FAST主反射面节点运动控制算法

Control Algorithm with Node Movement of the Active Reflector for the FAST

500 m口径球面射电望远镜FAST的创新技术之一是主动反射面。2 300个控制反射面运动的控制器在收到上位机发送的观测指令后,通过规划算法计算节点的目标长度,驱动电机运动。电机带动促动器丝杠伸缩,使得在照明口径内反射面由球面变成抛物面,实现反射面整网控制。对节点运动速率算法进行了优化,优化目标为在满足控制精度的前提下,选取适当的控制周期,使得电机的启停次数最少,减小电机磨损。为FAST主反射面控制选择何种电机提供参考。

The active reflector is one of innovation on five hundred meter aperture spherical telescope-FAST.2300 controllers control movement of the reflector.When controllers receive observed commands from PC,target length of node is calculated through the planning algorithm.Controller actuates the motor,it makes lead screw elongation or contraction so that the reflector from sphere into paraboloid within the illumination area,achieves whole network control.Node motor velocity and control algorithm are optimized.The optimized target is under the control accuracy,select the appropriate control period,reduce start number of motor,and thereby reduce motor wear.A available method on selecting motor type for the FAST will be provided.