An Approximate Analysis of Wing Unsteady Aerodynamics

Item

Title
An Approximate Analysis of Wing Unsteady Aerodynamics
Date
1979
Index Abstract
Coming Soon
Photo Quality
Not Needed
Report Number
AFFDL TR 79-3046
Corporate Author
Wright State University
Laboratory
Air Force Flight Dynamics Laboratory
Date Issued
1979-05
Extent
43
Identifier
ADA079322
Access Rights
Approved for public release; distribution unlimited
Distribution Classification
1
Contract
F33615-76-C-3145
DoD Project
2307
DTIC Record Exists
No
Distribution Change Authority Correspondence
None
Abstract
A brief review of the unsteady aerodynamics in lifting surface theory is reported. For utility in design application, simplified but accurate analytical expressions were developed for generalized unsteady aerodynamics of wings of finite aspect ratio and sweep. This includes a means of calculating the unsteady lift load on the wing and tail surface of arbitrary shape and angle of attack variation. In addition, a formulation to include the indicial aerodynamics in the longitudinal equations of motion of the aircraft was performed. Sample numerical solutions to the longitudinal equations for a step input in elevator deflection are presented for the Navion aircraft. From these calculations, a noted difference in angle of attack and pitch rate response can be seen for the cases of unsteady and quasi-steady aerodynamics. The apparent increase in damping effects in the aircraft response due to the unsteady aerodynamics indicate that various design constraints might be relaxed somewhat if the unsteady aerodynamics is modeled properly.
Report Availability
Full text available
Provenance
AFRL/VACA
Type
report
Format
1 online resource
Creator
Wells, William R.
Media
AFFDLTR79-3046.pdf