Crack detection method and system
A crack detection and crack technology, which is applied in the field of crack detection methods and systems, can solve the problems of limited number, insensitivity of early micro cracks, difficulty in online monitoring, etc., and achieve the effect of avoiding economic losses
Active Publication Date: 2018-11-16
JIANGSU GOLDWIND SCI & TECH CO LTD
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Problems solved by technology
Ultrasonic testing is a common flaw detection method, but this method has certain requirements for the experience of the operator, and it is difficult to achieve online monitoring
The off-line inspection method is limited by the operation and maintenance cycle. If no crack initiation is found during maintenance, or crack initiation and further deterioration occurs during equipment operation, it will still lead to structural component failure.
Machine vision detection and vibration detection can realize online monitoring, but both machine vision detection and vibration detection are not sensitive to early micro cracks
Moreover, machine vision detection requires a large number of crack features for recognition training. If the crack features are not in the existing training set, misjudgment and missed judgment are likely to occur. Therefore, it is required to collect a large amount of crack data before application. The application is limited by the experimental conditions and the number of sample parts, and often does not have the conditions for implementation
Vibration detection is difficult to identify cracks in static and low-speed structural components, and often requires the participation of expert systems
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[0042] Various example embodiments will now be described more fully with reference to the accompanying drawings, in which some example embodiments are shown.
[0043] figure 1 A flowchart showing a crack detection method according to an exemplary embodiment of the present invention. It should be understood that when the component to be inspected (for example, a metal component) is subjected to an exceeding limit or is subjected to an alternating load for a long time, after exceeding the fatigue limit, cracks will appear inside and on the surface of the component to be inspected. figure 1 The crack detection method shown is capable of detecting visible surface cracks on the part to be inspected.
[0044] refer to figure 1 , and in step S10, multiple images of a predetermined area on the component to be inspected are acquired.
[0045] Here, a plurality of speckles are arranged in a predetermined area. For example, multiple speckles may consist of a series of speckles that a...
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The invention provides a crack detection method and system. The crack detection method comprises the following steps of acquiring multiple images in a prospective region on a component to be detected,wherein multiple speckle points are arranged in the prospective region; tracing position changes of multiple speckle points based on the multiple acquired images to acquire a stress field of the prospective region; and according to a comparison result of a stress maximal value in the stress field and a set stress threshold value, determining whether the component to be detected has a crack or not. By adopting the crack detection method and system of the embodiment of the invention, online detection can be performed on the crack, and the economic loss caused by the crack checking after shutdown is avoided.
Description
technical field [0001] The present invention generally relates to the field of crack monitoring, and more particularly, to a crack detection method and system. Background technique [0002] When the stress of the structural components reaches the failure limit, or when the fatigue life reaches the limit after being subjected to alternating stress for a long time, the structural components will initiate cracks in a certain area, and the cracks will develop rapidly, resulting in the fracture of the structural components and the failure of the structural components. For the key structural components of the equipment, once the failure occurs, it is likely to cause serious safety accidents and economic problems. [0003] At present, the inspection methods for cracks in structural components include ultrasonic inspection, manual inspection, machine vision inspection, and vibration inspection. Ultrasonic inspection and manual inspection are mainly used for offline inspection. If ...
Claims
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IPC IPC(8): G01N21/88G01N21/01
CPCG01N21/01G01N21/88G01N21/8851G01N2021/0112Y02E10/72
Inventor 吕品杨炯明
Owner JIANGSU GOLDWIND SCI & TECH CO LTD