Topology Optimization Method for High-Aspect-Ratio Wing Considering Geometrical Nonlinearity with Directional Length Scale Control

The high-aspect-ratio wing, which is widely utilized in aircraft to achieve superior aerodynamic efficiency, frequently experiences large deformations during its service life.This work focuses on the topology optimization of the high-aspect-ratio wing using multiple materials considering geometric nonlinearity.To produce the spar-ribs structural layout, the directional length scale control is introduced by utilizing cylinder local search instead of conventional circle local search in the framework of the multimaterial topology optimization.The Neo-Hookean hyperelastic model is utilized to characterize the behavior of the original material to alleviate the numerical difficulties caused by geometric nonlinearity.Finally, the high-aspect-ratio wing is optimized and the results demonstrate that the spar-ribs structural layout is achieved with the directional length scale control.