Metrology-based R-test calibration uncertainty evaluation method

A standard uncertainty and certainty technology, applied in computer control, design optimization/simulation, program control, etc., can solve problems such as calibration uncertainty evaluation, and achieve the effect of avoiding complex calculation processes

Active Publication Date: 2021-06-25
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0004] Considering the complexity of the contact R-test calibration nonlinear model, the traditional uncertainty guide or MCM method alone cannot accurately evaluate the calibration uncertainty. Therefore, based on the existing uncertainty evaluation methods, the proposed An accurate evaluation method suitable for contact R-test calibration uncertainty is very necessary

Method used

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Embodiment Construction

[0055] Below in conjunction with example and accompanying drawing, the present invention will be further described:

[0056] Based on the contact R-test structure (such as figure 1 Shown) and measurement principle, the present invention combines the contact type R-test calibration uncertainty evaluation method of GUM and MCM, and its evaluation flow chart is as figure 2As shown, it specifically includes the following technical steps:

[0057] Step 1: Analyze the influencing factors of the calibration method and calculate its standard uncertainty;

[0058] When evaluating the calibration uncertainty of the contact R-test, the evaluation model is as follows:

[0059]

[0060] Among them, (x, y, z) are the coordinates of the center of the measuring sphere, (x i_1 ,y i_1 ,z i_1 ) is the sensor position coordinates, l i are the readings of the three sensors, R is the radius of the measuring sphere, and r is the radius of the sensor detecting sphere.

[0061] The calculat...

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Abstract

The invention discloses a metrology-based R-test calibration uncertainty evaluation method, which comprises the following steps: firstly, aiming at a contact type R-test calibration process, on the basis of a measurement model and a measurement principle of the contact type R-test calibration process, analyzing various influence factors and corresponding standard uncertainty, and calculating by adopting a variable parameter method to obtain a sensitivity coefficient; then, using the GUM for calculating the position coordinate uncertainty component of the sensor, and finally, achieving final calibration uncertainty evaluation based on the MCM. According to the method, an original evaluation method is improved based on the contact R-test calibration principle, so that the purpose of improving the calibration evaluation precision is achieved, and the method is widely applied to various contact R-tests.

Description

technical field [0001] The invention belongs to the field of measuring accuracy evaluation of a numerically controlled machine tool error measuring device, and in particular relates to a metrology-based R-test calibration uncertainty evaluation method. Background technique [0002] The evaluation of the calibration uncertainty of the contact R-test is the process of evaluating the calibration accuracy of the contact R-test when it is calibrated on the machine tool before using the contact R-test to measure the error of the machine tool. [0003] Uncertainty of Measurement (Uncertainty of Measurement) characterizes the dispersion of the value that is reasonably assigned to the measured value, and is a parameter associated with the measurement result. The greater the measurement uncertainty, the worse the measurement ability; otherwise, the stronger the measurement ability. According to different methods of propagating uncertainty, contact R-test calibration uncertainty asses...

Claims

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Application Information

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IPC IPC(8): G05B19/401G06F30/17G06F30/20
CPCG05B19/401G06F30/17G06F30/20
Inventor 江磊丁国富周永兵马术文张剑梁红琴
Owner SOUTHWEST JIAOTONG UNIV
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