关键词: 力学超材料, 变形机翼, 多模态变构, 局部变厚度, 整体扭转

Abstract:

As a revolutionary paradigm of the next generation of aircraft， morphing aircraft features the real-time aerodynamic shape reconstruction capability， which can break through the limitation of aerodynamic efficiency and mission adaptability of traditional fixed-wing aircraft. In order to solve the issue of limited morphing freedom and difficulty in achieving distributed continuous deformation of the mechanical metamaterial wings， this paper proposes a multi-modal morphing wing design scheme based on heterogeneous mechanical metamaterials. Firstly， by constructing a basic unit-cell system with gradient mechanical properties， combined with the sequential design of rigid load-bearing unit-cell and flexible deforming unit-cell， the coordinated control of structural lightweight and large morphing capacity is realized. Secondly， the active actuating unit-cell and the transition unit-cell element are further developed， and the parametric space arrangement strategy for the aerodynamic contour was established to form a full-lattice wing structure with multi-modal collaborative morphing capacity. Finally， based on finite element simulation and morphing function experiment， the overall torsion and local thickness adjustment capacity of the wing surface are verified. The results show that the proposed gradient metamaterial wing can achieve continuous torsional deformation of 12°/-9° in the spanwise direction and thickness adjustment of 8% in the chordwise direction. The research results provide a new way to break through the optimization of cross-domain aerodynamic performance and multi-task adaptive control of aircraft， and have important engineering value for the development of intelligent morphing aircraft.

Key words: mechanical metamaterials, morphing wings, multi-modal morphing wing, local variable thickness, overall torsion