Aero-structure-stealth coupled optimization for high aspect ratio wing using adaptive metamodeling method

As to improve the synthetically performance, the aero-structure-stealth 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. Since the aeroelastic deformation influences the stealth performance of the wing, the stealth analysis is performed following aero-structure coupled analysis to form the full aero-structure-stealth coupled analysis procedure. The parametric geometry modeling for high aspect wings is implemented. CST method is used to represent the airfoil and a general parametric modeling tool for high aspect wings is developed based on UG through NX Open secondary programming. In this paper, CFD, FEA and CEM high fidelity models are adopted for aerodynamics, structure and stealth analysis, respectively. The optimization procedure in this paper consists of two stages, namely, aerodynamics and stealth coupled optimization for the airfoil and aero-structure-stealth coupled optimization for high aspect ratio wing. The wing optimization is divided into two levels, i.e., the system level and subsystem level. For the purpose of reducing the computational cost, an enhanced adaptive response surface method(EARSM) is employed to run the aero-structure-stealth coupled optimization for a high aspect ratio wing. The optimization results of the high aspect wing manifests that the coupled analysis approaches and optimization procedures proposed in this paper can improve the aerodynamic structural and stealthy performance simultaneously, moreover, EARSM is beneficial to improve the optimization efficiency.