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Uncertainty assessment method for measuring rockwell hardness of information lacking material

A technology for measuring uncertainty and Rockwell hardness, which is applied in the field of Rockwell hardness measurement uncertainty evaluation of information-poor materials, and can solve problems such as complexity, unknown probability distribution of measured value sequences, and lack of information

Inactive Publication Date: 2009-08-19
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the evaluation of the measurement uncertainty of the Rockwell hardness of actual materials, since the probability distribution of the measured value sequence is often unknown or very complex, and only small sample measurement data can be used for reference and analysis, this is a problem of lack of information.

Method used

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  • Uncertainty assessment method for measuring rockwell hardness of information lacking material
  • Uncertainty assessment method for measuring rockwell hardness of information lacking material
  • Uncertainty assessment method for measuring rockwell hardness of information lacking material

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Embodiment Construction

[0070] Use TH310 Rockwell hardness machine to measure the Rockwell hardness of cast iron. The indenter type adopts a quenched steel ball with a diameter of 1.588mm, and the total test force is 980.7N. The resulting Rockwell hardness measurements were 100HRB, 101HRB, 102HRB, 99HRB, 99HRB, 100HRB, 98HRB, 100HRB, 99HRB.

[0071] The following is the concrete calculation process of the inventive method

[0072] Such as Figure 4 It can be seen from the frequency distribution diagram that the measured values ​​approximately obey the normal distribution, so the gray coefficient c is 2.5. Calculate the following parameters:

[0073] The present invention is a new method for evaluating the measurement uncertainty of Rockwell hardness of information-poor materials. The specific steps of the method are as follows:

[0074] Step 1: Sort the obtained measurement data in ascending order:

[0075] H b 0 ( ...

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Abstract

The invention relates to a method for evaluating uncertainty of Rockwell hardness measurement of deficiency information material, comprising the five steps of: step 1, carrying out ordering to the obtained measured data in a Rockwell hardness machine according to ascending order; step 2, carrying out first order accumulation to the obtained data after ordered and generating an accumulation curve; step 3, calculating the largest distance value of a reference line obtained by the accumulation of average value of measured data and the accumulation curve generated by the step 2; step 4, marking the results on frequency distribution and judging the obedient data distribution types of the measured data according to a frequency distribution diagram; and step 5, calculating the uncertainty of Rockwell hardness measurement of deficiency information material according to a formula that Mu is equal to c (Delta max / n). The invention mainly applies the grey system theory to carry out uncertainty evaluation to the Rockwell hardness measurement of the material, and the method belongs to the practical engineering application of the nonstatistical principle. The method overcomes the defects of the statistical method in the prior art, and leads the uncertainty evaluation to be more accurate and effective in the engineering measurement, thus having practical value and application prospect.

Description

(1) Technical field [0001] The invention relates to a method for evaluating uncertainty of Rockwell hardness measurement of information-poor materials, belonging to the technical field of engineering measurement. (2) Background technology [0002] Lack of information (poor information) refers to lack of information or serious lack of information. In the research of information science and system science, lack of information system is described as an uncertain system with incomplete information. [0003] The ability of metal materials to resist the indentation of the surface by hard objects is called hardness. According to different test methods and scope of application, hardness can be divided into Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness. Material Rockwell hardness test is to express the hardness of metal materials by measuring the indentation depth. [0004] Uncertainty is an inherent attribute of evaluation measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/44G06N1/00G06N99/00
Inventor 王中宇葛乐矣佟杰
Owner BEIHANG UNIV
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