Recoilless Weapon Breech Venturi Noise Reduction
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Solution Overview
Problem
Existing recoil-less weapons face high noise levels due to the sudden release of high-pressure exhaust gases, which current solutions fail to adequately address without compromising recoil characteristics.
Innovation Solution
A breech with a venturi tube and exhaust gas controlling elements, such as porous bodies or teeth, that progressively release high-pressure gas to increase gas stream velocity and reduce sound pressure peaks, maintaining recoil performance while minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional breech is used to release exhaust gases, then the recoil is reduced, but the noise level becomes very high due to sudden gas release
Solution Approach 1:
The exhaust gas release is segmented in time through the progressive opening mechanism (teeth or porous body) that releases gas in successive portions rather than all at once, reducing the peak sound pressure while maintaining total gas release for recoil balance
Solution Approach 2:
A porous body is used as the exhaust gas controlling element to progressively release high pressure gas through its porous structure, controlling the gas release rate to reduce sound pressure peaks while maintaining recoil characteristics
2Object-affected harmful factors
If the gas release is controlled to reduce noise, then the sound pressure peak decreases, but the recoil characteristics may be adversely affected
Solution Approach 1:
The pressure release parameters are changed by using a progressive opening mechanism that controls the timing and rate of gas release, allowing the sound pressure peak to be reduced while the total impulse is maintained to preserve recoil characteristics
Solution Approach 2:
The exhaust gas is released in periodic successive portions through the progressive opening mechanism, creating a controlled periodic release pattern that reduces peak noise while maintaining overall gas release for recoil balance
3Speed
If a venturi tube with area expansion is used, then the gas stream velocity increases, but the device complexity increases
Solution Approach 1:
The venturi tube is merged with the progressive opening mechanism and exhaust gas controlling element into a single integrated breech structure, reducing overall device complexity while maintaining the velocity increase benefit from the area expansion
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 solution effectively reduces noise levels and maintains recoil characteristics by increasing gas stream velocity and using geometric designs for destructive interference, improving the operating environment for operators without adverse effects on the weapon's inner ballistics.
Implementation Method 1
The area of the outlet is larger than the area of the inlet. The effect of this is that the velocity of the gas stream is increased in the direction of the area expansion, i.e. the main flow direction, due to a gas flow cross section increase/expansion
Implementation Method 2
The exhaust gas controlling element is arranged to control the release of exhaust gas so as to decrease a sound pressure peak at the weapon
Data Source
Figure 1~2f
Figure 3a~6b
Figure 7a~8
AI summary
The present disclosure relates to a breech (103) for noise reduction in a recoil-less weapon (100). The breech (103) is adapted to be arranged in fluid communication with a launcher (102) of the weapon (100) to release exhaust gas. The breech (103) comprises a venturi tube. The venturi tube has an inlet at a first end adapted to be connected to the launcher, and an outlet for releasing the exhaust gas at a second end, wherein the area of the outlet is larger than the area of the inlet. The venturi tube further comprises an exhaust gas controlling element formed at the venturi tube structure. The exhaust gas controlling element is arranged to control the release of exhaust gas so as to decrease a sound pressure peak at the weapon. The inner envelope surface of the venturi tube is configured, such that the inner envelope surface does not alter or at least has a very small influence on recoil characteristics of the weapon. The present disclosure also relates to recoil-less weapons comprising a breech according to the present disclosure, as well as methods for manufacturing a breech according to the present disclosure.