Decomposition theory is concerned with the structures that arise in the decomposition of systems. It states from the premise that any method of system decomposition is based, either explicitly or implicitly, on some c...
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Decomposition theory is concerned with the structures that arise in the decomposition of systems. It states from the premise that any method of system decomposition is based, either explicitly or implicitly, on some concept of dependence. The formal setting of decomposition theory is the dependence, an ordered-triple ( E , M , D ), where E is a nonempty set, M is a collection of subsets of E , and D is a relation from nonempty subsets of M to subsets of M . If ( A , B )∈ D , it is said that ` A depends on B '. Duality is considered here. In particular, given a dependence ( E , M , D ), its dual is a dependence ( E , M , D '). Duality plays a role here similar to duality in other formal systems such as graphs, matroids, lattices, circuits, control systems, and so forth. It deepens our understanding of dependence by pairing seemingly different concepts.
The potential use of rudders as anti-roll devices has long been recognized. However, the possible interference of this secondary function of the rudder with its primary role as the steering mechanism has prevented, fo...
The potential use of rudders as anti-roll devices has long been recognized. However, the possible interference of this secondary function of the rudder with its primary role as the steering mechanism has prevented, for many years, the development of practical rudder roll stabilizers. The practical feasibility of rudder roll stabilization has, however, in recent years been demonstrated by two systems designed and developed for operational evaluation aboard two different U.S. C oast G uard Cutters, i.e., Jarvis and Mellon of the 3,000-ton, 378-foot HAMILTON Class. The authors describe the major components of the rudder roll stabilization (RRS) system, along with the design goals and methodology as applied to these first two prototypes. In addition, a brief history of the hardware development is provided in order to show some of the lessons learned. The near flawless performance of the prototypes over the past four years of operational use in the North Pacific is documented. Results from various sea trials and reports of the ship operators are cited and discussed. The paper concludes with a discussion of the costs and benefits of roll stabilization achieved using both a modern anti-roll fin system, as well as two different performance level RRS systems. The benefits of roll stabilization are demonstrated by the relative expansion in the operational envelopes of the USS OLIVER HAZARD PERRY (FFG-7) Class. The varying levels of roll stabilization suggest that the merits of fins and RRS systems are strongly dependent on mission requirements and the environment. The demonstrated performance of the reliable RRS system offers the naval ship acquisition manager a good economical stabilization system.
作者:
Richardson, James C.Berman, Paul I.Capt. James C. Richardson
Jr. a surface warfare officer was graduated from the U.S. Naval Academy U.S. Naval Postgraduate School and the American University. With proven subspecialities in Material Management and Computer Systems Technology he has served as Commanding Officer USS Hepburn (FF-IOSS) Program Manager of the Mk 86 Gun Fire Control System at the Naval Sea Systems Command and is currently Commanding Officer of the Navy Regional Data Automation Center Washington D. C. Paul Berman is manager of Product Support Engineering for Lockheed Electronics Company
Plain field New Jersey. His department is responsible for logistics planning and analysk supply support field engineering training and technical documentation in support of the division as products. His 30 years of experience in product support include preparation of logistics plans engineering data technical publications and training materials. He is also an adjunct instructor at Rutgers University. Mr. Berman received a BA from Queens College in 1951 and an MA from Hunter College in 1957. He attended the U.S. Army Signal Corps radar school and was a field radio and radar repairman during the Korean War. He is currently a member of the Society of Logistics Engineers and the National Management Association.
The structural design of a ship's section is a complicated, repetitive and time consuming task. With the advent of new technology, high speed computers have enabled the ship designer to accomplish in a matter of s...
The structural design of a ship's section is a complicated, repetitive and time consuming task. With the advent of new technology, high speed computers have enabled the ship designer to accomplish in a matter of seconds what would formerly take days to accomplish by hand. The Structural Synthesis Design program (SSDP) is a N avy developed computer-aided design tool which is used to design (or to analyze) the longitudinal scantlings for a variety of ship cross sections, consisting of any practical combinations of decks, platforms, bulkheads and materials, i.e., various steel and aluminum alloys. The final hull section design will have the lowest practical weight for the chosen geometric configuration, structural arrangements, and imposed loadings. The scantling developed by the program will satisfy all U.S. N avy ship structural design criteria. An explanation of the objective and design elements of N avy ship structures is included. The rationale behind the SSDP design philosophy is developed along with the significant program capabilities. In an attempt to highlight the influence of automated design procedures on the current naval ship design process, the effect of the SSDP on the DDG 51 destroyer structural development is addressed.
作者:
FLUK, HThe authorgraduated from New York University in 1952 as an Aeronautical Engineer and entered the United States Air Force (USAF). He attended the USAF Institute of Technology for graduate Aerodynamics
and following that served three years as a Project Officer in the field of Special Weapons. Returning to civilian life in 1957 he joined Curtiss-Wright Corporation's Engine Division and shortly thereafter transferred to the company's Model 200 V/STOL Aircraft Program later to become the Tri-Service X-19. His responsibilities variously included Flight Loads and Controls Aerodynamic Research and publication of the X-19 Aircraft Technology. In 1966 he joined Boeing's VERTOL Division initially working in helicopter stability and then in downwash and autorotation characteristics. This was followed by research and development and long-range planning and then assignment to introduce new computer services to the Engineering Department. In 1975 he joined the Naval Air Engineering Center Lakehurst N.J. to provide technology in horizontal and vertical engine jet flows and at the present time is Manager for Systems Studies in the Advanced Systems Office where he works with the Aircraft and Ship Communities to enhance military effectiveness at sea.
A weapons system has been configured specifically to counter (or preempt) the long-range standoff missile threat. Rationale for this system starts with a discussion of cost and weight, and shows why modern multi-missi...
A weapons system has been configured specifically to counter (or preempt) the long-range standoff missile threat. Rationale for this system starts with a discussion of cost and weight, and shows why modern multi-mission systems have become intolerably expensive. Questions are raised regarding the advantages and disadvantages of building future naval aviation forces solely around the Aircraft Carrier Battle Group. The application of a few small modern ships, forming a future Battle Force, holds promise for large economies. Likewise, some accepted views regarding CTOL (Conventional Take Off & Laundry) and V/STOL (Vertical Short Take Off & Launding) aircraft are revisted in terms of their relative costs. A weapons system is proposed which, at one-fourth the weight of an Aircraft Carrier Battle Group, may be produced and operated for one-third the cost.
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 Nava...
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.
作者:
COLEMAN, EWHEFFNER, WHMr. Ernest W. Coleman is a Project Engineer in the Microwave Technology Branch
Radar Division Sensors & Avionics Technology Directorate. of the Naval Air Development Center (NADC). Warminster. Pa. He began his professional career at NADC in 1971 after receiving his B.S. degree in Electrical Engineering from the Tennessee Technological University. He has held several engineering positions in the areas of Design. Development. Simulation and Test & Evaluation of both antenna systems and avionics systems. He did his graduate study in Electromagnetics at Ohio State University and has authored several technical papers and numerous reports. Currently. he is Project Engineer for the development of an Adaptive Array Antenna to be used with future communication systems such as JTIDS. Mr. W. Herbert Heffner
Jr. is Head of the Microwave Technology Branch at NADC Wurminster. Pa. He received his B.S. degree in Electrical Engineering from Drexel University in 1962. and since then has held several design and development engineering positions at NADC and in the Naval Material Command. He attended Ohio State University during 1964 and 1965 receiving his M.S. degree in Electrical Engineering upon completion of his studies. For the past fourteen years he has been involved in the analysis. design development. and evaluation of aircraft antenna systems. radonies. and radar cross-section reduction techniques. In 1976. he was temporarily assigned as Program Element Administrator Surface and Aerospace Target Surveillance. under the Deputy Chief of Naval Material for Development. Naval Material Command. In his four years since returning to NADC. his responsibilities have included developing antennas for future Electronic Warfare and Communication Electronic Counter-Countermeasure applications as well as digital computer antenna analysis techniques and radar camouflage of tactical aircraft.
The Navy is developing an airborne adaptive array antenna for the Joint Tactical Information Distribution System (JTIDS). JTIDS is a Tri-Service multi-channel, multi-function system to provide an advanced communicatio...
The Navy is developing an airborne adaptive array antenna for the Joint Tactical Information Distribution System (JTIDS). JTIDS is a Tri-Service multi-channel, multi-function system to provide an advanced communication, navigation, and identification (CNI) capability for a wide variety of uses. JTIDS terminals perform multiple digital voice/data functions and relative navigation as well as the standard TACAN and IFF transponder functions. The system uses a low-duty cycle, spread-spectrum waveform and advanced coding techniques to provide secure, jam-resistant, and low probability of exploitation CNI functions. Among the important factors which determine the ultimate utility of a JTIDS terminal is the performance of the antenna system. Inadequate antenna performance could seriously degrade and possibly even negate the primary platform mission. Recent advances in antenna and data processing techndogiea promise to provide JTIDS with adequate gain and pattern coverage as well as substantial AJ (Anti-Jam) margin to complement JTIDS signal processing. The desired improvement in AJ protection can be achieved by capitalizing on the spatial filtering properties of adaptive array antennas. This paper presents the “trade-offs” which must be addressed in the design of an adaptive array antenna for airborne JTIDS terminals and the design philosophy currently in development by the Navy.
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 provid...
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.
A description will be given of a process consisting of two connected vertical stand-pipes. This physical process is rather simple in the details of its construction, but the relationship between the flows into and out...
A description will be given of a process consisting of two connected vertical stand-pipes. This physical process is rather simple in the details of its construction, but the relationship between the flows into and out of the standpipes and the levels is nonlinear and complicated. A nonlinear mathematical model will be derived to describe the dynamical behaviour of this system. A control structure with nonlinear multi loop feedforward and linear single loop feedback control will be analyzed and discussed. Simulation and implementation with an experimental laboratory set-up are used to illustrate and demonstrate the behaviour of process with the proposed control structure.
作者:
CHILDERS, RADM.K.C.GLOECKLER, FREDERICK M.STEVENS, ROBERT M.USN (RET.)RAdm. K.C. Childers
USN (Ret.):graduated from the U.S. Naval Academy in 1939. and later completed his graduate studies at California Institute of Technology from which he received his MS and AE degrees. He was a fighter pilot in the aircraft carriers USS Ranger and USS Essex during World War II and an instructor at the Guided Missile School. Ft. Bliss Texas from 1947 until 1949 at which time he came to Washington. D.C. as an Assistant Division Director Ships Installation Division Bureau of Aeronautics. In addition his active duty career included assignments as Naval Air Systems Command Representative Atlantic Assistant Commander for Material Acquisition
Naval Air Systems Command and Deputy Project Manager for the FlllB/Phoenix Program. Bureau of Naval Weapons. During the first five years of the Polaris Program
he was responsible for all testing at the Atlantic Missile Range. He also served as Commander of the Naval Missile Center where he directed the test and evaluation of Airborne Weapon Systems and had been on an earlier assignment the Missile Test Officer. His military decorations include the Silver Star the Legion of Merit two Air Medals the Navy Commendation Medal and a Presidential Unit Citation. Currently he is employed as the Manager of the Analysis and Evaluation Department at CERBERONICS. Inc. Falls Church. Va. Mr. Frederick M. Gloeckler:
currently a Consultant to CERBERONICS Inc. graduated from New York University from which he received his BS degree. He began his career with the Department of the Navy in 1938. and culminated it with his retirement in 1972 at which time he was engaged in VSTOL aircraft analysis and was the Director Advanced Systems Division Naval Air Systems Command (and its predecessor organizations). During this period he made major contributions to the Fleet Ballistic Missile Program the F-14
A-7 and S-3 Aircraft Programs and the Phoenix
Condor and Harpoon Missile Programs. In 1951 Mr. Gloeckler organized‘ and directed the Systems Engineering Divis
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