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研究了世界最大单口径射电望远镜FAST支承结构健康监测系统的安全预警功能。结合监测内容和预警分级原则制订了预警设置的总体框架,根据设计规范和环境荷载记录资料设置环境荷载预警参数,以构件安全和望远镜工作精度为控制目标,确定结构响应预警参数设置依据,提出单点张拉法对节点位移预警参数进行研究,运用LABVIEW平台开发了FAST支承结构健康监测安全预警系统,实现了预警参数嵌入及可视化控制的目标。最终在直径30m的FAST模型索网变位试验中的成功应用表明,该安全预警系统实现了FAST支承结构健康监测在线预警功能,可为将来FAST支承结构建造和正常运行提供重要保障。
The safety warning function of the FAST support structure health monitoring system of the largest single-aperture radio telescope in the world was studied. Combined with the content of monitoring and pre-alarm classification principle, the overall framework of early warning setting was established. According to the design code and environmental load record data, the environmental load pre-warning parameters were set, and the component safety and working precision of telescope were taken as control targets. Point Tension method to study the node displacement early warning parameters, the use of LABVIEW platform developed FAST support structure health monitoring and early warning system to achieve early warning parameters embedded and visual control objectives. The successful application of the FAST model cable network displacement test with a diameter of 30m finally shows that the safety early warning system realizes the online early warning function of the FAST support structure health monitoring and can provide an important guarantee for the construction and normal operation of the FAST support structure in the future.