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| Research on High Accuracy Large Torque Standard Machine Based on Air Bearing Technology |
| ZHANG Zhi-min,ZHANG Yue,MENG Feng,JIANG Ji-le,HU Gang,ZHANG Wei |
| National Institute of Metrology, Beijing 100029, China |
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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.
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Received: 22 August 2019
Published: 23 March 2021
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2021, Vol. 42 
