Design and screw dynamics of a six-bar bionic morphing wing

Morphing wings enable aircraft to optimize aerodynamic performance throughout various flight phases. Nevertheless, high-maneuverability aircraft impose new demands, especially with transient wing shape adjustments. Drawing inspiration from the plunge-diving behavior of the northern gannet, this paper investigates a six-bar morphing-wing mechanism of a single degree of freedom. A multiobjective genetic algorithm is developed to optimize the length of each link in the mechanism. To assess the kinematic and dynamic performance of the morphing wing under the external loads at different stages of folding/unfolding, a unified analysis method based on screw matrices is introduced. Kinematic parameters, including displacement, velocity, and acceleration, are computed in the absolute coordinate system and serve as the direct inputs for dynamics analysis. The findings of this research contribute to the advancement of morphing-wing technologies, offering potential applications in high-speed flight. Moreover, the proposed screw dynamics modeling method presents an efficient approach for the dynamics analysis of multibody systems.