Recent applications of laminated composites to ship structural components have highlighted both the analytical complexities involved and the need for providing the structural designer and analyst with appropriate laminate analysis methods. To this end, three types of analytical methods, traditionalloy applied to metallic ship structural components, have been extended to the analysis of laminated composites; procedures for their implementation are discussed. These methods include: (a)...
Topics: DTIC Archive, Critchfield,Milton O, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
Computer Center CDC Libraries/NSRDC (Subprograms) CLIB/N, is a reference manual which described most of the subprograms in library NSRDC on the CDC 6000/Cyber 74 computers at DTNSRDC. These scientific and utility routines are used primarily with FORTRAN (FTN, MNF, or RATFOR) programs and most are coded in FTN. CLIB/N lists the routines by functional category and alphabetically with a descriptive title. All currently available machine-readable documents detailing the use of these routines are...
Topics: DTIC Archive, Sommer,David V, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
SWATH ships are characterized by twin submarinelike lower hulls, thin struts (one or two per side) at the air/sea interface, and a wide expansive bridging structure to tie the two sides together. With most of the buoyant volume under the water surface and most of the arrangement volume considerably above it, only a small part of the ship interacts with waves on the surface. Consequently, a SWATH ship is much steadier and easier riding than a conventional monohull of equal size. Thus, SWATH...
Topics: DTIC Archive, Lamb, G Robert, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
Topics: DTIC Archive, Gabler, Ulrich, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
The effect of a deployed air cushion landing gear on the stability of a high performance aircraft was studied at the Naval Ship Research and Development Center's 8 x 10 foot subsonic wind tunnel. Air cushion designs submitted by Bell Aerospace Corporation and Boeing were fitted to a ten percent scale A-4E and air cushions designed by Goodyear (two configurations), San Diego Aircraft Engineering Incorporated (SANDAIRE), and Bell were fitted to a ten percent scale F-8C. The effects of the air...
Topics: DTIC Archive, Davidson, Jr , H D, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
In order to comply with legislation to eliminate the use of refrigerants that damage the ozone layer, it is necessary to redesign centrifugal compressors, used by the US Navy for shipboard air-conditioning systems, to use an environmentally acceptable refrigerant. This paper describes an evaluation of a 125-ton compressor designed to use HCFC-124 as the refrigerant. The objectives are not only conducting the performance evaluation, but also pinpointing the design problems for achieving a...
Topics: DTIC Archive, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD, *AIR...
The report concerns the hydrodynamic forces and moments produced by a bow thruster. Several broad problem areas are discussed and the extent of present-day knowledge indicated. These include general duct arrangement, duct shape, and impeller design. A step-by-step design procedure is outlined that permits the selection of a practical bow thruster. This procedure is described for a minimum number of operational requirements; e.g., single bow thruster, a specified turning rate when the ship is...
Topics: DTIC Archive, Beveridge, John L, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
A summary of progress in the achievement of frictional drag reduction is presented in terms of highlights, laboratory activities, and bibliographic entries from the summer of 1971 to the summer of 1972.
Topics: DTIC Archive, Granville, Paul S, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
An algorithm is presented for the active adaptive control of periodic interference. This algorithm is derived, its performance is theoretically analyzed, and the algorithm and its performance are verified by laboratory experiments. In these experiments, this control method is shown to reduce the periodic components by more than 40 dB. Keywords include: Active control, adaptive, antinoise.
Topics: DTIC Archive, Pierce,R D, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
Standard equations of motion are presented for use in submarine simulation studies being conducted for the U. S. Navy. The equations are general enough to simulate the trajectories and responses of submarines in six degrees of freedom resulting from various types of normal maneuvers as well as for extreme maneuvers such as those associated with emergency recoveries from sternplane jam and flooding casualties. Information is also presented pertaining to the hydrodynamic coefficients and other...
Topics: DTIC Archive, Gertler, Morton, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
The objective of this study is to design and implement a data base of characteristics of deep water seaports of nations within the free world. Both military and civilian ports are considered. The study includes only general, container, and roll-on/roll-off cargo; petroleum and petroleum products; ammunition; and dry and liquid bulk cargo. Data sources include both verifiably reliable documents and port personnel. The Data Management System used to implement the data base is system 2000 which...
Topics: DTIC Archive, Ash, Curtis, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
The problem of pitch stabilization of ships is considered for different vessels of varying size, with application to both commercial and military craft. The various operational benefits of pitch stabilization are described, together with the history of prior efforts applied to this problem area by use of hydrodynamic force elements (i.e., fins or other lifting surfaces), including a discussion of the limiting hydrodynamic phenomena and vessel behavior that have inhibited the use of pitch...
Topics: DTIC Archive, Baitis,A E, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
Cavitation tunnel and open-water results are presented for a series of skewed propellers that were designed by lifting-surface methods. The four model propellers had maximum projected skew at the blade tip equal to 0, 36, 72, and 108 deg. The results showed that the cavitation-free bucket becomes substantially wider with increasing skew; however, there was some crossover in the inception of back cavitation and tip vortex cavitation among the three skewed designs near design advance coefficient....
Topics: DTIC Archive, Boswell, Robert J, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
DTNSRDC has established the Technical Office Automation and Communications System (TOFACS) to utilize modern office automation technologies. A pilot broadband network was installed to study the effects of a high speed network on the productivity of TOFACS. DTNSRDC installed the MITRENET Local Area Network (LAN) with the objective of experiencing the use and management of a LAN with the intention of eventually installing a permanent, full scale LAN at DTNSRDC. MITRENET is a network product of...
Topics: DTIC Archive, Havard,Richard , II, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
Potential flow calculations were made to determine the effects of a supporting strut and the free surface on the drag on a test model of a torpedo. These calculations show that the strut and free surface had significant effects on the test measurements. These calculations also show that the XYZ Free Surface Program can provide useful results for Froude numbers up to but not much larger than 1.5. (Author)
Topics: DTIC Archive, Dawson,Charles W, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
Steel from 22 heats of low-carbon Ni-Cr-Mo steel, HY-80 (ASTM a543-65, and MIL-S-16216G (Ships)) was heat treated to study the effects on the drop weight nil ductility transition (NDT) temperature of (1) commercial variation in composition and inclusion content, (2) variation in microstructure such as prior austenitic grain size and the relative amount of isothermally produced ferrite or bainite in a tempered martensitic matrix, and (3) the observed variation in strength obtained after a...
Topics: DTIC Archive, Salive, Marcel L, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
The waves produced at the rear of a ship as it travels at the water's surface are directly related to a component of the ship resistance known as wavemaking resistance. Pien's Wavemaking Resistance Computation Program adapts Havelock's mathematical representation of this phenomenon to provide the ship designer with a relatively quick and inexpensive way of determining the wavemaking resistance of his proposed design. This computer program can also be used in determining the optimum hull form...
Topics: DTIC Archive, Chen, Ruey, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
The David W. Taylor Naval Ship Research and Development Center has undertaken the measurement of the two-dimensional hydrodynamic loading on faired cable models as the first part of a program to improve towing configuration prediction capability. The experimental approach consists of measuring the normal and tangential hydrodynamic force components on models towed in the high speed basin over a range of speeds, cable angles, and wetted lengths, using a special Cable Fairing Dynamometer. From...
Topics: DTIC Archive, Folb, R., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
Basic principles of the acoustic-emission technique used at the Center are discussed, and a review of some applications of the method are presented. Potential capabilities and drawbacks to naval applications are summarized; finally, a description of the design and construction of the present monitoring capability at the Naval Ship Research and Development Center is presented.
Topics: DTIC Archive, Vanderveldt, Hendrikus H, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
This paper presents the design process and model evaluation of a propeller for the U.S. Navy's research vessel, T-AGOS 19, with a SWATH (Small Waterplane Area Twin Hull) Configuration. The design procedure is discussed in detail including considerations of cavitation and propeller-excited vibratory forces. The design objective was to minimize the blade cavitation at various operating conditions. Model experimental results including powering and cavitation characteristics are presented which...
Topics: DTIC Archive, Kim, Ki-Han, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
This report contains the results of standardization trials conducted on USS TARAWA (LHA 1) at a heavy displacement of 39,400 tons salt water (40,030 metric tons), and a light displacement of 35,000 tons salt water (35,560 metric tons). Measurements were made to determine powering data throughout the speed range at both displacements. In addition, fuel economy trials were conducted at the heavy displacement, and preliminary data are included in this report. TARAWA obtained a speed of 24.70 knots...
Topics: DTIC Archive, Drazin, Donald H, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
A large pressure tank, fabricated of HY-100 steel, was constructed for the David W. Taylor Naval Ship Research and Development Center (DTNSRDC). During construction careful documentation was kept concerning materials, construction practices, inspection, and certification. This report publishes that information. It is prepared to help others who may need to construct items from HY-100 steel.
Topics: DTIC Archive, Becker, L A, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
A standard Navy 10-horsepower electric motor, with varnish wire and slot cells and phases insulated with an aromatic polyamide paper, was operated in a glass enclosure at sequential operating temperatures (from 73C to 334C) in order to trap possible hydrogen cyanide and/or other volatile emissions generated under normal and overheat conditions. The total emission of hydrogen cyanide (669 micrograms) on heating would produce only 0.02 parts per million hydrogen cyanide concentration if this...
Topics: DTIC Archive, Demas, Peter, Johnson, Thomas C, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT...
This report describes a mini-system of four computer programs which form the interface between two existing systems of the Naval Sea Systems Command. The mini-system provides a means of producing workload summary graphs from the shipyard overhaul schedule of the Long Range Planning System. The programs are written in FORTRAN IV and are capable of running on either the IBM 360/370 or the CDC 6000 series computers. (Author)
Topics: DTIC Archive, Lamatrice,Linda L, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
A series of confined explosive tests was carried out for 12-in.- diameter steel and aluminum plates. Each plate in turn formed one end of the closed cylindrical chamber inside which the explosives were detonated. Tests were conducted with the chamber suspended in air and in water to determine pressure histories, deformation shapes, and failure modes in the inelastic range of air- and water-backed plates as well as to determine pressure decay rates resulting from venting to the atmosphere. The...
Topics: DTIC Archive, Zilliacus, Steve, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
The report is an engineering guide to the use of the Dyer method of manual computation and to several computer programs for determining turbulence- induced vibration and radiation of finite plates in air and in water. Both simple and clamped boundary conditions are treated. The Dyer method and the computer programs are presented in a series of appendixes: Bolt Beranek and Newman manual method; Boeing program I; Electric boat program; Underwater sound laboratory program; Boeing program II -...
Topics: DTIC Archive, Leibowitz, Ralph C, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
A users guide to the BANDIT computer program for the reduction of maximum bandwidth for NASTRAN is given.
Topics: DTIC Archive, Everstine,Gordon C, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
Two 22 inch Newton Rader type full scale propellers were manufactured and tested for use during full scale trials on the 11 meter 'Sea Fox'. Open water tests were conducted and cavitating performance characteristics were obtained for these propellers over a range of cavitation numbers corresponding to full scale speeds from 9 to 45 knots. The propeller performance data and a table containing the principal propeller geometry information is presented in this report. (Author)
Topics: DTIC Archive, Peck,James G, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
The magnetocaloric refrigerator uses the adiabatic temperature response of ferromagnetic materials (rare-earth metals) in a high magnetic field. A mathematical model of a reciprocating magnetic refrigerator having an active element of a rare-earth metal predicted that a 60-K temperature span could be achieved. Based on the model's results, an experimental refrigerator was fabricated and the thermal characteristics of an active regenerator in a reciprocating apparatus were measured. The active...
Topics: DTIC Archive, Green, Geoffrey, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
The report reflects current developments in on-line information retrieval systems and suggests goals for future developments of these systems. The review and comparison of the three major on-line information retrieval systems discussed in the paper reflect current achievements in working on-line information retrieval systems. A final section is devoted to suggestions for exploiting the potential of on-line remote access information retrieval and display systems.
Topics: DTIC Archive, Wolfe, Theodore, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
An investigation is made to determine desirable sizes and longitudinal locations of foils to provide vertical plane stability for a 2000-ton Hydrofoil Small Waterplane Area Ship (HYSWAS). After determination of the foil size and locations, the motion of the ship in regular head waves is computed and the probable range of the rate of foil deflections for the control of heave and pitch motion is examined. Within the scope of this analysis, it is found that a proper selection of size and location...
Topics: DTIC Archive, Lee,Choung M, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
Several methods of casting babbitt metal to steel were evaluated for bond strength by use of tensile-type specimens. The methods investigated were the use of a tin bath, torch/tin stick, and electroplated nickel to insure proper babbitt-to-steel bond, as well as no tinning. Of the methods performed, only the tin-bath method consistently produced a bond stronger than the babbitt metal itself. The bond strengths developed in the other methods tested were erratic and always less than that obtained...
Topics: DTIC Archive, Vassilaros, Michael G., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
After a brief review of the electromechanical functioning of the piezoelectric accelerometer, factors affecting its dynamic response characteristics and therefore the validity of vibration measurement are discussed. Consideration is given to variables such as shunt resistance and capacitance, mounting methods, base bending, cable noise, ground- loop currents, and environmental effects. Approved accelerometer mounting techniques that will ensure the accuracy and repeatability of the measurement...
Topics: DTIC Archive, Miller, R W, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
The structural seaworthiness digital computer program ROSAS and users manual are presented in this report. The program was developed using FORTRAN computer language, and it simulates the hull girder structural response of a ship, including dynamic effects when it encounters head seas of the regular, irregular, discrete, standing or other wave forms. Response calculations include the ship rigid and elastic body motion, bending moment, and shear. Vibratory hull girder modes can also be...
Topics: DTIC Archive, Chuang,Sheng-Lun, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
This report analyzes the findings in 28 program audits conducted by NAVSEA auditors. These audits are part of the NAVSEA Integrated Logistics Support Assessment Program. The purpose of the report is to identify and analyze the impact of various logistic requirements on hardware programs. To do this the findings in the program audits were reviewed to identify deficiencies which were not peculiar to a program and for which positive action can be taken to decrease the likelihood of occurrences in...
Topics: DTIC Archive, Myers, F A, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
The submerged towing characteristics of the Deep Submergence Rescue Vehicle (DSRV) are examined for a variety of towpoints and ballast conditions. The results indicate that DSRV can be readily towed at speeds up to at least 15 knots from towpoints located on the forward hard ring with vehicle net buoyancies from 0-2000 pounds positive. The hydrodynamic downforce produced by the vehicle without additional appendages such as a depressor is sufficient to produce towing depths of 100-150 feet with...
Topics: DTIC Archive, Sieber, Charles W, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
In a controlled experiment on a tilt-pad thrust bearing having measured surface crown and longitudinal roughness, the frictional results were compared with results predicted by a physico-mathematical model of the bearing. The bearing operated hydrodynamically using 2190 TEP oil at ambient and 150 F bulk temperature under loads approaching 500 psi.
Topics: DTIC Archive, Daugherty,T L, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
Automated Vehicle Scheduling (AVS) is a software package designed to assist in scheduling palletized cargo delivery to warehouses in a Navy Supply Center. The package consists of two scheduling programs, AVS1 and AVS 2, which schedule regular and emergency orders, respectively, and a transaction history file update/report program, AVS 3.
Topics: DTIC Archive, Melton,R, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD,...
The design of surfaces of vehicles is a lengthy and tedious process. Advances in interactive computer graphics and mathematical representation of curves and surfaces have made interactive graphics an attractive medium for design. The Surface Modeling and Analysis (SMA) program provides a set of computer subroutines for (1) calculating descriptive information about a surface and (2) manipulating data (by providing the interface between the programmer and the data structure). These routines are...
Topics: DTIC Archive, Rosenshine, Philip M, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
The Computer Center CDC Libraries (CLIB) manual is a cross reference volume for many subprograms, programs, utilities and procedures available on the CDC cyber 170 computers at DTNSRDC. CLIB lists the routines by functional category and alphabetically, by library, with descriptive titles.
Topics: DTIC Archive, Sommer,D V, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
For the usual merchant ship at constant speed in calm water one can calculate the wave drag approximately and even the three-dimensional boundary layer up to say 90% of the ship length. But we do not know where and how the boundary layer separates and mixes with the general secondary flow behind the ship to form the near-wake flow which the propeller has to face and which the propeller itself influences. Isotachs of the nominal or even of the effective wake can tell only part of the truth....
Topics: DTIC Archive, Wieghardt,Karl, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
Two closely related algorithms are presented for extrapolating to the limit of a scalar sequence. One, the even-epsilon algorithm, is due to Wynn; it permits systematic calculation of the array of Shank's transforms or, equivalently, of the related Pade Table. The other, the even-rho algorithm, is closely related to the first and is also based on Wynn's work; however, it has different properties and has not enjoyed the same theoretical development. Singular rules and near-singular rules are...
Topics: DTIC Archive, Eddy, Robert P., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
A systematic survey of temperature variation with depth was conducted in the David W. Taylor Model Basin (TMB) and the Maneuvering and Seakeeping (MASK) facilities at the Naval Ship Research and Development Center. Water samples from the basins were periodically tested for the presence of drag- reducing substances. A significant upper thermocline and an overall temperature gradient were found in the two basins of TMB. A weak, transient gradient was found in the seakeeping basin of MASK. No...
Topics: DTIC Archive, Santelli, N, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD...
The magnetic induction is calculated for the configuration consisting of a ferromagnetic prolate spheroidal shell with internal and external infinitesimally thin prolate spheroidal current bands. The ferromagnetic body is assumed to be linear and homogeneous. The reduction of the solutions to that of a prolate spheroidal current band in free space is shown when the permeability of the ferromagnetic prolate spheroidal shell is allowed to approach that of free space and when either the current in...
Topics: DTIC Archive, Baker,F Edward, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
A theoretical method is presented for calculating the steady propulsive interaction (thrust deduction) force in contrarotating propellers. Contrarotating propellers operating at off-design loading and spacing as well as the contribution of a rudder were investigated. The importance of the separate thrust deduction of the forward and aft propellers in analyzing the behavior of a CR propeller set was shown. Numerical results are given for a MARAD high- speed containership. Some principal findings...
Topics: DTIC Archive, Beveridge, John L., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
This report contains the results of ice-breaking trials conducted on the United States Coast Guard Cutter KATMAI BAY (WTGB-101) during January-March 1979. Data include: powering, speed, and machinery measurement obtained while operating in level and brash ice in the vicinity of Sault Sainte Marie, Michigan. The various types of trial runs conducted included: (1) continuous, level ice-breaking; (2) ice-breaking in brash ice; (3) ice-breaking by ramming; (4) maneuvering in level and brash ice;...
Topics: DTIC Archive, Drazin,Donald H, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
This report describes the historical records of the office of the Director of Navy Laboratories from 1960-1980. It lists the records down to the file heading level and indexes them by chronological period, alphabetical file heading, and keyword. The report includes a brief administrative history of the office and organizational charts.
Topics: DTIC Archive, Nowicke, Carole E., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER...
The NASTRAN Linkage Editor is a general purpose linkage editor which provides a means of using available main memory to accommodate large programs which will not fit into the available main memory. As originally designed the NASTRAN Linkage Editor required RUN FORTRAN compiled input. This report describes a modified and improved version of the Linkage Editor which has been extended to accept either RUN FORTRAN compiled or FORTRAN compiled or FORTRAN EXTENDED compiled input. The NASA Structural...
Topics: DTIC Archive, Martin, Roger J, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
Three different algorithms--the power series, the asymptotic series, and the recurrence relation method--are investigated with special attention to the single (10 to the -14th power) and double precision (10 to the -29th power) of CDC 6000 Series computers. The final accuracy of each method depends partly on the magnitudes of the largest and smallest terms when floating point additions are involved. Another consideration is the number of terms required for each algorithm. Combination of all...
Topics: DTIC Archive, Kooij, T, DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP...
This report contains the results of tactical and maneuvering trials and speed versus shaft rpm trials conducted on United States Coast Guard Cutter KATMAI BAY (WTGB-101). KATMAI BAY is the lead ship of a new class of icebreaking tugboats. The trials were conducted in Whitefish Bay, Lake Superior, Michigan. Tactical data determined that the ship has a tactical diameter of approximately three ship lengths when using 30 degrees rudder. Maneuvering data indicated that the ship could stop in 40...
Topics: DTIC Archive, Hunt, Robert R., DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA...
