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Accession Number
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N20120014566
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Title
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Unsteady Aerodynamic Modeling in Roll for the NASA Generic Transport Model.
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Publication Date
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Aug 2012
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Media Count
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16p
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Personal Author
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N. T. Frink P. C. Murphy V. Klein
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Abstract
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Reducing the impact of loss-of-control conditions on commercial transport aircraft is a primary goal of the NASA Aviation Safety Program. One aspect in developing the supporting technologies is to improve the aerodynamic models that represent these adverse conditions. Aerodynamic models appropriate for loss of control conditions require a more general mathematical representation to predict nonlinear unsteady behaviors. In this paper, a more general mathematical model is proposed for the subscale NASA Generic Transport Model (GTM) that covers both low and high angles of attack. Particular attention is devoted to the stall region where full-scale transports have demonstrated a tendency for roll instability. The complete aerodynamic model was estimated from dynamic wind-tunnel data. Advanced computational methods are used to improve understanding and visualize the flow physics within the region where roll instability is a factor.
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Keywords
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Aerodynamic stalling
Aircraft safety
Aircraft stability
Commercial aircraft
Computational fluid dynamics
Harmonics
Mathematical models
Nonlinearity
Oscillations
Roll
Rolling moments
Transport aircraft
Unsteady aerodynamics
Wind tunnel tests
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Source Agency
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National Aeronautics and Space Administration
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NTIS Subject Category
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51C - Aircraft
85A - Air Transportation
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Corporate Author
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National Aeronautics and Space Administration, Hampton, VA. Langley Research Center.
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Document Type
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Conference proceedings
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Title Note
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N/A
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NTIS Issue Number
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1308
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Contract Number
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N/A
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