Naval Postgraduate School
Theses and Dissertations
Now showing items 1-10 of 41
Transient response analysis of the 72 Inch TAC-4 ruggedized shipboard rack subjected to an underwater explosion event
(Monterey, California. Naval Postgraduate School, 1998-06)
The finite element modeling and subsequent transient analysis of the 72 Inch TAC-4 Rugged Rack computer system (configurations 0001AA and 0003AA only), currently employed in U.S. Navy shipboard applications, has been ...
AUV fault detection using model based observer residuals
(Monterey, California. Naval Postgraduate School, 1998-06); NPS-ME-98-004
In order for the Navy's next generation Unmanned Undersea Vehicles to be more robust to software/hardware faults, on-line failure detection and resolution is needed. Typically, fault detection methods include limits and ...
Free-surface/vorticity interaction
(Monterey, California. Naval Postgraduate School, 1993-09)
The unsteady flow phenomena resulting from the interaction of wakes and vortices with the free surface are of particular importance in naval hydrodynamics. Ship and submarine wakes produce a three-dimensional complex ...
Correlation of flux composition and inclusion characteristics with submerged arc weld metal properties in HY-100 steel
(Monterey, California. Naval Postgraduate School, 1993-09)
Submerged arc weldments of HY-100 steel prepared under standard conditions with five commercially available fluxes were analyzed to discern a basis for the variation in mechanical properties associated with different flux ...
Optimization techniques for contact stress analysis.
(Monterey, California. Naval Postgraduate School, 1992-12)
The analysis of stresses induced by contact between two bodies is inherently difficult
because the size of the contact zone is unknown and constantly changing throughout
loading. To overcome these difficulties, two ...
Coupled roll and directional stability characteristics of surface ships.
(Monterey, California. Naval Postgraduate School, 1992-06)
The problem of roll, sway and yaw motions of surface ships is considered. A
mathematical model is developed which consists of the nonlinear maneuvering equations
and incorporates cross coupling between sway force, yaw ...
A correlation of welding solidification parameters to weld macrostructure
(Monterey, California. Naval Postgraduate School, 1992-06)
A 3-D finite difference model simulating single pass autogenous welds was used to predict the temperature fields in HY-80 steel arc weldments at various powers and torch velocities. From the predicted temperature field, ...
Simulation of the underwater nuclear explosion and its effects
(Monterey, California. Naval Postgraduate School, 1992-06)
This research was conducted to enhance understanding of the use of high explosives to simulate the effects of a nuclear underwater explosion. A review of the known characteristics of the nuclear, spherical conventional, ...
Microstructure and mechanical properties of HSLA-100 steel
(Monterey, California: Naval Postgraduate School, 1990-12)
Light microscopy, scanning electron microscopy, and transmission electron microscopy were employed to examine the microstructural basis for the mechanical properties of as-quenched and tempered HSLA-100 steel. Examination ...
Multiple input sliding mode control for autonomous diving and steering of underwater vehicles
(Monterey, California: Naval Postgraduate School, 1990-12)
Design and analysis of multiple input autopilots using sliding modes in order to achieve accurate horizontal and vertical plane control of an autonomous underwater vehicle over a wide variation of speeds is presented. The ...
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Mechanical Engineering (41)