Quantifying the insertion loss of hearing protection using a compressed gas shock tube

2018 ◽  
Vol 143 (3) ◽  
pp. 1934-1934
Author(s):  
Theodore F. Argo ◽  
Nate Greene ◽  
James Easter ◽  
Daniel J. Tollin ◽  
Timothy J. Walilko
Keyword(s):  
Shock Tube ◽  
Insertion Loss ◽  
Hearing Protection ◽  
Compressed Gas ◽  
Loss Of Hearing

Comparison of impulse peak insertion loss measured with gunshot and shock tube noise sources

2014 ◽  
Vol 136 (4) ◽  
pp. 2165-2165
Author(s):  
William J. Murphy ◽  
Elliott H. Berger ◽  
William A. Ahroon
Keyword(s):  
Shock Tube ◽  
Insertion Loss ◽  
Noise Sources

scholarly journals On the formation of Friedlander waves in a compressed-gas-driven shock tube

2016 ◽  
Vol 472 (2186) ◽  
pp. 20150611 ◽  
Author(s):  
Abiy F. Tasissa ◽  
Martin Hautefeuille ◽  
John H. Fitek ◽  
Raúl A. Radovitzky
Keyword(s):  
Shock Tube ◽  
Analytical Model ◽  
Blast Waves ◽  
Rational Approach ◽  
Initial Structure ◽  
Shock Tubes ◽  
Rarefaction Waves ◽  
Wave Interactions ◽  
Compressed Gas ◽  
Volume Method

Compressed-gas-driven shock tubes have become popular as a laboratory-scale replacement for field blast tests. The well-known initial structure of the Riemann problem eventually evolves into a shock structure thought to resemble a Friedlander wave, although this remains to be demonstrated theoretically. In this paper, we develop a semi-analytical model to predict the key characteristics of pseudo blast waves forming in a shock tube: location where the wave first forms, peak over-pressure, decay time and impulse. The approach is based on combining the solutions of the two different types of wave interactions that arise in the shock tube after the family of rarefaction waves in the Riemann solution interacts with the closed end of the tube. The results of the analytical model are verified against numerical simulations obtained with a finite volume method. The model furnishes a rational approach to relate shock tube parameters to desired blast wave characteristics, and thus constitutes a useful tool for the design of shock tubes for blast testing.

scholarly journals Measurement of impulse peak insertion loss for four hearing protection devices in field conditions

2011 ◽  
Vol 51 (sup1) ◽  
pp. S31-S42 ◽  
Author(s):  
William J. Murphy ◽  
Gregory A. Flamme ◽  
Deanna K. Meinke ◽  
Jacob Sondergaard ◽  
Donald S. Finan ◽  
...  
Keyword(s):  
Insertion Loss ◽  
Field Conditions ◽  
Hearing Protection ◽  
Protection Devices

High-Frequency Loss of Hearing in Secondary School Students

1983 ◽  
Vol 14 (1) ◽  
pp. 22-28 ◽  
Author(s):  
Charles Woodford ◽  
Mary Lynn O'Farrell
Keyword(s):  
Public Schools ◽  
High Frequency ◽  
Noise Exposure ◽  
Sound Level ◽  
Hearing Protection ◽  
School Students ◽  
The Public ◽  
Sound Levels ◽  
Loss Of Hearing

Data were collected on sound levels in public school shops, the policies regarding hearing protection and sound level monitoring in shops in a four-state area, and hearing levels of students with varying histories of noise exposure. Results of this study warrant three conclusions: (a) Sound levels in most school shops are sufficient to constitute a hazard to hearing. (b) A very small percentage of the shop programs surveyed furnish hearing protection or monitor sound levels. (c) Students involved in shop activities and/or use firearms are more apt to have high-frequency loss of hearing than those not participating in these activities. These findings are discussed in terms of implications for the involved students and the role of audiology as a profession in the public schools.

scholarly journals Measurement of impulse peak insertion loss from two acoustic test fixtures and four hearing protector conditions with an acoustic shock tube

2015 ◽  
Vol 17 (78) ◽  
pp. 364 ◽  
Author(s):  
WilliamJ Murphy ◽  
CameronJ Fackler ◽  
ElliottH Berger ◽  
PeterB Shaw ◽  
Mike Stergar
Keyword(s):  
Shock Tube ◽  
Insertion Loss ◽  
Hearing Protector
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