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| The Moment-arm System of 1mN·m to 1 N·m Torque Standard Machine |
| ZHANG Zhimin1,LI Tao2,ZHANG Yue1,JI Honglei2,3,MENG Feng1 |
1.National Institute of Metrology, Beijing 100029, China
2.Shanghai Marine Equipment Research Institute, Shanghai 200031, China |
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Abstract A high accuracy 1 mN·m to 1 N·m torque standard machine is newly developed at National Institute of Metrology (NIM). For 1 N·m torque standard machine, the moment-arm system is the key component of the machine, the structure and material of moment-arm concern the accuracy of moment-arm length and affect the technical performance of the machine. The structure design, the material selection and the manufacture and measurement of the moment-arm are introduced, the automatic limit protection component and the software emulation on stress and deformation of the moment-arm are described. The uncertainty of the moment-arm length is evaluated to be 4.2×10-6(k=2), the moment-arm fully meets the requirements of technical performance of 1 N·m torque standard machine.
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Received: 28 January 2014
Published: 27 January 2016
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Corresponding Authors:
ZHANG Zhimin
E-mail: zhiminzhang@nim.ac.cn
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2016, Vol. 37 
