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 38 for “"Free Flight"”.
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Study of hypersonic aerodynamics using free flight experiments
… database (AEDB) documents the forces acting on a flight vehicle over its design range of attitudes and flight conditions. It is critical for calculating stability and designing control algorithms. Today, most hypersonic vehicle AEDBs are created numerically and validated with force balance …
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SOARNET, Deep Learning Thermal Detection for Free Flight
… used by birds and glider pilots to extend flight duration, increase cross-country distance, and conserve energy. This kind of powerless flight using natural sources of lift is called soaring. Once a thermal is encountered, the pilot flies in circles to keep within the thermal, so gaining …
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Investigation Into Free Flight Impact On Air Traffic Control
… concept of air traffic operations such as Free Flight. First, a baseline is established to determine how controllers operate under the current operation guidelines. Then flight trajectories are developed for different alternatives to the Free Flight operational concept. Finally, a …
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A study of the drying of single droplets in free-flight
… rates for individual droplets suspended in free-flight, were investigated using a specially-designed vertical wind tunnel, to simulate conditions in a spray drier. The technique represented a unique alternative method for investigating evaporation from unrestrained single droplets with …
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A Comparison of Pseudo 3-Dimensional Collision Avoidance-Predictor Displays for Free Flight
… that may be encountered due to the proposed free flight environment. In the first phase, three display concepts, using three different screen designs were compared. In this study, three different displays, all of which used using the space-time predictor concept developed in the previous …
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Evaluation of Perspective and Coplanar Cockpit Displays of Traffic Information to Support Hazard Awareness in Free Flight
… and avoid air traffic conflict in a part-task flight simulation paradigm. Thirty certified flight instructors from the Institute of Aviation at the University of Illinois flew a series of trials using one of three cockpit display of traffic information (CDTI) formats. A coplanar (two-panel) …
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A Modeling and Simulation Approach to the Small Aircraft Transportation System: Assessing Midair Conflict Potential Under the Free Flight Paradigm
… 2005 in Danville, VA with a highly publicized flight demonstration and exposition serving as the SATS proof of concept. The "Highways-in-the-Sky" (HITS) premise inherent to SATS is arguably its biggest enabler, and it depends heavily on the idea of free flight. HITS will potentially be the …
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Modeling next generation air traffic control system with petri net
… system will transition to a new system known as "Free Flight". "Free Flight" will change today's ATC system by giving pilots increased flexibility to choose and modify their routes in real time, thereby reducing cost and increasing system capacity (Nordwall, 1995). In this work, the modules and …
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The development, optimisation and testing of an unmanned parafoil launch system
… parameters and characteristics of the system in free flight. Flexible ram-air inflated parafoils display high sensitivity to atmospheric disturbances which complicates the comparison of measured flight-dynamic data to theoretical models in an open air free flight test. In order to improve the …
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Transport processes in a direct numerical simulation of turbulent channel flow
… in the near wall region by turbophoresis and by free-flight. They deposit due to their own inertia. A new method for identifying free-flight particles is presented and a prediction of free-flight deposition is made using fluid velocity distributions. The third subject involves the effect of …
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Modeling Aircraft Position and Conservatively Calculating Airspace Violations for an Autonomous Collision Awareness System for Unmanned Aerial Systems
… supports aircraft engaged in the following three flight modes: free flight, flight path following and orbits. The conflict calculator uses the FSE result to calculate the conflict probability between an aircraft and airspace or another aircraft. Finally, the CAPlugin determines the highest …
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Aerodynamic Parameter Identification of a Venus Lander
… model for a Venus lander based on experimental free-flight data. The experimental free-flight data were collected in the NASA Langley 20-ft Vertical Spin Tunnel with a 25-percent Froude-scaled model. The experimental data were classified based on the wind tunnel run type: runs where the lander …
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Reações de impulso em mecanismo articulado plano com folga nas articulações
… at the joints were evaluated during impact and free flight modes. External and inertia loads are accounted for. The analysis was applied to a similar linkage witha out clearances, for camparisan purposes. Digital programs were prepared for both phases of research, and numerical examples are …
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Trajectory optimization and data-driven modeling for robotic bat flapping flight
Planning flight trajectories is essential for practical application of flying systems. This topic has been well studied for fixed and rotary winged aerial vehicles, but far fewer works have explored it for flapping systems. Trajectory planning requires a model that is both accurate and …
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Development and Validation of Feature-Based Vision Algorithms for Autonomous Ship-Deck Landing
… occlusion, glare, and low illumination, and free flight. The results indicated that while the algorithm can utilize realistic landing pad designs, a feature-rich, custom landing pad image is needed for good performance. With this customized reference image, the algorithm was found to …
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The Role of EEG Biofeedback Training Preceding an Automated Monitoring Task
… air traffic management under the term "free-flight". The plans for a new system would incorporate, to a high degree, automation technologies that may have important human factors implications. One such concern speaks to quality of mental involvement as authority roles change. This …
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Development of a Computer Based Airspace Sector Occupancy Model
… sectors for a given geometry of sectors and flight schedules, and can be used to study the impact of alternative flight schedules on the workload imposed on the sectors. Along with complimentary airspace analysis models, this can serve as an advisory tool to approve flight plans in the Free …
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Design, Modeling and Testing of a Cascaded Heading Stabilization Controller for a Cruciform Parachute System
… without requiring substantial amounts of free-flight testing. Second, a cascaded control structure is proposed to facilitate enhanced performance in disturbance rejection and setpoint tracking of the parachute heading compared to the existing single-loop PID controller. This approach to …
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Computational and Experimental Investigation of the Aerodynamics of a W-shaped leading edge reversed delta plan-form wing
… flow field. Both low-speed and high-speed free-flight results revealed that the wing exhibits soft stall and a good lift-to-drag ratio, as well as statically stable pitching moment response up to stall conditions. Maximum lift was reached at 14°< α < 16°, giving a lift-to-drag ratio of 18. …
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