摘要
采用有限元方法,建立降落伞回收系统的多质点动力学模型,研究了牵顶伞在拉直过程中对主伞性能的影响。模型中将柔性大变形的伞绳、伞衣、连接带离散成若干绳段,各绳段假设为质量集中在中心的质点,各质点间以阻尼弹簧连接,其运动由对应绳段的重力、气动力和张力确定。利用该模型对某批次的空投试验进行了仿真,给出了张力、速度、位移等参数的瞬态变化。经过分析表明,牵顶伞能够改善主伞张力分布,抑制伞衣顶部横向摆动。
Based on the finite element method, the multi-mass dynamic model of a recovery parachute system is developed to study the main parachute performance using an attached apex drogue during the deployment. The large deformation flexible suspension line, the canopy and the connecting band are discreted into some nodes with their centralized mass on the centroid. Each node is modeled as a mass damping spring. The motion of each node is determined by the tension, aerodynamic force and gravity. Utilizing the model to simulate an air-drop experiment, the dynamic characteristics of the velocity, ten-sile force and displacement are provided. The analysis show that using the attached apex drogue during the deployment is beneficial to uniform tension force distribution of main parachute and inhibits the apex of canopy lateral swing.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2009年第2期198-201,共4页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
牵顶伞
降落伞
拉直过程
绳帆
动力学模型
attached apex drogue
parachute
deployment
line sail
dynamics model
