1.School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
2.Aviation Key Laboratory of Science and Technology on Aero-Engine Altitude Simulation, China Gas Turbine Establishment, Jiangyou, Sichuan 621703, China
Abstract:Based on geometrical product specification (GPS) and verification, the main sources of task-oriented measurement uncertainty of coordinate measuring machine (CMM) are analyzed. The definition and characteristics of reproducibility, which is one of CMM quantum property factors, are specially discussed. For the measurement task of CMM, the main factors that might cause measurement reproducibility are proposed, the experimental procedure to evaluate reproducibility value is studied, and the mathematical model for reproducibility evaluation is established. Furthermore, the approach to evaluate task-oriented measurement uncertainty of CMM is provided through an example of circle diameter measurement. The results of the example analysis show that the uncertainty component caused by reproducibility is up to 2.5μm when the combined standard uncertainty of circle diameter measurement is determined to be 3.2μm, and it is accounted for the highest proportion of the result uncertainty.
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