Experimental study of detonating gas bubble oscillations using a shock tube

1993 ◽  
Vol 43 (11) ◽  
pp. 1071-1081
Author(s):  
K. Vokurka
Keyword(s):  
Experimental Study ◽  
Shock Tube ◽  
Gas Bubble ◽  
Bubble Oscillations ◽  
Detonating Gas

scholarly journals Factors Contributing to Increased Blast Overpressure Inside Modern Ballistic Helmets

2020 ◽  
Vol 10 (20) ◽  
pp. 7193
Author(s):  
Maciej Skotak ◽  
Jonathan Salib ◽  
Anthony Misistia ◽  
Arturo Cardenas ◽  
Eren Alay ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shock Tube ◽  
Principle Component Analysis ◽  
Hot Spots ◽  
Shape Factor ◽  
Elevated Pressure ◽  
Focal Points ◽  
Parietal Region ◽  
Blast Overpressure ◽  
Pressure Fields

This study demonstrates the orientation and the "shape factor" have pronounced effects on the development of the localized pressure fields inside of the helmet. We used anatomically accurate headform to evaluate four modern combat helmets under blast loading conditions in the shock tube. The Advanced Combat Helmet (ACH) is used to capture the effect of the orientation on pressure under the helmet. The three modern combat helmets: Enhanced Combat Helmet (ECH), Ops-Core, and Airframe, were tested in frontal orientation to determine the effect of helmet geometry. Using the unhelmeted headform data as a reference, we characterized pressure distribution inside each helmet and identified pressure focal points. The nature of these localized “hot spots” is different than the elevated pressure in the parietal region of the headform under the helmet widely recognized as the under-wash effect also observed in our tests. It is the first experimental study which indicates that the helmet presence increased the pressure experienced by the eyes and the forehead (glabella). Pressure fingerprinting using an array of sensors combined with the application of principle component analysis (PCA) helped elucidate the subtle differences between helmets.

Rectified diffusion during nonlinear gas bubble oscillations

1991 ◽  
Vol 89 (4B) ◽  
pp. 1863-1863
Author(s):  
Vinod Kamath ◽  
Andrea Prosperetti
Keyword(s):  
Gas Bubble ◽  
Bubble Oscillations

scholarly journals Chaotic gas bubble oscillations in a viscoelastic fluid

2008 ◽  
Vol 336 (5) ◽  
pp. 411-416 ◽  
Author(s):  
Javier Jiménez-Fernández
Keyword(s):  
Viscoelastic Fluid ◽  
Gas Bubble ◽  
Bubble Oscillations
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