Effect of the Same Sized Holes with Different Geometries and Angles in the Gun Silencer Diffusers on the Acoustic Power Level

Öz

The bullet, which is activated by the firing of the gunpowder in the gun silencer, comes out of the gun's barrel. In the meantime, an irritating muzzle blast sound is heard that lasts for a few milliseconds. With this explosion, acoustic sound waves are formed that are independent of the bullet's path of motion. In this study, a silencer that can be attached to a low-power 9 mm firearm is modeled. Afterward, the impact of holes with the same area drilled in different geometries and angles on the diffusers (compartments) of the silencer are compared. The Computational Fluid Dynamics (CFD) analysis method is used for this comparison. In addition, the dynamic mesh model is used where the ballistic field changes over time. This mesh model is analyzed for imperforate, circular-holed, square-holed, and triangular-holed profiles with the same area. Depending on the analyses, the pressure, velocity, and dB results obtained for the silencer outlet area are compared with each other.

Anahtar Kelimeler

• Silencer diffusers
• Acoustic power
• CFD analysis

Kaynakça

1. Soysal, Y. (2004). “Ateşli silahlarla susturucu kullanımının atış artıklarına etkileri” İstanbul University, Institute of Forensic Medicine, Master's Thesis. İstanbul, 41-62.
2. Mutlum Z. (2018). “Düz perdeli susturucularda perde sayısı ve konumlarının ses düşümüne etkisinin araştırılması”, Kırıkkale University, Master's Thesis. Kırıkkale, 70-97.
3. Özkan, Y., Özsert, İ., Ayhan, V. and Cesur, İ. (2016). “Reaktif tip susturucunun iç tasarımının akış ve akustik özelliklerine etkisinin incelenmesi”, Sakarya University Journal of Science, 20(1), 65-74.
4. Zengin, E. (2010). “Susturucu İçerisindeki Akışın Modellenmesi”, İstanbul Teknik University, Phd Thesis, İstanbul, 30-53.
5. Arslan, H., Ranjbar, M., Secgin, E. and Celik, V. (2020). “Theoretical and experimental investigation of acoustic performance of multi-chamber reactive silencers”, Applied Acoustics, 157.
6. Everest, F. A. (2001). “Master handbook of acoustics”, McGraw-Hill Education Publisher, Diffusion(125-135), New York.
7. Möser, M. (2004). “Engineering acoustics: An introduction to noise control”, The Journal of the Acoustical Society of America, 116(5), 2707-2708.
8. Bozdemir, M. (2019). “Havalı silah sistemleri için tek parçalı susturucu tasarımı”, Journal of Defense Sciences, 18(1), 55-73.

9. https://tr.wikipedia.org/wiki/Ateşli_silahlar, (2020)
10. Gezer, H. A. and Engin T. (2016). “Barut tane geometrisinin silah iç balistiğine etkisinin incelenmesi” Sakarya University Journal of Science, 20(2), 251-257.
11. Freytag, J. C., Begault D. R. and Peltier, C. A. (2006). “The acoustics of gunfire, in inter-noise and noise-con”, Institute of Noise Control Engineering, 6, 1165-1174.
12. Seçgin, E. (2014). “Patlamalı akışlarda akustik indirgeme ve performans analizi”, Kırıkkale University, Phd Thesis. Kırıkkale, 28-67.
13. Randall, F. B. (2003). “Industrial noise control and acoustics”, Louisiana Technical University, Ruston.
14. Maher, R. C. (2007). “Acoustical characterization of gunshots”, IEEE Workshop on Signal Processing Applications for Public Security and Forensics, 1-5.
15. Ranjbar, M., Hardtke H. J., Fritze D. and Marburg, S. (2010). “Finding the best design within limited time: a comparative case study on methods for optimization in structural acoustics” Journal of Computational Acoustics, 18(02), 149-164.
16. Paulson, A. C., Parker N. R. and Peter G. K. (2002). “Silencer history and performance”, Assault Riffle and Sniper Technology, 2, 72-115.
17. http://www.closefocusresearch.com/calculating-barrel-pressure-and-projectile-velocity-gun-systems, (2021).