110m大射电望远镜的两自由度复合控制器设计

发布时间：2018-07-10 13:02

本文选题：大口径天线 + 复合控制　；参考：《中国科学:物理学力学天文学》2017年05期

【摘要】：针对110m大射电望远镜结构柔性大、固有频率低的特点,本文在传统伺服控制的基础上进一步考虑副反射面支撑结构对指向精度的影响,提出了一种两自由度复合控制器.该控制器由内外两环构成,外环是基于广义比例积分(Generalized Proportional Integral,GPI)的鲁棒控制器,其以副反射面支撑结构的振动量为输入,确定伺服的参考指令;内环利用线性二次型高斯(Linear Quadratic Gaussian,LQG)控制器以外环输出为参考,对天线伺服驱动部分进行控制.与目前已有的大口径天线控制方法相比,该控制器既可以有效抑制驱动部分的柔性振动,又能抑制副反射面的振动,进而提高大口径天线的指向精度.本文以等效天线模型为控制对象.通过数值仿真验证了该方法的可行性.
[Abstract]:In view of the large flexible structure and low natural frequency of 110m large radio telescope, based on the traditional servo control, the influence of the supporting structure of the secondary reflector on the pointing accuracy is further considered in this paper, and a two-degree-of-freedom composite controller is proposed. The controller is composed of two internal and external rings. The outer loop is a robust controller based on generalized proportional integral (GPI). The inner loop uses the output of the outer loop of the linear quadratic Gao Si (Linear Quadric Gaussian LQG) controller as a reference to control the servo drive part of the antenna. Compared with the existing control methods of large aperture antenna, the controller can effectively suppress the flexible vibration of the driving part and the vibration of the pair reflector, and then improve the pointing accuracy of the large aperture antenna. In this paper, the equivalent antenna model is taken as the control object. The feasibility of the method is verified by numerical simulation.
【作者单位】：西安电子科技大学电子装备结构设计教育部重点实验室;西安电子科技大学信息感知技术协同中心;中国科学院新疆天文台;
【基金】：国家重点基础研宄发展计划资助项目(编号:2015CB857100)
【分类号】：TH751

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