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 51 for “"Reduced Frequency"”.
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Investigation of high reduced frequency, separated trailing edge flows
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1996.
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Unsteady response of a two-dimensional hydrofoil subject to high reduced frequency gust loading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Investigation of flows around a two dimensional hydrofoil subject to a high reduced frequency gust loading
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1992.
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All The King's Horses: The Delta Wing Leading-Edge Vortex System Undergoing Vortex Breakdown: A Contribution to its characterization and Control under Dynamic Conditions
… pressure distribution were recorded for a reduced frequency of 0.0089 and a Reynolds number of 1,300,000. The effect of deploying a set of cavity flaps <u>during</u> a dynamic pitch-up maneuver on the surface pressure distribution was recorded for a reduced frequency of 0.0089 and a …
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Shape sensitivity analysis of flutter response of a laminated wing
… plate analysis to predict the flutter speed, frequency, and reduced frequency of the wing. Three methods are used to calculate the sensitivity of the eigenvalue. The first method is purely a finite difference calculation of the eigenvalue derivative directly from the solution of the flutter …
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Parametric dependencies of aeroengine flutter for flutter clearance applications
… We introduce a new parameter, termed the reduced damping, g/p *, which collapses the combined effects of mechanical damping and mass ratio (blade mass to fluid inertia). Furthermore, the introduction of the compressible reduced frequency, K*, makes it possible to uniquely separate the …
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Cynicism and narcissism: masking the good life?
… time through a combination of effects leading to reduced frequency and density of grateful experiences, rather than decreasing the intensity of these events when they do happen"--Leaf iv.</p>
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Experimental Investigation of Transonic Shock Oscillations on NACA 0018 at Incidence
… region of the shock. This code calculated the frequency spectrum at regular points along the range of shock motion and plotted the spatial distribution of frequency spectra across all the points. This identified the location of the high-amplitude frequencies, which indicated the precise range …
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Synchronization in Coupled Opto-thermal Silicon MEMS Limit Cycle Oscillators
… cycle oscillations, self-synchronization, and frequency entrainment to an external drive. In this work, we chart the behavior of silicon MEMS oscillators that are nominally 40 µm long and 205 nm thick, mechanically coupled, and opto-thermally driven by a continuous-wave helium-neon laser. …
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Aerodynamics of a chined forebody oscillating in pitch
… angle of attack without sideslip. The effects of reduced frequency as well as free-stream Reynolds number were investigated by running a range of tunnel velocity/model oscillation frequency combinations. Reynolds numbers, based on the 3-inch base diameter of the forebody, of 1.4 x 10$\sp5$ to 2.8 …
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Electrophysiological characterization of a mouse deficient for oligophrenin1: a mouse model of X-linked mental retardation
… cognitive impairments. MR is characterized by reduced cognitive function with or without other clinical features, thus providing a direct approach to study the neurobiology of cognition and pathogenesis of MR. I propose in this thesis to clarify the underlying mechanisms responsible for the …
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Airfoil-vortex interaction and the wake of an oscillating airfoil
… a NACA 0012 airfoil about its quarter-chord at a reduced frequency of k = 2.05 and an amplitude of ±10° angle of attack. The target airfoil, a NACA 63₂A015, was immersed in the wake, two chord lengths downstream of the vortex generators trailing edge. Phase-averaged velocity measurements of the …
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Mean Loading and Turbulence Scale Effects on the Surface Pressure Fluctuations Occurring on a NACA 0015 Airfoil Immersed in Grid Generated Turbulence
… scale appears to be non-monotonic at low reduced frequencies, wr = Pi*f*c/U with both an increase and decrease in unsteady pressure magnitude occurring with increasing mean load. A reduced frequency overlap region exists at wr > 10 where the two different scale flows begin to produce …
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Experimental studies of flapping foils for energy extraction
… investigated were the non-dimensional flapping frequency of the foil, the non-dimensional excursion amplitude of the foil, and the profile of the foil path during a typical energy extraction cycle. The heave and pitch of the fin was approximated by a NACA 0012 foil heaving and pitching …
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Effects of repetitive transcranial magnetic stimulation as a treatment for persistent auditory verbal hallucinations
… eight dimensions: loudness, clarity, complexity, frequency, control, location, content and personification. AVHs are experienced by 70% of patients with schizophrenia and can cause high levels of stress and functional debility. Atypical antipsychotic drugs are the recommended treatment for AVHs …
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Effects of trans / supercritical behavior of carbon dioxide on power and propulsion applications
… of trans-critical conditions is unknown. A reduced order model framework was developed to assess the impact of droplet evaporation time on the combustion dynamics under sub-, trans- and supercritical conditions. This framework combines an analytical one-dimensional acoustic solver with a …
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Analysis of High Angle of Attack Maneuvers to Enhance Understanding of the Aerodynamics of Perching
Due to their vastly unsteady aerodynamics, mimicking the flight maneuvers of natural flyers requires a deep understanding of the unsteady flow physics while also demanding the ability to expand the vehicle's flight envelope beyond normal conditions. Experimental and computational investigations are …
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Development of biodegradable implants for sustained drug delivery
… has resulted in many patient benefits including reduced frequency of drug administration and reduced side effects. Implantable drug delivery benefits from these advantages, but importantly, can be removed if adverse effects necessitate it. In this thesis, reservoir and matrix-type subcutaneous …
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COHERENCE AND FREQUENCY STABILITY OF SEMICONDUCTOR LASERS UNDER CW OPERA TI ON AND MODULATION
… work is an investigation into the coherence and frequency stability of semiconductor lasers. The work begins with a brief review of the many varied techniques which have been proposed to achieve highly coherent. and stable semiconductor lasers. A computer simulation model of a semiconductor laser …
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Alternations in the Splenic Marginal Zone with Age
… old mice also statistically correlated with reduced frequency of marginal zone B cells. These findings further strengthen a partnership of marginal zone macrophages and marginal zone B cells. Furthermore, the phagocytic properties of marginal zone macrophages were examined live on a per cell …
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