Theses and Dissertations
Effects of positional information time lags on motion stability of autonomous vehicles.
(Monterey, California. Naval Postgraduate School, 1992-09)
Highly maneuverable ocean going vehicles require quick response, control, and
guidance to maintain accurate track keeping characteristics. Ocean vehicles, however, may
experience significant lags in their inertial ...
Plastic sheer buckling of ship hull plating induced by grounding
(Monterey California. Naval Postgraduate School, 1992-06)
A study was conducted to develop an analytical model for predicting the horizontal resistance due to in-plane shear of ship's hull bottom plating that is undergoing deformation induced by grounding. First, four models were ...
An experimental study of the response of small tunnel thrusters to triangular and square wave inputs
(Monterey, California. Naval Postgraduate School, 1992-12)
The response of small tunnel thrusters to triangular and square wave changes in applied voltages to the thruster motor is studied. Previous mathematical models have attempted to identify the dynamic characteristics in ...
Effect of surface coating on cylinders subjected to underwater shock
(Monterey, California. Naval Postgraduate School, 1992-09)
The response of a composite cylinder (metallic cylinder coated with a rubber material) subjected to an underwater explosion was analyzed numerically. Qualitative differences between coated and uncoated cylinders were ...
Neural network based propulsion system fault diagnostics for the NPS AUV II
(Monterey, California. Naval Postgraduate School, 1992-06)
The use of artificial neural networks to provide a method of detecting and isolating impending failures in an autonomous underwater vehivle propulsion system has been studied. Two types of fault diagnostic systems, each ...
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 ...
The influence of a lower heated tube on nucleate pool boiling from a horizontal tube
(Monterey, California. Naval Postgraduate School, 1992-06)
Nucleate pool boiling is an essential part of the vast cooling systems today's combatant ship combat systems are dependent upon. Understanding the mechanisms that influence heat transfer in tube bundles in a liquid pool ...
Filmwise condensation of steam on horizontal wire-wrapped smooth and roped titanium tubes
(Monterey, California. Naval Postgraduate School, 1992-09)
Filmwise condensation heat-transfer measurements were performed on horizontal smooth and roped titanium tubes using steam. The roped tubes were a commercially available tube (KORODENSE) with a normal pitch of 7 mm. To ...
Nucleate boiling heat transfer study of direct immersion cooling of a 3x3 array of vertically orientated electronic components in a dielectric fluid
(Monterey, California. Naval Postgraduate School, 1992-09)
Direct application of two-phase heat transfer in the liquid cooling of electronic components in fluorinated hydrocarbons (FC-72), is severely inhibited by the excessive amount of superheat required to initiate nucleate ...
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