摘要
设计具有变形能力的飞行器结构,通过主动改变其气动外形是提高空天飞行器飞行能力和环境自适应性的有效途径。本文提出了一种可实现单侧弯曲与多级伸展变形的空天飞行器非圆截面变体头锥机构设计方法,可独立进行头锥的多级伸展及弯曲运动,实现变体形式多样化;通过在伸展机构级间设计锁定装置,保证了头锥变形的展开稳定性。结合飞行工况,计算了头锥伸展过程中所受载荷及所需驱动力。头锥伸展及弯曲运动仿真结果论证了方案的可行性。在给定驱动模式下头锥机构的轴向最大伸展位移与体长比为0.43,伸展弯曲比可达3.5。通过分析变形过程的位移、速度及加速度变化规律发现,所设计的变体头锥机构可实现较好的运动特性和运动平稳性。
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.
作者
吴祥兵
赵杰亮
WU Xiang-bing;ZHAO Jie-liang(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)
出处
《宇航学报》
CSCD
北大核心
2021年第7期830-838,共9页
Journal of Astronautics
基金
国家自然科学基金(51805293,52075038)
北京理工大学青年教师学术启动计划。
关键词
空天飞行器
变体头锥
伸展机构
载荷分析
运动分析
Aerospace vehicle
Morphing nose cone
Deployable mechanism
Load analysis
Kienmatics analysis
