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Embedded planar coil array sensor used for blade curved surface crack detection

A planar coil, crack detection technology, applied in the direction of instruments, measuring devices, elasticity testing, etc., can solve the problem of high production cost of flexible array sensors, and achieve the effect of high production cost, low price and easy realization.

Inactive Publication Date: 2014-08-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the production cost of flexible array sensors is very high, which brings many constraints to general experimental research and engineering applications.

Method used

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  • Embedded planar coil array sensor used for blade curved surface crack detection
  • Embedded planar coil array sensor used for blade curved surface crack detection
  • Embedded planar coil array sensor used for blade curved surface crack detection

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Embodiment Construction

[0030] In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] In the embodiment, an iron-based aero turbine engine blade is selected as the test piece, which is a typical small-curvature surface part. A group of crack defects with different parameters are prefabricated on the blade by electric spark scratching, and its size is (length × width × depth): 10mm×0.1mm×0.3mm, 10mm×0.1mm×0.15mm, 5mm×0.1mm×0.3mm, 5mm×0.1mm×0.15mm, 10mm×0.1mm×0.2mm.

[0032] According to the specific detection steps above, the specific detection results obtained are as follows Figure 9 As shown (due to the large amount of test result data, only a 10mm long crack is taken as an example), it can be seen that there will be a sudden change in the signal amplitude where there is a crack; the imaging effect is as follows Figure 10 shown.

[003...

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Abstract

The invention relates to a method and device used for crack and other defect detection of irregular small-curvature curved surface parts, such as defect detection of aircraft engine turbine blades, and belongs to the technical field of electromagnetic nondestructive detection of metal damage and fatigue process. In order to meet the requirements of curved surface crack and other defect detection, a traditional rigid planar array sensor is no longer applicable, only an array sensor must having a certain flexibility can fit with the surface of a to-be-tested piece, the detection gap requirement can be ensured, and the test results are not invalid. A known electromagnetic flexible probe is made by a flexible circuit board making method, is expensive and is difficult to adapt to the needs of studies on sensor structure optimization and basic design. The invention discloses an embedded array structure combining a flexible substrate and a rigid plane electromagnetic coil, the production cost is greatly reduced, and the embedded array structure has the certain ability of bending and deformation, can satisfy the detection requirements of blade small-curvature curved surface test pieces, and has the advantages of being high in detection efficiency, simple and convenient, low-cost and the like.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic non-destructive testing, and relates to a flexible array probe technology designed and manufactured for detecting small-curvature surfaces, which can be used for damage detection of irregular small-curvature surfaces such as aeroengine turbine blades. Background technique [0002] Small curvature surface is an important structural form of metal parts, typical structures such as various engine blades, steam turbine blades, wind turbine blades, etc. Considering aerodynamic factors, such parts are often designed as small curvature surface structures with no large curvature corners and smooth transitions. The defect damage detection technology of small curvature surface has been a problem that has not been well solved. Traditional detection methods such as magnetic particle, penetration, etc., although the detection results are reliable, but the efficiency is very low, which cannot meet the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/83
CPCG01M5/0016
Inventor 张卫民于霞秦峰陈国龙曾卫琴
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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