Deformation strategy on a special cable-net structure of the active reflector system of FAST

Hui Li

doi:10.1117/12.3026294

29 August 2024 Deformation strategy on a special cable-net structure of the active reflector system of FAST

Hui Li

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131005D (2024) https://doi.org/10.1117/12.3026294
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

A unique large-span cable-net structure, as the key unit of the active reflector system of FAST, is specially introduced. The cable-net structure contains a huge cable mesh and thousands of down-tied cables driven by hydraulic actuators. The mesh is normally prestressed to form a 500m-aperture base sphere, but some part may further change its shape to form paraboloid for the purpose of good illumination during FAST works. Such shape change or deformation requires that hundreds of hydraulic actuators drive coordinately. Therefore deformation strategy is necessary to be discussed in details on how much each actuator should stretch out or draw back to paraboloid. Its simulation based on finite element method is further given for demonstration. The regular strategy works well if the illumination area can be limited within the cable mesh. Otherwise, it may induce such structural dangers as slack cable, over-stressed cable or fatigue failure. A new strategy is then developed to crack such problem. It first follows the regular strategy, then checks and finds out all the potentially dangerous cables. The stresses of these dangerous cables are controlled in the safe range via adjusting the related down-tied cables. A comparative simulation result with the measurement on site verifies its effectiveness.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hui Li "Deformation strategy on a special cable-net structure of the active reflector system of FAST", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131005D (29 August 2024); https://doi.org/10.1117/12.3026294

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