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 47 for “"Heaving"”.
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Computational Fluid Dynamic Study of Heaving-to
… from the wake of a sail boat performing the heaving-to storm tactic in heavy weather seas with the waves. This interaction causes the wave height in the wake to be reduced. The fluid flow in the top layer of the wave is seen to move with the wake as the hull drifts with the wind. This …
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Analytical Modeling of a Heaving Wave Energy Converter
… generation to dedicate research efforts to. The heaving converter type is therefore chosen as an example of using simple analytical analysis in evaluating maximum theoretical capability of a single wave power generation mode – vertical translation. Given evidence of successful application of …
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Motor learning on a heaving plate via improved-SNR algorithms
… These algorithms are then demonstrated on a heaving foil, where it is shown to learn a flapping gait on an experimental system orders of magnitude faster than the dynamics can be simulated, suggesting broad applications both in controlling robots with complex dynamics and in the study of …
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Development of a constitutive model for a heaving clay from Rosebank
Heaving clays are partially saturated soils composed of a high fraction of the montmorillonite clay mineral. When exposed to free water they undergo volumetric expansion, which often results in differential movements at the surface and damage to building structures founded on the clay. The economic …
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Numerical simulation of dynamic stall for heaving airfoils using adaptive mesh techniques
In dieser Arbeit führen wir numerische Simulationen von Strömungen über absenkenden Flügelprofilen mit einer hochauflösenden Spektralen Elemente Methode durch. Es wird eine sehr detaillierte räumliche und zeitliche Beschreibung der Strömung erreicht. Die Ergebnisse, die wir bekommen haben sind mit …
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Fluid-Structure Interaction Modeling of a Flexible-Inflatable Heaving Wave Energy Converter Through Generalized Modes
The point absorber, one of the most popular types of ocean wave energy converter (WEC), usually consists of a rigid body buoy that can be efficiently modeled using existing WEC simulation tools. However, new wave energy technologies have looked to utilize flexible buoy structures to decrease costs, …
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Design, validation and application of wave-to-wire models for heaving point absorber wave energy converters
Ocean waves represent an untapped source of renewable energy which can significantly contribute to the energy transition towards a sustainable energy mix. Despite the significant potential of this energy source and the multiple solutions suggested for the extraction of energy from ocean waves, some …
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Uppfrysning i skogplanteringar på Island - en litteraturstutie med problemskrivning och åtgärdsförslag
… problems with seedling death due to frostheaving became more and more worrying. Several properties of Icelandic soils make them particularily prone to frost heaving. These properties together with climatic factors do that frost-heaving is a big problem in Icelandic forest plantations. When …
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An Experimental Investigation into the Passive Reconfiguration of Flexible Plates Near a Free Surface
… a flexible plate under prescribed oscillatory heaving motions. White light movies were recorded at constant frequency and varying proximity to the free surface to investigate the change in reconfiguration as the plate approaches the free surface. Results, analyzed in terms of deformed plate …
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Reliability Analysis of Braced Excavations
… modes of failure, namely buckling of struts, heaving of the base, and excessive settlement of the adjoining ground. The method was applied to braced excavations in medium to soft clays (mainly in Japan), and a range of reliability in current practice was examined. The strut-buckling mode of …
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An Experimental Investigation on the Performance of a Shape Changing, Bio-inspired F2MC Panel
… When tested in unsteady conditions in a heaving experiment (0.5 Hz to 2.3 Hz), the force measured at frequencies above 1.5 Hz were up to 3.6 times greater than those measured for frequencies below 1.5 Hz. Additionally, the phase difference between the tip deflection and force with respect …
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Making roughness : shaping site at Granger Bay
… Granger Bay. It is about deposition and erosion; heaving rubble and anchored shale. It is about a working "landschaft" of multiple overlapping contested uses. It is about abstracting natural forces to create architecture.
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Analyses and modeling of track transition site responses from instrumented bridge approaches
… in the transverse direction and displayed a heaving trend in the vertical direction. The heaving trend of the particles inferred to particle degradation that might occur in the field under impact forces. The insertion of small-sized particles for stone blowing simulations decreased this …
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Nonlinear steady and unsteady aerodynamics of wings and wing-body-combinations
… over delta wings. Symmetric motions (pitching, heaving) and asymmetric motions (roll, yaw) are considered. Then the method is generalized to treat the nonlinear three-dimensional steady flow for bodies and wing body combinations. Numerical examples include variety of shapes and comparison with …
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Cementitious stabilization of soils in the presence of sulfate
… by asphaltic concrete sometimes resulted in heaving. The causes for heaving and possible solutions were investigated. In the laboratory 2" x 4" molds of Winn Rock containing soil were prepared and cured in water bath at 40°C, sealed plastic bag at room temperature, and air. Molds were …
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Finite element analyses on cohesive soil behavior due to advanced shield tunneling
… were also examined to accurately simulate the heaving and tail void closure effects. The finite element simulation of the N-2 sewer project, which is the first advanced shield project in the United States, demonstrated that the prediction agreed consistently well with the observations in the …
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Inline motion in flapping foils for improved force vectoring performance
… the effect of adding in-line oscillation to heaving and pitching foils using a power downstroke. I show that far from being a limitation imposed by the muscular structure of certain animals, in-line motion can be a powerful means to either substantially augment the mean lift, or reduce …
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ΣΥΜΒΟΛΗ ΣΤΗΝ ΠΡΟΛΗΨΗ ΤΟΥ ΠΥΡΗΝΙΚΟΥ ΙΚΤΕΡΟΥ. ΑΞΙΑ ΤΗΣ ΜΕΘΟΔΟΥ ΤΗΣ SEPHADEX G25 ΧΡΩΜΑΤΟΓΡΑΦΙΑΣ ΓΙΑ ΤΗΝ ΑΠΩΤΕΡΗ ΕΞΕΛΙΞΗ ΙΚΤΕΡΙΚΩΝ ΝΕΟΓΝΩΝ
… BILIRUBIN ENCEPHALOPATHY ONE HAD SPUSORINEURAL HEAVING LOSS. ON THE CONTRARY NO ONE AMONG THE 55 BABIES WHO HAD SEPHADEX (-) MANIFESTED ANY SIGNSOF ENCEPHALOPATHY. THE RESULTS INDICATE THAT: A) THE SIMPLE AND RAPID SEPHADEX GEL FILTRATION TEST CAN "RECOGNIZE" JAUNDICED NEWBORNS WHO ARE PRONE TO …
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The aerodynamic and structural study of flapping wing vehicles
… aerodynamic forces on a thin aerofoil subject to heaving, pitching, and combined heaving and pitching motions are carefully studied. The analytical method is then employed to calculate the lift acting on the rigid flat plate undergoing small simple harmonic oscillations at different airspeeds and …
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Finescale abyssal turbulence: sources and modeling
… A boundary layer, formed by the interaction of heaving isopycnals by the tide and viscous/adiabatic boundary conditions, is investigated through direct numerical simulations (DNS) and Floquet analysis. Turbulence is sustained throughout the tidal period in the DNS on extra-critical slopes …
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