摘要
大型椭圆环形桁架式天线以其在偏馈型高精度网状天线应用上独特优势,吸引众多学者关注.大型椭圆环形天线展开过程复杂,在轨展开有一定风险,而天线在轨能否成功展开是决定卫星任务成败的关键.为了提高展开可靠性和部件受载安全性,必须借助仿真手段全面识别天线展开动力学特性,获取展开过程部件受载特性.大型椭圆环形天线属于典型柔性多体系统,采用几何精确梁实现对变形较大横杆、纵杆建模,并基于一维移动介质动力学理论对柔性绳索建模,结合对变形极小的铰链、斜杆等部件做刚性假设,实现其展开过程动力学建模及仿真.在此基础上,对天线展开不同步性现象及原因进行分析,得到部件柔性及绳子经铰链摩擦损耗是其重要内因;此外,从能量角度对展开进行分析,得到摩擦损耗及网面张力是影响驱动绳受力及杆件受力最重要因素.最后,为提高展开可靠度,给出了设计优化建议.
With the unique advantages in the application of bias-feed high-precision mesh antennas, the large elliptical truss antenna(LETA) attracts attention of many scholars. Due to the complexity of the LETA deployment process, there are some potential risks in orbit development. The successful deployment of antenna on orbit is the key to determine the success or failure of satellite missions. In order to improve the deployment reliability and the load safety of the components of the antennas, the dynamic characteristics of the LETA must be fully identified by the means of simulation, and the load characteristics of the components during the deploying process must be obtained. As a typical flexible multi-body system, a geometric precise beam is used to model bars with large deformation in the LETA and the flexible driving cable is modeled based on one-dimensional dynamic medium dynamics theory. The dynamic modeling and numerical simulation of the deploying process are presented in the paper. On this basis, the unsynchronized phenomenon is analyzed, which is caused mainly by the flexibility of components and the friction loss of driving cable through the hinges. In addition, from the perspective of energy, it shows that friction loss and mesh tension are the most important factors affecting the loads of driving cable and truss. Finally, the design optimization suggestions are given to improve the reliability.
作者
马小飞
杨军刚
胡建峰
张欣
肖勇
赵治华
MA XiaoFei;YANG JunGang;HU JianFeng;ZHANG Xin;XIAO Yong;ZHAO ZhiHua(Xi'an Space Radio Academic Institution,Xi'an 710100,China;School of Aerospace,Tsinghua University,Beijing 100084,China)
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2019年第2期143-151,共9页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:U1537213)资助
关键词
椭圆天线
不同步性
动力学仿真
能量分析
large elliptical truss antenna
unsynchronized phenomenon
dynamic simulation
energy analysis
