Evaluation method for measurement uncertainty introduced by mechanism errors of three-coordinate measuring machine

Abstract

The invention discloses an evaluation method for measurement uncertainty introduced by mechanism errors of a three-coordinate measuring machine. The three-coordinate measuring machine has a complex mechanical structure and multiple error sources, and the errors of the mechanical structure have the greatest influence on the uncertainty of space points and are difficult to be quantified. The measurement error model of the space points is obtained under the quasi-rigid body model of the three-coordinate measuring machine. 21 error information caused by the mechanical structure of the three-coordinate measuring machine is obtained through a calibration experiment or a calibration certificate, the distribution type is determined, and then the measurement uncertainty introduced by the mechanism errors of the three-coordinate measuring machine is evaluated through combination of the mechanism error model of the space points by utilizing a monte carlo random sampling method. The measurement uncertainty of the space points evaluated by the evaluation method for the measurement uncertainty has the characteristics of repeatability, reproducibility and stability so that the influence of 21 mechanism errors of the three-coordinate measuring machine on the measurement result is objectively reflected.

Description

technical field [0001] The invention relates to the field of error evaluation methods of a three-coordinate measuring machine, in particular to a measurement uncertainty evaluation method introduced by a mechanism error of a three-coordinate measuring machine. Background technique [0002] Measurement uncertainty is a non-negative parameter that characterizes the scatter given to the measurand. A complete and meaningful measurement result should include the estimation of the measured value and the dispersion parameter. The usability of a measurement result largely depends on the magnitude of its measurement uncertainty. With the rapid development of science and technology, in order to meet higher industrial requirements, the accuracy and reliability of measurement data is becoming more and more important. To improve the accuracy of precision measurement, it is necessary to analyze the factors affecting the measurement results from multiple angles, and adopt the correct The...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a measurement uncertainty evaluation method introduced by the mechanism error of a three-coordinate measuring machine, objectively reflect the influence of 21 mechanism errors of the three-coordinate measuring machine on the measurement results, and solve the problem of the measurement uncertainty of the three-coordinate measuring machine The problem that some evaluation methods cannot calculate the uncertainty components of spatial points

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