Aero-structure coupled optimization of high aspect ratio wing using enhanced adaptive response surface method

As to improve the synthetical performance, the aero-structure coupled optimization of a high aspect wing is carried out. Due to the high aspect ratio feature of the wing, the coupling between aerodynamic and structural disciplines is considered. The parametric geometry method for high aspect wing is studied, CST method is used to represent the airfoil and a general parametric modeling tool for high aspect wing is developed based on UG through NX Open secondary programming. In the paper, CFD and FEA high fidelity models are adopted in both aerodynamic and structural disciplines, respectively, as to improve the analysis accuracy. The aero-structure coupled analysis is also implemented through an interpolation approach. The optimization procedure in this paper consists of two stages, namely, aerodynamic optimization of airfoil and aero-structure coupled optimization for high aspect ratio wing. For the purpose of reducing the computational cost, an enhance adaptive response surface method, called EARSM in this paper, is employed to execute the aero-structure coupled optimization of high aspect ratio wing. A in-house EARSM optimizer(EARSM-OPT) is also developed. The optimization results of a high aspect wing proves that the optimization approaches and procedures proposed in this paper can improve the aerodynamic and structural performance simultaneously, moreover, EARSM is beneficial to improve the optimization efficiency.