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Great Lakes Symposium on VLSI

作者： S. Srinivas A. Basu A. Paulraj L.M. Patnaik Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada Centre for Development of Advanced Computing Bangalore India Microprocessor Applications Laboratory Supercomputing Education and Research Center Department of Computer Science and Automation Indian Institute of Science Bangalore India

The authors present a parallel algorithm for logic simulation of VLSI circuits. It is implemented on a network of transputers connected in a ring topology. The approach is based on partitioning a functionality matrix representation of the circuit among the transputers and adopting a data flow technique for the solution. A significant aspect of the algorithm is that it overlaps computation with communication, thereby reducing the communication overhead. It also attempts even distribution of load in order to reduce processor idle time. The algorithm possesses the advantages of ease of implementation and ease of extension to incorporate additional parameters for simulation. Performance results of the algorithm are given.< >

关键词： Parallel algorithms Circuit simulation Computational modeling Concurrent computing Application software Logic circuits Very large scale integration Algorithm design and analysis Logic design Design automation

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STRUCTURAL-ANALYSIS METHODS FOR LIGHTWEIGHT METALLIC CORRUGATED CORE SANDWICH PANELS SUBJECTED TO BLAST LOADS

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NAVAL ENGINEERS JOURNAL 1991年第4期103卷 134-136页

作者： WIERNICKI, CJ LIEM, F WOODS, GD FURIO, A WHIDDON, WD SMITH, MA PACKARD, WT Christopher J. Wiernickiis the director of the Structures and Materials Division of Designers and Planners Inc. He has over 10 years of experience in marine structural design and advanced material product development. He received a B.S. degree in civil engineering from Vanderbilt University and M.S. degrees from both George Washington University and Massachusetts Institute of Technology. He is a registered professional engineer and is a member of ASNE SNAME and SAMPE. Franz Liemis a senior structural engineer of ASTECH. He has over 18 years of experience in structural engineering. He received M.S. degrees in civil/structural engineering from Carollo Wilhelmina University in West Germany. He is a registered professional engineer. Gregory D. Woodsis the Naval Sea Systems Command's lightweight metallic structures program manager. Until recently a naval architect in the Structural Integrity Application Division he currently works in the Amphibious Auxiliary and Support Ship Branch. He received a B.S. degree in mechanical engineering from Tennessee State University with additional graduate level course work at the NavSea Institute. Anthony J. Furiois the program manager for lightweight metallic structures in the Ship Structure Division of the David Taylor Research Center. He has over 19 years of experience in ship structure research and light weight metallic development for U.S. Navy fleet applications. He received a B.S. in civil engineering from Long Island University and a M.S. in ocean engineering from Stevens Institute of Technology.

Since the early 1980s, the U.S. Navy, in conjunction with industry, has continued to develop and test innovative lightweight structural concepts with the purpose of seeking alternative replacements for conventional plate beam metallic structures. One commercially available concept currently under investigation is lightweight metallic corrugated core sandwich panels. This paper presents both elastic and plastic design methods for lightweight metallic corrugated core sandwich panels subjected to air blast loading. The equations presented in this paper, while not a complete solution to the complicated dynamic, elastic plastic phenomena of blast wave-rigid body interaction, are offered as a set of relatively simple analytical expressions that can be used in preliminary design. Because of the closed form nature of the equations the designer has the capability to quickly identify the most important parameters effecting the response of lightweight metallic corrugated core sandwich panels to air blast loads.

关键词： Shipbuilding Materials

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HYDRODYNAMIC EFFICIENCY IMPROVEMENTS FOR UNITED-STATES NAVY SHIPS

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NAVAL ENGINEERS JOURNAL 1991年第3期103卷 74-90页

作者： MCCALLUM, D ENGLE, AH PLATZER, GP KARAFIATH, G Donald McCallumis a supervisory naval architect in the Auxiliary Amphibious and Mine Warfare Ship Hydrodynamics Branch of the Naval Sea Systems Command. He has worked in ship design in his native Scotland before coming to the United States via Canada. Mr. McCallum has a M.Sc. degree from the University of Michigan and a B.Sc. from Strathclyde University (Glasgow). He is a member of SNAME ASNE and ASE. Allen H. Engleis a naval architect with the Hull Form and Hydrodynamic Performance Division of the Naval Sea Systems Command (NavSea). He received his B.S. degree in engineering science from the State University of New York at Buffalo in 1977 and his M.S. degree in ocean engineering from the University of Hawaii in 1979. Since 1980 he has worked for NavSea where he has been assigned to the Philadelphia Naval Shipyard SupShip Seattle and the U.S. Naval Academy Hydromechanics Laboratory. Selected as NavSea's Engineer of the Year for 1989 Mr. Engle is currently the program director for the Navy's Hydrodynamic Loads Technology Development Program. Prior to his current assignment Mr. Engle was technical director of the Navy's Ship Efficiency Improvement Program and task leader for hydrodynamic design for the LHD-5 AO-177 (Jumbo) AE-36 LSD-41 and FFX ship designs. Mr. Engle is a member of both ASNE and SNAME. Gregory Platzeris currently employed with Arneson Marine Inc. As manager of applications engineering Mr. Platzer is responsible for the development of propulsion specifications for articulated surface drive units matched to high-speed partially submerged propellers. Prior to November 1990 Mr. Platzer was the head of the Surface Ship Propeller Branch at the Naval Sea Systems Command. He had worked for the Navy in the field of propulsor analysis since 1977 initially at the David Taylor Research Center. Mr. Platzer graduated in 1977 from the University of Michigan with a B.S. degree in naval architecture. Gabor Karafiathis a member of the Ship Hydromechanics Department at the David Taylor Research Center.

This paper reports on an investigation of the applicability of recent hull efficiency improvement concepts to U.S. Navy ships. Among the concepts investigated were stern flaps, Grim Wheels, alternate aftbody configurations, bulbous bows, and flow modifying ducts. Extensive model testing was conducted at the David Taylor research center (DTRC) for each concept, and care was taken to check out critical propeller cavitation and noise aspects associated with the investigation of alternate stern configurations and Grim Wheel concepts. A guiding principle in this program was to utilize the expertise available both here and abroad so that each design concept would have the greatest chance of success. As a result of these investigations, significant gains in fuel economy were obtained. Specifically, full scale trials of FFG-25 (USS Copeland), equipped with and without a stern flap, demonstrated that fuel savings of 5-9% are achieved at speeds above 12 knots. In addition, fuel savings of 9.4% for T-AGS 39 equipped with a Grim Wheel and 5.6% for the combination of a large bulbous bow and a large diameter/low RPM propeller on AE-36 have been predicted. The paper concludes with a direction for future applications to U.S. Navy, and other ships.

关键词： Warships

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development AND CERTIFICATION OF HSLA-100 STEEL FOR NAVAL SHIP CONSTRUCTION - REPLY

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NAVAL ENGINEERS JOURNAL 1990年第4期102卷 103-104页

作者： CZYRYCA, EJ LINK, RE WONG, RJ AYLOR, DA MONTEMARANO, TW GUDAS, JP Ernest J. Czyryca:is a research project leader in the Metals and Welding Division of the David Taylor Research Center. He participated in the cooperative education program at the Center with Drexel University graduating in 1965 with a B.S. degree in metallurgical engineering. He has since received a B.S. degree in civil engineering in 1969 from Johns Hopkins University and an M.S. degree in engineering mechanics in 1970 from the Pennsylvania State University. In his career at the Center he has been involved in or managed major development programs in naval structural metals alloys for machinery applications failure analyses and fatigue and fracture research. Richard E. Link:is a mechanical engineer in the Metals and Welding Division of the David Taylor Research Center. He received his B.S. and M.S. degrees in Mechanical Engineering from the University of Maryland in 1984 and 1985 respectively. His work at the Center includes participation in structural and machinery alloy development programs and research in elastic-plastic fracture mechanics analysis methods. He is an active member of ASTM Committee E-24 on Fracture Testing and the Society for Experimental Mechanics. Richard J. Wong:is a metallurgist in the Metals and Welding Division of David Taylor Research Center. He received his B.S. in materials science from the University of California Berkeley in 1979 and a M.S. degree in engineering science from Catholic University in 1984. His work at the Center includes advanced joining processes weld process development and weldability analysis of naval structural materials. Denise A. Aylor:is a materials engineer in the Metals and Welding Division of the David Taylor Research Center. She received her B.S. degree in materials engineering from Virginia Tech in 1980 and her M.S. degree in materials science and engineering from The Johns Hopkins University in 1984. Her work at the Center has focused on corrosion and corrosion control research of various Navy metallic alloys and of composite materials. Thomas W. M

A significant tonnage of HY-100 steel has been used in the structural designs of new ships and submarines for weight reduction, where HT and HY-80 steels had been previously used. A reduction in hull fabrication costs and higher productivity can be achieved by substitution of an HSLA steel for HY-100. The significant factor in cost savings through use of HSLA steel in fabrication is the reduction or elimination of preheat for welding. Based on the success of the HSLA-80 steel system, a program was initiated to develop and certify an HSLA-100 steel as a replacement for HY-100 in order to reduce fabrication costs. The alloy development and evaluation to support the certification of HSLA-100 steel plate and weldments for surface combatant structural and ballistic protection applications are summarized. HSLA-100 development consisted of three phases: (1) laboratory alloy development to formulate an interim specification; (2) trial steel mill plate production; and (3) plate production for the certification program. An interim specification for HSLA-100 steel plate was used as the basis for the commercial production of over 200 tons of HSLA-100 by domestic steel plate mills. The alloy design of HSLA-100 represents a significantly different metallurgy and microstructure than HSLA-80 steel, but retains the wettability of very low carbon steel. The certification program was conducted to establish the properties, welding characteristics, fabricability, and structural performance of HSLA-100 steel plate over a range of gages from 1/4 to 3 3/4 inches. The certification program included the characterization of production HSLA-100 steel plate mechanical, physical, and fracture properties; evaluation of wettability and welding process limits for structures of high restraint; studies of fatigue properties and effects of marine environments on HSLA-100; and the fabrication and evaluation of large scale structural models to validate the laboratory developed welding process parameters

关键词： Shipbuilding Materials

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ELECTROEXPULSIVE SEPARATION SYSTEM SHIPBOARD applications

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 55-66页

作者： EMBRY, GD ERSKINE, RW HASLIM, LA LOCKYER, RT MCDONOUGH, PT Gerald D. Embry:is a senior marine engineering specialist with Ingalls Shipbuilding Inc. in Pascagoula Mississippi. He earned his BS degree in mechanical engineering in 1961 at the University of Illinois. He has twenty-eight years experience in the ship design and construction field and has held several positions at Ingalls Shipbuilding ranging from engineering section manager to group manager of project engineering. He has held other responsible engineering positions at General Dynamics/Electric Boat and several consulting firms. He has been a registered professional engineer with the Commonwealth of Massachusetts since 1966 a member of ASNE since 1978 and a member of SNAME since 1968. Robert W. Erskine:is a naval architect specialist with Ingalls Shipbuilding Inc. in Pascagoula Mississippi. He earned a BSE in naval architecture and marine engineering in 1967 at the University of Michigan and an MBA in management in 1983 at the University of Southern Mississippi. He has 22 years of engineering and managerial experience in the Navy and in the commercial marine industry. Achievements during his 13 years with Ingalls include an Aegis Excellence A ward for his work on the CG-47 class cruiser program. He has also held responsible positions with ship operation and design consultant firms in New York City. He participated in the Bearing Sea trial described herein. He has been a member of ASNE since 1977 and a member of USNI since 1985. Leonard A. Haslim:is a program manager at NASA Ames Research Center Moffett Field California. He has earned advanced degrees in chemistry mathematics and engineering from UCLA UC and Stanford. He has forty-five years experience in aerospace engineering including responsible research development and engineering positions with the U.S. Navy Lockheed Missile and Space Ford Aerospace NASA and as a consultant for Arthur D. Little Company. He holds several patents including the Electro-Expulsive Separation System for which he earned NASA's 1988 Inventor of the Year Award.

THE AUTHORS 6 ABSTRACT Shipboard weather deck ice removal is a laborious, time consuming, dangerous task. The current operational scenario consists of sailors wielding hickory baseball bats. This paper describes a viable alternative, the Electro-Expulsive Separation System (EESS), originally developed by NASA. EESS technology has been designed to remove ice from aircraft surfaces. developmental testing, which led to acceptance of this new device, is discussed together with its theory of operation. The resultant aircraft applications are described. The need to adapt this aircraft technology for shipboard applications is recognized by the Navy, the Coast Guard, the State of Alaska, and the commercial shipbuilding industry. Fishing vessels risk sinking every winter due to excessive ice accumulation on their decks and superstructure. Navy and Coast Guard cold water operations have been hampered for centuries due to severe ice accumulation during inclement weather. With the encouragement and cooperation of the State of Alaska, an EESS test program was formulated and subsequently conducted aboard an Alaskan Resources vessel in the Bering Sea. This testing is described, with lessons learned. Future test programs are identified, requisite for successful adaptation of this technology to combat and commercial shipboard applications.

关键词： Ships

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HISTORY OF COAST-GUARD SURFACE EFFECT SHIP PERFORMANCE IMPROVEMENTS

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 237-250页

作者： LARIMER, G MCCOLLUM, J SCHAUB, B VANLIEW, D WHIPPLE, C Gary Larimer:received his B.S. (1974) and M.S. (1975) degrees in naval architecture and marine engineering from the University of Michigan. He has worked with the Bechtel Professional Corporation the David Taylor Naval Ship Research and Development Center and the United States Coast Guard. He is a member of SNAME ASNE ABYC and IMTI. He is the author of “Reaction Fin Applications In Marine Propulsion” which documented the use of asymmetric pre-swirl vanes to increase propulsion efficiency aboard a 41-ft Coast Guard utility boat. It was presented on 5 March 1987 at the Hampton Roads section of SNAME and was nominated for the section paper of the year award. CWO3 Joe Bobby McCollum USCG: iscurrently engineering officer of the Surface Effect Ship Division Seventh Coast Guard District Key West Florida. Prior to this assignment he was assistant engineering officer on the USCGCUte.His other duty tours included engineering assignments on theCape Currenta 95-foot patrol boat on the USCGCUnimak a 311-foot cutter CG Loran Station Upolo Point Hawaii and CG Station Sabine Pass Texas. CWO McCollum was responsible for modifying and repairing the SESs and contributed many unique problem solving ideas which resulted in much improved operation of the Coast Guard Surface Effect Ship Division. Benton H. Schaub:is a senior engineer with Maritime Dynamics Inc. He has a bachelor of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. Mr. Schaub has fifteen years of experience working as a test engineer project engineer and design engineer on advanced marine vehicle projects and is a recognized authority in the areas of hull structure seal system and machinery design for surface effect ships. He has participated in virtually every USN SES design development and test evaluation program including: XR-5 XR-10 SES-100A SES-100A1 and the SES-200. He is currently responsible for performing detailed design and analysis in support of the seal system for the Germa

During the early 1980s the United States Coast Guard took delivery of three surface effect ships (SES) from Bell Halter, Inc. These 136-ton, 30-knot plus, aluminum hulled cutters were to be used primarily for drug interdiction in the southeastern United States. By early 1985, however, the full load weight of these cutters had grown to 150 long tons, and their top speed had dropped to below 23 knots in calm water. By mid-1985, operation of all three SESs was suspended to prevent possible catastrophic failure of their main engines. At this point, the USCG joined ranks with Textron Marine Systems (then Bell Aerospace), and Detroit Diesel to analyze what had gone wrong, and to propose solutions to the problems encountered. From that beginning, the performance of the Coast Guard's SESs has steadily and dramatically improved until at present all three cutters are able to exceed their original performance specifications. This paper discusses the problems experienced with the SESs, including engine overloading, vibration, ride quality, seal wear, poor lift system performance, and metal cracking, along with the corrective actions taken to solve them. The cooperation between government and private industry, which made this dramatic turn-around in performance possible, is also explored. Lessons learned about SES technology are viewed in relation to the general experience of the Coast Guard with other types of high performance hull forms.

关键词： NAVAL VESSELS

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THE EFFECT OF STERN WEDGES ON SHIP POWERING PERFORMANCE

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NAVAL ENGINEERS JOURNAL 1987年第3期99卷 27-38页

作者： KARAFIATH, G FISHER, SC Gabor Karafiath:is a member of the Ship Performance Department at the David W. Taylor Naval Ship Research and Development Center. He has directed the design evaluation for powering on a large number of ship designs. He received a B. S. degree in naval architecture and aerospace engineering from the University of Michigan in 1971 and a M. S. degree in naval architecture from the University of Michigan in 1972. Since that time he has worked in the area of resistance and powering for surface ships high-speed craft and advanced marine vehicles. Steven C. Fisher:is a naval architect with the Ship Performance Department of the David W. Taylor Naval Ship Research and Development Center. He graduated from the University of Michigan in 1977 and 1978 with a B. S. and M. S. degree in naval architecture. During this time Mr. Fisher has been involved in various projects at DTNSRDC involving hull form improvements for resistance reduction. This work included the development of stern wedge designs bulbous bow and sonar dome designs and ship forebody redesigns. His other work has included investigations of varied subjects such as ships passing in shallow channels the validity of small model testing stack gas dispersion analysis and ship wake improvement.

The effect of stern wedges on the powering performance and annual fuel consumption of destroyer and frigate size ships is investigated. Historical model test powering data and wedge geometry characteristics which are useful for preliminary wedge design and evaluation of wedge effectiveness is presented. The final wedge design process, using a combination of model experiments and analytical computer predictions is described. This design process, applicable to a destroyer size ship, was used to design a stern wedge which minimized the traditional low speed powering penalty due to a wedge, decreased delivered power by 6 percent at maximum speed, and provided for a 2 percent decrease in annual fuel consumption.

关键词： WARSHIPS

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A NEW GENERATION OF HIGH-PERFORMANCE PLANING CRAFT

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NAVAL ENGINEERS JOURNAL 1985年第4期97卷 234-247页

作者： JONS, OP KOELBEL, J SHELDON, R Otto Jons:is vice president of engineering at Advanced Marine Enterprises Inc. He received a Diplom Ing. from the Technical University of Hannover W. Germany and an M.S. in naval architecture and marine engineering from the Massachusetts Institute of Technology in 1976. He then joined Litton Ship Systems to work on the DD-963 and LHA programs. He was principal research scientist at Hydronautics and technical director with Designers and Planners before forming in 1976 together with S. Glatz and J. Drewry Advanced Marine where he is responsible for engineering and technical matters on behalf of the corporation. Joseph Koelbel: a senior naval architect at Advanced Marine Enterprises Inc. has for many years specialized in the design of high-speed rough-water boats including a record-setting race boat passenger boats and patrol boats such as the CPIC and the PBM. He received special recognition for his contributions to and editing of the Planing Concept Volume of the Advanced Naval Vehicles Concept Evaluation Study. He is a member of ASNE SNAME (past chairman planing boats panel of the Hydrodynamics Committee) and ABYC. He is the author of a number of published papers on small-craft design. Ray Sheldon:is the head of computer applications at Advanced Marine Enterprises Inc. where he directs activities in computer-aided ship design software development and ship performance prediction. Previously at the Hydronautics Ship Model Basin he was involved in nearly all aspects of ship hydrodynamics and the development and refinement of test methodologies and equipment. Mr. Sheldon is a 1973 graduate of Webb Institute of Naval Architecture (B.S. naval architecture and marine engineering) a member of ASNE and an associate member of SNAME. He is the author of several published papers concerning ship design and experimental methods.

Key aspects of the design development of a capable yet affordable high performance craft are addressed. These aspects include the development of mission requirements, the rationale for major design decisions, performance capabilities, and system and subsystem selection. The superior performance of the design, as demonstrated by an extensive model test program, led to the decision to develop a family of advanced fast patrol boat concepts. Selected family members are also briefly introduced. The paper, furthermore, demonstrates the successful integration of many major computer-aided design (CAD) programs currently in use for U.S. Navy ship design.

关键词： NAVAL VESSELS

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A FIBER OPTIC-SYSTEM FOR DAMAGE ASSESSMENT OF FRP COMPOSITE STRUCTURES

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NAVAL ENGINEERS JOURNAL 1984年第6期96卷 52-56页

作者： CRANE, RM MACANDER, AB Roger M. Crane:isa materials engineer in the Ship Materials Engineering Department of the David W. Taylor Naval Ship Research and Development Center (DTNSRDC) Annapolis Md. He is presently involved in the development of fiber reinforced advanced composite materials for various naval applications. He received his B.S. degree in physics/engineering and his B.A. degree in mathematics: physical applications from Loyola College. He has finished his course work for his M.S. degree in materials science at the University of Delaware and is currently enrolled at the Johns Hopkins University. Mr. Crane is a member of Society of Experimental Stress Analysis and the Society of Physics Students. Aleksander B. Macander:is a materials engineer in the Ship Materials Engineering Department DTNSRDC Annapolis Md. He is presently involved in the development of fiber reinforced advanced composite materials for various naval applications. Prior to joining DTNSRDC in 1973 he was associated with the Johns-Manville Corporation Denver Colo and also with the Naval Applied Science Laboratory Brooklyn N.Y. He received his B.S. degree in mechanical engineering from Fairleigh Dickinson University and his M.S. degree in mechanical engineering (plastics) from Stevens Institute of Technology. Mr. Macander is a member of ASTM the Severn Technical Society and the International Organization for Standardization/Technical Committee 61 on Plastics.

There are a limited number of nondestructive techniques available for field inspection of large composite structures and practically none for inservice inspection. An innovative damage assessment system is proposed which uses an optical fiber mesh implanted into the body of a fiber reinforced composite structure. This mesh would become an integral part of the structure on fabrication. The selection of the mesh fibers would be predicated on their strain to failure characteristics and strain compatibility with the base composite reinforcing fibers. This optical system will be capable of locating damage, assessing severity and monitoring damage growth. A successful implementation of the total damage assessment system would involve the interaction of the optical fiber mesh with an adequately designed interrogative electronic package. This paper focuses on the former aspect of the total system. It will address some recent experimental work showing the practicality of the concept for large, complex composite structure.

关键词： FIBER OPTICS

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EXTENSION AND APPLICATION OF SHIP DESIGN OPTIMIZATION CODE (SHIPDOC)

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NAVAL ENGINEERS JOURNAL 1984年第3期96卷 177-190页

作者： RICHARDSON, WM WHITE, WN William M:. Richardsonhas been employed as a naval architect in the Surface Effect Ship Division of the David Taylor Naval Ship Research and Development Center (DTNSRDC) where he has worked since 1975 in the areas of SES structural loads estimation and optimal ship design. Upon first coming to DTNSRDC he worked in the Ship Dynamics Simulation Branch on ACV submarine and hydrofoil simulations. While at Mare Island Naval Shipyard (MINS) he was a member of the Engineering Computer Applications Branch where he was responsible for the development of algorithms and programs for the solution of naval architectural problems including ship design flooding effects and submarine overhaul scheduling. Before coming to MINS he was employed as a naval architect in the Hull Scientific Branch of the Boston Naval Shipyard's Design Division. He obtained an B.S. degree in Naval Architecture and Marine Engineering from M.I.T. and is a member of SNAME. William N:. Whiteis a senior naval architect in the Advance Vehicles Branch of the Naval Sea Systems Command where he is responsible for the design of all surface effect ships and air cushion vehicles. Previous to his current assignment he was with PMS-304 the Navy's Surface Effect Ship Project Office. There he was the manager for machinery and system integration for the 3000 ton SES acquisition program. His earliest advanced ship experience was acquired while employed by the David Taylor Naval Ship Research and Development Center starting in 1970. Here he worked on the Navy's hydrofoil and air cushion vehicle programs. Mr. White started his career as a student trainee at the Boston Naval Shipyard in 1961 and transferred to Mare Island Naval Shipyard in 1964 where he worked on the Navy's Polaris program. He graduated from the University of Michigan with a Master's Degree in Naval Architecture and is a member of the SNAME and ASNE.

An existing nonlinear ship design optimization program designated SHIPDOC has been extended and a new surface effect ship (SES) description input file is being developed under the sponsorship of the Naval Sea Systems Command's surface ship concept formulation (CONFORM) program. SHIPDOC is currently being used in support of several feasibility and preliminary level SES designs. The program has several novel features including an open-ended, user-created ship description and the potential to model all types of ships both enhanced and conventional, surfaced and submerged. This capability has been combined with a nonlinear optimization algorithm that solves for the minimum weight ship subject to user controlled constraints. This paper presents a brief overall description of SHIPDOC and its current capabilities followed by a synopsis of ship types, both surface and submerged, which have been designed with the program in order to illustrate SHIPDOC's practical design capability.

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