Parachute Neck Restraint System for Pilot Injury Prevention
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Solution Overview
Problem
Ejection seat pilots face a risk of neck hyperextension and injury due to sudden orientation changes during parachute deployment, as the canopy's force causes the pilot's head to be rearwardly rotated.
Innovation Solution
A neck protection system comprising a head restraint, upper and lower straps, and pull cords, which adjust to increase tension and limit rearward head movement by forming loops with the parachute risers, utilizing elastic materials and releasable restraints to enhance stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the canopy deploys to slow the pilot, then the pilot's descent speed is reduced, but the pilot's neck may hyperextend due to sudden orientation changes
Solution Approach 1:
The head restraint is deployed before the canopy fully inflates to counteract the rearward force that will be applied to the pilot's head. The restraint applies an opposing force in advance to prevent neck hyperextension when the canopy deployment force acts on the pilot.
Solution Approach 2:
The head restraint acts as an intermediary device between the canopy and the pilot's head. It absorbs and distributes the rearward force generated by canopy deployment, preventing direct transmission of this force to the pilot's neck.
2Stability of the object's composition
If the head restraint is made rigid to limit head movement, then neck stability is improved, but comfort and adaptability are reduced
Solution Approach 1:
The head restraint transitions from a relaxed state during ejection to a taut, stabilizing state during canopy deployment. This dynamic adjustment provides head stability when needed while maintaining comfort during other phases of descent.
Solution Approach 2:
The restraint's tension parameter changes based on deployment phase. During ejection, the restraint is loose to allow comfort and head movement. During canopy deployment, the restraint becomes taut to provide head stability and prevent neck injury.
3Ease of operation
If the restraint straps are made elastic to allow adjustment, then comfort is improved, but the ability to constrain head movement is reduced
Solution Approach 1:
The elastic straps dynamically adjust their stiffness based on the deployment phase. During ejection, the elastic material allows movement and adjustment for comfort. During canopy deployment, the elastic straps become taut and provide sufficient constraining force to prevent neck injury.
Solution Approach 2:
The mechanical properties of the restraint straps change from a compliant, adjustable state to a rigid, constraining state in response to the deployment forces. The elastic material's effective stiffness increases when subjected to the rearward force of canopy deployment.
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 neck protection system effectively reduces the likelihood of neck injuries by maintaining head stability during parachute deployment and allowing for comfortable adjustment post-deployment.
Implementation Method 1
the head restraint may comprise an elastic material
Data Source
AI summary
A neck protection system for a parachute assembly may comprise a head restraint, a first upper strap coupled to a first side of the head restraint, and a second upper strap coupled to a second, opposing side the head restraint. A first lower strap may be coupled to the first side of the head restraint. A second lower strap may be coupled to the second side of the head restraint. A first pull cord may be coupled to the first upper strap. A second pull cord may be coupled to the second upper strap.