Manual Eddy Current Probe Guide for Aircraft Fan Blade Inspection
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Solution Overview
Problem
Current non-destructive testing methods for detecting cracks in aircraft engine fan blade roots, particularly those under significant centrifugal stress, require expensive automated equipment to ensure rigorous and orthogonal sensor movement, which is not feasible for all maintenance units.
Innovation Solution
A manual non-destructive testing device with a probe and guide system, where the probe is articulated and mounted at the end of a handle with a coaxial sleeve guide, allowing controlled parallel trajectories along the constant profile of the blade root, ensuring the sensor remains perpendicular to the surface, and adjustable via a threaded section for effective crack detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated equipment is used to ensure rigorous and orthogonal sensor movement, then measurement precision and reliability are improved, but device complexity and cost increase
Solution Approach 1:
The patent introduces a guide element as an intermediary component that interfaces between the automated positioning system and the probe. This guide element provides precise geometric constraints (perpendicularity and parallelism) that ensure accurate sensor movement without requiring complex control mechanisms directly in the probe, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent replaces complex mechanical positioning mechanisms with a simpler system based on geometric guidance. The guide element with its specific geometric features (perpendicular reference surface, parallel constraint surfaces) substitutes for elaborate mechanical control systems, achieving precise sensor movement through geometric constraints rather than complex mechanical actuation
2Measurement precision
If automated equipment is used to define parallel trajectories, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The guide element is designed to be self-aligning with the component surface through its geometric features. The perpendicular reference surface automatically orients the probe correctly relative to the surface being inspected, and the parallel constraint surfaces automatically define the trajectory spacing. This self-service mechanism eliminates the need for complex setup procedures while maintaining high measurement precision
Solution Approach 2:
The guide element is pre-configured with specific geometric features (perpendicularity and parallelism) that automatically establish the correct trajectories before the inspection begins. This preliminary geometric preparation eliminates the need for complex real-time adjustments during operation, improving both precision and ease of use
3Device complexity
If manual inspection is used to reduce equipment complexity, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The guide element serves as an intermediary that bridges the simple manual probe and the requirement for precise measurements. By providing fixed geometric constraints, the guide element ensures that even a simple manual probe can achieve accurate and repeatable measurements, thus resolving the contradiction between device simplicity and measurement precision
4Measurement precision
If multiple parallel trajectories are defined to cover the inspection area, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The guide element is designed to be movable along the component surface, allowing the operator to dynamically reposition it to define multiple parallel trajectories. This dynamic capability enables efficient coverage of large inspection areas by systematically moving the guide element to establish adjacent trajectories, maintaining measurement precision while reducing total inspection time compared to fixed positioning methods
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
Enables reliable and systematic manual inspection of blade roots using eddy current sensors, facilitating the detection of cracks without the need for expensive automated equipment, ensuring effective crack detection even in less-equipped maintenance units.
Implementation Method 1
a probe housing a sensor developing the phenomenon that one wishes to exploit, (for example a simple coil supplied with alternating current for detection by eddy currents, in the case of a metal part)
Data Source
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AI summary
The invention relates to testing by using Foucault currents to detect defects at the surface or at a low depth of a part, in particular a vane base of the fan of an airplane engine. The device comprises a probe (20) containing a sensor (21), the probe being hingedly mounted to the end of a shaft (27), a guide (29) having a reference surface (31), and means for adjusting the position of the guide so as to be parallel to an axis of the shaft.