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.
Results
Showing 1 to 20 of 38 for “"UUVs"”.
-
Modifiable Stability and Maneuverability of High Speed Unmanned Underwater Vehicles (UUVs) Through Bioinspired Control Fins
Underwater Vehicles generally have control fins located only near their aft end, for making controllable changes in directions. This design allows for stability of control; but, the turns are typically large in comparison to the vehicle’s body length. Some bony fish, such as tuna, however, have …
-
Modifiable stability and maneuverability of high speed unmanned underwater vehicles (UUVs) through bioinspired control fins
Underwater Vehicles generally have control fins located only near their aft end, for making controllable changes in directions. This design allows for stability of control; however, the turns are typically large in comparison to the vehicle body length. Some bony fish, such as tuna, on the other …
-
Disruptive innovation and naval power : strategic and financial implications of unmanned underwater vehicles (UUVs) and long-term underwater power sources
… challenges. Unmanned underwater vehicles (UUVs) are emerging as the Navy's seaborne equivalent of the Air Force's drones. Representing a low-end disruptive technology relative to traditional shipborne operations, UUVs are becoming capable of taking on increasingly complex roles, tipping the …
-
UNDERSEA LOGISTICS: ROUTING OPTIMIZATION IN GRAY ZONE ENVIRONMENTS
Unmanned undersea vehicles (UUVs) are being built to meet the growing demand for undersea operational awareness and payload delivery, but there are no tools for operational planners to handle logistics regarding UUVs, such as routing logistic vessels to UUVs of differing capabilities, unique …
-
Demonstration of passive acoustic detection and tracking of unmanned underwater vehicles
… vehicle (UUV) technology has transformed UUVs from tools for intelligence, surveillance, and reconnaissance and mine countermeasures to autonomous platforms that can perform complex tasks like tracking submarines, jamming, and smart mining. Today, they play a major role in asymmetric …
-
Demonstration of passive acoustic detection and tracking of unmanned underwater vehicles
… vehicle (UUV) technology has transformed UUVs from tools for intelligence, surveillance, and reconnaissance and mine countermeasures to autonomous platforms that can perform complex tasks like tracking submarines, jamming, and smart mining. Today, they play a major role in asymmetric …
-
Development of a snorkel for unmanned underwater vehicles
… of the ocean. However, one limitation has kept UUVs from truly becoming mass produced, its limited range. The problem with traditional snorkel designs built for submarines is that they are far too large to be effective on a small underwater vehicle. This paper thus explores the design and …
-
Development and validation of a conceptual design program for unmanned underwater vehicles
… on high-endurance unmanned underwater vehicles (UUVs) to support successful operations in a challenging threat environment. Undoubtedly, this naval strategy will necessitate versatile UUV systems that fulfill a broad spectrum of customer-generated requirements. This thesis presents a unique …
-
Hydrodynamic Interactions of an Unmanned Underwater Vehicle Operating in Close Proximity to a Moving Submarine
… fields and wakes. The launch and recovery of UUVs from submarines is very challenging because these hydrodynamic interactions make UUVs hard to control near submarines and my even cause collisions between the two vehicles. The mapping of these forces and moments is vital to simulate the motion …
-
A Hydrodynamic Analysis and Conceptual Design Study for an External Storage Enclosure System for Unmanned Underwater Vehicles.
… majority of commercially available medium-sized UUVs are incapable of mission operations with durations longer than 30 hours, many unable to achieve 24 hours. The complex integration of control and instrumentation equipment internal to the UUV has a detrimental impact on the location, type and …
-
Fault-Tolerant Control of Unmanned Underwater Vehicles
Unmanned Underwater Vehicles (UUVs) are widely used in commercial, scientific, and military missions for various purposes. What makes this technology challenging is the increasing mission duration and unknown environment. It is necessary to embed fault-tolerant control paradigms into UUVs to …
-
Decision algorithms for Unmanned Underwater Vehicles during offensive operations
… of a system of Unmanned Underwater Vehicles (UUVs) operating in littoral areas in an offensive capacity. A series of complementary algorithms were designed to collect information about an enemy vessell, and subsequently use this information to both select and move to a prefered intercept …
-
Development of a porous piezoresistive material and its applications to underwater pressure sensors and tactile sensors
… fail to navigate unmanned undersea vehicles (UUVs) in dark, unsteady and cluttered environments. Other advantages of MEMS pressure sensor arrays include lower power consumption and that their passive nature makes them covert. The goal of this work focuses on the development of a flexible …
-
Evaluation and Characterization Testing of Liquid Fuel Cell Chemistry for Applications in Unmanned Underwater Vehicles
… as an especially beneficial energy source for UUVs. Literature examples exist which demonstrate LFC viability, although there is presently little to be found regarding applications to UUVs. Additionally, LFCs often make use of Gas Diffusion Layers (GDLs), despite the lack of gaseous species …
-
Advances in passive acoustic detection, localization, and tracking applied to unmanned underwater vehicles
… tracking (DCLT) of unmanned underwater vehicles (UUVs) in the presence of shipping traffic is a critical task for passive acoustic harbor security systems. In general, vessels can be tracked by their unique acoustic signature due to machinery vibration and cavitation noise. However, cavitation …
-
Advances in Passive Acoustic Detection, Localization, and Tracking Applied to Unmanned Underwater Vehicles
… tracking (DCLT) of unmanned underwater vehicles (UUVs) in the presence of shipping traffic is a critical task for passive acoustic harbor security systems. In general, vessels can be tracked by their unique acoustic signature due to machinery vibration and cavitation noise. However, cavitation …
-
Anomaly detection methods for unmanned underwater vehicle performance data
… data for unmanned underwater vehicles(UUVs). UUVs collect a tremendous amount of data, which operators are required to analyze between missions to determine if vehicle systems are functioning properly. Operators are typically under heavy time constraints when performing this data …
-
An Underwater Vehicle Navigation System Using Acoustic and Inertial Sensors
<p>Unmanned Underwater Vehicles (UUVs) have become an essential tool for different underwater tasks. Compared with other unmanned systems, the navigation and localization for UUVs are particularly challenging due to the unavailability of Global Positioning System (GPS) signals underwater and the …
-
Integrating a RESON 7131 forward looking sonar into the REMUS 2500 underwater autonomous vehicle
… in the media, Unmanned Underwater Vehicles (UUVs) are playing an increasingly important role in both private and military operations. This thesis follows the process of integrating an advanced forward looking sonar (FLS) onto an existing UUV to increase object detection, avoidance, and …
-
Use of an asymmetric propeller for unmanned underwater vehicles
… improvement in propulsive efficiency. For UUVs meant to operate for long periods without recharging, any increase in propeller efficiency can result in more time on station. The second object was to allow for an alternate method of steering the UUV. By controlling the speed of the propeller …
Page 1 of 2