Marking Cartridge Venting Assembly for Multi-Phase Firing Control
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Solution Overview
Problem
Existing reduced-energy marking cartridges lack precise control over the firing cycle, leading to inconsistent performance and incomplete ejection, which affects the reliability and realism of non-lethal training simulations.
Innovation Solution
A multi-phase firing cycle is implemented in the reduced-energy marking cartridge, utilizing a sabot and casing configuration with seals and venting passages that control the flow of combustion gas through distinct chambers to achieve precise propulsion and ejection, including a combustion phase, firing phase, and venting phase, enhancing manufacturing simplicity and performance consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reduced-energy marking cartridges are used for non-lethal training, then safety and realism are improved, but precise control over the firing cycle and consistent performance deteriorate
Solution Approach 1:
The firing cycle is divided into distinct phases (combustion phase, expansion phase, venting phase) with specific chamber configurations for each phase. The combustion chamber, expansion chamber, and venting chamber are segmented to provide controlled gas flow at different stages, enabling precise performance control without overly complex mechanisms.
Solution Approach 2:
The sabot is designed with movable seals that dynamically transition between different positions during the firing cycle. The seals move from initially sealing the combustion chamber to later sealing the expansion chamber, automatically adapting the gas flow paths based on the phase of firing without requiring external control mechanisms.
2Speed
If combustion gas is contained to propel the projectile, then propulsion efficiency is improved, but complete cartridge ejection deteriorates
Solution Approach 1:
The firing cycle incorporates periodic action with distinct phases: initially containing combustion gas for propulsion, then transitioning to venting gas for ejection. The multi-chamber design enables this periodic transition, first propelling the projectile with contained pressure, then reliably ejecting the cartridge case through controlled gas venting in the expansion chamber.
Solution Approach 2:
The expansion chamber serves as an intermediary between the combustion chamber and the external environment. It receives combustion gas after projectile propulsion, then uses this gas to drive complete cartridge ejection, mediating the transition from propulsion function to ejection function and ensuring both objectives are achieved.
3Manufacturing precision
If seals and venting passages are configured for precise gas flow control, then firing phase control is improved, but manufacturing complexity increases
Solution Approach 1:
Multiple functions are merged into the sabot structure: it contains the combustion chamber, expansion chamber, and venting chamber configurations, while also housing the movable seals. This integration achieves precise firing phase control through a single component rather than multiple separate parts, simplifying the manufacturing process while maintaining precision.
Solution Approach 2:
The seals are designed to automatically position themselves during the firing cycle based on pressure differentials and mechanical movement of the sabot. This self-positioning mechanism eliminates the need for complex external actuation systems, reducing manufacturing complexity while maintaining precise control over gas flow timing and phase transitions.
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 multi-phase firing cycle provides consistent bullet velocity and reliable cartridge ejection, improving the realism and reliability of non-lethal training simulations by ensuring complete and repeatable case ejection.
Implementation Method 1
A propellant disposed in the aft portion of the casing is ignitable to produce a combustion gas
Implementation Method 2
the first seal disengages the aft portion and fluid communication is established from the combustion chamber for pressurizing the acceleration chamber to propel the projectile
Implementation Method 3
the combustion chamber is in fluid communication with the acceleration chamber through the venting chamber for expelling combustion gas from the casing
Data Source
AI summary
A reduced energy marking cartridge includes a casing supporting a sabot for relative sliding movement and defining a combustion chamber at the breech end of the cartridge and a vent chamber at the muzzle end of the cartridge. An assembly of seals and venting passages in the sabot, which may be in the form of notches, slots or holes, cooperate during the relative movement of the casing and sabot to provide a valving mechanism for controlling the flow of combustion gas from the combustion chamber through the venting chamber and into the acceleration chamber for propelling a projectile from the cartridge.