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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (4): 423271-423271.doi: 10.7527/S1000-6893.2019.23271

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Errors analysis of a subreflector adjustment mechanism for NSRT

GULJAINA Kazezkhan1,2, XIANG Binbin1, WANG Na1, AILI Yusup1, CHEN Maozheng1, LI Ning1,2, XUE Fei1   

  1. 1. Xinjiang Astronomical Observatory, Chinese Academic of Sciences, Urumqi 830011, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-07-05 Revised:2019-11-01 Online:2020-04-15 Published:2019-10-31
  • Supported by:
    National Basic Research Program of China (2015CB857100); Light of West China (2017-XBQNXZ-B-021); National Natural Science Foundation of China (11803078)

Abstract: The Nan Shan 26 m Radio Telescope (NSRT) in Urumqi, Xinjiang, uses the Stewart platform to adjust the position of subreflector in five degrees of freedom. In order to ensure the Stewart platform has high accuracy to meet the high-precision operation requirements of radio telescope, this paper analyzes the errors that affect the accuracy of the Stewart platform. Geometric error simulation results show that in order to achieve the required accuracy, the errors of the leg length and universal joint should be less than 0.08 mm and 0.04 mm. The comparative analysis of the measured data and the simulated data show that the homing error is the main cause of the error of the Stewart platform. Since the homing detection device of the Stewart platform is mainly composed of incremental encoder and limit switch, the abnormal feedback signal of the limit switch will cause the homing error of the Stewart platform. The paper concludes that this factor is the main reason for the working deviation of the Stewart platform for NSRT, which has guiding significance for the error compensation of the Stewart platform.

Key words: radio telescope, adjusting of subreflector, Stewart platform, error analysis, precision

CLC Number: