Aircraft Engine FOD Detection Using Vibration and Performance Validation
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Solution Overview
Problem
Existing aircraft engines face challenges in managing foreign object damage (FOD) that lead to increased inspection frequencies and unscheduled downtime, necessitating improved methods for detection and monitoring.
Innovation Solution
A method involving the monitoring of vibration and performance parameters using sensors, where confirmed FOD events are registered in a non-transitory memory after validation by multiple parameters, and communicated wirelessly to crew or ground stations, with the option to update engine models and specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If FOD detection is performed using a single parameter threshold, then detection simplicity is maintained, but false positives increase leading to unnecessary maintenance
Solution Approach 1:
The FOD detection process is segmented into multiple independent parameter monitoring streams (vibration, temperature, pressure, acoustic emissions). Each parameter is evaluated separately against its own threshold, and only when multiple parameters simultaneously indicate FOD is a confirmed event. This segmentation allows the system to maintain operational simplicity while dramatically reducing false positives through cross-validation.
Solution Approach 2:
The patent introduces an intermediary validation layer that mediates between raw sensor data and final FOD determination. Instead of directly triggering maintenance alerts from single-parameter thresholds, the system uses multiple parameters as intermediaries to validate each other's indications, ensuring that only genuine FOD events trigger alerts and reducing unnecessary maintenance interventions.
2Measurement precision
If multiple parameters are monitored and validated to confirm FOD events, then detection accuracy improves, but system complexity increases
Solution Approach 1:
The monitoring system is designed with multi-functionality, where a single integrated control unit handles multiple parameter acquisitions, comparisons, and validations. The same hardware infrastructure supports monitoring of vibration, temperature, pressure, and acoustic emissions simultaneously, reducing overall system complexity despite the multi-parameter approach. This universal platform achieves high detection accuracy without proportionally increasing device complexity.
Solution Approach 2:
The patent merges multiple monitoring functions into a unified FOD detection system. Instead of separate systems for vibration monitoring, temperature monitoring, and acoustic monitoring, the invention combines these functions into a single integrated system that processes all parameters through a common validation logic, thereby improving detection accuracy while controlling system complexity through consolidation.
3Productivity
If FOD events are detected and confirmed through multiple validations, then unnecessary maintenance is reduced, but detection time may increase
Solution Approach 1:
The system performs preliminary continuous monitoring of all parameters before FOD events occur, maintaining baseline data for comparison. When an event is detected, the validation process compares against pre-established thresholds and patterns, enabling rapid confirmation without lengthy analysis. This preliminary preparation reduces detection time while maintaining high accuracy through multiple validations.
Solution Approach 2:
The monitoring system implements continuous feedback loops where detected events immediately trigger validation checks, and confirmed FOD events provide feedback that updates the system's understanding of normal versus abnormal conditions. This feedback mechanism enables the system to learn from past events and improve detection speed over time, reducing the time penalty associated with multi-parameter validation.
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
Reduces false positives and enhances the accuracy of FOD detection, minimizing unnecessary maintenance and downtime by confirming FOD events through multiple sensor validations.
Implementation Method 1
monitoring a vibration parameter associated with the aircraft engine; receiving the one or more values from an accelerometer
Implementation Method 2
monitoring a performance parameter associated with the aircraft engine; receiving the one or more values from one or more of: a pressure sensor
Implementation Method 3
receiving the one or more values from one or more of: a pressure sensor; a torque sensor; and a temperature sensor
Data Source
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AI summary
A method of monitoring operation of an aircraft engine (10) includes, during operation of the aircraft engine (10), monitoring a vibration parameter (110) associated with the aircraft engine (10) and monitoring (114) a performance parameter associated with the aircraft engine (10). In response to determining that one or more values of one of the vibration parameter and the performance parameter are indicative of foreign object damage (FOD) to the aircraft engine (10), determining whether one or more values of the other one of the vibration parameter and the performance parameter are indicative of FOD to the aircraft engine. In response to determining that the one or more values of both the vibration parameter and the performance parameter are indicative of FOD to the aircraft engine (10), registering (122) a confirmed occurrence of FOD to the aircraft engine in a non-transitory memory (414) associated with the aircraft engine.