate School Newport. R.I. receiving his commission in the U.S. Navy as an Engineering Duty Officer (ED) in 1970 and later in 1977 his M.S. degree in Naval Architecture and Marine Engineering and his professional degree of Ocean Engineer from Massachusetts Institute of Technology (MIT). Currently. he is assigned to the Ship Design Management and Integration Office. Naval Sea Systems Command previously having had tours of duty i

This paper defines the current state of balance of naval power between the United States and Russia, highlighting the shift in favor of the Soviet Navy. The various alternative weapons systems which could be employed to balance the growing Soviet threat are examined and the conventional surface combatant ship is found to be the most cost effective solution. System level technological improvements are discussed and various goals are identified to enable an increase in capabilities to fulfill future mission requirements without a drastic increase in acquisition cost.

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A SUBmarine CONTROL-SYSTEM TEST VEHICLE

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naval ENGINEERS JOURNAL 1980年第2期92卷 148-155页

作者： SEJD, JJ WATKINSON, KW HILL, WF Mr. James J. Sejd received his B.S. degree in Civil Engineering from Case Western Reserve University and has since undergone considerable graduate study at both The George Washington and American Universities. He served almost four years in the U.S. Navy as a Naval Aviator and enjoys the unique distinction of being qualified in both Heavier- and Lighter-than-Air aircraft. Early in his career he was employed at the Navy's Bureau of Ships in the capacity of a Structural Designer and Structural Research Monitor. In 1966 he joined the Staff of the Center for Naval Analyses where he was involved in the mathematical modeling of ships and aircraft and in economic “trade-off‘ analysis. In 1970. he went to the Naval Ship Engineering Center as an Operations Research Analyst in the Ship Design and Development Division. At the present time he is employed as a Program Manager for the Naval Sea Systems Command Ship Design Research and Development Office. A member of ASNE since 1973 he also is a member of the Association of Scientists and Engineers at NAVSEA the Operations Research Society of America and the Lighter-Than-Air Society. Mr. Kenneth W. Watkinson received both is B.S. and M.S. degrees in Engineering Science from Florida State University in 1970 and 1971 respectively. Since graduation he has been employed at the Naval Coastal Systems Center (NCSC). Panama City. Fla. where he is primarily involved in the investigation of the stability and control of underwater vehicles. For the past four years he has been the Task Leader and Principal Investigator for the NCSC portion of the Advanced Submarine Control Program involved in developing control design methods and the instrumentation system for the Submarine Control System Test Vehicle. Mr. William F. Hill is currently the ASCOP Program Manager at Lockheed Missiles & Space Company (LMSC) Inc. where he has the overall responsibility for design and construction of the Control System Test Vehicle (CSTV). He entered the aircraft industry in England as an Apprentice w

As part of the Advanced Submarine Control program (ASCOP), the naval Sea Systems Command has developed an open water Submarine Control System Test Vehicle (CSTV). This vehicle is a 1/12 scale model of an SSN 688 Class Submarine, with provisions for easy geometric changes. Such changes include alternate Sail size and location, the addition of parallel middle-bodies, alternative tail sections, and alternative control configurations. A self-contained instrumentation and control system provides the capability for “on-board” recording of all relevant Submarine-state variables, over the entire speed and depth range, to a degree of data accuracy exceeding any known system. With the means thus available to correlate measured vehicle hydrodynamics with selected maneuvers, conditions, and changes in hull geometry and control surface configuration, modern mathematical techniques for improving submarine equations of motion can be employed to permit dramatic design enhancements in both safety and performance. This paper provides the rationale and history of the development of this vehicle, a description of the instrumentation and control package, and a description of the vehicle itself.

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A NOTE ON ANTI-SHIP MISSILES AND FUTURE SHIP DESIGN

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naval ENGINEERS JOURNAL 1980年第4期92卷 84-86页

作者： RUHE, WJ USN (RET.) THE AUTHOR: is a graduate of the U.S. Naval Academy Class of 1939 who served in Submarines during World War II and much of his naval career. Later he commanded Destroyers and Missile-Armed Destroyer Units his major command being the TERRIER-Armed Guided Missile Cruiser USS Topeka. Much of his shore duty career involved conceptual planning for new Navy systems as well as operational research involving sea wars of the future and he directed the study effort for the ocean wars in the first General Purpose Forces Studies conducted by the Joint Chiefs of Staff. On retirement in 1967 he joined the Staff of the President's Commission on Ocean Engineering and Research and upon completing his Commission work joined General Dynamics' Corporate Director of Marine Program Development presently serving in General Dynamics' Washington Office as Manager of Warfare Analysis and Energy Programs. His numerous articles in national magazines stress the great changes which he feels we must be aware of if we are to meet the challenge which the missile-dependent Soviet Navy now poses.

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SHIP SYSTEM SEAKEEPING EVALUATION - STOCHASTIC APPROACH

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naval ENGINEERS JOURNAL 1979年第6期91卷 33-46页

作者： JOHNSON, RA CARACOSTAS, NP COMSTOCK, EN Mr. Robert A. Johnson is currently a Naval Architect in the Hull Group (SEA 32) Ship Design and Integration Directorate Naval Sea Systems Command. He received his Associate in Engineering degree in Drafting and Design Technology in 1959 his B.S. degree in Aerospace Engineering in 1965 and his M.S. degree in Engineering Mechanics in 1970 all from Pennsylvania State University. In 1973 he was selected for the Navy's Long-Term Training Program at the University of Michigan from which he received his M.S.E. degree in Naval Architecture in 1974. Mr. Johnson began his professional career at the Ordnance Research Laboratory Pennsylvania State University in 1959 where he was involved in the design of hydroelastic submarine models and conducted research in the area of flow-induced structural vibrations. Subsequently he joined HRB-Singer at State College Pennsylvania in 1967 as a Research Engineer and in 1969 joined the former Naval Ship Engineering Center (NAVSEC) where he was employed in the Submarine Structures Branch Surface Ship Structures Branch and the Performance and Stability Branch of the Hull Division. Currently he is the CASDAC Hull System Technical Director and also Head of the Surface Ship Hydrodynamics Section (SEA 32133) Naval Architecture Division Naval Sea Systems Command a member of ASE SNAME and Tau Beta Pi and one of the Navy Subcommittee Members of the Ship Structures Committee. Mr. Nicholas P. Casacostas is currently a Section Chief for Naval Architecture in the Washington D.C. office of M. Rosenblatt & Son Inc. His professional career has been in both Navy and commercially related fields and he has had published several technical papers dealing with the subjects of Ship Propulsion and Hydrodynamics as well as Shipping Economics and Operations. A member of ASNE since 1977 he also is a member of the Royal Institute of Naval Architects and SNAME and presently serving on the latter's H-2 (Resistance and Propulsion) Panel. Mr. Edward N. Comstock is currently a Seakeeping Speciali

The recent trend in naval Forces has been a shrinking Fleet in both numbers and ship size. This dictates that our ships must have greater operational effectiveness if the Navy is to continue to carry out its mission in the future as it has done in the past. The seakeeping performance of a ship is a major determinant of its overall operational effectiveness. The methodology presented in this paper is a comprehensive approach to the evaluation of a ship's seakeeping performance. The scope of this methodology encompasses the assessment of ship mission scenarios and the relative importance of associated mission requirements as well as the probabilistic description of the uncertainties imposed by the variable ocean environment. The methodology is presented in a general sense so that the seakeeping performance of a ship's configuration can be evaluated as a function of mission scenario, mission area, sea state, ship heading, and speed. In order to utilize the full potential of the methodology, more refined scenario descriptions and more accurate environment specifications must be obtained. A simplified example is presented in which a comparison of the operational effectiveness of two small hull forms is made, using information now available to the designer. It is anticipated that the methodology presented can be used not only as a powerful tool in the decision-making process of practical ship design, but also as the basis for parametric studies of mission strategies.

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