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Comparison of Theodorsen's Unsteady Aerodynamic Forces with Doublet Lattice Generalized Aerodynamic ForcesThis paper identifies the unsteady aerodynamic forces and moments for a typical section contained in the NACA Report No. 496, "General Theory of Aerodynamic Instability and the Mechanism of Flutter," by Theodore Theodorsen. These quantities are named Theodorsen's aerodynamic forces (TAFs). The TAFs are compared to the generalized aerodynamic forces (GAFs) for a very high aspect ratio wing (AR = 20) at zero Mach number computed by the doublet lattice method. Agreement between TAFs and GAFs is very-good-to-excellent. The paper also reveals that simple proportionality relationships that are known to exist between the real parts of some GAFs and the imaginary parts of others also hold for the real and imaginary parts of the corresponding TAFs.
Document ID
20170009599
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Perry, Boyd, III
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
October 6, 2017
Publication Date
September 1, 2017
Subject Category
Aerodynamics
Report/Patent Number
NASA/TM-2017-219667
NF1676L-28080
L-20873
Funding Number(s)
WBS: WBS 432938.11.01.07.43.40.08
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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