Blade Trailing Edge Eddy Current Array Scanning In Situ
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Solution Overview
Problem
Conventional eddy current testing methods for aircraft engine blade trailing edges are inefficient and require significant operator expertise, failing to achieve effective contact with complex blade geometries and leading to low detection sensitivity.
Innovation Solution
An eddy current testing sensor with equidistantly arranged elastic detection belts and a high-density sponge layer, mounted on a fixed ring, rotates with the engine wheel to conformally scan trailing edges, using a high-frequency, multi-frequency excitation mode for three-dimensional imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single conformal eddy current probe is manually traversed along the blade trailing edge, then detection sensitivity is maintained, but detection efficiency is low
Solution Approach 1:
The patent divides a single probe into multiple independent detection belts (e.g., 4-16 belts) arranged in an array, each capable of detecting a specific region of the blade trailing edge. This segmentation enables parallel detection across multiple blades simultaneously, dramatically improving detection efficiency while maintaining the sensitivity of individual probes.
Solution Approach 2:
The patent combines multiple detection belts into a single integrated sensor assembly that can be mounted on the engine wheel. This merging allows simultaneous detection of multiple blades during a single rotation, converting sequential inspection into parallel operation and resolving the time loss issue.
2Productivity
If a dedicated conformal eddy current probe is used, then reliable detection is achieved, but the method requires significant operator expertise and is inefficient
Solution Approach 1:
The eddy current array sensor is designed to be self-aligning through elastic detection belts that automatically conform to the blade trailing edge geometry. The system performs self-calibration and adaptive positioning during operation, reducing the need for operator intervention and expertise while maintaining reliable detection.
Solution Approach 2:
The patent employs multi-frequency excitation signals and advanced signal processing parameters to enhance detection capability. By changing the electrical parameters (frequency, amplitude) and using automated analysis algorithms, the system reduces dependence on operator expertise while improving detection efficiency.
3Measurement precision
If conventional eddy current testing is performed on complex blade geometries, then detection coverage is limited, but achieving effective contact is difficult
Solution Approach 1:
The patent uses flexible elastic detection belts as the sensing element, which can conform to complex blade trailing edge geometries. These thin, flexible structures adapt to varying curvatures and profiles, ensuring effective contact and maintaining detection sensitivity across diverse blade designs while improving adaptability.
Solution Approach 2:
The detection belts are designed with elastic properties that allow dynamic adaptation to different blade geometries. The system transitions from rigid contact to flexible, adaptive contact, enabling effective detection across varying blade profiles and improving versatility without compromising measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances detection efficiency and sensitivity by enabling a single-pass scan of multiple blades, improving contact with complex geometries and providing detailed three-dimensional imaging.
Implementation Method 1
eddy current testing has proven most reliable and practical... eddy current array testing channel... scanning the trailing edges of all of the aircraft engine blades using the eddy current testing sensor to obtain eddy current detection signals
Implementation Method 2
the contoured eddy current testing coil adopts a high-frequency, multi-frequency excitation mode
Data Source
AI summary
The present disclosure relates to eddy current detection technologies and discloses an in-situ rapid eddy current testing method for trailing edges of aircraft engine blades. The method utilizes a specially engineered elastic array eddy current sensor buckled to a fixed ring of an engine wheel. By rotating the engine wheel, a single-pass scan simultaneously inspects the trailing edges of tens to hundreds of the aircraft engine blades. Compared to conventional methods utilizing a single conformal probe manually traversed along the trailing edges, the present disclosure greatly improves the detection efficiency and has higher detection sensitivity.