Title page for ETD etd-10242005-174006
|Type of Document
||Eldred, Lloyd B.
||Sensitivity analysis of the static aeroelastic response of a wing
|Kapania, Rabesh K.
|Haftka, Raphael T.
|Johnson, Eric R.
|Mason, William H.
- Airplanes Wings Testing.
- Aerodynamic measurements.
|Date of Defense
A technique to obtain the sensitivity of the static aeroelastic response of a three dimensional
wing model is designed and implemented. The formulation is quite general
and accepts any aerodynamic and structural analysis capability. A program to combine
the discipline level, or local, sensitivities into global sensitivity derivatives is developed.
A variety of representations of the wing pressure field are developed and tested to determine
the most accurate and efficient scheme for representing the field outside of the
aerodynamic code. Chebyshev polynomials are used to globally fit the pressure field. This
approach had some difficulties in representing local variations in the field, so a variety
of local interpolation polynomial pressure representations are also implemented. These
panel based representations use a constant pressure value~ a bilinearly interpolated value,
or a biquadratic ally interpolated value. The interpolation polynomial approaches do an
excellent job of reducing the numerical problems of the global approach for comparable
computational effort. Regardless of the pressure representation used, sensitivity and response
results with excellent accuracy have been produced for large integrated quantities
such as wing tip deflection and trim angle of attack. The sensitivities of such things as
individual generalized displacements have been found with fair accuracy. In general, accuracy
is found to be proportional to the relative size of the derivatives to the quantity
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