Thesis (S.M. in Naval Architecture and Marine Engineering; and, S.M. in Ocean Systems Management)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005. / Includes bibliographical references (p. 109-113). / Under the fiscal reality of the 21st century military budget, the typically manpower intensive United States Navy has had to learn to do more with less of everything, in many cases specifically less sailors. One mission area that is prime for manpower reduction is naval logistics. JMIC, the Joint Military Intermodal Container is a combined Naval Sea Systems Command/ Office of the Chief of Naval Operations (NAVSEA/OPNAV) program that is designed to change the way the United States Navy conducts logistics. Automation and efficiency improvements inherent to the JMIC program are proposed to drastically lower the manpower requirements and complexity of the US Navy logistics pipeline. JMIC is a program in the very early stages of development. This thesis will examine some of the operational and technical challenges associated with incorporating JMIC into the United States Navy, and ultimately United States Military logistics architecture. / by Mark Edward Johnson. / S.M.in Naval Architecture and Marine Engineering; and, S.M.in Ocean Systems Management

Thesis (S.M. and Nav.E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001. / Includes bibliographical references (leaves 68-70). / The purpose of this study is to develop a more efficient and robust algorithm for adjusting the blade shape as a part of a coupled lifting-surface design/analysis code for marine propulsors developed at MIT, known as PBD-14. The algorithm for adjusting the blade shape in the current version of PBD-14 works satisfactorily in most cases. However, with more complex schemes such as ducted propulsors and/or higher load distributions, the process has to be carefully monitored by the user and the blade surface can develop corrugations in the spanwise direction. A different approach investigated in this study is based on an idea of aligning the blade shape by tracing streamlines. In order to satisfy the kinematic boundary condition, the final blade shape has to exactly match the streamlines of the flow field in which the propeller blade operates. The algorithm that is developed traces streamlines by calculating the total velocity on a grid of points and then exactly fits the blade on this grid of points. Initial tests of this algorithm have demonstrated its robustness by producing accurate blade shapes both in uniform and in more complicated flow fields. Finally, propeller fabrication is investigated, and tolerance issues as well as propeller inspection methods, traditional and modem, are examined. A cost analysis is performed that investigates the economic impact of manufacturing an example propeller according to a certain tolerance system. / by Aristomenis Chrisospathis. / S.M.and Nav.E.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004. / Includes bibliographical references (leaves 150-151). / The use of wind power is in a period of rapid growth worldwide and wind energy systems have emerged as a promising technology for utilizing offshore wind resources for the large scale generation of electricity. Drawing upon the maturity of wind turbine and floater technologies developed by the wind energy and oil and gas industries, respectively, large offshore wind energy systems have been developed and are being proposed for operation in offshore areas where environmental restrictions are less restrictive, large wind resources exist, and open sea areas are available for wind farm development. A fully coupled dynamic analysis technique was developed to predict the response of a floating wind turbine system in a stochastic wind and wave environment. This technique incorporated both non- linear wave loading on the submerged floater and the aerodynamic loading on the wind turbine. A tension leg spar buoy was designed to support the wind turbine. This design was chosen due to its relatively small size and hence lower potential cost per wind turbine. The system's tethers were attached to the ends of spokes which radiated out from the spar cylinder. This arrangement of lines and spokes promised to be very stiff in the roll and pitch modes of motion. / (cont.) The fully coupled analysis technique was used to evaluate the feasibility of the chosen floater design. Damping properties of the combined floater / wind turbine system were determined by conducting simulated free decay tests for the different modes of motion and wind turbine operating conditions. Numerical simulations for operational conditions were also carried out. The response of the floating wind turbine to three different sets of environmental conditions was determined and compared to a fixed base system. Additional simulations were conducted to determine extreme wind and wave event response. Stiffness of the floating system in roll and pitch was found to be a desirable attribute. The results of the analysis demonstrated that the tension leg spar buoy has the potential to support a wind turbine in an offshore environment without adversely affecting the loading on the system components. / by Jon E. Withee. / Ph.D.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005. / Includes bibliographical references (leaf 59). / Many comparative naval architecture analyses of surface ships have been performed, but few published comparative analyses of submarines exist. Of the several design concept papers, reports and studies that have been written on submarines, no exclusively diesel submarine comparative naval architecture analyses have been published. One possible reason for few submarine studies may be the lack of complete and accurate information regarding the naval architecture of foreign diesel submarines. However, with some fundamental submarine design principles, drawings of inboard profiles and plan views, and key assumptions to develop empirical equations, a process can be developed by which to estimate the submarine naval architectural characteristics. comparative naval architecture analysis creates an opportunity to identify new technologies, review the architectural characteristics best suited for submarine missions and to possibly build more effective submarines. An accurate observation is that submarines designed for different missions possess different capabilities. But are these unique capabilities due to differences in submarine naval architecture? Can mission, cost, or other factors affect the architecture? / (cont.) This study examines and compares the naval architecture of selected diesel submarines from data found in open literature. The goal is to determine weight group estimates and analyze whether these estimates provide a relevant comparison of diesel submarine naval architecture. / by Kai Oscar Torkelson. / S.M.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2005. / Includes bibliographical references (leaves 78-80). / This thesis looks at the hydrodynamics of spherical projectiles impacting the free surface using a unique experimental WebLab facility. Experiments were performed to determine the force impact coefficients of spheres and then compare obtained results to theories developed by Von-Karman [ 19] and Wagner [20]. It was found that experimental results matched a generalized Wagner approach developed by Touvia Miloh [12]. A critical impact speed for splash formation was determined before which no splash cavity would form. The cone angle formed behind an impacting object was also studied. The cone angle was found to be a function of depth and impact speed over the range of impact velocities tested. Steel spheres ranging in diameter from 0.64 cm (1/4 in) to 5.08 cm (2 in) were used at impact speeds from 0 to 6.9 m/s. Standard billiard balls of diameter 5.72 cm (2.25 in) were also used in this study. As part of this project, the WebLab facility was constructed. iMarine WebLab is an interactive teaching tool used to educate students in various aspects of marine hydrodynamics and experimental fluid mechanics. / by Stephen Michael Laverty, Jr. / S.M.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997. / Includes bibliographical references (p. 343-353). / by Arthie Todd Morrison, III. / Ph.D.

Massachusetts Institute of Technology. Dept. of Ocean Engineering. Thesis. 1972. Ocean E. / MICROFICHE COPY ALSO AVAILABLE IN BARKER ENGINEERING LIBRARY. / Includes bibliographical references. / Ocean E.

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001. / Includes bibliographical references. / by Matthew V. Barlin. / S.M.

Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995. / Includes bibliographical references (leaves 182-184). / by Chen-Yang Fei. / Ph.D.

Thesis (Ocean E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1986. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 75-76. / by Sean Joseph Stackley. / Ocean E.