Global ETD Search
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Showing 1 to 20 of 37 for “"naval vessels"”.
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Modelling the induced magnetic signature of naval vessels
In the construction of naval vessels stealth is an important design feature. With recent advances in electromagnetic sensor technology the war time threat to shipping posed by electromagnetically triggered mines is becoming more significant and consequently the need to understand, predict and …
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Evaluation and optimization of axial air gap propulsion motors for naval vessels
Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Active and Passive Flow Control over the Flight Deck of Small Naval Vessels
Helicopter operations in the vicinity of small naval surface vessels often require excessive pilot workload. Because of the unsteady flow field and large mean velocity gradients, the envelope for flight operations is limited. This experimental investigation uses a 1:144 scale model of the U.S. Navy …
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Design and analysis of shipboard electrical distribution
… of shipboard electrical distribution system for Naval vessels. The design combines three traditionally separate disciplines: damage control, marine engineering, and electric power engineering to produce a hybrid system well suited for present and future surface warship environments. The design …
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USS John F. Kennedy Memorial Center
Aircraft Carriers are naval vessels that allow for landing and take-off of military aircraft. Typically, Aircraft Carriers are active for 50 to 60 years then need to be retired or decommissioned. The ship is either torn apart for resources, sunk to the bottom of the ocean to serve as an artificial …
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Effect of hull-to-bulkhead flexible connection on blast resistance of double hulled ships
… industry though it is largely unexploited within naval vessels. The Impact and Crashworthiness Lab at MIT has proposed the use of adaptive sandwich structures to improve the blast resistance of naval hulls. This project will address two main areas of investigation through the use of simplified …
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Fracture of aluminum naval structures
Structural catastrophic failure of naval vessels due to extreme loads such as underwater or air explosion, high velocity impact (torpedoes), or hydrodynamic loads (high speed vessels) is primarily caused by fracture. Traditionally, naval structures have been designed to resist yielding, buckling …
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Simulation and performance of a high frequency cycloconverter
With modern naval vessels headed in the direction of integrated power systems, new attention must be paid to efficiency of both power and space. However, modern designs for ship power systems often incorporate DC link converters, or synchroconverters, into their design. Not only does this add extra …
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Implementation of a Multi-Criteria Decision Analysis (MCDA) Toolkit to Aid in Ranking Naval Mission Vessel Combinations With Uncertainty
… the placement of military bases (specifically naval bases), there exists tactical, environmental, cultural, climate, logistical, and geographical issues that need to be fully considered before deciding on a naval installation location and the vessels to be stationed there. I will present a new …
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IMPROVING CYBER RESILIENCE OF SHIPBOARD POWER SYSTEMS USING MACHINE LEARNING
Naval vessels are increasingly implementing their own shipboard microgrids to reduce fuel consumption and to meet growing technological requirements. This improved technology comes with benefits but also creates unique risks, including exposure to cyber intrusions. To prevent exploitation of these …
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Maintenance practices for emergency diesel generator engines onboard United States Navy Los Angeles class nuclear submarines
… the need for decay heat removal common to all (naval and commercial) nuclear reactors, naval vessels with nuclear reactors also require a backup means of propulsion. All underway Navy nuclear reactors are operated with diesel generators as a backup power system, able to provide emergency …
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Diagnostic indicators for shipboard systems using non-intrusive load monitoring
… condition of electro-mechanical systems on board naval vessels. Results from data collected from engineering systems on board USCGC SENECA (WMEC-906), a 270-foot U.S. Coast Guard cutter, indicate that the NILM can effectively identify faults, failures and deviations from normal operating …
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Shipboard fluid system diagnostics using non-intrusive load monitoring
Systems on modern naval vessels are becoming exclusively dependent on electrical power. One example of this is the replacement of distilling and evaporator plants with reverse osmosis units. As the system is in continuous operation, it is critical to have remote real-time monitoring and diagnostic …
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Shipboard fluid system diagnostics using non-intrusive load monitoring
Systems on modem naval vessels are becoming exclusively dependent on electrical power. One example of this is the replacement of distilling and evaporator plants with reverse osmosis units. As the system is in continuous operation, it is critical to have remote real-time monitoring and diagnostic …
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From Gunboats to Good Neighbors: U.S. Naval Diplomacy in Peru, 1919-1942
This dissertation examines the role naval power played in the evolution of U.S. policy toward Latin America during the interwar period, when the United States abandoned armed interventionism in favor of the policy of the "Good Neighbor." Specifically, it focuses on two oft-overlooked types of naval …
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Creep and Elevated Temperature Mechanical Properties of 5083 and 6061 Aluminum
With the increasing use of aluminum in naval vessels and the ever-present danger of fires, it is important to have a good understanding of the behavior of aluminum at elevated temperatures. The aluminum samples 5083-H116 and 6061-T651 were examined under a variety of loading conditions and …
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Remote nondestructive evaluation of composite-steel interface by acoustic laser vibrometry
… or damaged portions of civil structures. On naval vessels, FRP materials are incorporated to reduce weight, particularly up high, and to reduce radar cross section, thereby increasing stealth capability. In both cases of FRP use, it is usually in conjunction with some other material, …
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Slip clutch design for position sensitive systems in marine environments
The Naval Research Laboratory (NRL) requested a two-axis pan tilt mechanism be designed, built, and tested for shipboard deployment of a sensor payload. Of paramount consideration to this design was the robustness of the system in the face of wave impact loading from "green water" taken over the …
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Ship design with the human factor: evacuation and normal operations modelling in the ship design process
… passenger ship evacuation analysis and naval vessel normal operations and evacuation analysis. In the first instance, this thesis investigates the impact of the current regulatory specified passenger response time distributions upon evacuation analysis and then recommends a more …
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