Error Sensitivity Analysis and Multiple Error Coupling Analysis of FAST Cable-net Supporting Structure

doi:10.3901/JME.2017.17.010

Abstract

Abstract: The five-hundred-meter aperture spherical radio telescope (FAST) is supported by cable net, which enables the antenna surface to carry out displacement observation through the actuators connected to the cables. The production and installation accuracy of FAST cable-net supporting structure is quite high. In order to determine sensitivity degree and control index of the errors, the independent error analysis and multiple error coupling analysis are carried out for the cable-length error, the active-cable tension error and the outer-node coordinate error, based on the random error analysis method of normal distribution. The analysis results show that the errors of the cable-length and the outer-node coordinate are the main influencing factors of the cable force. The coupling effect of multiple errors is not linear superposition of independent error effects, and the main errors' coupling should be taken into account to determine the control index. The limit of the main-cable length error and radial-cable length error are ±1.5 mm and ±20 mm, while the active-cable tension limit is ±5% and the outer-node coordinate error is ±50 mm, which is provided for the control of the construction quality of FAST cable net.

Key words: cable-net supporting structure, error, FAST project, sensitivity analysis

CLC Number:

TU311

SHEN Yuzhou, LUO Bin, XIE Guorui, GUO Zhengxing, JIANG Peng. Error Sensitivity Analysis and Multiple Error Coupling Analysis of FAST Cable-net Supporting Structure[J]. Journal of Mechanical Engineering, 2017, 53(17): 10-16.

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