Flight Recorder Memory Core Vacuum Isolation for Crash Heat Survival
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Solution Overview
Problem
Current flight recorder systems face challenges in surviving temperature tests due to the limitations of large commercial memories, which struggle to meet regulatory requirements for crash survivability and temperature extremes.
Innovation Solution
The implementation of a vacuum-protected memory system where the memory core is housed in an inner chamber within an outer chamber, with a vacuum separating the two, and a hermetically sealed relay provides heat flow path isolation, allowing for the use of higher capacity memory technologies and reducing heat conduction and convection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large commercial memories are used to increase memory capacity, then memory capacity is improved, but temperature test survival capability deteriorates
Solution Approach 1:
The memory system is divided into two separate chambers: an inner chamber housing the memory core and an outer chamber providing thermal protection. This segmentation allows the memory capacity to be increased using commercial components while the outer chamber compensates for their reduced temperature test survival capability by providing thermal isolation.
Solution Approach 2:
A vacuum environment is introduced as an intermediary between the inner and outer chambers to eliminate heat conduction and convection pathways. This vacuum barrier protects the high-capacity memory core from extreme temperature conditions, enabling the use of larger memories that would otherwise fail temperature tests.
2Device complexity
If conventional memory housing is used, then device complexity is reduced, but heat flow isolation capability deteriorates
Solution Approach 1:
The harmful heat flow pathways are extracted from the system by removing air and other gases from the chamber between the memory core housing and the outer protective chamber. This creates a vacuum environment that eliminates conductive and convective heat transfer, providing thermal protection without requiring complex active cooling or insulation systems.
3Ease of operation
If direct connection to memory core is maintained, then ease of operation is improved, but thermal protection capability deteriorates
Solution Approach 1:
The direct mechanical and thermal connection to the memory core is replaced with a vacuum-isolated connection system. Power and data connections pass through the vacuum barrier via feedthroughs that maintain electrical connectivity while blocking thermal energy transfer, thus preserving ease of operation while achieving thermal protection.
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 solution enables flight recorders to withstand temperature extremes, ensuring the survival of memory technologies during crashes and allowing for increased memory capacity while maintaining data integrity.
Implementation Method 1
an outer chamber housing the inner chamber with a vacuum between the inner chamber and the outer chamber
Implementation Method 2
reducing heat conduction and convection
Data Source
AI summary
Various systems may benefit from appropriate thermal protection. For example, various flight recorder systems may benefit from thermal isolation of a flight recorder memory core. A system can include a memory core of a flight recorder. The system can also include an inner chamber housing the memory core. The system can further include an outer chamber housing the inner chamber with a vacuum between the inner chamber and the outer chamber. The system can additionally include a signal path from avionics equipment to the memory core through the outer chamber and the inner chamber. The system can also include a power path for the memory core through the outer chamber and the inner chamber.