Results 121 to 130 of about 3,036 (184)
Simulation of an Isolated Tiltrotor in Hover with an Unstructured Overset-Grid RANS Solver [PDF]
, 2009 An unstructured overset-grid Reynolds Averaged Navier-Stokes (RANS) solver, FUN3D, is used to simulate an isolated tiltrotor in hover. An overview of the computational method is presented as well as the details of the overset-grid systems.
Biedron, Robert T. +1 more
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NDARC-NASA Design and Analysis of Rotorcraft Theoretical Basis and Architecture [PDF]
, 2010 The theoretical basis and architecture of the conceptual design tool NDARC (NASA Design and Analysis of Rotorcraft) are described. The principal tasks of NDARC are to design (or size) a rotorcraft to satisfy specified design conditions and missions, and ...
Johnson, Wayne
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AIP AdvancesFlight safety in a tiltrotor aircraft is highly sensitive to vibration-induced instabilities during transition between vertical and horizontal flight modes.
Chengxiao Li, Yonggang Yang
doaj +1 more source
NASA highlights, 1986 - 1988 [PDF]
Highlights of NASA research from 1986 to 1988 are discussed. Topics covered include Space Shuttle flights, understanding the Universe and its origins, understanding the Earth and its environment, air and space transportation, using space to make America ...
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Technology Assessment for Large Vertical-Lift Transport Tiltrotors [PDF]
The technical community has identified rotor efficiency as a critical enabling technology for large vertical-lift transport (LVLT) rotorcraft. The size and performance of LVLT aircraft will be far beyond current aircraft capabilities, enabling a ...
Germanowski, Peter J. +2 more
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Urban Air Mobility Network and Vehicle Type - Modeling and Assessment [PDF]
This paper describes exploratory modeling of an on-demand urban air mobility (UAM) network and sizing of vehicles to operate within that network. UAM seeks to improve the movement of goods and people around a metropolitan area by utilizing the airspace ...
Kohlman, Lee W. +2 more
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Conceptual Design of Environmentally Friendly Rotorcraft - A Comparison of NASA and ONERA Approaches [PDF]
In 2011, a task was initiated under the US-French Project Agreement on rotorcraft studies to collaborate on design methodologies for environmentally friendly rotorcraft. This paper summarizes the efforts of that collaboration. The French and US aerospace
Basset, Pierre-Marie, Russell, Carl
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Large Civil Tiltrotor (LCTR2) Interior Noise Predictions due to Turbulent Boundary Layer Excitation [PDF]
The Large Civil Tiltrotor (LCTR2) is a conceptual vehicle that has a design goal to transport 90 passengers over a distance of 1800 km at a speed of 556 km/hr.
Grosveld, Ferdinand W.
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Nonlinear stability analysis of whirl flutter in a rotor-nacelle system. [PDF]
Nonlinear Dyn, 2018 Mair C, Rezgui D, Titurus B.
europepmc +1 more source
Rotor design optimization using a free wake analysis [PDF]
The aim of this effort was to develop a comprehensive performance optimization capability for tiltrotor and helicopter blades. The analysis incorporates the validated EHPIC (Evaluation of Hover Performance using Influence Coefficients) model of ...
Boschitsch, Alexander H. +3 more
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