Non-Electric Initiator Squib Mechanical Puncture
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Solution Overview
Problem
Existing pyrotechnic initiators for Anti-Personnel Obstacle Breaching Systems (APOBS) rely solely on pyrotechnic events for both rupturing the initiator sleeve and igniting the rocket motor, leading to unreliable and inconsistent ignition, especially in hostile environments.
Innovation Solution
A non-electric initiator with a squib assembly that mechanically punctures the base of the rocket motor's initiator sleeve using a slider member with a pyrotechnic charge, separating the shock tube from the squib assembly before ignition, ensuring reliable and consistent ignition of the rocket motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pyrotechnic initiator relies solely on pyrotechnic events to rupture the initiator sleeve and ignite the rocket motor, then the device complexity is reduced, but the reliability and consistency of ignition deteriorates
Solution Approach 1:
The initiator is divided into two independent functional components: a mechanical puncture mechanism (slider member with spike) and a pyrotechnic ignition system. The mechanical component physically ruptures the initiator sleeve while the pyrotechnic component provides the ignition source, separating these two functions that were previously combined in a single pyrotechnic event.
Solution Approach 2:
The slider member is positioned in advance within the squib assembly, ready to mechanically puncture the initiator sleeve base. This preliminary mechanical action prepares the system by creating a breach in the initiator sleeve before pyrotechnic ignition occurs, ensuring that the ignition path is already established when the pyrotechnic charge fires.
2Device complexity
If a pyrotechnic event is used to both rupture the initiator sleeve and ignite the rocket motor, then the device complexity is minimized, but the manufacturing precision and consistency of operation worsens
Solution Approach 1:
The initiator system is segmented into distinct mechanical and pyrotechnic subsystems, each optimized for its specific function. The slider member assembly is precisely manufactured to ensure consistent mechanical puncture, while the pyrotechnic charge is separately configured for reliable ignition, allowing each component to be manufactured and tested independently for optimal performance.
Solution Approach 2:
The mechanical puncture action serves as an intermediary step between the initiator activation and the pyrotechnic ignition. By introducing this intermediate mechanical action that physically breaches the initiator sleeve, the system ensures a consistent and reliable ignition path is created before the pyrotechnic charge is discharged, improving overall ignition consistency.
3Device complexity
If the shock tube remains connected to the squib assembly during ignition, then the device complexity is reduced, but the reliability of ignition deteriorates due to potential interference
Solution Approach 1:
The shock tube is extracted or separated from the squib assembly, removing it from the ignition path. This extraction eliminates potential interference from the shock tube structure during the pyrotechnic ignition event, allowing the pyrotechnic charge to fire unimpeded through the mechanically created breach in the initiator sleeve.
Solution Approach 2:
The mechanical puncture action is performed in advance to create the ignition path before pyrotechnic ignition occurs. This preliminary mechanical preparation ensures that when the pyrotechnic charge fires, the ignition path is already established and clear of obstructions such as the shock tube, improving ignition reliability.
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 non-electric initiator provides reliable and consistent ignition of APOBS rocket motors from a safe distance, improving reliability by mechanically perforating the initiator sleeve before pyrotechnic ignition, thus reducing variability in ignition and maintaining output charge energy.
Implementation Method 1
a slider member with a pyrotechnic charge, separating the shock tube from the squib assembly before ignition
Data Source
AI summary
A squib assembly for a non-electric initiator of an anti-personnel obstacle breaching system includes a housing configured to connect to the igniter of a rocket motor of the anti-personnel obstacle breaching system, a slider assembly slidably contained within the housing and configured to connect to a shock tube of the non-electric initiator, and a pyrotechnic element disposed within the housing. Upon activation of the non-electric initiator, the squib assembly is configured to mechanically puncture a base of a initiator sleeve of the rocket motor and to thermally initiate ignition of the rocket motor.