【作者】 刘绍奎； 闫桂荣；

【Author】 LIU Shao-kui1, YAN Gui-rong2 (1.China Academy of Space Technology, Beijing 100094, China; 2.Astronautics and Aeronautics College, Xian Jiaotong University, Xian 710049, China)

【机构】 中国空间技术研究院； 西安交通大学航天航空学院；

【摘要】 空间桁架结构在航天工程中被广泛采用,如运载火箭仪器舱、人造卫星天线、星箭接口支架、空间站骨架结构、有效载荷的支撑平台等。由于特殊的工作环境,在轨运行的空间桁架结构必须满足特定的稳定性和振动的要求,决定了对其进行有效振动控制的必要性。这类结构具有柔性大,固有频率低,模态密集,模态耦合,阻尼小,质量轻等特性,传统的控制方法已经不能满足系统的强鲁棒性、高精度和高可靠性要求。因此,需要发展振动主动控制方法,其中采用智能元件或功能材料进行主动控制来抑制空间桁架结构的振动是最重要的一个研究内容,并成为近年来十分活跃的研究领域。在国外,尤其是美国和欧洲,在航天领域的智能结构技术研究已经开始步入实用阶段,特别是在航空航天结构振动主动控制以及健康诊断监测方面的应用较为广泛。目前我国用于航天工程的智能结构振动控制技术和现阶段快速发展的航天事业很不相称,和航天器研制的需求也脱节。为了提高我国新型航天器的竞争力,十分有必要对航天器智能结构振动控制技术进行实用性研究。基于以上考虑,论文以航天工程为研究背景,设计了空间智能桁架结构,提出一种基于ε-滤波RLS算法的自适应逆控制结构,分析了结构的收敛性,并将基于ε-滤波RLS(Recursive Least Squares)算法的自适应逆控制结构引入空间桁架结构的振动主动控制中,完成了结构振动的主动控制实验研究。空间智能桁架结构的振动主动控制实验结果表明,基于ε-滤波RLS算法的自适应逆控制方法在空间桁架结构的振动主动控制中是一种十分有效的方法。本研究为即将开展的航天器智能结构设计与控制奠定了良好基础。更多还原

【Abstract】 The space truss structures have been used in spaceflight engineering widely, example for launch vehicle instrument cabin, satellite antenna, interface bracket of rocket and spacecraft, framework of space station, support platform of payload and so on. The space truss structures on-orbit must meet the requirements of stability and vibration because of its especial working environment and this fact determine the need of the vibration control effective for space truss. The space truss structure has the characteristic of big flexible, low-frequencies, closely modals, modals coupling, and weakly damp and light weight that causes the traditional control methods can not meet the requirement of the robust, precision and reliability of the system. So it is very important to develop active vibration control. The active vibration control adopted the smart component or function material was the mainly study scope that to restrain the vibration of the space truss structures and it has been become the flourish research domain recently. On overseas, especially in American and Europe, the spacecraft smart structure has been used in the practicality phase, especially used in the space structures active vibration control and structures health monitor widely. But now, the spacecraft smart structures study is not adapt to the rapid developing spaceflight project of our country. For heighten the capability of developing spacecraft, it is very important to investigate the active vibration control of the spacecraft smart structure in the practicality. In the background of spacecraft engineering, this article designed the space smart truss structure, put forward the RLS algorithm for adaptive inverse control based on ε-filter and analyzed the astringency of the control scheme. The experiment of space truss structure active vibration control has been achieved by using the RLS algorithm for adaptive inverse control based on ε-filter. The result demonstrated that the method is an effective technique by using the RLS algorithm for adaptive inverse control based on ε-filter. This work will provide the availability technique to the spacecraft smart structure design and control that will be performed shortly.更多还原