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, the dynamic aerodynamic shape reconstruction capability of the variant aircraft can break through the bottleneck of aerodynamic efficiency and mission adaptability of traditional fixed-wing aircraft. In order to solve the problems of limited deformation freedom and difficulty in achieving distributed continuous deformation of existing mechanical metamaterial wings, this paper proposes a multi-mode allomorphic wing design scheme based on mechanical metamaterials. Firstly, by constructing a cell system with gradient mechanical properties, combined with the differentiated design of rigid bearing unit and flexible deformation unit, the coordinated control of structural lightweight and large deformation was realized. Secondly, the active drive cell element and the transition deformed cell element were further developed, and the parametric space arrangement strategy for the aerodynamic contour was established to form a full-lattice wing architecture with multi-modal collaborative deformation ability. Finally, based on finite element simulation and physical experiments, the overall torsional deformation and local thickness adjustment ability of the wing surface are verified. The results show that the proposed gradient metamaterial wing can achieve continuous torsional deformation with a spread of 12°/-9° and a thickness adjustment of 8% in the chordal 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 deforming aircraft.

Key words: mechanical metamaterials, deformation wings, multimodal allosterism, local variable thickness, Integral torsion