Reliability Growth of FAST Actuator

doi:10.3901/JME.2025.03.251

Abstract

Abstract: The FAST observation efficiency was affected seriously by the low reliability of the actuator. To solve the problem, the actuator reliability growth scheme which included the self-purification function, drive system, environmental protection and condition monitoring is proposed. And the accelerated reliability growth test method for multiple items asynchronous corrective actions of actuator is designed. According to the reliability analysis, the mean time between failures (MTBF) predicted value of the reliability growth scheme for actuator is 81 536 h, and the value is more than 12 times that of in 2019. Three prototypes are used for the reliability growth test, and the accelerated reliability growth testing method which tracking and reciprocating continuous alternating working mode and increase the load scheme are designed. The test lasted from May 2019 to August 2022, and prototypes are failure-free working except for 3# had three times B failure. The reliability test is finished with the time truncation mode. And the test data is analyzed by the AMSAA model, and the test predicted result of MTBF is 80 061 h. The MTBF results of design and test agree with each other well, and the effectively of actuator reliability growth solution is proved. Perform statistical analysis on the one-year working data after completing all upgrades. And the average failure rate of the actuators in last year is 0.35 units a day, and the failure rate has been decreased by 12.2 times. This numerical values are consistent with the theoretical analysis and test results, and the effectiveness of the reliability growth scheme and the reliability accelerated test method is supported again. FAST actuator reliability growth has been achieved greatly by the research method of synthesizes the theoretical analysis, experimental verification and engineering practice, and the reliability of the actuator group system has increased by an order of magnitude, which can provide reference for other similar studies.

Key words: actuators of FAST, reliability growth, AMSAA model, group system

CLC Number:

TH137

LEI Zheng, JIANG Peng, YAO Rui, WANG Yong. Reliability Growth of FAST Actuator[J]. Journal of Mechanical Engineering, 2025, 61(3): 251-258.

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] 李庆伟，姜鹏，南仁东. 500m口径射电望远镜索网与面板单元自适应连接机构设计分析[J]. 机械工程学报，2017，53(7):62-68. 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.
[3] 沈宇洲，罗斌，谢国瑞，等. FAST反射面索网支承结构误差敏感性分析和多误差耦合分析[J]. 机械工程学报，2017，53(17):10-16. SHEN Yuzhou，LUO Bin，XIE Guorui，et al. Error sensitivity analysis and multiple error coupling analysis of fast cable-net supporting structure[J]. Journal of Mechanical Engineering，2017，53(17):10-16.
[4] 王启明，高原，朱明，等. 500米口径球面射电望远镜反射面液压促动器关键性能分析[J]. 机械工程学报，2017，53(2):183-191 WANG Qiming，GAO Yuan，ZHU Ming，et al. Key performance analysis of five-hundred-meter aperture spherical radio telescope reflective surface hydraulic actuator[J]. Journal of Mechanical Engineering，2017，53(2):183-191.
[5] 雷政，姜鹏，王启明，等. FAST促动器群系统可靠性研究[J]. 机械工程学报，2022，58(6):289-294. LEI Zheng，JIANG Peng，WANG Qiming，et al. Study of the reliability of actuator group system for FAST[J]. Journal of Mechanical Engineering，2022，58(6):289-294.
[5] 张鹏，宋文琦，肖博文，等. 天然气管道可靠性增长预测方法研究[J]. 中国安全生产科学技术，2024，20(1):114-120. ZHANG Peng，SONG Wenqi，XIAO Bowen，et al. Research on prediction method for reliability growth of natural gas pipeline[J]. Journal of Safety Science and Technology，2024，20(1):114-120.
[7] 雷政，王启明，甘恒谦，等. FAST液压促动器过滤系统[J]. 机械工程学报，2020，56(4):218-223. LEI Zheng，WANG Qiming，GAN Hengqian，et al. Filtration system for hydraulic actuators of FAST[J]. Journal of Mechanical Engineering，2020，56(4):218-223.
[8] 赵静一，朱明，王启明，等. FAST液压促动器液压系统管路可靠性增长试验研究[J]. 机械工程学报，2019，55(16):197-204. ZHAO Jingyi，ZHU Ming，WANG Qiming，et al. Reliability growth test study of five-hundred-meter aperture spherical radio telescope reflective surface hydraulic actuator[J]. Journal of Mechanical Engineering，2019，55(16):197-204.
[9] 封艳秋. 液压污染控制技术的现状和发展[J]. 煤矿机械，2011，23(1):1-3 FENG Yanqiu. Situation and development on technology of hydraulic contamination control[J]. Coal Mine Machinery，2011，23(1):1-3
[10] 周燕，邓季贤，赵黎明，等. 提高活塞杆铬层防腐性能的封孔技术[J]. 液压气动与密封，2018，38(11):82-85. ZHOU Yan，DENG Jixian，ZHAO Liming，et al. The surface sealing technology for improving piston rod collateral corrosion resistance performance[J]. Hydraulics Pneumatics & Seals，2018，38(11):82-85.
[11] 申小雪，胡启国，刘博文. 某两栖装甲车液压系统的可靠性研究[J]. 农业装备与车辆工程，2015，53(8):52-56. SHEN Xiaoxue，Hu Qiguo，LIU Bowen. Reliability study on hydraulic system of amphibious armored vehicles[J]. Agricultural Equipment& Vehicle Engineering，2015，53(8):52-56.
[12] 于建华. 掘进机液压系统的可靠性建模与分析[J]. 煤矿机械，2015，36(5):111-113. YU Jianhua. Modeling and analysis on reliability of roadheader hydraulic system[J]. Coal Mine Machinery，2015，36(5):111-113.
[13] 赵静一，姚成玉. 液压系统可靠性工程[M]. 北京:机械工业出版社，2011. ZHAO Jingyi，YAO Chengyu. Reliability engineering of hydraulic system[M]. Beijing:China Machine Press，2011.
[14] 梅文华. 可靠性增长试验[M]. 北京:国防工业出版社，2003. MEI Wenhua. Reliability growth test[M]. Beijing:National Defense Industry Press，2003.