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 8 of 8 for “"tilt-rotor"”.
-
Analytical investigation of the tilt rotor whirl instability
… the whirl instability of a rotating propeller or rotor system. The mathematical model consists of rigid members with three degrees-of-freedom at the wing root and the wing-drive-shaft joints. In addition, each blade has lagging and flapping freedom. Two dimensional aerodynamics, including …
-
Autonomous Autorotation of a Tilt-Rotor Aircraft Using Model Predictive Control
<p>Tilt rotor vehicles are governed by FAA laws also used for conventional helicopters, which require autorotational maneuvering and landing given a total power failure. With low inertia rotors and high disk loading of tilt rotor vehicles, this already difficult task becomes significantly more …
-
A tilt rotor UAV for long endurance operations in remote environments
… preliminary vehicle and controller design for a tiltrotor UAV that achieves long endurance operation by combining autonomous takeoff and landing capabilities with a solar energy harvesting system. Mass and power models are developed for the proposed vehicle configuration to provide mission …
-
An Experimental Investigation of Ground Effect on a Quad Tilt Rotor in Hover and Low Speed Forward Flight
The performance of a Quad Tilt Rotor (QTR) in helicopter mode was experimentally studied in ground effect (IGE) and out of ground effect (OGE). A 0.03 geometrically scaled fuselage/wing model of the QTR was tested in hover and very low speed forward flight. Fixed-pitch propellers were used to model …
-
Mathematical modelling of tilt-rotor aircraft configurations. A comprehensive model for flight control system development and real-time piloted simulation.
L'abstract è presente nell'allegato / the abstract is in the attachment
-
System Level Optimization of Urban Air Mobility
… In a case study of the Bay Area, the tilt rotor or autogyro maximize the system top level objective of daily profit, reaching over $20 000 a day with 6-10 vertiports.
-
A vehicle design and optimization model for on-demand aviation
… configuration, the compound helicopter, the tilt wing, and the tilt rotor. Configurations with a higher lift-to-drag ratio, but a higher disk loading, generally weigh less and cost less to operate; configurations with a lower lift-to-drag ratio, but a lower disk loading, are quieter. Using …
-
Propeller Noise Prediction of an Urban Air Mobility Vehicle in Urban Environment
… unsteady loading scenarios: (i) transition (tilt) flight, (ii) edgewise inflow, and (iii) wake–propeller interaction. Each case emphasizes different physical mechanisms that dominate noise generation in UAM operations. Hybrid turbulence-resolving approaches—Detached Eddy Simulation (DES) and …