Method for evaluating damage of grinding surface of advanced ceramics based on wavelet multi-scale analysis

A multi-scale analysis and surface damage technology, applied in the direction of material inspection products, etc., can solve the problems that the time-frequency localization characteristics of surface contour signals cannot be finely described and cannot reflect the essential characteristics, so as to achieve accurate extraction and evaluation, and operability Strong, easy-to-step effects

Inactive Publication Date: 2013-06-12
TIANJIN UNIV
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Problems solved by technology

Since the surface profile is a non-stationary random signal, and the deep valley phenomenon is a local feature, methods such as Fourier transform based on the stationary

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  • Method for evaluating damage of grinding surface of advanced ceramics based on wavelet multi-scale analysis
  • Method for evaluating damage of grinding surface of advanced ceramics based on wavelet multi-scale analysis
  • Method for evaluating damage of grinding surface of advanced ceramics based on wavelet multi-scale analysis

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Embodiment Construction

[0047] The method for evaluating surface damage of advanced ceramic grinding based on wavelet multi-scale analysis of the present invention will be described in detail below in conjunction with the embodiments and drawings.

[0048] The evaluation method of advanced ceramic grinding surface damage based on wavelet multi-scale analysis of the present invention comprises the following steps:

[0049] 1) Collect the original profile data of the sample, and select the best wavelet base based on the mathematical characteristics of the wavelet base and the principle of minimizing the reconstruction error of the grinding surface of engineering ceramics.

[0050] The collection of original profile data of the sample is to use a roughness profiler to measure the grinding surface of the sample along the grinding direction, and then export the original data of the surface profile through the data processing software that comes with the instrument after measurement.

[0051] The selection...

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Abstract

The invention provides a method for evaluating damage of the grinding surface of advanced ceramics based on wavelet multi-scale analysis. The method comprises the steps of collecting original outline data of a sample, and selecting an optimal wavelet basis by combining the mathematical characteristics of the wavelet basis with a principle that a reconstruction error of the grinding surface of engineering ceramics is minimum; carrying out multi-scale decomposition by using the optimal wavelet basis, and extracting damage information by reconstructing a high-frequency coefficient; drawing a damage rate curve according to a reconstruction outline and calculating a mean damage distance; directly reading out a maximum damage depth and a maximum damage rate according to the damage rate curve; and judging a damage distribution condition. The method for evaluating the damage of the grinding surface of the advanced ceramics based on the wavelet multi-scale analysis provided by the invention has the advantages of simple steps and strong operability, can be used for accurately extracting and estimating the damage characteristics of the grinding surface of the advanced ceramics, and meets the using requirements of the quality estimation of the grinding surface of the advanced ceramics in actual engineering.

Description

technical field [0001] The invention relates to an evaluation method for surface damage of advanced ceramic grinding. In particular, it relates to an evaluation method for surface damage of advanced ceramic grinding based on wavelet multi-scale analysis. Background technique [0002] Advanced ceramics are widely used in military, aerospace, energy technology, nuclear industry and many other fields due to their excellent properties such as high hardness, high wear resistance, corrosion resistance and high temperature resistance. On the other hand, due to their hardness and brittleness, they make them It has become a difficult-to-machine material. At present, the main processing method is grinding, but the machined surface will still be damaged by cracks, cracks, and pits. At present, the evaluation of advanced ceramic grinding surfaces still uses traditional roughness indicators, such as the arithmetic mean deviation Ra of the contour, the root mean square deviation Rq of th...

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Application Information

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IPC IPC(8): G01N33/38
Inventor 林滨张彦斌梁小虎陈东
Owner TIANJIN UNIV
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