Heat-resistant steel aging grade measurement method based on support vector machine

A technology of support vector machine and aging level, used in thermal excitation analysis, material excitation analysis, etc., can solve problems such as safety hazards, and achieve the effects of high accuracy, short calculation time, excellent robustness and adaptability

Active Publication Date: 2018-05-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

For high-temperature heating surfaces, when defects appear, there is a huge potential safety hazard

Method used

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  • Heat-resistant steel aging grade measurement method based on support vector machine
  • Heat-resistant steel aging grade measurement method based on support vector machine
  • Heat-resistant steel aging grade measurement method based on support vector machine

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Embodiment Construction

[0042] The purpose of the invention of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the embodiments cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following embodiments.

[0043] Take T91 heat-resistant steel as an example.

[0044] like figure 1 As shown, a method for measuring the aging grade of heat-resistant steel based on support vector machine, including steps:

[0045] (1) First select the standard T91 heat-resistant steel samples of aging grades 1-5, and use the laser spectrum analysis system to obtain the plasma spectra of the heat-resistant steel samples of different aging grades by means of dot matrix measurement;

[0046] (2) Select and calculate characteristic intensity variables from the plasma spectral data to form a spectral data matrix;

[0047] (3) The spectral data matrix is ​​transformed and pr...

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Abstract

The invention discloses a heat-resistant steel aging grade measurement method based on a support vector machine. The method comprises the following steps: (1) using a laser spectrum analysis system torespectively obtain the plasma spectra of heat-resistant steel samples with different aging grades by means of lattice measurement; (2) selecting and calculating characteristic intensity variables from the plasma spectral data to form a spectral data matrix (3) projecting the spectral data matrix to a high-order feature space by means of kernel function transformation; (4) constructing a calibration and classification model by using a support vector machine algorithm; (5) using a laser spectrum analysis system to measure the plasma luminescence spectrum of the heat-resistant steel sample to be measured, and inputting the spectral data matrix into the calibration and classification model to obtain the aging grade of the sample to be measured. The heat-resistant steel aging grade measurement method is short in operation time consumption and can meet the requirements of real-time measurement of an industrial field; the heat-resistant steel aging grade measurement method has excellent robustness and adaptability to the metallographic inhomogeneity of steel, and can accurately measure the aging grade of a measured object without needing of arranging complex and excessive measurement points for the measured object.

Description

technical field [0001] The invention relates to an on-site rapid analysis method for the aging grade of heat-resistant steel, in particular to a rapid analysis method for the aging grade of heat-resistant steel based on laser-induced breakdown spectrum combined with support vector machine algorithm. Background technique [0002] Key large-scale thermal equipment in industries such as electric power, metallurgy, chemical industry, and machinery need to serve in high-temperature and high-pressure environments. With the increase of service time, the metal properties of heat-resistant steel parts in thermal equipment will change, and gradually Aging and damage, resulting in cracks and internal injuries, greatly increase the probability of equipment failure and accidents, which is directly related to the safety and efficiency of the entire production process. Therefore, the aging grade of metal is an important index for evaluating equipment operation. Due to the lack of fast and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71
CPCG01N21/71
Inventor 陆继东陆盛资董美蓉黄健伟黎文兵
Owner SOUTH CHINA UNIV OF TECH
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