Pyrotechnic Drogue Bridle Separation for Aramid Severance
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Solution Overview
Problem
Current drogue severance cutters in ejection seats are not certified to cut aramid fiber materials, and the manufacturing and installation of severance cutters are time-consuming and labor-intensive processes.
Innovation Solution
A drogue bridle separation assembly using a pyrotechnic fastener with an exothermic reaction charge, which severs in multiple regions to release the drogue parachute from the ejection seat, simplifying the housing design and reducing certification and installation complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional severance cutter is used to release the drogue bridle, then the drogue parachute can be released from the ejection seat, but the cutter cannot be certified to sever aramid fiber materials and requires complex housing and installation processes
Solution Approach 1:
The patent replaces the traditional mechanical severance cutter with a pyrotechnic fastener that uses chemical energy (exothermic reaction) to sever the drogue bridle. This substitution eliminates the need for complex mechanical cutting mechanisms and housing structures, while providing reliable severance of aramid fiber materials through the pyrotechnic charge.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical force (cutter) to thermal/chemical energy (pyrotechnic fastener). This parameter change enables the system to sever difficult-to-cut materials like aramid fiber while simplifying the overall device structure and installation requirements.
2Reliability
If a traditional severance cutter is used, then the drogue bridle can be severed, but the manufacturing and installation processes are time-consuming and labor intensive
Solution Approach 1:
By replacing the mechanical cutter system with a pyrotechnic fastener, the patent eliminates complex manufacturing and installation procedures. The pyrotechnic fastener can be directly integrated into the bridle assembly with minimal additional components, significantly reducing manufacturing time and labor requirements while maintaining reliable severance functionality.
3Adaptability or versatility
If a pyrotechnic fastener is used, then the drogue parachute can be released regardless of material type and installation is simplified, but an exothermic reaction charge is required
Solution Approach 1:
The patent adopts a pyrotechnic fastener that uses exothermic chemical reactions to generate the necessary energy for severing various materials including aramid fiber. This approach provides universal material compatibility while the charge quantity is optimized to be minimal - only sufficient to heat and sever the bridle material, rather than requiring large amounts of material as in mechanical cutting 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
The pyrotechnic fastener effectively releases the drogue parachute from the ejection seat, regardless of the material type, reducing manufacturing and installation time, and eliminating the need for certified severance cutters, thus enhancing the efficiency and cost-effectiveness of the parachute deployment system.
Implementation Method 1
The pyrotechnic fastener includes a charge configured to undergo an exothermic reaction in response to an electrical signal
Data Source
AI summary
A drogue bridle separation assembly may comprise a housing and a pyrotechnic fastener. The housing may define a riser channel and a fastener opening. The pyrotechnic fastener may be configured to extend through the fastener opening and the riser channel. The pyrotechnic fastener includes a charge configured to undergo an exothermic reaction in response to an electrical signal.