Conductivity Sensor for Aircraft Component Oxidation Catalyst Detection

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Solution Overview

Problem

Aircraft brake assemblies experience varying rates of wear due to exposure to oxidation catalysts like deicing fluids, leading to unpredictable component lifespan and increased maintenance costs, as existing systems lack effective detection methods for such exposures.

Innovation Solution

An electrical conductivity sensor system is used to detect exposure to oxidation catalysts by generating signals indicative of electrical conductivity, with a processor determining if the conductivity exceeds a threshold value, allowing for the tracking of exposure events and prediction of component lifespan and maintenance costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If traditional maintenance scheduling is used based on fixed time intervals, then maintenance planning is simplified, but maintenance costs increase and component lifespan becomes unpredictable

Engineering Contradiction:

Improvemaintenance planning complexityVSAvoidcomponent lifespan predictability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The system implements feedback by continuously monitoring oxidation catalyst exposure events through conductivity sensors and using this information to dynamically adjust maintenance scheduling. The processor receives conductivity signals, determines exposure events, and uses this feedback loop to predict component remaining useful life, replacing fixed-time maintenance with condition-based maintenance that responds to actual component degradation conditions.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If fixed-time maintenance intervals are implemented, then maintenance scheduling is easier, but maintenance costs increase due to unnecessary replacements

Engineering Contradiction:

Improvemaintenance scheduling easeVSAvoidmaintenance cost

Core Design Contradiction:

Ease of operationVSLoss of energy

Solution Approach 1:

The system enables self-service by allowing the component to monitor its own exposure conditions through integrated conductivity sensors. The component autonomously tracks oxidation catalyst exposure events and uses this self-collected data to predict its own remaining useful life, eliminating the need for external inspection and enabling precise, cost-effective maintenance timing that avoids unnecessary replacements.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system performs preliminary action by continuously accumulating exposure event data and predicting remaining useful life before actual component failure occurs. This advance prediction allows maintenance to be scheduled at the optimal moment - just before degradation becomes critical - preventing both premature replacement and failure-related downtime costs.

Inventive Principle:

Principle #10Preliminary action

3Device complexity

If oxidation catalyst exposure is not monitored, then the system structure remains simple, but component lifespan prediction becomes inaccurate

Engineering Contradiction:

Improvedetection system complexityVSAvoidlifespan prediction accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system replaces mechanical or visual inspection methods with electrical conductivity-based detection. Conductivity sensors electronically monitor oxidation catalyst exposure by measuring changes in electrical conductivity of the deicing fluid, providing precise, automated detection that substitutes for complex mechanical monitoring systems while accurately tracking exposure events that affect component lifespan.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

The system effectively predicts the useful life of aircraft components and associates maintenance costs with specific braking events, enabling more accurate cost analysis and proactive maintenance planning.

Implementation Method 1

an electrical conductivity sensor is configured and positioned to generate a signal indicative of electrical conductivity of a substance to which the aircraft component is exposed

Methodology Applied

Scientific EffectElectrical conductivity: Conduction (electrical)

Data Source

PatentEP2988120B1Conductivity sensor for aircraft components and method for detceting conductivity

Publication Date: 2018.03.28 HONEYWELL INTERNATIONAL INC

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AI summary

The exposure of an aircraft component to an oxidation catalyst, such as a deicing solution, may be detected with the aid of an electrical conductivity sensor. In some examples, a system includes an aircraft component, an electrical conductivity sensor mechanically connected to the aircraft component and configured to generate an output, and a processor configured to detect an oxidation catalyst exposure event based on the output generated by the electrical conductivity sensor. The electrical conductivity sensor may be configured and positioned to generate a signal indicative of electrical conductivity of a substance to which the aircraft component is exposed. The processor may be configured to detect an oxidation catalyst exposure event by at least determining whether the electrical conductivity indicated by the signal is greater than or equal to a predetermined conductivity threshold value.