Dynamic Pressure Impulse for Near-Ideal and Non-Ideal Blast Waves -- Height of Burst Charts

1981 ◽  
Author(s):  
E. J. Bryant ◽  
F. J. Allen
Keyword(s):  
Dynamic Pressure ◽  
Blast Waves ◽  
Pressure Impulse

Pressure Distribution in a Simplified Human Ear Model for High Intensity Sound Transmission

2014 ◽  
Vol 136 (11) ◽  
Author(s):  
Takumi Hawa ◽  
Rong Z. Gan
Keyword(s):  
Growth Rate ◽  
Middle Ear ◽  
High Intensity ◽  
Dynamic Pressure ◽  
Pressure Ratio ◽  
Linear Growth Rate ◽  
Ear Canal ◽  
Fluid Structure ◽  
Pressure Impulse ◽  
Bench Model

High intensity noise/impulse transmission through a bench model consisting of the simplified ear canal, eardrum, and middle ear cavity was investigated using the CFX/ANSYS software package with fluid-structure interactions. The nondimensional fluid-structure interaction parameter q and the dimensionless impulse were used to describe the interactions between the high intensity pressure impulse and eardrum or tympanic membrane (TM). We found that the pressure impulse was transmitted through the straight ear canal to the TM, and the reflected overpressure at the TM became slightly higher than double the incident pressure due to the dynamic pressure (shocks) effect. Deformation of the TM transmits the incident pressure impulse to the middle ear cavity. The pressure peak in the middle ear cavity is lower than the incident pressure. This pressure reduction through the TM was also observed in our experiments that have dimensions similar to the simulation bench model. We also found that the increase of the pressure ratio as a function of the incident pressure is slightly larger than the linear growth rate. The growth rate of the pressure ratio in this preliminary study suggests that the pressure increase in the middle ear cavity may become sufficiently high to induce auditory damage and injury depending on the intensity of the incident sound noise.

scholarly journals Geomagnetic response to solar wind dynamic pressure impulse events at high-latitude conjugate points

2013 ◽  
Vol 118 (10) ◽  
pp. 6055-6071 ◽  
Author(s):  
H. Kim ◽  
X. Cai ◽  
C. R. Clauer ◽  
B. S. R. Kunduri ◽  
J. Matzka ◽  
...  
Keyword(s):  
Solar Wind ◽  
High Latitude ◽  
Dynamic Pressure ◽  
Solar Wind Dynamic Pressure ◽  
Conjugate Points ◽  
Pressure Impulse

The Effects of Direction and Velocity of Movement, and Intra-Articular Fluid Volume on Intra-Articular Pressue

1988 ◽  
Vol 01 (03/04) ◽  
pp. 113-121 ◽  
Author(s):  
S. F. Straface ◽  
P. J. Newbold ◽  
S. Nade
Keyword(s):  
Dynamic Pressure ◽  
Volume Of Fluid ◽  
Joint Capsule ◽  
Fluid Volume ◽  
Structural Configuration

levels. In joints with simulated acute effusion the effect of position on IAP was dependent upon the volume of fluid in the joint. The results indicate that dynamic pressure levels in the moving knee are related to the movements of the joint. The characteristic and reproducible patterns of pressure may reflect changes in the structural configuration of the joint capsule and surrounding tissues during movement, and are influenced by the amount of fluid in the joint.

Numerical and experimental investigation on internal membrane pressure wave inside sealed structure

2013 ◽  
Vol 61 (3) ◽  
pp. 613-621 ◽  
Author(s):  
W. Barnat
Keyword(s):  
Experimental Investigation ◽  
Pressure Wave ◽  
Pressure Increase ◽  
Internal Organs ◽  
Pressure Impulse ◽  
Internal Membrane ◽  
Contaminated Area

Abstract The article presents an approach to modeling the internal membrane pressure wave inside a sealed structure. During an explosion near a vehicle when a pressure wave reaches a hull, a pressure wave inside arises due to the hull’s bottom and the deformation of sides. They act like the piston - membrane. This membrane transfers the pressure impulse into the vehicle’s interior. A pressure increase causes the damage of internal organs or even death of occupants. In case of an armor penetration the pressure increase may be even larger. One of basic methods to protect a crew is to open hatches. However, such a method cannot be used in a contaminated area.

3-D unstructured adaptive supercomputing for transient problems of volcanic blast waves

1998 ◽  
Author(s):  
P. Voinovich ◽  
E. Timofeev ◽  
K. Takayama ◽  
T. Saito ◽  
A. Galyukov
Keyword(s):  
Blast Waves ◽  
Transient Problems
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