超大量程力传递系统不确定度评定研究

近年来,随着超大力值计量的发展,超大量程力传递系统成为力值计量领域研究的热点。提出了一个考虑叠加结构影响的超大量程叠加系统不确定度计算模型,并对一台60 MN叠加系统进行了校准和不确定度评定验证。研究结果表明,叠加结构变形会使叠加系统产生示值误差,而由此引入的不确定度分量明显大于由力传感器引入的不确定度分量。该分量是超大量程叠加系统合成不确定度的重要组成,在评定时,应该充分考虑该分量的影响;叠加系统示值误差及其不确定度外推到满量程时,宜采用幂函数进行曲线拟合并外推,以保证外推结果准确可靠。

Study on uncertainty evaluation of force transfer system with a super large range

With the development of force metrology within super large range,force transfer system with a super large range has become a hotspot in the field of force metrology recent years. An uncertainty calculation model of the build up system with a super large rangeconsidering the influence of the build up structure was developed. A 60 MN build up system was calibrated and its uncertainty was evaluated and verified. The researchresultsshow that the deformation of the build up structure would induce indication error in the build up system. The uncertainty component induced by the indication error is larger than that induced by the force transducer,whichis the main component in the combined uncertainty of build up system with a super large range. In the evaluation, the influence of this component should be fully considered; when extrapolating the indication error and its uncertainty to full range, the power function should be used to perform the curve fitting and extrapolation of the build up system indication error and its uncertainty, which will guarantee thatthe extrapolation results are accurate and reliable.