中国科学院云南天文台机构知识库

为了实现满足动态性能需求的8m环形拼接太阳望远镜(8m-RST)主镜控制系统,结合8m-RST已有的有限元模型和准静态模型,针对环形拼接主镜倾斜传感器采样频率低且边缘传感器和倾斜传感器采样异步的特点,建立了主镜控制系统的数字控制器模型。通过提取系统模型的频率特性参数,获得了采样周期、相对稳定性、积分增益及控制带宽之间的关系。当采样周期为0.1 s且控制器积分增益为1.3时,可得到同时满足系统相对稳定性和控制带宽要求的主镜控制系统数字控制器。最后,引入脉动风干扰模型,通过仿真验证了主镜系统在平均风速较低的脉动风扰动影响下的主镜系统性能。说明8m-RST的主镜控制系统稳定且控制带宽满足0.2 Hz的设计要求,并能有效抑制平均风速为2 m/s的干扰。支撑了工程实现8m-RST的可行性,对8m-RST结构设计的改进、倾斜传感器设计和控制器设计都有重要的参考价值。 

For match the demand of dynamic performance of the 8m Ring Solar Telescope(8m-RST) primary mirror, considering the finite element model and quasi-static model of 8m-RST, asynchronous sampling tilt sensor and edge sensor, and low sampling frequency of tip sensor, an advanced primary mirror digital controller model is presented. The relationship between sampling period, relative stability, integral gain and control bandwidth are established by using the frequency characteristic parameter extracting from the model. When the sampling period is 0.1s and the integral gain of the controller is 1.3, digital controller of the primary mirror control system matches the demand of control bandwidth, gain margin and phase margin. Finally, a fluctuating wind model is applied to confirm the performance of the primary mirrorsystem. In summary, designed control system conforms to 0.2Hz bandwidth, 45 degree phase margin and 10dB gain margin, meanwhile this active primary has anti-interference ability of wind disturbance of 2m/s average wind speed. It has important meaning for mending structural of 8m-RST, designing tilt sensor and improving controller.