Pantograph Crack Fault Detection Method Based on Moving Parallel Window in Curve Wave Domain

A technology of fault detection and pantograph, applied in the direction of optical testing flaws/defects, instruments, characters and pattern recognition, etc., can solve problems such as pantograph-catenary accidents, and achieve the effect of detection and effective extraction

Inactive Publication Date: 2011-12-21
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the existing researches on pantograph faults focus on the detection of exceeding the wear limit of the skateboard, and there are few studies on the detection of the bad state of the skateboard surface (such as crack detection), and the crack fault of the skateboard can easily cause more serious pantograph-catenary accidents

Method used

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  • Pantograph Crack Fault Detection Method Based on Moving Parallel Window in Curve Wave Domain
  • Pantograph Crack Fault Detection Method Based on Moving Parallel Window in Curve Wave Domain
  • Pantograph Crack Fault Detection Method Based on Moving Parallel Window in Curve Wave Domain

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Embodiment

[0085] Below the present invention is described in detail in conjunction with example:

[0086] The front end of the pantograph has serious scratches on the slide plate, and there is a vertical crack in the middle of the back end slide plate. The extraction results of the slide plate are as follows: Figure 4 As shown, the size of the image is 47×1508×3. Due to the cracks in the skateboard itself and the inaccurate installation, the short slider on the skateboard has been deformed and displaced, so that the extracted skateboard image contains a part of the background. Image, the top and bottom edges of the skateboard are not strictly horizontal either. The results of crack extraction experiments are as follows: Figure 5 shown. like Figure 6 , select two pictures with light exposure problems to verify the algorithm. There is a vertical crack in the middle of picture (a), there is a vertical crack in the middle of picture (b), and there is a crack parallel to the joint in ...

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Abstract

The invention discloses a method for detecting a pantograph crack fault based on a curvelet domain moving parallel window, and the method comprises the following steps of: acquiring pantograph images through image pickup systems along a train track, performing a series of preprocessing operations on the acquired images to obtain slipper images; performing second-generation curvelet transform on the slipper images, converting images in a spatial domain into a curvelet decomposition coefficient matrix in a curvelet domain, analyzing, classifying and threshold-processing the curvelet decomposition coefficient matrix by using a moving parallel window method, filtering off curvelet coefficients corresponding to all the inherent image elements, except cracks, on the slipper images, and finally,performing inverse transform on the processed curvelet decomposition coefficient matrix so that slipper crack images can be extracted to implement the detection and recognition for pantograph slippercrack fault. Aiming at the singularity characteristic of pantograph slipper crack lines, the method provided by the invention can be used for effectively capturing the linear characteristics of the crack images by means of curvelet transform, and precisely and effectively extracting crack characteristics to implement the detection for the pantograph crack fault.

Description

technical field [0001] The invention relates to the field of manufacturing high-speed railway detection equipment, in particular to a method for identifying cracks on a pantograph slide plate Background technique [0002] All high-speed railways use electric traction, which is the most energy-efficient and environmentally friendly rail transit traction method known so far. Therefore, at present, all newly-built rail transit, whether it is high-speed, heavy-duty, or urban rail transit, almost all use electric traction. Electric locomotives draw current from the catenary under high-speed operating conditions, and must ensure uninterrupted and absolutely reliable current reception during operation. How to ensure high-speed trains have good current reception quality is one of the key technologies for electrified railways. [0003] The pantograph is a device for an electric locomotive to draw current from the catenary. It is in direct contact with the catenary wire and obtains c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G06K9/00G06K9/36
Inventor 刘志刚陈坤峰
Owner SOUTHWEST JIAOTONG UNIV
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