基于POD降阶模型的气动弹性快速预测方法研究

FD/CSD coupled numerical simulation is the most accurate method in aeroelasticty but it is also with the lowest computation efficiency. A reduced order model (ROM) based on proper orthogonal decomposition (POD) for aeroelastic system was investigated in this paper. In order to further reduce the higher order of time-domain POD/ROM relative to frequency-domain POD/ROM, the balanced truncation method in control theory was introduced. The detail of the construction of time-domain POD/ROM was demonstrated with AGARD 445.6 wing and then the ROM was used to predict the aeroelastic dynamic response and flutter boundary. The numerical results show that the POD/ROM nearly has the same accuracy as the CFD/CSD coupled method while improves the computation efficiency with tens to hundreds times.