Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Surface Ship"”.
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Modular platform based surface ship design
Thesis (S.M. in Naval Architecture and Marine Engineering)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001.
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Structure and Persistence of Surface Ship Wakes
It has long been known that ship wakes are observable by synthetic aperture radar. However, incomplete physical understanding has prevented the development of simulation tools that can predict both the structure and persistence of wakes in the ocean environment. It is the focus of this work to …
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The simulation of surface ship micro-bubble wakes
… and evolution of the bubble population in a surface ship wake is numerically simulated is presented. The simulation is accomplished by constructing an advective-diffusive transport model for the scalar bubble field and solving this model for late times after ship passage. The bubble …
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Free space optic communication for Navy surface ship platforms
… FSO implementation on mobile platforms such as ships is still challenging. This thesis analyzes the feasibility of deploying FSO system on navy surface ships. It discusses the FSO technology and the latest studies in maritime optical communication links. In addition, the benefits and challenges …
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Hydrostatic and intact stability analysis for a surface ship
Ship's lines are designed such that they are fair. To the naval architect, fairness means that the lines exhibit a continuous second derivative. This is the definition of a spline. Before the advent of digital computers, naval architects checked every line on a lines plan for fairness by bending a …
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An acoustic bubble density measurement technique for surface ship waters
… technique to determine bubble densities in surface ship wakes. The dual frequency technique of acoustically detecting bubbles utilizes a high and low frequency sound field to insonify the target bubbles. The bubbles themselves then radiate sound at the sidebands of higher frequency. The …
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Naval Surface Ship Maintenance: An Unconventional Approach to Improve Performance
… of delays within Private Sector repair of Naval Surface Ships. The quest to create greater efficiency, effectiveness, and excellence at the workplace has been a source of discussion and debate in the Navy for decades, particularly within the complex Private Sector Surface Ship maintenance …
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Safety in U.S. Navy Navigation Applying STAMP Processes to Surface Ship Collisions
… and accidents occurring throughout the U.S. Navy surface fleet warranted the appointment of a 34-personnel review team to analyze the three ship collisions and one grounding in 2017. These accidents resulted in 17 U.S. Navy sailors' deaths and damage to the operational ships. There were 12 …
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Computationally-effective Modeling of Far-field Underwater Explosion for Early-stage Surface Ship Design
The vulnerability of a ship to the impact of underwater explosions (UNDEX) and how to incorporate this factor into early-stage ship design is an important aspect in the ship survivability study. In this dissertation, attention is focused on the cost-efficient simulation of the ship response to a …
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Using polymer electrolyte membrane fuel cells in a hybrid surface ship propulsion plant to increase fuel efficiency
An increasingly mobile US Navy surface fleet and oil price uncertainty contrast with the Navy's desire to lower the amount of money spent purchasing fuel. Operational restrictions limiting fuel use are temporary and cannot be dependably relied upon. Long term technical research toward improving …
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Multi-attribute tradespace exploration for US Navy surface ship survivability: a framework for balancing capability, survivability, and affordability
… understanding the design tradeoffs for new naval ship concept designs cannot be understated. A combination of a tightened shipbuilding budget, large high-priority procurement programs, and an emphasis on affordability will require high level tradeoffs to be made in future ship programs. …
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The nature and origin of fine-scale sea-floor relief
… contrary to the often noted inverse relationship between sea-floor roughness and spreading rate. It is postulated that the apparent smooth sea-floor relief created at fast spreading centers is due to the inability of typical surface ship profiling systems to resolve the small amplitude/ short …
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Computer simulation of a large-scale non-linear feedback control system
… control system that filters out the effects of surface ship motion on a weapon's response to commands from the ship's fire control center. The network includes a number of non-standard elements that prevent mathematical prediction of its closed-loop response; therefore, a computer model was …
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An experimental method for measuring dynamic pressures above a cavitating propeller
… the pressure probes above the chosen 5 bladed surface ship propeller in an 5 x 5 array. The array of probes, along with upstream and downstream reference probes, acquired the dynamic pressures generated by the observed intermittent cavitations. Two computer applications were written to work …
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Virtual long baseline (VLBL) autonomous underwater vehicle navigation using a single transponder
… in a manner analogous to a 'running fix' in surface ship navigation. Navigation data from bottom survey operations of an underwater vehicle called the Autonomous Benthic Explorer (ABE) were used in the simulation. The results of this simulation are presented along with a discussion of the …
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Cooling system early-stage design tool for naval applications
… NAVSEA Design Practices and Criteria Manualfor Surface Ship Freshwater Systems and other references to create a Cooling System Design Tool (CSDT). With the development of new radars and combat system equipment on warships comes the increased demand for the means to remove the heat generated by …
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Navier-Stokes simulations of steep breaking water waves with a coupled air-water interface
Wave breaking on the ocean surface significantly facilitates the transfer of mass, momentum, heat and energy across the air-sea interface. In the context of the near field flow about a surface ship, the breaking bow wave is a key element to the bubbly signature and an appreciable portion of the …
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Single Transponder Range Only Navigation Geometry (STRONG) applied to REMUS autonomous under water vehicles
… single transponder was located on a GPS equipped surface ship that was free to move instead of the more common single bottom mounted beacon. Using only a series of spread spectrum ranges logged with time stamp, REMUS standard vehicle data, and reasonable initial conditions, the position at a later …
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Architecture Flow Optimization - Refinement and Application for Naval Ship Concept Design
… Flow Optimization (AFO) tool for naval surface ship design, specifically focusing on the development of new network and matrix-based methods for AFO formulation and their application in Concept Development. The AFO tool analyzes and optimizes the flow of energy through the ship's Vital …
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