Automatic determination method of friction mark direction angle of friction spot image of four-ball friction test

A measurement method and a technology of direction angle, which is applied to measuring devices, material analysis through optical means, instruments, etc., can solve problems such as inaccurate measurement accuracy and perception errors of experimenters, and achieve the goal of overcoming measurement accuracy and increasing processing speed Effect

Inactive Publication Date: 2017-05-31
CHANGAN UNIV
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Problems solved by technology

It solves the defects of inaccurate measurement accuracy caused by the perception error of the test personnel in the existing measurement method

Method used

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  • Automatic determination method of friction mark direction angle of friction spot image of four-ball friction test
  • Automatic determination method of friction mark direction angle of friction spot image of four-ball friction test
  • Automatic determination method of friction mark direction angle of friction spot image of four-ball friction test

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Embodiment Construction

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] The present invention proposes a method for automatically detecting the direction angle of a steel ball wear scar image, comprising the following steps:

[0039] Step S1: collecting wear scar images of the test steel balls through a scanning electron microscope. Specifically: after the four-ball friction test, the three bottom steel balls used in the test were taken out and placed in the scanning electron microscope, and the parameters such as the illumination and magnification of the scanning mirror were adjusted at the same time to clearly collect the wear spot image. The collected wear scar image is denoted by F, and the size of the wear scar image F is M×N. The wear spot image F collected in the embodiment is as figure 1 As shown, its size is 768×1024, that is, M=768, N=1024, use (x, y) to represent the coordinates of any pixel of...

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Abstract

The invention provides an automatic determination method of a friction mark direction angle of a friction spot image of a four-ball friction test. The method comprises the steps of performing graying processing on the acquired friction mark image without an obvious color, increasing a processing speed of the image, obtaining a plurality of groups of run error peak values by cyclic rotation of a grey friction spot image, and finally obtaining the friction mark direction angle via the obtained maximum run error peak value. The friction mark direction angle can be precisely determined by the quantitative method, and the influence on the measurement precision due to inadequate experience of testing personnel is avoided. And the precise friction mark direction angle can be obtained without contrastive analysis for many times.

Description

technical field [0001] The invention relates to an extended application of a four-ball friction testing machine for measuring the lubricating performance of lubricating oil, in particular to a method for automatically measuring the direction angle of a wear scar image of a four-ball friction test. Background technique [0002] The four-ball friction test is carried out in a four-ball friction testing machine, and the lubricating performance of the lubricating oil is determined by observing the diameter values ​​of the wear scar images in two directions under a high-power scanning electron microscope. One measurement direction is along the wear scar direction, and the other measurement direction is the direction perpendicular to the wear scar direction. During the test, the two directions are qualitatively perceived by the test personnel. In order to overcome the experimenter's perception error, it is very important to quantitatively determine the direction angle of the wear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84
CPCG01N21/84
Inventor 肖梅张雷彭朝林
Owner CHANGAN UNIV
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