Aircraft Engine Thermal Event Indicator
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Solution Overview
Problem
Current aircraft engine fire sensors, such as those using thermistors, are limited in their ability to detect non-flight safety issues in a timely manner, which can lead to inadequate maintenance scheduling and potential safety risks.
Innovation Solution
A thermal event detection system that utilizes sensors to collect data on temperature changes within the engine compartment, calculates a time series moving average, determines standard deviations, and generates alerts when temperature rate-of-change trends exceed certain criteria, allowing for proactive maintenance scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fire sensors (thermistors) are used to monitor temperature in the engine compartment, then flight safety is ensured by detecting critical fire conditions, but the ability to detect non-flight safety issues timely is insufficient
Solution Approach 1:
The patent segments the temperature monitoring function into two distinct detection modes: flight safety monitoring (critical fire detection) and maintenance scheduling monitoring (non-critical thermal events). This is achieved by dividing the analysis into different rate-of-change thresholds and time windows, allowing the system to simultaneously ensure flight safety while enabling timely maintenance scheduling for non-critical issues.
Solution Approach 2:
The patent applies partial action by focusing monitoring efforts on specific thermal event characteristics rather than all temperature conditions. By detecting trends in temperature rate-of-change that exceed normal operational variations but remain below critical fire thresholds, the system enables proactive maintenance scheduling for partial thermal anomalies without requiring full-scale fire response protocols.
2Device complexity
If a simple temperature threshold alert system is used, then the system complexity is low, but the measurement precision for detecting thermal trends is insufficient
Solution Approach 1:
The patent transforms the static temperature threshold comparison into a dynamic analysis by continuously calculating the rate-of-change of temperature over time. The system adapts the detection criteria based on the temporal behavior of temperature changes, using moving time windows to evaluate whether temperature increases exceed normal operational variations. This dynamic approach significantly improves thermal event detection precision while maintaining relatively simple system architecture.
Solution Approach 2:
The patent implements feedback mechanisms by continuously monitoring temperature rate-of-change and comparing it against dynamically calculated thresholds based on historical data and operational conditions. The system provides feedback through alerts when thermal trends indicate potential issues, enabling continuous refinement of detection accuracy without requiring complex hardware modifications.
3Ease of manufacture
If existing thermistor sensors are used for fire detection, then additional sensor costs are avoided, but the detection capability for non-flight safety issues is limited
Solution Approach 1:
The patent makes the existing thermistor sensors multi-functional by implementing a sophisticated data processing system that extracts multiple types of information from the same sensor inputs. The system simultaneously performs flight safety monitoring, maintenance scheduling detection, and thermal trend analysis using the existing temperature data, thereby avoiding additional sensor costs while significantly expanding detection capabilities through software-based analysis of temperature rate-of-change patterns.
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
This system effectively identifies trends in temperature changes, enabling timely maintenance activities and improving flight safety by using existing sensors to detect non-flight safety issues before they become critical.
Implementation Method 1
Fire sensors usually include thermistors. Using the thermistors, a system may generate an alert when a detected temperature exceeds a threshold.
Data Source
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AI summary
A method for monitoring thermal events in an aircraft engine compartment (100) includes obtaining first sensor data from a first sensor located within an engine compartment (100) of an aircraft. The method also includes determining a time series moving average based at least in part on a subset of the first sensor data. The time series moving average is indicative of an average temperature rate-of-change of the engine compartment (100). The method further includes determining a standard deviation of the time series moving average and detecting a trend of temperature rates-of-change that satisfy a rate-of-change criterion. The rate-of-change criterion is based on a multiple of the standard deviation, and the temperature rates-of-change are based on temperatures of the engine compartment (100). The method also includes generating an alert in response to detecting the trend. The alert is indicative of a thermal event associated with the engine compartment (100).