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.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access  LD5655.V856_1994.H8373.pdf 7.39 Mb 00:34:11 00:17:35 00:15:23 00:07:41 00:00:39 next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.

If you have questions or technical problems, please Contact DLA.