AAE 556 Aeroelasticity Lecture 13 Control effectiveness Aeroelastic tailoring Purdue Aeroelasticity

Control effectiveness rigid wing/springs model aileron Purdue Aeroelasticity

Purdue Aeroelasticity Invert the aeroelastic stiffness matrix Then solve for the two deflections Purdue Aeroelasticity

Swept wing lift due to full-span aileron deflection Purdue Aeroelasticity

Lift expression algebra Purdue Aeroelasticity

Aileron effectiveness measured as aileron lift effectiveness Purdue Aeroelasticity

The reversal dynamic pressure solution Purdue Aeroelasticity

Purdue Aeroelasticity Example - effects of sweep on aileron effectiveness unswept wing divergence at 250 psf. (qo) Reversal at 150 psf. Purdue Aeroelasticity

Summary-swept wing control effectiveness wing sweep changes the divergence dynamic pressure and lift effectiveness sweepback stabilizing - slight sweep only Sweep forward is aeroelastically destabilizing sweepback reduces lift effectiveness and control effectiveness Sweep forward increases lift effectiveness and control effectiveness Purdue Aeroelasticity

Aeroelastic tailoring Purdue Aeroelasticity

Tailoring for performance Purdue Aeroelasticity

Purdue Aeroelasticity Madeleine Vionett (1875-1975) Perfected the bias cut for clothing Cut on diagonal for form fitting Purdue Aeroelasticity

Purdue Aeroelasticity Early attempts HiMAT 1974-1979 time frame Remotely piloted Composite skins Purdue Aeroelasticity

Purdue Aeroelasticity The X-29 Purdue Aeroelasticity

Purdue Aeroelasticity Benefits Purdue Aeroelasticity

Stiffness tailoring model Next week Purdue Aeroelasticity

Purdue Aeroelasticity Homework for next week f1 f2 W K1 K2 Purdue Aeroelasticity