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.
Results
Showing 1 to 16 of 16 for “"flight speed"”.
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Characterizing Locust Anemotaxis: The Impact of Sensory Perturbations on Flight Behavior
… the effects of sensory perturbations on locust flight behavior, with the goal of better understanding how locusts integrate multiple sensory inputs to maintain flight control. Through a series of experiments, locusts were subjected to visual impairment, turbulent wind conditions, mechanical …
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Numerical Study on Flow Separation and Performance Characteristics of Slot Nozzle
… engines.</p> <p>This study focuses on how flight speed affects the nozzle’s performance and flow patterns at altitudes between 0-30 km. Results indicate that adding flight speed to the slot nozzle allows the slot nozzle to perform better than the traditional bell nozzles at altitudes ≥ …
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Vibration control and gust alleviation of highly flexible blended-wing-body aircraft
… experience in high-altitude, long-endurance flights is critical to improving their flight performance and maintaining stable flight. Aircraft designed for high-altitude, long-endurance flights tend to be more flexible due to the design requirements of their missions. The aircraft may …
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Flow Control on an Airfoil Under Reversed Flow Conditions Using Nanosecond Dielectric Barrier Discharge Actuators
… helicopters present a solution to the forward flight speed limits of traditional helicopter configurations by reducing rotor speed during cruise to prevent supersonic flow over the advancing blade tips. However, the combination of decreased rotor speed and increased flight speed can result in …
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Dynamics and control of robotic aircraft with articulated wings
… put forth in light of the efficiency of flapping flight at small scales. These aircraft are naturally equipped with the ability to rotate their wings about the root, a form of wing articulation. This thesis covers some problems concerning the performance, stability and control of robotic aircraft …
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Airline schedule planning and operations : optimization-based approaches for delay mitigation
… thus far separate - disruption management and flight planning. We study different classes of models to generate robust airline scheduling solutions. In particular, we study, two general classes of robust models: (i) extreme-value robust-optimization based and (ii) chance-constrained …
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DMD and POD Modal Analysis for Store Separation
… the development of processes to identify failure flight conditions for store separation. The processes currently used for identifying potential failure conditions however are both resource intensive and iterative processes. A potential remedy to reducing resource use and improve turn around time …
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Flight characteristics of pen-reared and wild prairie-chickens and an evaluation of a greenhouse to rear prairie-chickens
… populations has met with marginal success. Flight characteristics, predator avoidance behavior, and rearing methods are possible factors contributing to post-release mortality of pen-reared birds. To evaluate flight characteristics and predator avoidance behavior of pen-reared APC's released …
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Electro-aerodynamic thrust for fixed-wing aircraft propulsion
… as a function of altitude and vehicle flight speed is quantified, where thrust-to-power ratio is estimated to decrease as both increase. Next, this thesis experimentally assesses the achievable thrust density of EAD propulsion. Current and thrust generated from arrays of electrode pairs …
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Are droneflies batesian mimics of honeybees?
… this behaviour in more detail. Analysis of flight behaviour showed unexpected similarities between the dronefly Eristalis tenax and the honeybee in the flight speed, time spent hovering and routes taken between flowers. Analysis of pollen in faeces indicated that the pollen diets of …
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From Oscillating Flat Plate to Maneuvering Bat Flight – Role of Kinematics, Aerodynamics, and Inertia
… aerodynamics, and inertia on maneuvering bat flights. At first, an ascending right turn of a H. pratti bat is investigated to elucidate on the kinematic features and aerodynamic mechanisms used to effectuate the maneuver. Deceleration in flight speed, an increase in flapping frequency, …
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Investigating bird flight characteristics and habitat use to better understand ornithological impacts of wind farms
… In this thesis I have highlighted how bird flight characteristics and habitat use can be better quantified and the consequences this may have for the assessment of the impacts of wind energy developments on birds.<br/>Assessing the risk of collision between birds and wind turbines is a …
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Bird strike risk assessment at commercial airports: sub-model development accounting for strike occurrence and severity with strike contributory factors
… airports, while other factors including wind speed, visibility and pressure, only have effects at certain airports. The study of bird strike severity evaluated the effects of a set of variables, such as airplane mass, engine type, number of engines, altitude, bird size, and strike position of …
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Variable pitch fan aerodynamics
… with stagger setting at design and take-off flight conditions, and how the engine design point defines the utility of a variable pitch fan. In reverse thrust operation, the objectives are to describe the previously unresolved fan-stage flow field, and to investigate the influence of fan-stage …
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Variation in wing area and prey detection volume of Rhinolophus Capensis in response to different climates
… broader wings allow for more maneuverable flight, and are advantageous for bats living in highly cluttered environments. Longer, narrower wings help bats to increase flight speed, and are best suited for bats living in more open environments. It is likely that wing shape is also influenced …
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Aeroelasticidad de una aeronave en presencia de nolinealidades estructurales concentradas
… inputs: structure, inertia, aerodynamics, and flight control systems (aeroservoelasticity). The classical approach considers linear models, hipothesis that must be reviewed under certain circumstances: inherent structural nonlinearities like freeplay or hysteresis on the control surfaces, …