Abstract
Five-hundred-meter aperture spherical radio telescope (FAST) is supported by a cable-net structure, which enables its surface to form a real-time paraboloid by active control. FAST project is currently in the construction and implementation stage. However, there are always a considerable amount of errors that existed in practice which may result in the deviation of the structure from its ideal model or design. Therefore, structural parameter sensitivity analysis was discussed, which is indispensable. However, such deformation operation would lead to about 500 MPa of fatigue stress variation amplitude in the cable-net structure. Optimized deformation strategy is proposed to release the fatigue stress of the cable-net structure, which would be of advantage to improve the reliability of the cable-net structure. In the paper, the variation ranges of structural parameters were rationally determined. Based on local sensitivity analysis and global sensitivity analysis method, finite element model was used to study the effect of different structural parameters on the static behavior. It can be concluded that the effect of several key design parameters such as the cutting length and the elastic modulus of cable on the cable force is significant. The global sensitivity analysis indicates that the cable force range of the cable-net is −19% to 27%.
Highlights
IntroductionFive-hundred-meter aperture spherical radio telescope (FAST) (five-hundred-meter aperture spherical radio telescope) is a major scientific project belonging to the national “11th five-year plan.” Upon completion, it will become the world’s largest telescope, bigger than the 305-meter Arecibo telescope of the United States [1,2,3,4]
Five-hundred-meter aperture spherical radio telescope (FAST) is a major scientific project belonging to the national “11th five-year plan.”
Each of the cable-net nodes is pulled by its down-tie cable driven by an actuator to control the deformation of the cable-net to form different paraboloids of 300 m aperture [3,4,5]
Summary
FAST (five-hundred-meter aperture spherical radio telescope) is a major scientific project belonging to the national “11th five-year plan.” Upon completion, it will become the world’s largest telescope, bigger than the 305-meter Arecibo telescope of the United States [1,2,3,4]. FAST (five-hundred-meter aperture spherical radio telescope) is a major scientific project belonging to the national “11th five-year plan.”. Each of the cable-net nodes is pulled by its down-tie cable driven by an actuator to control the deformation of the cable-net to form different paraboloids of 300 m aperture [3,4,5]. The deformation optimization strategy is of great importance to the decrease of the stress variation amplitude of the cable-net in the observation process, to the safety and reliability of the structure. By extracting the ratio of the actual cable stress to the standard cable stress as a reference to evaluate the cable stress variation, the results are used to evaluate the influence of a variety of errors to the cable-net structure and to provide a reference to the control of the construction process and the design of the actuators
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