Eddy Current Probe Manipulation for Turbine Surface Inspection
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Solution Overview
Problem
Inspection of components within gas turbine engines, particularly for detecting small defects like cracks, is complicated due to their inaccessible locations and complex geometries, leading to costly and time-consuming dismantling and potential damage during traditional visual and borescope inspections, with limitations in detecting sub-surface defects.
Innovation Solution
An inspection system utilizing a macromanipulator with a micromanipulator, including a scotch yoke mechanism and eddy current probe, allows for precise, systematic inspection of confined spaces by separating movements and providing fine-scale reciprocating linear actuation, enabling detection of small defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual inspection using borescope is performed, then inspection can be conducted without dismantling, but detection of small defects and sub-surface defects is difficult
Solution Approach 1:
The patent replaces optical-based visual inspection with electromagnetic field-based eddy current inspection. The eddy current probe uses electromagnetic fields to induce currents in the conductive component surface, allowing detection of both surface and sub-surface defects without physical contact or dismantling, thus maintaining ease of operation while significantly improving measurement precision for small and subsurface defects
Solution Approach 2:
The patent changes the inspection parameter from optical reflection/transmission to electromagnetic field penetration. By using eddy current technology, the inspection system can detect defects at different depths (surface and sub-surface) by adjusting inspection parameters, thereby improving defect detection capability while maintaining non-contact inspection accessibility
2Measurement precision
If engine dismantling is performed for inspection, then thorough inspection of inaccessible components is possible, but the operation is costly and time-consuming
Solution Approach 1:
The patent replaces mechanical dismantling with electromagnetic field-based non-contact inspection. The eddy current probe can penetrate through and inspect components internally without physical access, eliminating the need for time-consuming dismantling operations while maintaining thorough inspection capability through electromagnetic field penetration
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium to transmit inspection information. Instead of physically accessing components through dismantling, the eddy current probe uses electromagnetic fields as a mediator to detect defects deep within the engine interior, thereby reducing time loss while maintaining inspection thoroughness
3Reliability
If engine dismantling and rebuilding is performed, then inspection and maintenance is achieved, but potential damage to components occurs
Solution Approach 1:
The patent replaces mechanical contact-based inspection with non-contact electromagnetic field inspection. The eddy current probe detects defects through electromagnetic field interaction without physical contact, thereby eliminating mechanical damage to components during inspection while maintaining reliability through thorough defect detection
Solution Approach 2:
The patent uses electromagnetic fields as an intermediary to inspect components without direct mechanical contact. This intermediary approach allows defect detection while preventing damage to components during the inspection process, thereby protecting component integrity while maintaining inspection reliability
4Measurement precision
If eddy current inspection is used to detect small defects, then detection capability is improved, but fine manipulation inside the engine is required
Solution Approach 1:
The patent segments the inspection system into a macromanipulator for coarse positioning and a micromanipulator for fine positioning. The macromanipulator moves the inspection end to the target area, while the micromanipulator with scotch yoke mechanism provides precise reciprocating linear actuation of the eddy current probe, thereby achieving small defect detection without requiring complex manual manipulation
Solution Approach 2:
The patent introduces dynamic reciprocating linear actuation through the scotch yoke mechanism. The actuating arm rotates to drive the probe support back and forth along guide rails, creating controlled reciprocating motion of the eddy current probe. This dynamic mechanism enables fine manipulation for small defect detection while automating the complex positioning tasks
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
The system enables accurate and efficient detection of small defects within gas turbine engines without dismantling, reducing costs and minimizing damage, while providing a digital representation for defect localization.
Implementation Method 1
eddy currents (a type of electric current) are commonly used to detect small defects (e.g., cracks) at a surface and a sub-surface level
Implementation Method 2
The scotch yoke mechanism is configured to translate the probe support in response to the rotation of the actuating arm such that the probe support slides along the pair of guide rails
Implementation Method 3
The actuating mechanism includes a magnet fixedly coupled to the actuating arm. The actuating mechanism further includes an actuating coil disposed around the housing. The actuating coil is configured to electromagnetically rotate the magnet and the actuating arm relative to the housing in response to the actuating current
Data Source
Figure 1
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Figure 3A
AI summary
An inspection system (100) for inspecting a surface (102) includes a macromanipulator (104) including an inspection end (106) configured to be disposed proximal to the surface (102). The inspection system (100) further includes a micromanipulator (108) coupled to the inspection end (106). The. micromanipulator (108) includes a housing (110), a pair of guide rails (112) at least partially disposed within and fixedly coupled to the housing (110), a probe support (114) slidably coupled to the pair of guide rails (112), an actuating arm (116) disposed within the housing (110) and coupled to the probe support (114) via a scotch yoke mechanism (118), and an actuating mechanism (120) configured to rotate the actuating arm (116) relative to the housing (110). The inspection system (100) further includes a probe (122) coupled to the probe support (114) for inspecting the surface (102).