Multi-fidelity Surrogate Model Based Wind Tunnel Structure Design Optimization

Wind tunnels are large-scale ground test facilities to conduct aerodynamic characteristic tests on various types of aerospace vehicles, advanced rail transport, and large buildings, are of great significance for the development of aeronautic and astronautic. To address the issues of complex design and analysis processes, as well as the over-design in traditional wind tunnel structure design, an optimized wind tunnel structure design method is developed that embeds the multi-fidelity finite element analysis model into the surrogate model. A primary Kriging model is trained with low-precision finite element samples. Next, a hierarchical Kriging model is constructed based on bridge function and high-precision finite element analysis samples supplemented. Then, the surrogate model could be updated automatically using expected improvement (EI) method. Experiments demonstrates that the new optimized structure for the acceleration section of wind tunnel achieving a 40% exceeded structural mass reduction with the constraints structural stress criterion, first-order natural frequency and deformation limitation.