1. INTRODUCTION: Aero elasticity is the study of the interaction of inertial, structural and aerodynamic forces on aircraft, buildings, surface vehicles etc. 2. AERO ELASTICITY STATIC AEROELASTICITY DIVERGENCE CONTROL REVERSAL DYNAMIC AEROELASTICITY FLUTTER BUFFETING TRANSONIC 3. A BIT OF HISTORY: Control surface flutter Became a frequent phenomenon During World War-I It was solved by placing a mass balance around the control surface Hinge line 4. Divergence is a phenomenon in which the elastic twist of the wing suddenly becomes theoretically infinite, typically causing the wing to fail spectacularly. Control reversal is a phenomenon occurring only in wings with ailerons or other control surfaces, in which these control surfaces reverse their usual functionality DIVERGENCE CONTROL REVERSAL: STATIC AEROELASTICITY 5. FLUTTER: Dynamic instability of an elastic structure in a fluid flow. Cause: positive feedback between the body's deflection and the force exerted by the fluid flow. DYNAMIC AEROELASTICITY 6. BUFFETING: A high frequency instability, caused by Airflow separation or shock wave oscillation From one object striking another. EFFECT: Generally it affects the tail unit of the aircraft structure due to air flow downstream of the wing. TRANSONIC: A phenomena that impacts stability of aircraft is known as transonic dip, In which flutter speed can get close to flight speed 7. AERO ELASTICITY AND CONTROLS: An aircraft manoeuvres – deploying flight control surfaces into the airflow, which modify the lift of the surfaces. 8. ACTIVE AERO ELASTIC WING: First flight- 8 December 2006 Role- technology demonstrator National origin- USA Manufacture- McDonnell Douglas Northrop corporation DESIGN AND DEVELOPMENT: Boeing X-53 Active Aero elastic Wing 9. MERITS & DEMERITS: Aero elastic twist can be controlled Enables the use of high aspect ratio, thin, swept wings Provide excellent high speed rolling performance No additional stiffness was added for static aero elastic issues Overall control authority is affected 10. FUTURE OF AEROELASTICITY Aero elasticity is a very vibrant research topic. Several improvements to aero elastic design processes being developed are: –Very large, fully coupled CFD/CSD aero elastic models –Aero elastic tailoring –Active aero elastic structures 11. THANK YOU...