Title page for ETD etd-10242005-174006

Type of Document Dissertation
Author Eldred, Lloyd B.
URN etd-10242005-174006
Title Sensitivity analysis of the static aeroelastic response of a wing
Degree PhD
Department Aerospace Engineering
Advisory Committee
Advisor Name Title
Kapania, Rabesh K. Committee Chair
Haftka, Raphael T. Committee Member
Johnson, Eric R. Committee Member
Librescu, Liviu Committee Member
Mason, William H. Committee Member
  • Airplanes Wings Testing.
  • Aerodynamic measurements.
Date of Defense 1993-02-05
Availability restricted

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 itself.

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