Vacuum-Isolated Flight Recorder Memory for Fire Test Survival
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Solution Overview
Problem
Existing flight recorder systems face challenges in surviving temperature tests required by regulations, particularly with large commercial memories that struggle to pass temperature testing.
Innovation Solution
The implementation of a vacuum protected memory system, where memory electronics are housed in an inner core surrounded by an outer core with a vacuum separation in between, effectively isolating heat conduction and convection, and reducing radiated heat using reflective techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If large commercial memory capacities are used to support multiple long duration voice and video channels, then the memory capacity increases, but the ability to pass temperature testing deteriorates
Solution Approach 1:
The memory system is divided into two separate chambers: an inner chamber housing the memory electronics and an outer chamber providing thermal protection. This segmentation allows the memory capacity to be increased while the outer chamber independently provides temperature test survival capability.
Solution Approach 2:
A vacuum sealed space is introduced as an intermediary between the inner and outer chambers. This vacuum barrier acts as a thermal insulator, blocking heat transfer from the outer environment to the memory electronics, thereby enabling both high capacity and temperature test survival.
2Device complexity
If traditional memory housing is used, then the device complexity remains low, but the thermal protection capability deteriorates
Solution Approach 1:
The inner chamber containing memory electronics is nested within the outer chamber providing thermal protection. This nested structure provides robust temperature extreme protection while maintaining a compact form factor and acceptable device complexity.
Solution Approach 2:
A vacuum environment is created between the inner and outer chambers, replacing air with an inert vacuum. This eliminates convective heat transfer and significantly reduces conductive and radiative heat transfer, providing effective thermal protection without adding complex active cooling systems.
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 allows for the use of higher capacity memory technologies that do not currently survive fire tests, providing reliable memory protection from temperature extremes and enabling the support of multiple long duration voice and video channels and other data.
Implementation Method 1
a vacuum separating the two cores
Implementation Method 2
vacuum as an insulating medium
Implementation Method 3
reducing radiated heat using reflective techniques
Data Source
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AI summary
Various systems may benefit from appropriate thermal protection. For example, various flight recorder systems may benefit from a vacuum protected flight recorder memory. 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.