Inspection Scope Baseline Signals for Gas Turbine Defect Detection
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Solution Overview
Problem
Existing non-destructive inspection methods for internal defects in components, such as rotor disks in gas turbine engines, are inefficient and prone to component-to-component variability, requiring extensive empirical data and frequent disassembly for inspection.
Innovation Solution
A non-destructive inspection system using a transducer and controller to generate a baseline response signal for a component, compare it with real-time inspection signals, and evaluate frequency shifts to detect defects, allowing in-situ inspections without disassembly and minimizing component variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional non-destructive inspection methods are used, then inspection can be performed, but inspection efficiency is low and component-to-component variability is high
Solution Approach 1:
The system performs a preliminary baseline inspection to establish a reference signal unique to each component. This baseline is created before the component enters service or at the start of its operational life, capturing its normal acoustic characteristics. Subsequent inspections then compare current signals against this pre-established baseline, enabling efficient defect detection without requiring complex real-time analysis of each component's entire signal profile.
Solution Approach 2:
The system continuously compares current inspection signals against the baseline signal and provides feedback about deviations. When frequency shifts or signal variations exceed predetermined thresholds, the system flags potential defects. This feedback mechanism enables automated, efficient defect detection while maintaining high measurement precision through quantitative comparison of acoustic characteristics.
2Measurement precision
If frequent disassembly is performed for inspection, then internal defects can be detected, but downtime increases and productivity decreases
Solution Approach 1:
The inspection system performs non-contact acoustic testing while the component remains installed and operational. The transducer detects vibrations and acoustic emissions from the component's internal structures without requiring physical access or disassembly. This self-service inspection approach allows continuous monitoring during normal operation, eliminating downtime associated with disassembly and reassembly while maintaining the ability to detect internal defects such as cracks, corrosion, and structural anomalies.
3Measurement precision
If empirical data is collected for each component, then inspection accuracy improves, but the amount of data required becomes extensive and complex
Solution Approach 1:
The system extracts and isolates the most critical acoustic characteristics from the complex signal data, specifically focusing on frequency spectra and amplitude ratios. By identifying and concentrating on these key parameters rather than processing every raw data point, the system achieves high measurement precision with significantly reduced data volume. The baseline signal captures only the essential acoustic fingerprint needed for defect detection, eliminating the need to store and analyze entire signal waveforms for each component.
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 efficient, real-time detection of defects in gas turbine engine components with reduced downtime and cost, providing accurate trend data for predictive maintenance and extended component life assessment.
Implementation Method 1
transmitting a first signal into the component and sensing the component for a second signal produced as a result of the first signal being transmitted into the component
Data Source
AI summary
A method of inspecting a metallic gas turbine component is provided that includes: (a) providing a baseline inspection response signal using a transducer to perform an initial inspection of a component that includes transmitting a first initial signal into the component and sensing the component for a second initial signal produced by the first initial signal being transmitted, wherein the baseline inspection response signal is representative of the second initial signal and is unique to the component; (b) using the transducer to inspect the component, the inspection including transmitting a first signal into the component and sensing the component for a second signal produced by the first signal being transmitted into the component, and producing an inspection response signal representative of the second signal; and (c) evaluating the inspection response signal to determine the presence or absence of a defect using the baseline response signal.