Conductive Fiber Network for Rotating Blade Crack Detection
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Solution Overview
Problem
Existing methods for detecting cracks in rotating components of engines, such as vibration sensing, lack sensitivity to the exact location of cracks and are complex, making it difficult to detect small individual cracks in high-risk areas, and require costly and time-consuming manual inspections.
Innovation Solution
A network of carbon fibers embedded in the rotating blades that form an electric circuit, breaking upon crack formation and generating a detection signal, allowing for sensitive crack location and magnitude detection during operation or testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration sensing method is used to detect cracks in rotating components, then real-time detection capability is achieved, but sensitivity to crack location and ability to detect small individual cracks deteriorates
Solution Approach 1:
The blade is divided into multiple sensing zones with embedded conductive fibers arranged in specific patterns. Each zone can independently detect cracks in its specific location, enabling both real-time detection and precise crack location identification. The segmentation allows the system to maintain high measurement precision across different blade regions while preserving real-time monitoring capability.
Solution Approach 2:
The conductive fiber network is designed with varying density and configuration in different blade regions based on crack probability and detection requirements. High-risk areas have denser fiber networks for enhanced sensitivity, while lower-risk areas have sparser networks. This local quality variation enables the system to optimize both real-time detection capability and crack location precision without requiring uniform high-cost sensing throughout the entire blade.
2Reliability
If vibration sensing method is used for crack detection, then real-time monitoring is achieved, but device complexity increases due to requirement for peripheral electronic components
Solution Approach 1:
The conductive fibers serve dual functions: they are both structural reinforcement elements embedded in the blade and sensing elements for crack detection. This merging eliminates the need for separate peripheral electronic components, reducing device complexity while maintaining real-time monitoring capability. The fiber network itself forms the sensing circuit, integrating the sensing function directly into the blade structure.
Solution Approach 2:
The blade structure itself provides the sensing function through the embedded conductive fiber network. The blade's own structural integrity and electrical conductivity are utilized for detection, eliminating the need for external sensing devices. The system is self-contained, with the blade both performing its aerodynamic function and serving as the sensing medium, thereby reducing overall device complexity.
3Measurement precision
If manual inspection with fluorescent solution is performed, then crack detection sensitivity is improved, but loss of time and productivity deteriorate due to engine disassembly requirement
Solution Approach 1:
The conductive fiber network is embedded in the blade during manufacturing, establishing the sensing capability in advance. This preliminary action eliminates the need for time-consuming disassembly and fluorescent solution application during inspection. The pre-installed fiber network enables immediate real-time monitoring without requiring engine removal or disassembly, thus resolving the contradiction between detection sensitivity and inspection time.
Solution Approach 2:
The manual mechanical inspection process using fluorescent solutions and ultraviolet light is replaced by an electrical sensing system. The conductive fiber network detects cracks through electrical circuit interruption, substituting the mechanical/disassembly-based inspection method. This replacement maintains high crack detection sensitivity while eliminating the time loss associated with engine disassembly and manual processing.
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 real-time, sensitive detection of cracks in rotating blades, reducing the risk of catastrophic failures by providing early warning signals without the need for complex electronic components or costly disassembly, and is tailored to specific high-risk areas.
Implementation Method 1
The fibers are connected and are in the proximity of a magnetic member. An electric circuit is established in the carbon fiber network, when the blade rotates.
Data Source
AI summary
A method and apparatus for detecting structural anomalies in the body of rotating members of an engine involves establishing an electric circuit in the body of the rotating members by embedding a network of electrically conductive fibers. Upon rotation of the members in the presence of a magnetic field, an electric current flows in the electrically conductive fibers of the rotating members. Detection of a structural anomaly in any of the rotating members results from detecting a break of the electric circuit.