Title page for ETD etd-10242005-124127


Type of Document Dissertation
Author Huang, Ximing
URN etd-10242005-124127
Title Structural optimization and its interaction with aerodynamic optimization for a high speed civil transport wing
Degree PhD
Department Aerospace Engineering
Advisory Committee
Advisor Name Title
Haftka, Raphael T. Committee Chair
Grossman, Bernard M. Committee Member
Johnson, Eric R. Committee Member
Mason, William H. Committee Member
Plaut, Raymond H. Committee Member
Keywords
  • Airplanes Wings Design
  • Aeroelasticity
  • Airplanes Wings Aerodynamics
Date of Defense 1994-09-14
Availability restricted
Abstract

A variable-complexity design strategy with combined aerodynamic and structural optimization procedures is presented for the high speed civil transport design (HSCT). Variable-complexity analysis methods are used to reduce the computational expense. A finite element-model based structural optimization procedure with flexible loads is implemented to evaluate the wing bending material weight. Static aeroelastic effects, evaluated through the comparison of rigid and flexible wing models, are found to be small in the HSCT design. The results of structural optimization are compared with two quasi-empirical weight equations. Good correlation is obtained between the structural optimization and one of the weight equations. Based on this comparison, an interlacing procedure is developed to combine both the simple weight equations and structural optimization in the HSCT design optimization, at modest computational cost. HSCT designs based on the interlacing procedure reveal that the aerodynamic optimizer may take advantage of weaknesses in weight equation. However, the optimizer may be unable to escape the local minimum due to the noisy of aerodynamic response and the lack of derivative information for the interlacing procedure.

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