Theoretical modeling and experimental study of pressure fields of inclined airflow film

2021 ◽  
Vol 67 ◽  
pp. 14-23
Author(s):  
Xubo Yu ◽  
Xin Li
Keyword(s):  
Experimental Study ◽  
Theoretical Modeling ◽  
Pressure Fields

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.

Theoretical modeling and experimental study of dielectric loss of the multi-push-pull mode magnetoelectric laminate composites

2018 ◽  
Vol 5 (2) ◽  
pp. 026105
Author(s):  
Bingbing Xu ◽  
Jiashuai Ma ◽  
Cong Fang ◽  
Meng Yao ◽  
Wenning Di ◽  
...  
Keyword(s):  
Experimental Study ◽  
Dielectric Loss ◽  
Theoretical Modeling ◽  
Laminate Composites

Experimental study and theoretical modeling of bidimensional beam fanning: application to DPCM

2001 ◽  
Vol 18 (1) ◽  
pp. 61-63
Author(s):  
C. Mailhan ◽  
M. Goetz ◽  
N. Fressengeas ◽  
G. Kugel
Keyword(s):  
Experimental Study ◽  
Theoretical Modeling

scholarly journals Erratum to: Theoretical modeling and experimental study of Japanese “Watari-ago” joints

2015 ◽  
Vol 61 (6) ◽  
pp. 647-647
Author(s):  
Keita Ogawa ◽  
Yasutoshi Sasaki ◽  
Mariko Yamasaki
Keyword(s):  
Experimental Study ◽  
Theoretical Modeling

scholarly journals A full-scale experimental study of sub-slab pressure fields induced by underground perforated pipes as a soil depressurisation technique in radon mitigation

2020 ◽  
Vol 225 ◽  
pp. 106420
Author(s):  
Borja Frutos ◽  
Isabel Sicilia ◽  
Oscar Campo ◽  
Sofía Aparicio ◽  
Margarita González ◽  
...  
Keyword(s):  
Experimental Study ◽  
Full Scale ◽  
Pressure Fields

scholarly journals Theoretical and Experimental Study of New Photochromic Bis-Spiropyrans with Hydroxyethyl and Carboxyethyl Substituents

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
E. L. Mukhanov ◽  
I. V. Dorogan ◽  
A. V. Chernyshev ◽  
S. O. Bezuglyi ◽  
I. V. Ozhogin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Experimental Study ◽  
Metal Ions ◽  
Theoretical Modeling ◽  
Thermal Decay ◽  
Improved Stability ◽  
Thermal Stability Of

Two new asymmetrical bis-spiropyrans with nonequivalent spiropyran units have been investigated. Hydroxyethyl and carboxyethyl substituents have been used to improve thermal stability of the photoinduced merocyanine forms of the bis-spiropyrans. 2-Hydroxyethyl substituted compound is characterized by 4 times more stable merocyanine isomer. 2-Carboxyethyl substituent in the hetarene part enables chelation by metal ions and controllably stabilizes the merocyanine from thermal decay. As a result of theoretical modeling and photochemical experiments, it was shown that obtained compounds are perspective prototypes for multistate light-driven switches with improved stability of photoinduced forms.

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