复杂航天器密频挠性结构的在轨辨识和振动控制研究

项目名称： 复杂航天器密频挠性结构的在轨辨识和振动控制研究

项目编号： No.61304037

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 自动化技术、计算机技术

项目作者： 刘潇翔

作者单位： 北京控制工程研究所

项目金额： 26万元

中文摘要： 主动振动控制对提高复杂航天器平台稳定度和实现大天线高指向精度具有高度重要性。然而，大天线等挠性结构的周期性构型引起低频段模态密集问题，是掣肘主动振动控制在轨应用的主要因素之一。目前研究多停留于针对控制设计某环节，指出密集模态可能引发的问题，却鲜有解决方案。随着空间结构日益复杂化，从单一环节入手难以获得理想性能。 为此，本课题将深入分析密集模态特性及其影响，从整体上建立一套针对空间密频结构的主动振动控制理论和方案。考虑到密集模态强相关性引发溢出问题，在模型降阶时研究改进内平衡变换法，并在控制设计中提高对未建模动态的鲁棒性。对于密集模态不稳定性引发的模型不确知性，探索在轨辨识算法进行修正，同时研究具备自学习能力的智能振动控制方法避免过于保守和性能损失。对于密频系统的低可控/可观度，研究作动器/传感器的优化配置，从整体上提高系统可控/可观度，并探讨控制量的非线性组织方式以提高作动能力。

中文关键词： 密集模态；控制建模；在轨结构辨识；优化配置；模糊振动控制

英文摘要： For the complex spacecraft with large deployable antenna, active vibration control is of great importance to attitude stability and antenna pointing accuracy. However, large antennae, known as Large Flexible Space Structures(LFSS), often possess low damping ratios and close modes at low frequency, which potentially pose problems for active vibration control system. Research at present mostly remains at problem analysis stage, in limited aspect and with few solutions. Along with LFSS become increasingly long-span and complex, focusing on a single part of the vibration control system cannot guarantee a desirable performance. Therefore, based on analyzing the features of closely spaced modes, this project aims to establish systematic theory and methods of active vibration control for space structures with clustered modes. Considering the spillover problem caused by the high correlation between close modes, balanced reduction improving and more robust controller design are to be researched. As model uncertainty can easily arise due to the so called "unstable close modes", on-orbit modal parameter identification and intelligent vibration control will be both investigated as double insurance. For the low controllability and observability of close modes, actuator/sensor placement will be researched to optimize the over

英文关键词： close modes；control modeling；on-board structural identification；optimal allocation；fuzzy vibration control