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对分块拼接主镜主动控制是拼接镜技术的难点之一。本文建立了拼接主镜主动控制系统的模型,采用静态解耦的方式,将传递函数矩阵对角化,系统从多输入多输出的形式简化为单输入单输出的形式,并且建立了简化后控制系统模型。在此基础上,完成控制了系统的控制器设计。为了实现拼接镜的主动控制,在实验室中搭建了由四块正六边形子镜组成的拼接镜实验系统,由三个驱动器来控制每块子镜的倾斜和平移误差。在拼接主镜的共焦实验中应用该拼接主镜主动控制技术,单位倾斜误差校正时间为2.6 s,根据子镜倾斜的功率谱密度分析,动态倾斜误差校正带宽达到了0.34 Hz,实现了静态拼接误差的高效快速校正和动态误差的实时有效校正。
One of the difficulties of splicing mirror technology is the active control of the split mirror main mirror. In this paper, a model of the active mirror control system for a primary mirror is constructed. The static decoupling method is adopted to diagonalize the transfer function matrix. The system is simplified from single-input to multiple-output to single-input and single-output, and a simplified control System model On this basis, complete control of the system controller design. In order to realize the active control of the stitching mirror, a stitching mirror experimental system consisting of four regular hexagonal sub-mirrors is set up in the laboratory. Three drivers control the tilt and translation errors of each sub-mirror. In the confocal experiment of splicing primary mirror, the active mirror control technology was applied to the primary mirror. The unit tilt error correction time was 2.6 s. According to the power spectrum density analysis of the sub-mirror tilt, the dynamic tilt error correction bandwidth reached 0.34 Hz, Efficient fast correction of stitching error and real-time effective correction of dynamic error.