Experimental and numerical investigations on the shock wave attenuation performance of blast walls with a canopy on top

Xiao, Weifang; Andrae, Matthias; Gebbeken, Norbert

doi:10.1016/j.ijimpeng.2019.05.009

Cited by 18 publications

(10 citation statements)

References 8 publications

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“…Helliker and other scientists [16,27,[36][37][38][39][40][41][42] investigated many different muzzle devices including a silencer. The outputs of the models were not verified against experimental test data from muzzle blasts, which differ to conventional blast waves [43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 92%

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

et al. 2020

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In this paper, a mathematical model for projectiles shooting in any direction based on sensors distributed stereoscopically is put forward. It is based on the characteristics of a shock wave around a supersonic projectile and acoustical localization. Wave equations for an acoustic monopole point source of a directed effect used for physical interpretation of pressure as an acoustic phenomenon. Simulation and measurements of novel versatile mechanical and acoustical damping system (silencer), which has both a muzzle break and silencer properties studied in this paper. The use of the proposed damping system can have great influence on the acoustic pressure field intensity from the shooter. A silencer regarded as an acoustic transducer and multi-holes waveguide with a chamber. Wave equations for an acoustic monopole point source of a directed effect used for the physical interpretation of pressure as an acoustic phenomenon. The numerical simulation results of the silencer with different configurations presented allow trends to be established. A measurement chain was used to compare the simulation results with the experimental ones. The modeling and experimental results showed an increase in silencer chamber volume results in a reduction of recorded pressure within the silencer chamber.

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Section: Introductionmentioning

confidence: 92%

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

et al. 2020

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“…Recently, Xiao et al (2019) extended this work to understand the role of the canopy angle. Experiments were carried out using a 3.9 kg PETN charge, placed at the centre of a 10 m diameter circle (on plan), 0.4 m above ground level.…”

Section: Indirect Loading: Barriersmentioning

confidence: 98%

“…While frangible walls can cause harm to people in the surroundings due to fragmentation, the use of water-filled ‘walls’ can avoid such a scenario. This shows how barriers can mitigate a blast wave by reflection, diffraction or even absorption of energy (Xiao et al, 2019). A summary of these and related work in the recent period, and details on the construction of barriers may be found in the review by Smith (2010).…”

Section: Indirect Loading: Barriersmentioning

confidence: 99%

“…Further, due to the presence of a barrier, a diffracted wave arises from each free edge of the barrier, and these diffracted waves further weaken the transmitted wave. In this context, research on the effect of the height of the barrier, the distance behind the barrier where shielding occurs and the role of a canopy placed over this edge have been undertaken (Beyer, 1986; Xiao et al, 2019). The thickness of the wall (Sha et al, 2014), referring to the breadth in Figure 15; the detrimental effect of increasing height of burst (HoB) (Chapman et al, 1995b); the inclination of the face of the barriers (Sugiyama et al, 2015); the structural integrity of the wall (Rose et al, 1998) and even a not so obvious aspect such as the roughness of the barrier (Hajek et al, 2016) all play a role in weakening the wave transmitted beyond the barrier.…”

Section: Introductionmentioning

confidence: 99%

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Blast wave interaction with structures – An overview

Isaac

Alshammari

Pickering

et al. 2022

International Journal of Protective Structures

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Blast–obstacle interaction is a complex, multi-faceted problem. Whilst engineering-level tools exist for predicting blast parameters (e.g. peak pressure, impulse and loading duration) in geometrically simple settings, a blast wave is fundamentally altered upon interaction with an object in its path, and hence, the loading parameters are themselves affected. This article presents a comprehensive review of key research in this area. The review is formed of five main parts, each describing: the direct loading of a blast wave on the surface of a finite-sized structure; the modified pressure of the blast wave in the wake region of three main obstacle types – blast walls, obstacles, wall/obstacle hybrids; and finally, a brief description of some methods for predicting loading parameters in such blast–obstacle interaction settings. Key findings relate to the mechanisms governing blast attenuation, for example, diffraction, reflection (diverting away from the target structure), expansion/volume increase, vortex creation/growth, as well as obstacle properties influencing these, such as porosity (blockage ratio), obstacle shape, number of obstacles/rows, arrangement and surface roughness.

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“…Das untersuchte Szenario wird dabei nicht verändert (W = 3,9 kg PETN, Abstand von der Ladung zur Schutzwand R 1 = 5 m und Abstand von der Schutzwand zur betrachteten Fassade R 2 = 4 m). Für das Szenario ist gemäß[14], ab einer Wandlänge von 7 m, der Einfluss der seitlichen Umströ mung der Schutzwand vernachlässigbar.…”

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Untersuchung der Schutzwirkung von auf Gabionenwänden montierten Leitblechen gegen Explosionen

2020

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In diesem Aufsatz werden experimentelle und numerische Untersuchungen zur Minderung von Explosionslasten auf Gebäude und Menschen durch verschiedene Konfigurationen einer Schutzwand vorgestellt. Die Wandkonstruktion besteht aus einer Gabionenwand mit einem aufgesetzten Leitblech, das mit unterschiedlichen Neigungswinkeln angeordnet wird. Für jede Testkonfiguration wurden drei Versuche durchgeführt. Numerische Modelle wurden entwickelt und anhand der Versuchsdaten validiert. Aus Kosten‐ und Platzgründen wurden Schutzwände mit einer geringen Breite von 2 m in den Versuchen untersucht. Hinter der Wand kommt es hierdurch zur Überlagerung der vertikal über die Oberseite der Schutzwand strömenden Schockwelle mit der seitlich um die Wand strömenden Schockwelle. Neben den in den Versuchen eingesetzten kurzen Wänden wurden lange Wände numerisch simuliert, wie sie in der Praxis benötigt werden. Die numerischen Untersuchungen an der langen Umfassungswand zeigten, dass Leitbleche die Intensität der Schockwelle deutlich reduzieren können. Bezüglich der Schutzwirkung erweist sich die Testkonfiguration mit einer Anordnung des Leitblechs von 45° in Richtung des Explosionsursprungs als wirkungsvollste Maßnahme. Im Vergleich zum Freifeldszenario wird in den untersuchten Bereichen eine Überdruckreduktion (Impulsreduktion) von 55,0 % bis 86,0 % (von 45,7 % bis 63,8 %) erreicht.

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Experimental and numerical investigations on the shock wave attenuation performance of blast walls with a canopy on top

Cited by 18 publications

References 8 publications

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

Blast wave interaction with structures – An overview

Untersuchung der Schutzwirkung von auf Gabionenwänden montierten Leitblechen gegen Explosionen

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