Method for measuring aircraft skin surface state physical characteristics

A technology of surface state and measurement method, which is applied in the field of crack identification and detection technology, and can solve problems such as facility hazards and affecting the performance of aircraft skins.

Active Publication Date: 2020-06-09
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0007] Surface fatigue cracks seriously affect the perfo

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  • Method for measuring aircraft skin surface state physical characteristics
  • Method for measuring aircraft skin surface state physical characteristics
  • Method for measuring aircraft skin surface state physical characteristics

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Embodiment Construction

[0047] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not restricted in any way. Any changes or substitutions made based on the teachings of the present invention belong to the protection scope of the present invention.

[0048] Such as figure 1 As shown, the image acquisition system is mainly composed of various optical equipment, mechanical instruments and data storage facilities. The image acquisition system is mainly used to acquire the surface crack images of the monitored object and store it for subsequent processing and analysis. The image recognition system is mainly based on software. The image recognition system mainly completes the recognition of characteristic values ​​such as the length and width of surface cracks.

[0049] The image acquisition system mainly includes CCD cameras, LED lights, fixtures, video acquisition cards and computers. figure 2 The schematic diagram of the crack ...

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Abstract

The invention provides a method for measuring aircraft skin surface state physical characteristics. The method comprises the following steps: firstly, acquiring a surface crack image of a monitored object by adopting an image acquisition system; graying the image, and representing a digital image by using a matrix; filtering the crack image by adopting one or more of a spatial domain filter, a sharpening filter or a median filter to enhance the image; performing image binaryzation by adopting an improved region generation method based on the obtained enhanced image; correcting the crack regionand the contour edge of the binarized image by adopting multiple expansion and corrosion operations; searching the skeleton of the image by adopting a refining operation method, replacing the original image with the skeleton, and extracting the boundary contour of the crack by adopting crack boundary extraction; and finally, calculating the length of the crack based on the extracted crack skeleton and calculating the width of the crack based on the extracted crack contour. The invention provides a crack length and width identification and detection method with higher precision.

Description

Technical field [0001] The invention provides a method for measuring the physical characteristics of the surface state of an aircraft skin, in particular to a crack identification and detection technology that uses a crack skeleton to calculate a crack length and a crack contour to calculate a crack width. Background technique [0002] Fatigue damage accidents caused by alternating loads account for 95% of the total number of mechanical structural failures. Fatigue has become the main cause of facility failure, and fatigue damage is mainly caused by fatigue cracks. The so-called fatigue crack failure refers to the suddenness that occurs when the surface of the crack is periodically compressed and separated under the action of repeated varying stress, so that the crack grows. When the crack develops to a certain extent, the remaining section cannot meet the requirements of static strength. Invalidate. Monitoring and identifying fatigue cracks on the surface of facilities is an i...

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Application Information

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IPC IPC(8): G01B11/02
CPCG01B11/022
Inventor 曾向荣刘衍龙鑫周典乐孙博良钟志伟
Owner NAT UNIV OF DEFENSE TECH
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