Composite Material Forward-swept Wing Aeroelastic Tailoring Technical Analysis And Research

The forward-swept wing has its unique and advantageous aerodynamic characteristics , such as better performance in high angle of attack flight, high critical Mach number, low wave drag and no wingtip stalling .however tensional divergence problem is an inevitable obstacle in the application of forward-swept wing aircraft. The use of advanced composite material and the concept of aeroelastic tailoring technology bring the forward-swept wing back to life.At the beginning of this thesis, the development and the research status of the forward-swept wing are reviewed. The mechanism of tensional divergence and the principle of how composite material aeroelastic tailoring technology solving tensional divergence is also introduced.Using a wing-box to illustrated the force condition of the structure of a real wing, deduce the bending -twisting coupled constitutive equations of the rectangular laminated wing-box through the theory of laminated plate. After that ,discussing the impact of composite materials aerodynamic tailoring factors from two different aspect, including:ply orientation,ply unbalanced level,the forward-swept angel,aspect ratio and Taper ratio.As two typical representatives of the forward-swept wing, a comparison of the flight Performance between X-29 and S-37 has been done in this thesis. After modeling the Finite element model, loading Aerodynamic loads in NASTRAN software package. Completing the optimization to meet the strength requirements in the first step, and then constructing an agent model, fitting out the objective function in order to improve divergent speed .finally aeroelastic tailoring technique of composite laminate is applied to a forward-swept wing structure to improve divergence speed.