大型空间环形桁架天线反射器展开动力学模拟与实验研究  

Deployment dynamics simulation and ground test of a large space hoop truss antenna reflector

作　　者：李培[1] 马沁巍[1] 宋燕平[2] 刘铖[1] 田强[1] 马少鹏[1] 胡海岩[1] 

机构地区：[1]北京理工大学宇航学院,北京100081 [2]中国空间技术研究院西安分院,西安710000

出　　处：《中国科学：物理学、力学、天文学》2017年第10期3-11,共9页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(编号:11290151)资助项目

摘　　要：近年来,可展开环形桁架天线被广泛应用于航天领域,将其作为提升通信卫星水平的关键技术.环形桁架式天线反射器可以看作是由可展开环形桁架和柔性索网反射器组成的复杂刚-柔耦合多体系统.为了精确表征柔性构件发生的大转动、大变形运动特性,本文采用结合绝对节点坐标方法(ANCF)与自然坐标方法(NCF)的绝对坐标(ACB)方法对该系统进行建模.为了提高天线展开动力学模拟的计算效率,文中提出基于静力缩聚法和多层区域分解方法的并行求解算法实现大规模刚-柔多体系统动力学方程的高效求解.此外,为了精确反映反射器不同步展开现象,在展开动力学模型中考虑驱动力衰减的影响.最后,基于上述方法对环形桁架天线反射器展开的第二阶段进行动力学分析,并通过4 m缩比环形桁架天线地面实验验证数值模拟的结果.In recent years, the space community has paid much attention to the development of the hoop truss antenna of satellite so as to improve the quality of telecommunication of high frequency. The antenna reflector is mainly composed of a mesh net and a deployable ring truss, which can be considered as a rigid-flexible multibody system. During the research process of the hoop truss antenna of satellite, an accurate and effective dynamics model has to be built. In order to describe the flexible components in this system accurately, the Absolute-Coordinate-Based （ACB） method combining the Absolute Nodal Coordinate Formulation （ANCF） and Natural Coordinate Formulation （NCF） is used to predict the deployment dynamics of the reflector antenna. Furthermore, the parallel computation methodology based on the multilevel decomposition method and the Schur Complement method is used to improve the computational efficiency. Using the parallel computation methodology, the dynamic simulation of a rigid-flexible multibody system is efficiently completed based on the Message Passing Interface. To analyze the asynchronous deployment phenomenon in the ground test, the decrease of the driving force is applied to the antenna reflector model. Finally, based on the above method, a computational program is developed via the Fortran language to analyze the deployment dynamics of the hoop truss mesh antennas. Using the program, the second phase of the deployment process of the hoop truss mesh antennas is simulated, and the computational results are verified by a deployment experiment on the 4 m aperture antenna reflector.

关 键 词：环形桁架天线 绝对坐标方法 并行求解算法 地面实验 不同步展开 

分 类 号：TN820.84[电子电信—信息与通信工程]