可变体头锥结构是改善空天飞行器气动性能的一种有效途径。为了实现空天飞行器对复杂环境的自适应性，本文基于伞式导杆机构设计了空天飞行器变体头锥结构，探讨了变体头锥的运动特性和运动平稳性。仿真分析了不同驱动方式下头锥变体过程中的运动学特性，得到了影响变体头锥工作性能和系统稳定性的主要因素。分析结果表明，所设计的变体头锥结构伸长量为1 499.6 mm，偏转量为500.7 mm，满足设计要求；与采用匀速运动模式相比，采用正弦运动规律驱动模式，基于伞式导杆机构的变体头锥具有较好的运动特性和运动平稳性。

The morphing nose cone for aerospace vehicle will provide a novel way for improving aerodynamic performance of reentry vehicle. In order to realize adaptability of the aerospace vehicle to the complex environment, a morphing nose cone of aerospace vehicle was presented by using a series of umbrella guide-rod mechanisms, and its kinematic characteristics and system stability were analyzed. Kinematic simulation analysis of the morphing nose cone under different driving modes was carried out to find out the influence of the main factors on its operation performance and system stability. Simulation results showed that the elongation and the deflection of the morphing nose cone were 1 499.6 mm and 500.7 mm, respectively, which meet the requirements of design. Comparing with driving mode of the constant speed, driving mode of the sinusoidal motion can makes the morphing nose cone running more stable.