1. AAE 556 Aeroelasticity Lecture 13
Control effectiveness
Aeroelastic tailoring
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2. Control effectiveness rigid wing/springs model
aileron
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3. Purdue Aeroelasticity
Invert the aeroelastic stiffness matrix Then solve for the two deflections
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4. Swept wing lift due to full-span aileron deflection
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5. Lift expression algebra
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6. Aileron effectiveness measured as aileron lift effectiveness
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7. The reversal dynamic pressure solution
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8. Purdue Aeroelasticity
Example - effects of sweep on aileron effectiveness unswept wing divergence at 250 psf. (qo) Reversal at 150 psf.
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9. 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
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10. Aeroelastic tailoring
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11. Tailoring for performance
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12. Purdue Aeroelasticity
Madeleine Vionett ( )
Perfected the bias cut for clothing
Cut on diagonal for form fitting
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13. Purdue Aeroelasticity
Early attempts HiMAT
time frame
Remotely piloted
Composite skins
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14. Purdue Aeroelasticity
The X-29
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15. Purdue Aeroelasticity
Benefits
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16. Stiffness tailoring model Next week
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17. Purdue Aeroelasticity
Homework for next week f1 f2 W K1 K2
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