Design and Simulation Analysis of the Silencing Structure of a Direct Gunpowder Nail Fixer
In response to the problem of excessive muzzle noise during the nail shooting process of the direct gunpowder nail fixing device,a perforated silencing structure has been designed inside it.Based on the joint simulation of LS-DYNA and Fluent,we analyzed the impact of the aperture and hole spacing of the silencing structure on the nail power and muzzle noise.In LS-DYNA,ALE fluid solid coupling algorithm is selected based on detonation theory.The process of explosive penetration into the target plate was simulated during the explosion of the nail in the bore,and the influence of aperture and hole spacing on the power of the nail shooting was analyzed.Extracting the pressure value in the chamber at the moment of explosion as the initial pressure value for muzzle noise analysis,using the velocity of the nail penetrating the target plate as the boundary condition,the flow field and noise during the nail shooting process was analyzed with Fluent software based on dynamic grid technology.The results were compared with the noise test results.The results show that as the aperture increases,the penetration depth decreases approximately linearly.As the hole spacing increases,the penetration depth decreases nonlinearly as it approaches the center of the explosion.On the premise of ensuring power,the total noise pressure level is 109.1dB when the aperture is 1.75mm and the hole spacing is 23mm,10％lower than that without silencing structure.
gunpowder nail fixing devicesilencing structurenail shooting powermuzzle noise
万方数据
维普
