非圆截面变体头锥机构设计与运动仿真分析

It is an effective way by designing a vehicle with a variable aerodynamic shape to improve aerospace vehicle's flight performance and environmental adaptability. In this paper, a morphing nose cone mechanism with non-circular cross section for aerospace vehicle is designed, which can realize diversified deformation forms by independent stretching and bending of multi-section structures. A locking device is designed between the multiple sections of the deployable mechanism to ensure the stability of the nose cone deformation. Combined with the flight condition, the aerodynamic load and the driving force during the stretching process of the nose cone are calculated. Simulation results demonstrate the feasibility of the stretching and bending motion of the morphing nose cone mechanism. Under the given driving mode, the maximum axial elongation ratio of the morphing nose cone mechanism relative to its own body length is 0.43, and the ratio of the bending deformation can reach to 3.5. By analyzing the laws of the displacement, velocity and acceleration during the deformation process, it is found that the designed morphing nose cone mechanism can realize better motion characteristics and movement stability.