基于均值平移的动态测量重复性的评定方法研究

Assessing the repeatability of dynamic measurement based on mean line

对动态测量重复性的常规评定方法进行了深入分析,指出了其局限;提出了评定动态测量重复性的新方法———均值平移法。理论分析对比与实际测量数据的计算都表明,均值平移法客观地从整体上反映了动态测量重复性。同时,对动态测量重复性与动态测量中指标量的测量重复性进行了辨析。所述方法在精密仪器验收、各种检测规程的制订和动态测量误差的处理中都有实用价值,也适用于动态测量的再现性评定。

The measurement repeatability is a critical specification in precision measurement. The assessment method for the repeatability of static measurement is clear and definite based on all kinds of technical codes such as ISO, GB, and so on, but the assessment method for the repeatability of dynamic measurement (RDM) is unclear and equivocal. With the equipment for dynamic measurement being employed more and more, how to assess RDM becomes a sophisticated problem. After reviewing the prevailing assessment method of RDM and identifying its limitations, the paper proposes a novel method for assessing RDM, which is based on the mean line of measurement data. The theoretic analysis of the new method and the comparison between the prevailing method and the new method are conducted. Furthermore, the examples of the computation of practical measuring data are given by means of the abovementioned methods. It is indicated, by the theoretic analysis and the computation, that new method can objectively reflect the dynamic measurement error in general. Finally, RDM and the repeatability of the characterized item in dynamic measurement are clarified. The new method is utilized to accept the new measuring instruments, and verified by measurement data. It is also applied to the assessment of measurement reproducibility.