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 22 for “"aircraft landing"”.
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Passive Viscoelastic Constrained Layer Damping Application for a Small Aircraft Landing Gear System
… key attributes of their applicability to a small aircraft landing gear system for improved damping performance. The applied viscoelastic damping treatment to the gear was of a constrained layer type, promoting increased shear deformation over free surface treatments, and therefore enhanced energy …
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Development of an Aircraft Landing Database and Models to Estimate Aircraft Runway Occupancy Times
… represents the methodologies used to develop an aircraft landing database and predictive models for estimating arrival flight runway occupancy times. In the second chapter, all the algorithms developed for analyzing the airport surface radar data are explained, and detailed statistical …
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Proving safety properties of an aircraft landing protocol using timed and untimed I/O automata : a case study
… an assertional-style verification of the aircraft landing protocol of NASA's SATS (Small Aircraft Transportation System) concept of operation using the timed and untimed I/O automata frameworks. We construct two mathematical models of the landing protocol using the above stated frameworks. …
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Integrated simulation and optimization in airfield networks
… operations and runway design problems. An aircraft landing simulation model is proposed to predict landing aircraft operations in airfield networks considering gate location and taxiway network information. By using the integrated simulation results, an improved dynamic programming model is …
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Real-Time Realization of Lidar – Based Digital Surface Models for Airborne Safe Landing Zone Identification in Challenging Environments
… the important applications for real-time DSMs is aircraft landing, especially in a degraded visual environment. In such a challenging environment, no clear visual conditions exist, which can potentially result in the loss of equipment and/or life. These conditions can be caused by snow, rain, …
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Runway Exit Speed Estimation Models
… reducing the runway occupancy time of an aircraft landing on a runway. The location of runway exits plays an important role in minimizing the runway occupancy time. Locating an optimal location for an exit is getting complex with a rapid increase in the number of aircraft types. So, the …
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Variable Strategy Model of the Human Operator
… including the longitudinal control of an aircraft during the visual landing task. The aircraft landing task becomes an acquisition maneuver whenever large initial offsets occur. Several different strategies are explored in the VSM formulation for the aircraft landing task. First, a …
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An integrated approach to the optimal runway exit locations
… future as the interarrival separations between landing aircraft are reduced. The intent of this research is to show that the use of high speed exits on runway contributes to the reduction of ROT, and therefore provides enhancement in runway capacity. However, locating the high speed exits is a …
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Adaptive neural controller based on convex parametrization
… is also shown through simulation studies of an aircraft landing problem that the proposed adaptive controller can lead to better learning of the underlying nonlinearity.
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Computational aeroacoustic modelling using hybrid RANS/LES methods with modified acoustic analogies
… mechanisms in tandem cylinders to understand aircraft landing gear as a primary contributor to airframe noise during approach and landing. Fluctuations in the flow properties induced by turbulence are computed as well as the corresponding propagations. A hybrid IDDES turbulence model is …
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Three-dimensional finite element modeling as a tool for flexible pavement design and analysis
… necessary because of the complexity of the landing gears and heavy loads imposed by heavier and bigger aircraft, like the Boeing 747-400, Airbus A380 and Boeing 777.</p> <p>The development of the finite element model required a finite element mesh design study and two verification studies …
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Multidisciplinary Design Optimization of Nose Landing Gears with Two Degrees of Freedom Considering Out of Plane Loading and Actuator Performance
… The design of lightweight retractable aircraft landing gear is a sophisticated multidisciplinary problem. It is difficult to finalize the design through manual iterations, especially under the demands of an accelerated product development process. MDO methodology has been previously …
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Modeling, Analysis and Testing of a Semi-Active Control System for Landing Gear Applications
… By replacing the standard damper oil in an aircraft landing gear and exposing the system to an appropriate magnetic field, the damping coefficients of the system can be changed almost instantaneously to accommodate nearly any situation. This trait allows a real time controller to monitor the …
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Biologically inspired composite image sensor for deep field target tracking
… for high-speed trains, computer assisted aircraft landing, and computer assisted spacecraft docking.</p>
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A decision problem involving the introduction of RTOL aircraft into commercial air transportation systems
… feasibility of introducing a reduced takeoff and landing (RTOL) aircraft into the national aviation system. In considering this problem, a multiple criteria decision model based on the responses of airline executives was developed to describe the RTOL utilization problem. The exact problem that is …
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Large Eddy Simulation Of Surface Pressure Fluctuations Generated By Elevated Gusts
… Wind gusts can also create unsafe conditions for aircraft landing. A ground based detection system that monitored elevated wind gusts can provide new information for pilots to use when determining whether or not it is safe to land. In addition, the ability to monitor elevated gust events would …
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Alternative Power Transfer for Passive RFID Systems in Challenging Applications
… Frequency Identification (UHF RFID) system on aircraft landing gear (LG) to permit component configuration management. It is shown that a monostatic RFID system with two reader antennas, one on the LG main fitting and one in the wing bay allows up to 64 kbits of data to be associated with each …
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Influence of tire-pavement thermomechanical interaction on contact stresses and rolling resistance
… strains. Furthermore, the turning maneuver of an aircraft landing gear tire on airfield pavements, which exhibits high tire-pavement contact stress levels, exacerbates the near-surface responses that may lead to shear and slippage distresses. In this study, the perspectives of tire and pavement …
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Optimal runway exit design and capacity enhancement
… time, a full information on the distribution of aircraft landing distance is required. The landing performance at a specific airport may be found by observing the actual landings. However, this is costly and may not be transferable to other airports. An alternative approach is to use a simulation …
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