作者：
JOHNSON, RACARACOSTAS, NPCOMSTOCK, ENMr. 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 i...
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.
Recrystallization is an important factor in the preparation of very dense pure oxide ceramic bodies. The work described in this paper shows the effect of the original particle size on the degree of recrystallization o...
Recrystallization is an important factor in the preparation of very dense pure oxide ceramic bodies. The work described in this paper shows the effect of the original particle size on the degree of recrystallization of beryllium oxide bodies. A water elutriator for particle-size separation in the subsieve range and an oxyacetylene furnace with zirconia refractories for operation at 2000°C. are described. The microscopic examination of prepared thin sections and the X-ray diffraction back-reflection method are used to determine particle sizes and the degree of recrystallization. Shrinkage during firing is found to be approximately constant for all particle sizes originally below 10 microns and decreases in a regular manner with increasing particle size. The recrystallization factor for beryllium oxide is found to vary from 40 for 1.25-micron particles to 2.5 for 10-micron particles.
作者：
MYERS, N.FINK, B.Norbert C. Myers
B.S. Aeronautical Engineering Northrop Institute of Technology. Currently engaged in structural and materials research concerning reinforced plastics particularly the filament-winding process. Past experience includes four years with Northrop Corporation 9 years with the Zenith Plastics Division of Minnesota Mining & Manufacturing Company and two years with the H. I. Thompson Fiber Glass Company. Mr. Myers is presently manager of the Structural Development Section. Mr. Fink has served the aircraft and aerospace industry in the capacity of an engineering specialist for the past twenty-three years. He has participated extensively in programs covering the total spectrum in development of aircraft
both fixed and rotary wing ground effect machines fiber glass boats plastic rocket motor cases and currently fiber reinforced plastic structures. Mr. Fink has had long and successful associations with Vehicle Research Corp. Aerojet General Glasspar Boat Fairchild Stratos Norair and other organizations. Now he is employed as a Technical Specialist at H. I. Thompson Fiber Glass Co. He held a degree in Aeronautical Engineering from Pasadena City College and has studied at Universities of Southern California and California. He is a registered Professional Engineer of the State of California (NE 6962).
Direct measurement of threadline tension between a rotating ring traveler and the point of enrollment on the package surface is difficult because of the general inaccessibility of this portion of the threadline. Despi...
详细信息
Direct measurement of threadline tension between a rotating ring traveler and the point of enrollment on the package surface is difficult because of the general inaccessibility of this portion of the threadline. Despite this limitation, at least four methods for deducing yarn tension by measurement of winding moment have been described. A novel, but simple system for measurement of winding tension is here described in which variation in electrical load on a twisting spindle drive motor provides the means for measurement of winding moment.
作者：
WEEMS, P.V.H.BENFIELD, CHARLES W.USN (Ret.)Captain Phillip Van Horn Weems
USN Retired is the co-founder of the American Institute of Navigation a man whose name is referenced nine times in the index of “Bowditch” hardly needs an introduction in a navigation journal. Captain Weems has been a rallying point and idea innovator in marine navigation for over half a century. He is chairman of the board and technical mentor of Weems System of Navigation Inc. internationally known supplier of courses books instruments and charts at Annapolis Maryland. Captain Weems' books and inventions may be found in the chart room of nearly every English speaking country's vessels as well as those of many other nations. He has recently devoted enthusiastic attention to improving the accuracy and convenience of the navigator's tools by applying some of the advances of modern aerospace and electronics technology. Born in Montgomery County Tennessee 29 March 1889 he was graduated from the U.S. Navy Academy in 1912. His honors and awards include: Bronze Star Gold Medal Aero Club of France Royal Society of Arts Award for second setting watch Magellanic Premium from American Philosophical Society Gold Medal from British Institute of Navigation and Thurlow Award American Institute of Navigation. He holds seven patents in navigation and has written many textbooks and papers. He was on the 1920 Olympic Wrestling team as well as being a former All American Team member after his accomplishments on the Navy football team. Charles W. Benfield is a Senior Development Engineer in the Systems section of Honeywell's Aero Division Florida facility at St. Petersburg. He received his degree in Electrical Engineering at the University of Florida in 1948. A former regular navy man with six years sea duty and flying
he has been actively interested in the art of way finding for over 20 years. Presently he is actively working to apply the company's capabilities to automation of the marine navigation process but he also has been active in studies of manual space navig
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