A controlled deployment method for flexible deployable space antennas
A controlled deployment method for flexible deployable space antennas
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DOI：
10.1016/j.actaastro.2012.05.033
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发表时间：
2012-12
影响因子：
3.5
通讯作者：
Yiqun Zhang;B. Duan;Tuanjie Li
中科院分区：
文献类型：
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作者：
Yiqun Zhang;B. Duan;Tuanjie Li
针对空间柔性可展开天线的受控展开问题，提出了一种解耦控制方法。可变形天线体离散化与一个假设的位移场结构根据瑞利-里兹方法。结合拉格朗日法，建立了可展开天线的柔性多体动力学模型。基于展开轨迹的动力学分析和快速傅立叶变换（FFT）频谱分析的结果，使用滤波器将运动反馈信号解耦为两个独立的部分：刚性运动和由柔性因素引起的振动。在对机构进行瞬态结构模态分析的基础上，讨论了机构与结构的固有频率之间的联系，从而确定了低通滤波器的截止频率。根据解耦反馈的特点，分别设计了刚性和柔性控制器。刚性控制器确保天线沿指定轨迹沿着展开，柔性控制器抑制柔性振动。讨论了两种控制器增益参数之间的耦合关系，并基于能量相关性分析给出了参数选择的指导原则。以Astromesh型天线为例进行了数值仿真，验证了该方法的合理性和可行性。
A decoupling control method is presented for the controlled deployment of flexible deployable space antennas. The deformable antenna bodies are discretized with a hypothesized displacement field structured according to the Rayleigh–Ritz method. Combined with the Lagrange method, the deployable antenna's flexible multi-body dynamic model is established. Based on the result of a dynamic analysis and an Fast Fourier Transform (FFT) spectrum analysis of the deployment trajectory, a filter is used to decouple the movement feedback signal into two separate parts: the rigid movement and the vibration caused by flex factors. Based on the instantaneous structure modal analysis of the mechanism, the eigenfrequency affiliation between the mechanism and the structure is discussed, thus the cut-off frequency of the low-pass filter is determined. The rigid and flex controllers are designed according to the characteristics of the decoupled feedback respectively. The rigid controller ensures that the antenna deploys along a specified trajectory and the flex controller restrains the flex vibration. The coupling relationship of the gain parameters between the two controllers is discussed and a guideline for the proper parameter selection is proposed based on an energy correlation analysis. Numerical simulations of a practical application for an Astromesh-type antenna are carried out below, and these simulations demonstrate the rationality and feasibility of the proposed methodology.