Numerical simulation of aeroelasticity basing on indentification technology of unsteady aerodynamic loads

This paper aims at providing an accurate and efficient method for aeroelastic simulation. System i-dentification is used to get the reduced order models of unsteady aerodynamics. LS(Least Square) method is used to estimate the coefficients of the input-output difference model. The reduced order models (ROM) are then used in place of the unsteady CFD codes for aeroelastic simulation. The efficiency is improved 1-2 orders while still retaining the accuracy of the complete unsteady CFD codes. Two standard aeroelastic computing examples (2D Isogai wing with S type flutter boundary and 3D transonic flutter example-AGARD445. 6 wing) are computed. The computed flutter boundaries based on ROM are well compared with those of the directly coupling CFD/CSD method. The identification technology of unsteady aerodynamic loads shows a high efficient and accuracy approach for transonic aeroelastic solving.