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 109 for “"the Landing"”.
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The stability of an aircraft during the landing roll
The object of this thesis is to determine the directional stability of a tricycle-geared aircraft during the landing roll. The motion of the aircraft is simulated by a computer program based on the appropriate equations of motion. Empirical aircraft and tire data are utilized in order to improve …
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The directional stability and control of an airplane during the landing roll
This thesis considers the problem of the directional instability, as exhibited by aircraft with tricycle landing gear, during the landing roll after touchdown. The approximate equations of motion are solved on an analog computer to describe the motion of an aircraft as it moves along the runway …
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Method for Kalman Filtering Pose Estimates from Lidar Scans During the Landing Phase
The Massachusetts Institute of Technology’s Lincoln Laboratory is developing a Lidar scanner to be used on a notional lander mission to Europa, a moon of Jupiter. The goal of this mission is to land safely on the unexplored rough terrain of the moon and analyze samples to detect the possibility of …
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Aircraft Greenhouse Gas Emissions during the Landing and Takeoff Cycle at Bay Area Airports
<p>The aviation industry is a growing industry and has global environmental impacts. Throughout all phases of air transit, pollutant emissions, including greenhouse gases (GHGs), are released. The goal of this study is to quantify and characterize these emissions produced from aircraft in the LTO …
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An investigation of the Landing Error Scoring System and clinically assessable sport-related injury risk factors
… relies on identifying individuals at risk. The Landing Error Scoring System (LESS) is a clinical injury risk screening tool suitable for large-scale screening without expensive equipment. However, psychometric properties, influencing factors, and differences in methodological procedures …
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Design of a robust integrated guidance and control algorithm for the landing of an autonomous reusable launch vehicle
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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The effect of varying mixtures of soybean and cereals on the landing rates of aphid vectors and spread of soybean mosaic virus (SMV) and maize dwarf mosaic virus (MDMV)
The goal of this study was to understand the influence of varying soybean/cereal mixtures on the incidence and spatial spread patterns of foregut-borne non-persistently transmitted plant viruses such as soybean mosaic virus (SMV) and maize dwarf mosaic virus (MDMV), and also on the landing rates of …
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An examination of the kinematics and behavior of mallards (Anas platyrhynchos) during water landings
This dissertation aims to address how a change in landing substrate may change landing kinematics. To examine this possibility, mallards (Anas playtrhynchos) were used as a study species and 177 water landings were recorded through the use of two camera systems with photogrammetric capabilities. …
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A mix-use design proposal of the Martin Luther King bridge : a study of the use of a bridge in a historic St. Louis riverfront
This thesis is a exercise in a design proposal on the levee of the Mississippi spanned by a 1950's steel bridge in a historic St. Louis district known as Laclede's Landing. My intentions are to introduce a connection between the river and the city that will provide access to the water's edge to …
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Modeling and Control of the UGV Argo J5 with a Custom-Built Landing Platform
<p>This thesis aims to develop a detailed dynamic model and implement several navigation controllers for path tracking and dynamic self-leveling of the Argo J5 Unmanned Ground Vehicle (UGV) with a custom-built landing platform. The overall model is derived by combining the Argo J5 driveline system …
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Aeroacoustic Study of a Model-Scale Landing Gear in a Semi-Anechoic Wind Tunnel
… was conducted on a 26%-scale Boeing 777 main landing gear in the Virginia Tech (VT) Anechoic Stability Wind Tunnel. The VT Anechoic Stability Wind Tunnel allowed noise measurements to be carried out using both a 63-elements microphone phased array and a linear array of 15 microphones. The …
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Involuntary Signal-Based Grounding of Civilian Unmanned Aerial Systems (UAS) in Civilian Airspace
<p>This thesis investigates the involuntary signal-based grounding of civilian unmanned aerial systems (UAS) in unauthorized air spaces. The technique proposed here will forcibly land unauthorized UAS in a given area in such a way that the UAS will not be harmed, and the pilot cannot stop the …
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Evaluating Dynamic ‘Landing Gear Unsafe’ Auditory Alerts as a Defense Against Habituation
… are widely used in today's daily routine. Unlike their visual counterparts, auditory alerts can be used to capture someone's attention, even though the user is not within visual range. As beneficial as auditory alerts can be, it is possible to become habituated to alerts. Habituation is the …
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Control and estimation strategies for autonomous MAV landing on a moving platform in turbulent wind conditions
… In particular, autonomous MAVs are promising in the field of drone delivery due to their scalability, deployability, and low cost compared to traditional ground delivery. Hybrid systems, which combine MAVs taking off and landing from/to trucks and the ground vehicles themselves to increase …
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Mission design for safe traverse of planetary hoppers
… provide planetary surface mobility by reusing the landing platform and its actuators to propulsively ascend, translate, and descend to new landing points on the surface of a planetary body. Hoppers enhance regional exploration, with the capability of rapid traverse over hundreds to thousands of …
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Active and Passive Flow Control over the Flight Deck of Small Naval Vessels
Helicopter operations in the vicinity of small naval surface vessels often require excessive pilot workload. Because of the unsteady flow field and large mean velocity gradients, the envelope for flight operations is limited. This experimental investigation uses a 1:144 scale model of the U.S. Navy …
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Geologic Setting of the Phoenix Lander Mission Landing Site
<p>The Phoenix Lander touched down on the northern distal flank of the shield volcano Alba Patera in a ~150 km wide valley underlain by the Scandia Formation. The geomorphology and geology of the landing site is dominated by the ~0.6 Ga, 11.5 km wide, bowl-shaped impact crater, Heimdal, and its …
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Autonomous Landing of a Rotary Unmanned Aerial Vehicle in a Non-cooperative Environment using Machine Vision
Landing an Unmanned Aerial Vehicle (UAV) is a non-trivial problem. Removing the ability to cooperate with the landing site further increases the complexity. This thesis develops a multi-stage process that allows a UAV to locate the safest landing site, and then land without a georeference. Machine …
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Real-time Evaluation of Vision-based Navigation for Autonomous Landing of a Rotorcraft Unmanned Aerial Vehicle in a Non-cooperative Environment
Landing a rotorcraft unmanned aerial vehicle (RUAV) without human supervision is a capability that would significantly broaden the usefulness of UAVs. The benefits are even greater if the functionality is expanded to involve landing sites with unknown terrain and a lack of GPS or other positioning …
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