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Foreign object damage cross section microcrack rapid imaging method based on image recognition

An imaging method and technology of micro-cracks, which are applied in character and pattern recognition, measuring devices, instruments, etc., can solve the problems of not giving micro-cracks identification, etc.

Inactive Publication Date: 2020-04-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the means for identifying and researching microcracks are not provided in the above prior art

Method used

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  • Foreign object damage cross section microcrack rapid imaging method based on image recognition
  • Foreign object damage cross section microcrack rapid imaging method based on image recognition

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Embodiment Construction

[0022] Please combine figure 1 As shown, the present invention discloses a method for rapid imaging of microcracks in a damaged section of a foreign object based on image recognition, comprising the following steps:

[0023] (1) Using the air cannon method to prefabricate FOD damage on the leading edge of the aeroengine blade. The typical microscopic damage characteristics of foreign object damage in aero-engines when microcracks occur. The air cannon method is the method closest to the damage caused by a real foreign object hitting the blade under laboratory conditions. The basic structure of the air cannon can be found in the Chinese invention patent application with publication number 110160728A Or the Chinese invention patent whose notification number is 103512423B includes a speed measuring device, a cylinder, a gun barrel connected to the cylinder, a bullet rest located in the gun barrel, and a projectile is located in the bullet rest; the tested aeroengine blade test pi...

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Abstract

The invention relates to a foreign object damage cross section microcrack rapid imaging method based on image recognition. The method comprises the following steps: prefabricating FOD damage by usingan air cannon method, longitudinally sectioning the FOD position of a damaged blade to obtain a micro-crack observation sample at the FOD position, observing the sample by using a scanning electron microscope, and shooting a micro-image with micro-cracks. Image recognition technology is utilized to obtain coordinate values of pixel points corresponding to microcrack characteristics, a Matlab compilation program is utilized to draw a spline curve of a microcrack shape according to the coordinate values, and a technical means is provided for obtaining microcracks in different states and establishing an FOD notch model containing the microcracks.

Description

technical field [0001] The invention belongs to the technical field of damage analysis of aeroengine blades. Background technique [0002] The speed of the aero-engine is extremely high, and the front end of the engine in operation is like a huge air extractor. When the aircraft takes off and lands on the runway or the deck of an aircraft carrier, it will often inhale "hard objects" such as stones, gravel, bolts, and metal fragments. These foreign objects Entering the engine will hit the first few stages of compressor blades, especially the leading edge of the blades, causing damage. The US military standard MIL-E-5007D, the national military standard GJB242-87 and JSGS-87231A and other standards call the damage caused by metal, sand and other hard objects hitting the engine as "foreign object damage" (FOD, Foreign Object Damage for short). Typical millimeter-sized foreign objects such as stones, gravel, etc., can reach a relative speed of 100m / s-350m / s to the blades of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2251G01N23/2202G06K9/00G06K9/46
CPCG01N23/2251G01N23/2202G06V20/20G06V10/462
Inventor 赵振华陈伟张钧贺徐凯龙韩佳奇王凌峰陆楷楠
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS