The reflecting surface of the five-hundred-meter aperture spherical radio telescope (FAST) is supported on a cable-net structure with the active shape changing of the reflecting surface relying on hydraulic actuators to adjust the tie-down cable lengths. The hydraulic actuator linkage control is then a complex multiple degree-of-freedom coupled system. In this paper, a quasi-real-time evaluation system for the FAST cable-net operation is developed. According to the FAST operating characteristics, the system was developed using MATLAB and ANSYS based on mechanical simulation technology. The system included a model processing module, pre-operation analysis module, and quasi-real-time tracking analysis module, which can calculate the face cable stresses, face cable stress amplitudes, tie-down cable forces, and the nodal radial displacement deviations during the cable network operation. The system can also provide monitoring and early fault warnings. The system effectiveness was verified by installing the system on the FAST facility with tests for actual working conditions. The system simplifies the operations and analyses, improves the analysis efficiency, reduces the safety risk in case of actuator failure, and ensures safe operation of the FAST cable network.
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