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FAST(Five-hundred-meter Aperture Spherical Telescope)是一个500m直径的巨型大跨度空间结构。通过促动器拖动下拉索来控制主索节点的位置,实现望远镜主动变位,其实质是一种特殊、长期、高应力幅的往复疲劳荷载。在30年的运行期间内,预计总共有至少数十万次的观测,主索网的疲劳应力幅为470MPa。基于以上思想并结合FAST的功能要求和特点,对FAST主动反射面整体支承结构的索网进行了完整系统的疲劳统计分析。
FAST (Five-hundred-meter Aperture Spherical Telescope) is a 500 m diameter giant long-span space structure. Dragging the pull-down cable through the actuator controls the position of the main cable node and realizes active displacement of the telescope. The essence is a special, long-term and high-stress reciprocating fatigue load. During the 30 years of operation, a total of at least hundreds of thousands of observations are expected, with a fatigue stress of 470 MPa on the main ropeway. Based on the above ideas and combined with the functional requirements and features of FAST, a complete and systematic fatigue statistical analysis of the cable network of the FAST active reflecting surface monolithic support structure was carried out.