Thesis (M.S., operations research)--Naval Postgraduate School, March 2008. / Title from title screen (viewed Oct. 9, 2008). Thesis Advisor(s): Pilnick, Steven E. "March 2008." "ADA479828"--DTIC URL. Includes bibliographical references (p. 93-95).

Thesis (M.S., operations research)--Naval Postgraduate School, March 2008. / Thesis Advisor(s): Pilnick, Steven E. "March 2008." Includes bibliographical references (p. 93-95).

Thesis (doctoral)--Stockholms universitet, 1992. / Abstract in English. Added t.p. with thesis statement inserted. Includes bibliographical references (p. 151-177).

Thesis: M.S., Massachusetts Institute of Technology, Department of Ocean Engineering, 1979 / Bibliography: leaves 65-66. / Wooi Tong Tan. / M.S. / M.S. Massachusetts Institute of Technology, Department of Ocean Engineering

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As the United States Navy moves toward the all-electric ship, the need for a robust, high fidelity inverter for propulsion motors becomes mandatory. Military vessels require high power converters capable of producing nearly sinusoidal outputs to prevent torque pulsations and electrical noise that can compromise the mission location. This thesis presents a hybrid pulse-width-modulated controller for a 3x3 Cascaded Multi-Level Converter (CMLC). Ancillary results include a simple technique for extracting the reference sine wave from an independent bulk converter and implementing a synchronization technique that coordinates a space vector modulation controller with the switching pattern of a bulk inverter. The algorithms were tested on CMLC hardware that resides in the Naval Postgraduate School Power Systems Laboratory, and the results were compared with a sine-triangle pulse width modulation algorithm. The controller and converter were used to power a quarter-horsepower three-phase induction motor.

This research was conducted in association with Naval Warfare Development Command (NWDC) requests to update Unmanned Vehicle Tactical Memorandum TM-3-22- 5-SW. The research identified and discussed significant USV manning considerations such as source ratings and manpower qualities to pilot, operate sensors, support USV electronics, and the manpower implications associated with various weapons systems alternatives. In addition, this research described several existing and notional USV tactics, as well as a discussion about the existing N75 and N76 primary and secondary mission areas USV operations may support. The methodology consisted of a literature review of USV test reports; USV Advanced Concept Technology Demonstration briefs; USV Concept of Operations; fleet lessons learned; the USV tactical memorandum; Naval manpower instructions, and manuals; Weapons Tactical, Field, and Training Manuals; Military Utility Assessments; search of books, magazines, and manpower theses. The research found that determining manpower qualities and standard operating procedures will remain a dynamic process until USV equipment is standardized. The research also showed USV launch and recovery is more manpower intensive than that of a standard RHIB. Gunners Mates (GM) and Aviation Ordnancemen (AO) are potential source ratings to support USV Hellfire and Javelin missile modules. The Navy should establish a GM Navy Enlisted Classification (NEC) to support Hellfire and Javelin or add these weapons to existing GM NECs. Electronics Technicians (ET), Fire Controlmen (FC), and Fire Control Technicians (FT) are potential source ratings for USV electrical/electronic support. FC and FT are potential source ratings to support the Remote Operated Small Arms Mount. This research found additional warfighting capabilities can be gained by equipping surface warfare vessels with USV's without any negative effects to primary or secondary warfare missions. Overall, USVs enhanced designed capabilities of Naval warships and directly support a capabilities based Navy.

CIVINS / The United States Navy has taken a new interest in tumblehome hulls. While the stealth characteristics of these hull forms make them attractive to the Navy, their sea keeping characteristics have proven to be problematic. Normal approximations of sea keeping characteristics using linear differential equations with constant coefficients predict a very stable platform, while observations in model tests show a ship that is prone to extreme roll transients. This thesis examines a simple method of producing a non-linear simulation of roll motion using a tumblehome hull provided by the Office of Naval Research. This research demonstrates the significant difference that a variable restoring coefficient introduces into a hull's seakeeping characteristics. / Contract number: N62271-97-G-0026 / CIVINS

This thesis documents the development of a computational method for wave induced longitudinal bending in ships. First, there will be a discussion about the importance of longitudinal bending in ship design. The paper will then outline the basic physics at work in the system. It will review the wave forcing computation as well as the response of the vessel. It will then document the progression of the program, which was constructed in Fortran 90, as it solves the linear differential equation for the vessel bending caused by an incoming wave. The entire program then appears at the end of the paper. While the current program is not complete the theory behind it is valid and the code can be augmented to include non-linear components in the future.

Scale model tests are conducted of a Surface Effect Ship in a near-shore developing sea. A beach is built and installed in a wave tank, and a wavemaker is built and installed in the same wave tank. This arrangement is used to simulate developing sea conditions and a 1:30 scale model SES is used for a series of experiments. Pitch and heave measurements are used to investigate the seakeaping response of the vessel in developing seas. The air-cushion pressure and the vessel speed are varied, and the seakeeping results are compared as functions of these two parameters. The experiment results show a distinct correlation between the air-cushion pressure and the response amplitude of both pitch and heave. The results of these experiments are compared against results of a computer model of a Surface Effect Ship (SES). / by Michael Kindel. / Thesis (M.S.C.S.)--Florida Atlantic University, 2012. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web. / Mode of access: World Wide Web. / System requirements: Adobe Reader.