高准确度微小扭矩标准装置研究

Research on High Accuracy Torque Standard Machine

介绍了中国计量科学研究院新研制的基于空气轴承支撑技术的1 mN·m^1 N·m微小扭矩标准装置的工作原理、机械结构、性能试验和不确定度评定。该装置采用静压空气轴承作为力臂杠杆的支撑部件;力臂杠杆系统采用单臂结构,并配备了配平机构和力臂限位保护机构;砝码加载机构采用砝码吊挂、砝码组和砝码支撑系统精密结合的方式。理论分析和性能试验表明:该装置的相对扩展不确定度(k=2)在1~5 mN·m范围内小于3.4×10^(-4);在5~100 mN·m范围内小于7.4×10-5;在100 mN·m^1 N·m范围小于2.6×10^(-5)。

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.