Aircraft Engine Coating Restoration Scheduling by Condition Monitoring
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Solution Overview
Problem
Turbine engine maintenance schedules are inefficient due to varying degradation rates of thermal barrier coatings, leading to either premature restoration or unnecessary downtime, as different components and environmental conditions affect the coating's wear and tear differently.
Innovation Solution
A control system with engine controllers that monitor performance data to identify coating degradation and schedule restoration procedures, allowing for on-wing or in-field restoration using a mobile coating restoration system, optimizing maintenance intervals based on historical data and operational parameters to minimize downtime and maximize engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal barrier coating is restored at regularly scheduled maintenance intervals, then engine reliability is maintained, but aircraft downtime and maintenance costs increase unnecessarily
Solution Approach 1:
The maintenance schedule transitions from static (fixed intervals) to dynamic (condition-based). The system continuously monitors coating thickness and degradation in real-time, adjusting maintenance timing based on actual coating condition rather than predetermined schedules. This allows maintenance to be performed only when necessary, reducing unnecessary downtime while ensuring reliability.
Solution Approach 2:
The system implements continuous feedback through sensors that monitor coating thickness and degradation. This feedback loop provides real-time data to the control system, which compares actual coating condition against thresholds and triggers maintenance alerts. This ensures maintenance is performed based on actual need rather than fixed schedules, optimizing the balance between reliability and downtime.
2Loss of time
If thermal barrier coating is restored based on actual degradation, then aircraft downtime is reduced, but measurement precision and detection difficulty increase
Solution Approach 1:
Traditional mechanical measurement methods (manual thickness gauges, visual inspection) are replaced with advanced non-contact sensing technologies. The system uses sensors such as eddy current sensors, ultrasonic sensors, or optical sensors to automatically measure coating thickness and detect degradation. This substitution enables precise, continuous monitoring without requiring engine disassembly or aircraft shutdown, resolving the contradiction between reduced downtime and measurement precision.
3Reliability
If coating restoration is performed unnecessarily, then engine reliability is maintained, but maintenance costs and productivity decrease
Solution Approach 1:
The system performs preliminary assessment and prediction of coating remaining useful life using monitoring data and degradation models. By predicting when coating degradation will reach critical thresholds, the system allows operators to plan maintenance during scheduled downtime or coordinate with other maintenance activities. This preliminary action prevents both premature maintenance and unexpected failures, optimizing productivity while maintaining reliability.
Data Source
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AI summary
A control system (100) having one or more controllers (110, 210, 310, 410) configured to determine a maintenance date for restoration of a coating of an engine (102) based on monitored parameters of the engine of an aircraft (106). The one or more controllers also are configured to determine an amount of coating sprayed on the engine on the determined maintenance date based on the monitored parameters and determined maintenance date. The one or more controllers also are configured to adjust the maintenance date based on needs of an aircraft fleet and regularly scheduled maintenance of the engine.