JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

UNIT - I

Introduction to Aeroelasticity: Collar's aeroelastic triangle, interaction of aerodynamic, structural and inertial forces, static aeroelasticity phenomena, dynamic aeroelasticity phenomena, aeroelastic problems at transonic speeds, aeroelastic tailoring, active flutter suppression.

UNIT - II

Structural Dynamic Aspects: Generalized coordinates and generalized forces, Strain energy, kinetic energy and dissipation function, Lagrange’s equations of motion, Formulations of structural dynamics equation, Hamilton’s principle, and orthogonality conditions.

UNIT - III

Steady and Unsteady Aerodynamic Aspects: Small perturbation theory, Two-dimensional unsteady flow over wings, simple harmonic motion, Theodorsen’s function, arbitrary motion and Wagner function, gust problem, Küssner function.

UNIT - IV

Static Aeroelastic Problems: Static aeroelastic studies using strip theory - divergence, control effectiveness and control reversal; slender straight wing and swept wings, Static aeroelastic problems of low aspect ratio wings.

UNIT - V

Dynamic Aeroelastic Phenomenon – Flutter: Formulation of aeroelastic equations for a typical section, Torsion-flexure flutter – solution of flutter determinant, Method of determining the classical flutter speed using Theodorsen’s and U-g methods.

TEXT BOOKS:

• 1. Wright, J.R., and Cooper, J.E., Introduction to Aircraft Aeroelasticity and Loads, John Wiley and Sons Ltd, 2007.
• 2. Bisplinghoff, R. L., Ashley, H. and Halfman, R. L., Aeroelasticity, Addison-Wesley Publishing Company, Cambridge, Mass., 1955., Dover Pub., Inc., 1996, (BAH).
• 3. Fung, Y.C., An Introduction to the Theory of Aeroelasticity, Dover Publication, Inc., 1969.
• 4. Scanlan, R.H., and Rosenbaum, R., Introduction to the Study of Aircraft Vibration and Flutter, The MacMillan Co., 1962. R16 B.TECH AERONAUTICAL ENGG.

REFERENCES:

• 1. Főrsching, H.W., Grundlagen der Aeroelastik, Springer-Verlag, 1974. (Excellent book, written in German but easy to understand)
• 2. Bisplinghoff, R. L., and Ashley, H., Principles of Aeroelasticity, John Wiley and Sons, Inc., New York, N.Y., 1962. Also available in Dover Edition. (BA)
• 3. AGARD Manual on Aeroelasticity, Vols. I-VII, Beginning 1959 with continual updating. (AGARD)
• 4. Broadbent, E.G., The Elementary Theory of Aeroelasticity, Aircraft Engineering, 1954. R16 B.TECH AERONAUTICAL ENGG.