Inclining Curved Ejection Seat Rail Mechanism
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Solution Overview
Problem
Modern aircraft ejection systems face challenges in safely and practically ejecting crewmembers from reclined or supine positions due to the hazardous and impractical nature of highly reclined seats when transitioning from a reclined to an upright position during emergency evacuations.
Innovation Solution
The development of an inclining aircraft ejection seat assembly that utilizes a curved or multi-curved ejection rail system with guides, allowing the seat to transition from a reclined to an inclined position prior to ejection, enabling a more effective ejection posture by adjusting the seat angle from approximately 10-70° to 70-90° relative to the horizontal plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the ejection seat is positioned in a reclined position (10-70°) for crew comfort during flight, then crewmember comfort is improved, but the ejection process becomes hazardous and impractical
Solution Approach 1:
The ejection seat is designed with dynamic repositioning capability, allowing it to transition from a static reclined position to an inclined ejection position. The curved ejection rail enables the seat to dynamically change its orientation during the ejection sequence, optimizing both comfort during flight and safety during ejection.
Solution Approach 2:
The system performs preliminary repositioning of the ejection seat to an inclined position (70-90°) before the actual ejection occurs. This preliminary action ensures the seat is in the optimal configuration for safe ejection while maintaining the comfort benefits of the reclined position during normal flight operations.
2Productivity
If the ejection seat maintains a reclined position for extended flight operations, then operational efficiency is improved, but the ejection trajectory becomes hazardous
Solution Approach 1:
The ejection seat incorporates dynamic position adjustment capability through curved ejection rails, allowing it to transition from a reclined operational position to an inclined ejection position. This dynamic reconfiguration eliminates ejection hazards while maintaining operational efficiency during flight.
Solution Approach 2:
The system changes the orientation parameter of the ejection seat from a reclined angle (10-70°) to an inclined angle (70-90°) specifically during the ejection phase. This parameter change ensures safe ejection trajectory while allowing the seat to maintain comfortable reclined positions during normal flight operations.
3Device complexity
If the ejection rail is designed as a straight rail for simplicity, then device complexity is reduced, but the seat cannot transition from reclined to inclined position
Solution Approach 1:
The ejection rail is designed with a curved geometry instead of a straight configuration. This curvature enables the ejection seat to transition smoothly from a reclined position to an inclined position during ejection, providing the necessary adaptability while maintaining relatively simple rail structure.
Solution Approach 2:
The ejection rail introduces a curved path that adds dimensional complexity to the ejection trajectory. Instead of a linear one-dimensional movement, the curved rail enables two-dimensional motion, allowing the seat to change both position and orientation during ejection.
Data Source
AI summary
An inclining aircraft ejection seat assembly includes a curved ejection rail and an ejection seat having a guide disposed on a side of the ejection seat configured to travel along an arcuate path in mating alignment with the curved ejection rail and change a configuration of the ejection seat from a reclining position to an inclining position prior to ejection.