Sacrificial Wire for Air Data Probe Heater Health Indication
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Solution Overview
Problem
Heater elements in air data probes suffer from unpredictable fatigue and thermo-mechanical degradation, leading to unexpected downtime due to their failure, which is difficult to predict and manage.
Innovation Solution
A multi-function probe wire de-icing apparatus is introduced, featuring a sacrificial wire collocated with the main heater wire, designed to fail before the main wire, providing an indication of the main heater wire's lifespan and allowing for timely replacement, thus preventing system downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a main heater wire is used to prevent ice buildup, then the air data probe can operate in cold environments, but the heater wire suffers unpredictable fatigue and degradation leading to unexpected failure
Solution Approach 1:
A sacrificial wire is installed alongside the main heater wire and designed to fail first, providing advance warning before the main heater wire fails. This preliminary failure action allows maintenance to be scheduled proactively, preventing unexpected system downtime.
Solution Approach 2:
The sacrificial wire is designed as a consumable component with shorter lifespan than the main heater wire. It serves as a disposable indicator that degrades and fails first, providing warning while the main heater wire remains functional, allowing planned replacement rather than emergency repair.
2Measurement precision
If heater wire degradation is monitored, then failure can be predicted, but the monitoring system increases device complexity
Solution Approach 1:
The sacrificial wire acts as an intermediary indicator between the actual heater wire degradation and the monitoring system. Instead of directly monitoring the main heater wire's complex degradation processes, the system monitors the simpler failure state of the sacrificial wire, which provides proportional warning.
Solution Approach 2:
The sacrificial wire incorporates visual indicators such as color changes or physical markers that indicate its degradation state and failure. This allows direct visual monitoring without complex electronic sensors, reducing system complexity while maintaining measurement capability.
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 sacrificial wire system allows for predictable and proactive replacement of the main heater wire, reducing downtime and ensuring continuous system operation by indicating impending failure through monitored degradation, thereby maintaining the integrity of air data probe functionality.
Implementation Method 1
heater elements may suffer fatigue and thermo-mechanical degradation over time, depending on various operating parameters
Implementation Method 2
Integrated heater elements prevent ice buildup during cold operating environments
Data Source
AI summary
A multi-function probe wire de-icing apparatus is described. The multi-function probe wire de-icing apparatus may include a multi-function probe wire, a main heater wire collocated with the multi-function probe wire, and a sacrificial wire deposed adjacent to the main heater wire. The sacrificial wire is configured to fail prior to the main heater wire failing.