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 ...
Sensitivity analysis of transient and steady state characteristics of surface ship progressive flooding
(Monterey, California. Naval Postgraduate School, 1999-09)
The Navy's primary analysis of damage control and stability to date has been under static conditions. Dynamic effects, such as progressive flooding, and the dynamic damage control procedures, such as hole patching and ...
A methodology for design of passive isolation for ship/barge connection
(Monterey, California. Naval Postgraduate School, 1999-09-01)
Current ramp designs used in RORO operations have been determined to be structurally inadequate in Sea-State 3. The main reason for this is that when the ramp is loaded with two vehicles, the relative motions between the ...
Improved computer modeling of ship progressive flooding as a design tool
(Monterey, California. Naval Postgraduate School, 1998-09-01)
When a ship suffers underwater damage, there is a rapid influx of water, followed by a period of slower progressive flooding. This results in flooding of compartments whose hull boundaries, but not interior bulkheads, are ...
Bias effects on motion stability of submersible vehicles
(Monterey, California. Naval Postgraduate School, 1998-09)
This thesis analyzes the nonlinear characteristics of motion stability of a submersible vehicle in combined sway, yaw, and roll motions. Previous results, at zero pitch angles, indicate that limit cycles are generated as ...
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 ...
Design, simulation, and experimental verification of a computer model and enhanced position estimator for the NPS AUV II
(Monterey, California. Naval Postgraduate School, 1991-12)
A full six-degree-of-freedom computer model of the Naval Postgraduate School Autonomous Underwater Vehicle (NPS AUV II) is developed. Hydrodynamic Coefficients are determined by geometric similarity with an existing swimmer ...
An initial assessment of free surface effects on submerged bodies
(Monterey, California. Naval Postgraduate School, 1994-09)
This thesis presents a study of free surface effects on submerged bodies. The motivation for this study lies in the significance of free surface suction effects during submarine operations at periscope depth. Such operations ...
Autopilot design for autonomous underwater vehicles based on sliding mode control
(Monterey, California: Naval Postgraduate School, 1990-06)
An autopilot is designed using Sliding Mode Control Theory that can control the speed and heading of a full six degree of freedom, nonlinear model that allows speed and heading to be treated as separate systems. Once control ...
Dynamic stability of positively buoyant submersibles : vertical plane solutions.
(Monterey, California. Naval Postgraduate School, 1991-12)
This thesis analyzes the dynamic stability of positively buoyant submersibles. Six
degree -of- freedom equations of motion are used to compute steady state behavior with
motion restricted to the vertical plane. Steady ...
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Papoulias, Fotis A. (31)
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Mechanical Engineering (31)