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 26 for “"crosswind"”.
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Reliability based analysis of the crosswind stability of railway vehicles
Die Seitenwindstabilität spielt heutzutage eine entscheidende Rolle im Zulassungsverfahren von Schienenfahrzeugen und wird oft zur zentralen Randbedingung im Entwurfsprozess. In vielen Ländern, einschließlich Deutschland, basiert der Sicherheitsnachweis auf der numerischen Simulation des …
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Optimizing openings through tall buildings to mitigate their crosswind response
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-05-01
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An experimental rig to investigate crosswind effects on intake flow behaviour
… One particularly problematic condition is the crosswind experienced during runway operations, which can lead to downstream distortion of the flow at the fan plane. Due to the complex nature of the ingested crosswind flow field, it has been found to be difficult to study in detail experimentally …
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The Effect of Crosswind and Turbulence in Mental Workload and Pilot Tracking Performance
… of this study was to evaluate the effect of crosswind and turbulence on mental workload and pilot tracking performance. Based on previous research, it was believed that as the amount of crosswind and turbulence is increased, mental workload would increase and tracking performance would …
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Analysis of fountain effect for tiltrotor configuration using computational fluid simulation and experimental method
… the model in both hover flight condition and crosswind condition replicated in the wind tunnel. To record data, a subsonic wind tunnel was utilized to test the wing/rotor configuration in different conditions of freestream velocity of V_∞=10, 15, and 20 m/s, the blade pitch angle of θ=5°, 10°, …
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AGRICULTURAL SPRAYS IN NON-UNIFORM CROSS-FLOW
… kPa pressure and subjected to 5 km/h (average) crosswind were characterized. In stage 2, size-velocity \ characteristics of droplets in sprays of 'fine' (from Teejet 8001) and 'medium' (from Teejet 8003) quality, were compared. In stage 3, the effect of variation in crosswind velocity on droplet …
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Measuring Optical Turbulence Parameters With A Three-aperture Receiver
… scintillometer unit which reports Cn2 and crosswind speed. There is also a weather station positioned at the receiver side which provides point measurements for temperature and wind speed. The Cn2 measurement obtained from the commercial scintillometer is used to infer l0, L0, and the …
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Effects of Duct Lip Shaping and Various Control Devices on the Hover and Forward Flight Performance of Ducted Fan UAVs
… are associated with these vehicles in crosswinds, namely momentum drag and asymmetric duct lift. Because the duct itself, and not the fan, is the root cause of these unfavorable aerodynamic attributes, various lip shapes were tested to determine the effects of leading edge radius of …
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Fluctuating concentrations in atmospheric dispersion
… Measurements of concentration at points along crosswind transects were taken over time periods of an hour at distances to several kilometers from the source. These measurements included both aerosol photometer records of the instantaneous concentration taken at a 1 Hz sampling rate and …
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Surface-referenced current meter measurements
… in the top 4m of the water column. In the crosswind direction observed, observed shear seems to be indicative of an across shelf pressure gradient and intense near-surface mixing.
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Flow Visualization Study of Wake-Stabilized Diffusion Flames in a Crossflow: Effects of Crossflow Turbulence
Effects of crosswind turbulence on the mechanisms and flow structures affecting emissions from non-premixed wake stabilized flames from elevated stacks are investigated. In the current work, two conditions of upstream crossflow are tested to investigate the effects of turbulence on the flame, …
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The role of the aerodynamic modifications of the shapes of tall buildings
… damping. This wind-induced motion, in particular crosswind response, endangers the dynamic response of tall structures, the performance of cladding and window, and the habitability of occupants. Therefore, much research on mitigating wind induced excitations of tall buildings has been carried out. …
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Design and analysis of a natural draft direct dry cooling system for a supercritical carbon dioxide power cycle for CSP application
… off-design ambient temperatures and approximated crosswinds on system performance characteristics. Finally, a co-simulation model is developed, integrating the 1-D discretised sCO2-side heat exchanger model with a 3-D computational fluid dynamics (CFD) air-side model. Compared to the preceding …
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Trim, Control, and Performance Effects in Variable-Complexity High-Speed Civil Transport Design
… gear integration. We include the engine-out and crosswind landing requirements, as well as engine nacelle ground strike for lateral-directional requirements. For longitudinal requirements we include nose-wheel lift-off rotation and approach trim as the critical conditions. We found that the …
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Development of an evaluation program for automotive instrument panel design
… driving workload, e.g., introduction of random crosswind and road curvature, (3) to expand the existing database on conventional IP tasks, (4) to examine the effects of IP macro- and micro-clutter on driver task performance, and (5) to investigate the issues related to control labelling, i.e., …
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Evaluation of aged woodstove catalysts
… The model also predicts that increasing the flue crosswind velocity from 0 to 5 m/s will increase the mass flow rate through the stove by 21%.
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Development and analysis of active rear axle steering for 8x8 combat vehicle
… of external disturbances will be tested using a crosswind simulation. The ZSS controller is a very responsive controller that increases the maneuverability at low speed and increases the stability at higher speeds. The responsiveness results in oversteering at mid range speeds and low lateral …
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Dynamic soaring beyond biomimetics: control of an albatross-inspired wind-powered system
… sail and keel, and most efficient when remaining crosswind at all times. The thin-shear analysis is then extended asymptotically, predicting in closed-form the most efficient dynamic soaring trajectory in wind shears of finite thickness. Building upon the conceptual study of dynamic soaring, a …
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A Monte Carlo ray trace tool for predicting contrast in naval scenes including the effects of polarization
… accurate slope statistics in both along-wind and crosswind directions. An original idea by the author was used to give a typical shape to the waves of the simulated ocean surface. The surface properties of the ship were determined using Fresnel's equations and the complex index of refraction of …
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Host-seeking behaviour in the malaria vector Anopheles Gambiae
… smooth and tortuous flight in up, down and crosswind directions in flows of clean and host odour-laden air, demonstrating a flexible suite of host-seeking behaviours. It is proposed that ‘dipping’ flight, consisting of high frequency vertical oscillations, may represent an alternative …
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