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 3013 for “"wake"”.
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Wake guard: Protecting smart speakers’ wake words with audio watermarking
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Application of Finite-State Wake Models to Rotors Re-entering Their Own Wake
… the development of a finite-state, dynamic wake model for the purpose of modeling a helicopter rotor reentering its own wake. This model stems directly from both the Peters-Morillo wake model to determine the velocity field on and above the helicopter rotor and the Peters-Fei model to …
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Electro-magnetic control of cylinder wake
… closed-loop control algorithms for manipulating wake flows past a solid cylinder in an electrically low-conducting fluid (e.g. seawater). The intent is to avoid both vortex shedding and flow separation from the body. It is desired to reduce the mean drag significantly and prevent the lift from …
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Alchemy and <i>Finnegans Wake</i>
<p><em>Finnegans Wake</em> is the result of a modern alchemical process; it is the literary <em>lapis</em>, the artistic equivalent of the Philosopher’s Stone. The book contains references to alchemical techniques, processes, ingredients, and equipment, as well as to various alchemists and …
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The Near Wake of a European Starling
The wake of a freely flying European starling (Sturnus vulgaris) was measured using high speed, time-resolved, particle image velocimetry, simultaneously with high speed cameras which imaged the bird. These measurements have been used to generate vector maps in the near wake that can be associated …
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Computational modeling of wind turbine wake interactions
… understanding of wind turbine aerodynamics and wake interactions. The following thesis work looks to study turbulence closure methods widely used in computational fluid dynamics (CFD) and their applicability for modeling wind turbine aerodynamics. The first investigation is a parametric study of …
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Wake closure conditions in plug nozzle flowfields
… The design of the nozzle involves complex wake structures that directly affect engine performance. In particular, the closed or open wake condition of the flow determines the dependence of the base pressure on the ambient environment, and therefore affects overall thrust. An experimental, …
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In the wake of a tidal turbine
… as the flow from upstream devices (i.e. the wake) interacts with down-stream devices. Further experimental data is necessary to understand the characteristics of turbine wakes, in particular the wake far down-stream. This work describes a series of physical tests undertaken to characterise …
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The structure of a trailing vortex wake
Experiments have been performed in the spiral wake that surrounds the vortex shed from the tip of a rectangular NACA 0012 half wing. Both single-point and simultaneous two-point hot-wire measurements were made ten chord lengths downstream of the wing at a Reynolds number of 320,000. The structure …
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Analysis of the ion current collection in the plasma wake during the Charging Hazards and Wake Studies (CHAWS) experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1997.
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Analysis of the ion current collection in the plasma wake during the Charging Hazards and Wake Studies (CHAWS) experiment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1995.
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Passive wake detection using seal whisker-inspired sensing
… display the harbor seal's ability to track the wake of an object several seconds after it swam by. In this work, I elucidate the basic fluid mechanisms that seals may employ to accomplish this detection. Key are the unique vortex-induced vibration (VIV) properties resulting from the geometry of …
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A Mathematical Model of the Sleep-Wake Cycle
The daily sleep-wake cycle usually consists of three distinct states: wakefulness, non-rapid-eye-movement (NREM) and rapid-eye-movement (REM). The process of switching between different states is complex, but a common assumption is that it is regulated primarily by two processes (the circadian and …
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Passive wake detection using seal whisker-inspired sensing
… harbor seal's extraordinary ability to track the wake of an object several seconds after it has swum by. They do so despite having auditory and visual cues blocked, pointing to use of their whiskers as sensors of minute water movements. In this work, I elucidate the basic uid mechanisms that seals …
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Propulsion through wake synchronization using a flapping foil
… through synchronization with an incoming Karman wake for both fish and mechanical flapping foils. Rainbow trout (Oncorhynchus mykiss) swimming within a flow channel voluntarily positioned themselves 4D downstream from a 2" D-section cylinder, and synchronized with the cylinder wake in both …
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Potential-flow Inflow Model Including Wake Distortion and Contraction
<p>Dynamic wake models have been used in real-time flight simulations for over thirty years. The models have evolved from the earliest, three-degree-of-freedom models (derived from momentum theory) to full finite-state models derived from potential flow theory by a formal Galerkin method. These …
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