Prototype Experiment on Damping Identification of the Cabin-cable Suspension System of FAST

doi:10.3901/JME.2023.13.001

Abstract

Abstract: In the conceptual design of the feed support system of Five-hundred-meter Aperture Spherical radio Telescope (FAST), the feed cabin is driven by 6 parallel flexible steel cables so that the telescope can be roughly aligned to object radio source and follows its track. The cabin and the 6 cables then comprise in dynamics of a huge flexible cabin-cable suspension system with a span of 600 m. Its damping performance is a very important influence factor on the final pointing and tracking accuracy of FAST. A set of prototype tests to identify its damping ratios just after the cabin-cable suspension system is built. First, 4 typical cabin positions are selected respectively for vibration tests according to the movement range of the cabin. Then several acceleration-time curves relating to different points on the cabin are measured as the main test data. Finally Ibrahim time domain (ITD) method is used to identify natural frequency and damping ratio from the data. The test results prove that damping ratio of the prototype is not lower than 0.003 5, with higher potential energy dissipation and control stability than the previous scaled models, which provides important reference for the control algorithm and commissioning of FAST.

Key words: FAST, cabin-cable suspension system, dynamics, prototype test, damping identification

CLC Number:

TG156

LI Hui, TANG Wei, SUN Caihong. Prototype Experiment on Damping Identification of the Cabin-cable Suspension System of FAST[J]. Journal of Mechanical Engineering, 2023, 59(13): 1-10.

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