NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Applications of Laplace transform methods to airfoil motion and stability calculationsThis paper reviews the development of generalized unsteady aerodynamic theory and presents a derivation of the generalized Possio integral equation. Numerical calculations resolve questions concerning subsonic indicial lift functions and demonstrate the generation of Kutta waves at high values of reduced frequency, subsonic Mach number, or both. The use of rational function approximations of unsteady aerodynamic loads in aeroelastic stability calculations is reviewed, and a reformulation of the matrix Pade approximation technique is given. Numerical examples of flutter boundary calculations for a wing which is to be flight tested are given. Finally, a simplified aerodynamic model of transonic flow is used to study the stability of an airfoil exposed to supersonic and subsonic flow regions.
Document ID
19790045037
Document Type
Conference Proceedings
Authors
Edwards, J. W. (NASA Flight Research Center Edwards, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1979
Subject Category
AERODYNAMICS
Report/Patent Number
AIAA PAPER 79-0772
Meeting Information
Structures, Structural Dynamics, and Materials Conference(St. Louis, MO)
Distribution Limits
Public
Copyright
Other