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| Research on High Accuracy Torque Standard Machine |
| ZHANG Zhi-min1,LI Tao2,ZHANG Yue1,MENG Feng1,JI Hong-lei2,ZHANG Wei1,HU Gang1 |
1. National Institute of Metrology, Beijing 100029, China
2. Shanghai Marine Equipment Research Institute, Shanghai 200031, China |
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Abstract A set of high accuracy 1mN·m～1N·m torque standard machine was newly developed at National Institute of Metrology (NIM). A static air bearing is used to support an arm lever at a fulcrum, a single beam structure is adopted in the arm lever which is equipped with a balancing beam and a overload protection part, an unique weight loading system is designed and manufactured by using precise combination of load frame, groups of weights and weight supporting part. 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 the expanded uncertainty(k=2) of the machine is less than 3.4×10-4 from 1mN·m to 5mN·m, 7.4×10-5 from 5mN·m to 100mN·m, 2.6×10-5 from 100mN·m to 1N·m.
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Received: 28 March 2016
Published: 11 February 2018
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Corresponding Authors:
ZHANG Zhimin
E-mail: zhiminzhang@nim.ac.cn
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2018, Vol. 39 
