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对分块拼接主镜实现主动控制是拼接镜技术的难点之一。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,并且建立了简化后的控制系统模型。在此基础上,完成了控制系统的控制器设计。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。结果表明,单位倾斜误差校正时间为2.6s,分析子镜倾斜的功率谱密度可知,动态倾斜误差校正带宽达到了0.34Hz,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. The model of the active mirror control system for the primary mirror is constructed. By using the static decoupling method, the transfer function matrix is diagonalized. The system is simplified from the multiple-input multiple-output form to the single-input single-output form and a simplified control System model On this basis, the controller design of the control system is completed. 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. The results show that the unit tilt error correction time is 2.6s. The analysis of the power spectrum density of the sub-mirror tilt shows that the dynamic tilt error correction bandwidth reaches 0.34Hz, which realizes the fast correction of the static stitching error and the real-time effective correction of the dynamic error.