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 31 for “"Potential fields."”.
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Spacecraft formation flight exploiting potential fields
The potential benefits that can be reaped from a distributed satellite system have led to the proposal of several multi-spacecraft missions by both NASA and DoD. One such benefit is the reconfigurability of these multi-spacecraft systems. This ultimately led to additional requirements being levied …
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Potential fields from cardiac strands of cylindrical geometry
… also studied as an interesting special case. A Potential theory model is developed for the strand, that is based on a solution of Laplace's equation in the media of interest, subject to appropriate boundary conditions. The solution for potential at an arbitrary point in the extracellular medium …
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Genetic Algorithms Optimized Potential Fields For Decentralized Group Tasking
… real-world applications. In this thesis, we use potential fields based on task and agent properties to control the movement of groups of agents and use a genetic algorithm (GA) to optimize potential field parameter values to lead to complex task achieving behaviors. More specifically, we control …
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Comparing Potential Fields and Velocity Obstacles for Rules of the Road Compliant Ship Driving
… one that uses genetic algorithm trained potential fields, and one that determines a new trajectory from velocity obstacles and the closest point of approach. Prior work has used a variety of methods for ship driving, including genetic algorithms and velocity obstacles. However, the usage …
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Motion planning for multi-link robots with artificial potential fields and modified simulated annealing
… a hybrid control methodology using Artificial Potential Fields (APF) integrated with a modified Simulated Annealing (SA) optimization algorithm for motion planning of a multi-link robots team. The principle of this work is based on the locomotion of a snake where subsequent links follow the …
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Modeling and Estimation of Bat Flight for Learning Robotic Joint Geometry from Potential Fields
… biology has gained renewed attention due to the potential improvements in efficiency, maneuverability, and adaptability with which animals interact with their environments. Motion studies of biological systems such as humans, fish, insects, birds and bats are often used as a basis for robotic …
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A Climatological Analysis of Upper-Tropospheric Velocity Potential Fields using Global Weather Reanalysis, 1958-2020
Upper-tropospheric (200 hPa) velocity potential is useful in identifying areas of rising or sinking atmospheric motions on varying temporal scales (e.g., weekly, seasonal, interannual) especially in the global tropics. These areas are associated with enhancement (rising motion) or suppression …
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Interpretation of Potential Fields by Modern Data Processing and 3-dimensional gravity Modeling of the Dead Sea Pull-Apart Basin / Jordan Rift Valley (JRV)
… aeromagnetic data of Jordan and Middle East. The potential field data delineate the location of the major faults, basins, swells, anticlines, synclines and domes in Jordan. The surface geology of Jordan and the immediate area east of the Rift is dominated by two large basins, the Al-Jafr basin in …
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Space charge resulting from imperfections and effects thereof in ionic crystals
… neutrality is a consequence of the presence of potential fields beneath the surfaces and around edge dislocations. These potential fields~ resulting from imperfection space charge~ modi,fy the innate free formation energies of the defects in a manJ:!ier such that bulk electrical neutrality …
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Integration of potential field theory and proportional navigation theory to autonomously guide an unmanned aerial vehicle.
… UAVs, and developing a new method by combining potential fields, typically used for obstacle avoidance, and proportional navigation, a popular missile guidance algorithm. The new algorithm modifies the old algorithms to allow a UAV to track an optimal path to, and rendezvous with, a moving …
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INTELLIGENT PATH SEARCHING AND POSE ESTIMATION
… Based on personal space assumption, artificial potential fields have been redesigned such that human’s emotion detected from facial expressions is taken into consideration in obstacle avoidance.
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Potential field theory and its applications to classical mechanical problems
Advances in many scientific fields are expected to come from work in nanotechnology. Engineering at nano-scales presents novel problems that classical mechanics cannot solve. Many engineers are uncomfortable designing at this level because classical or continuum mechanics does not apply and quantum …
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Control of an indoor autonomous mobile communications relay via antenna diversity
… collision avoidance is provided by artificial potential fields. Extremum-seeking is model-free adaptive control method; it's applicable in situations where there is a nonlinearity in the control problem and the nonlinearity has a local minimum or maximum. The extremum-seeking controller …
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Hydrodynamic Interactions of an Unmanned Underwater Vehicle Operating in Close Proximity to a Moving Submarine
… as a result of the interactions between their potential 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 …
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Reactive Navigation of an Autonomous Ground Vehicle Using Dynamic Expanding Zones
… approaches for off-road navigation. The Potential Field algorithm has been a popular reactive approach for low speed, highly maneuverable mobile robots. However, as vehicle speeds increase, Potential Fields becomes less effective at avoiding obstacles. The traditional shortcomings of the …
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An Extended Potential Field Controller for use on Aerial Robots
… on the design and implementation of an extended potential field controller (ePFC) which enables a quadcopter aerial robot to track a dynamic target while simultaneously avoiding obstacles in the environment. The design of the ePFC extends the foundational concepts of a traditional potential field …
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Coalition Formation In Multi-agent Uav Systems
… in a realistic simulated environment. Social potential fields provide a means of modeling a clustering attractive force at the same time as a collision-avoiding repulsive force, and are used by the simulation to maintain aircraft position relative to other UAVs.
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Magnetic micro-confinement of quantum degenerate gases
… the interaction between the external confining potential fields and the different types of quantum particles, this research is conducted through two separate but not different phases. We performed theoretical and/or experimental investigations, for both phases, at the vicinity of the magnetic …
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