Accuracy Analysis on Focus Cabin of FAST

doi:10.3901/JME.2017.17.036

Abstract

Abstract: Focus cabin is used for precise positioning of feeds of the five-hundred meter aperture spherical radio telescope (FAST). According to the control scheme,Stewart platform in the focus cabin is the adjusting mechanism to realize precise positioning of the feeds.Therefore,the accuracy analysis of the focus cabin can be simplified to the accuracy analysis of the Stewart platform.Three kinds influence factors of feeds positioning is proposed based on the real work situation and control scheme of the focus cabin.By analyzing the control accuracy of the six-cable driven parallel robot and the coupling of the focus cabin and the cables,residual control error of the focus cabin is obtained.Considering the low stiffness of the Stewart platform and its structure deformation analysis,positioning accuracy of the focus cabin is studied by using Monte Carlo and interval analysis method based on the control scheme of the Stewart platform.Meanwhile,positioning error of the focus cabin caused by measurement error is given.Therefore, the comprehensive positioning accuracy evaluation value of the focus cabin can be obtained.Setting up a semi-physical simulation model by using the actual focus cabin and a simulation software to simulate actual working conditions and the coupling characteristics of the cables and the focus cabin,experiment results on the semi physical simulation model verify the positioning accuracy of the focus cabin,and provide necessary reference and debugging parameters of the focus cabin in the real work.

Key words: accuracy analysis, radio telescope, semi-physical simulation, Stewart platform

CLC Number:

P111
TP2

YAO Rui, LI Qingwei, SUN Jinghai, SUN Caihong, ZHU Wenbai. Accuracy Analysis on Focus Cabin of FAST[J]. Journal of Mechanical Engineering, 2017, 53(17): 36-42.

References

[1] NAN Rendong. Five hundred meter aperture spherical radio telescope (FAST)[J]. Science in China:Series G Physics, Mechanics & Astronomy, 2006, 49(2):129-148.
[2] ZHU Wenbai, NAN Rendong, REN Gexue. Modeling of a feed support system for FAST[J]. Experimental Astronomy, 2005, 17(1-3):177-184.
[3] TANG Xiaoqiang, ZHU Wenbai, SUN Chaihong, et al. Similarity model of feed support system for FAST[J]. Experimental Astronomy, 2011, 29(3):177-187.
[4] 朱文白. FAST望远镜天文规划和馈源支撑的相关研究[D]. 北京:中国科学院研究生院, 2006. ZHU Wenbai. Study on astronomical planning and feed support system of FAST telescope[D]. Beijing:Graduate University of Chinese Academy of Sciences, 2006.
[5] 黄真,孔令富,方跃法,等. 并联机器人机构学理论及控制[M]. 北京:机械工业出版社, 1997. HUANG Zhen, KONG Lingfu, FANG Yuefa, et al. Theory and control of parallel robot mechanism[M]. Beijing:China Machine Press, 1997.
[6] EF F. A Stewart-platform based manipulator:General theory and practical construction[J]. International Journal of Robotics Research, 1986, 5(2):157-182.
[7] SHAO Zhufeng, TANG Xiaoqiang, CHEN Xu, et al. Research on the inertia matching of the Stewart parallel manipulator[J]. Robotics and Computer Integrated Manufacturing, 2012, 28(6):649-659.
[8] YAO Rui, TANG Xiaoqiang, LI Tiemin, et al. Error analysis and distribution of 6-SPS and 6-PSS reconfigurable parallel manipulators[J]. Tsinghua Science and Technology, 2010, 15:547-554.
[9] 谢平,杜义浩,田培涛,等. 一种并联机器人误差综合补偿方法[J]. 机械工程学报, 2012, 48(9):43-49. XIE Ping, DU Yihao, TIAN Peitao, et al. A parallel robot error comprehensive compensation method[J]. Journal of Mechanical Engineering, 2012, 48(9):43-49.
[10] ZHANG Xinyu, LI Hui, YAO Rui, et al. Free vibration model and experimental study of the FAST cable-driven parallel mechanism[J]. International Journal of Advancements in Computing Technology, 2012, 4(20):310-320.
[11] 李辉,朱文白,潘高峰. FAST望远镜馈源支撑中的力学问题及其研究进展[J]. 力学进展, 2011(2):133-154. LI Hui, ZHU Wenbai, PAN Gaofeng. Mechanics in the feed support of FAST telescope and its research progress[J]. Advances In Mechanics, 2011(2):133-154.
[12] 张新宇. FAST望远镜馈源支撑若干关键问题研究[D]. 北京:中国科学院大学, 2012. ZHANG Xinyu. Study on several key problems of the FAST telescope support system[D]. Beijing:Uninversity of Chinese Academy of Sciences, 2012.
[13] YAO Rui, ZHU Wenbai, HUANG Peng. Accuracy analysis of Stewart platform based on interval analysis method[J]. Chinese Journal of Mechanical Engineering, 2013, 26(1):29-34.

[1]	FENG Shufei, BAN You, LIAN Peiyuan, WANG Wei. Progress and Challenges in the Structural Design of Large Fully-steerable Radio Telescopes [J]. Journal of Mechanical Engineering, 2024, 60(13): 330-344.
[2]	LIU Jianhua, ZHANG Zhiqiang, XIA Huanxiong, GONG Hao, SHAO Nan. Assembly Accuracy Analysis with Consideration of Form Defects and Surface Deformations [J]. Journal of Mechanical Engineering, 2021, 57(3): 207-219.
[3]	NA Qiang, LI Bo, TAO Jianguo, YU Jinshan, FAN Shichao. Centroid Measurement Method and Experimental Study of Multi-configuration Planetary Rover [J]. Journal of Mechanical Engineering, 2019, 55(12): 19-28.
[4]	LI Qingwei, JIANG Peng, NAN Rendong. Design and Analysis of the Adaptive Connecting Mechanism between the Cable-net and Panel of Five-hundred-meter Aperture Spherical Radio Telescope [J]. Journal of Mechanical Engineering, 2017, 53(7): 62-68.
[5]	LI Qingwei, JIANG Peng, NAN Rendong. Initial Gap between Panels of the Reflector of FAST [J]. Journal of Mechanical Engineering, 2017, 53(17): 4-9.
[6]	ZHU Wanxu, DENG Lijiao, HUANG Ying, OU Jinping. Design and Process Control of Cable Length with Millimeter Accuracy of FAST Project [J]. Journal of Mechanical Engineering, 2017, 53(17): 17-22.
[7]	ZHU Wanxu, QIN Heying, LI Juze, OU Jinping. Monitoring Cable Force of FAST Project Based on Fiber Bragg Grating Sensor External Installed on Anchorage Zone [J]. Journal of Mechanical Engineering, 2017, 53(17): 23-30.
[8]	DUAN Qingjuan, YIN Chengxi, DUAN Baoyan. Parameter Optimization of a Feed Structure for 50 m Scaled Model of the Large Spherical Radio Telescope [J]. Journal of Mechanical Engineering, 2017, 53(17): 31-35.
[9]	CHU Zhongyi;MA Jing;LI Dan. Semi-physical Simulation Experiments on Vibration Control of Flexible Space Manipulator [J]. , 2012, 48(21): 8-14.
[10]	YANG Cheng;ZHOU Fuqiang. Structure Design of Binocular Vision Sensor Using Mono-camera with Mirrors [J]. , 2011, 47(22): 7-12.
[11]	LIU Dawei;WANG Liping;GUAN Liwen. Accuracy Analysis and Calibration of a Special 3-DOF Parallel Mechanism [J]. , 2010, 46(9): 46-51.
[12]	LI Hui;ZHU Wenbai;PAN Gaofeng. Design of Linking Mechanisms of Cable into Focus Cabin of Five-hundred-meters Aperture Spherical Radio Telescope and Its Static Analysis [J]. , 2010, 46(7): 7-15.
[13]	WU Bo;SHAO Junpeng;WU Shenglin;ZHAO Keding. Model Parameters Identification Method for Electro-hydraulic Driving Stewart Platform [J]. , 2010, 46(3): 29-34.
[14]	HUANG Peng;WANG Liping;GUAN Liwen;YAO Rui. Kinematic Performance and Accuracy Analysis of New Type 3-DOF Parallel Mechanism [J]. , 2010, 46(15): 1-7.
[15]	GUO Yongwei;WANG Qiming. Theoretic Model and Position Solution of a Cable Mesh Mechanism [J]. , 2010, 46(1): 18-23.