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国家天文台500m口径球面射电望远镜FAST主动反射面基准面是一个口径500m、半径300m的球面,由主体支承结构、促动器、反射面单元组成.本文从反射面单元工装定位、螺栓紧固控制、拼装精度控制、测量技术等重点着手,深入分析解决了铝合金背架拼装难点,总结研发了小拼单元面形数字化(智能化)摄影高精度拼装方法.本工程摄影测量自动化、智能化的高效应用成功解决了反射面单元高精度拼装快速测量的难题,确保了FAST项目能够顺利完成实施,也可为同类大型钢结构建筑的施工提供参考.
The National Astronomical Observatory 500m Spherical Radio Telescope The FAST active reflective surface is a spherical with a diameter of 500m and a radius of 300m, which is composed of the main support structure, actuators and reflector units.In this paper, from the reflector unit fixture positioning, bolt fastening control, Assembly precision control, measurement technology and other key start, in-depth analysis and solve the difficulty of aluminum alloy backshell assembly, summed up the development of a small fight unit shape digital (intelligent) photography assembly method of high precision. The engineering photogrammetric automation, intelligent and efficient The application successfully solved the problem of rapid measurement of high-precision assembly of reflector units, ensured the successful implementation of FAST project, and provided references for the construction of similar large-scale steel structures.