Abstract A set of high accuracy 20kN·m torque standard machine based on air bearing technology was newly developed at National Institute of Metrology (NIM). The static air bearing is adopted to support the arm lever at the fulcrum, a multi-part frame structure is used in the arm system, the arm is made of Invar alloy material with a low thermal expansion coefficient. A combination of multiple weight groups, rotating platform and lifting mechanisms is adopted in the weight loading system which can realize the measurement of torque values in different ranges without reverse loading. The working principle and mechanical structure of the machine are introduced, the results of performance test and uncertainty assessment are described. The theoretical analysis and performance tests show that the repeatability is smaller than 2×10-5, the uncertainty is less than 2×10-5(k=2) in the range from 100N·m to 24kN·m.
ZHANG Zhi-min,ZHANG Yue,MENG Feng, et al. Research on High Accuracy Large Torque Standard Machine Based on Air Bearing Technology[J]. Acta Metrologica Sinica, 2021, 42(3): 271-275.
［1］Zhang Z M, Zhang Y, Meng F, et al. Establishment of 20 kN·m Torque Standard Machine at NIM ［C］//IMEKO 23rd TC3, 13th TC5 and 4th TC22 International Conference. Helsinki, Finland, 2017.
［2］Zhang Z M, Zhang Y, Li T, et al. The Design of 20kN·m Torque Standard Machine at NIM［C］//IMEKO XXI World Congress. Czech, Portugal, 2015.
［3］张智敏, 李涛, 张跃, 等. 高准确度微小扭矩标准装置研究［J］. 计量学报, 2018, 39(2): 155-158.
Zhang Z M, Li T, Zhang Y, et al. Research on High Accuracy Small Torque Standard Machine［J］. Acta Metrologica Sinica, 2018, 39(2): 155-158.
［4］Zhang Z M, Zhang Y, Meng F, et al. The establishment of a 1N·m torque standard machine at NIM［J］. Act Aimeko, 2017, 6(2): 50-53.
［5］Peschel D, Mauersberger D. Determination of the Friction of Aerostatic Radial Bearing for the Lever-Mass System of Torque Standard Machines［C］//Proceedings of the 13th IMEKO World Congress, Torino, Italy, 1994.
［6］蔡学熙. 现代机械设计方法实用手册［M］. 北京: 化学工业出版社, 2004, 343-380.
［7］刘江. 低膨胀合金的应用和发展［J］. 金属功能材料, 2007, 14(5): 33-37.
Liu J. Application and development of low expansion alloys［J］. Metal Functional Materials, 2007, 14(5): 33-37.
［8］张智敏, 李涛, 张跃, 等. 全自动高准确度100N·m扭矩标准机［J］. 计量学报, 2010, 31(1): 1-4.
Zhang Z M, Li T, Zhang Y, et al. A Full-automatic High Accuracy 100 Nm Torque Standard Machine［J］. Acta Metrologica Sinica, 2010, 31(1): 1-4.
2021, Vol. 42 
