500 m口径球面射电望远镜（five-hundred-meter aperture spherical radio telescope，FAST）反射面单元具有类型多、精度高、构件量大、结构复杂和维护难等特点。为解决反射面单元质量评估及高效维护技术难题，该文引入单元构件参数因子，创建了单元空间数学模型，开发了单元质量评估算法，得到所有反射面单元质量。结果表明：三角形单元共187种、4 300块，质量分布区间为427.34～480.69 kg，质量之和为1 952.67 t；四边形单元共15种、150块，质量分布区间为379.74～974.58 kg，质量之和为99.32 t。该文开发的创新性的、全覆盖反射面的500 m全跨径缆索维护系统，突破了复杂边界及高效维护反射面的关键技术难题，完成了多块单元受损后替换、靶标更新及节点盘除锈补涂等高效维护工作。该成果对于评估FAST反射面单元总质量，突破反射面维护技术方法及保证正常运行具有重要意义。
Abstract
Reflector unit of five-hundred-meter aperture spherical radio telescope (FAST) has many characteristics, such as many types, high precision, large number of components, complex structure and difficult to maintain. In order to solve the technical problems of reflector unit quality evaluation and efficient maintenance, this paper introduced the reflector unit component parameter factor, created the reflector unit pace mathematical model, developed the reflector unit mass evaluation algorithm, and obtained the element mass of all reflectors. The results show that there are 4 300 pieces of 187 types of triangular reflector units, the mass distribution range is 427.34~480.69 kg, and the sum of the mass is 1 952.67 t. There are 150 quadrilateral reflector units of 15 types, the mass distribution range is 379.74~974.58 kg, and the sum of the masses is 99.32 t. An innovative cable maintenance system of 500 m full span with full coverage of reflector has been developed. The key technical problems of complex boundary and efficient maintenance of reflector have been solved. High efficiency maintenance work such as replacement of damaged units, target update and node disk rust removal and coating has been completed. This achievement has great significance for evaluating the total mass of FAST reflector units, improving the reflector maintenance technology and methods, and ensuring its normal operation.
关键词
FAST /
反射面单元 /
质量算法 /
维护技术
Key words
FAST /
reflector unit /
mass algorithm /
maintenance technology
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基金
国家自然科学基金面上项目（11173035）
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