Pressure measurements on a deforming surface in response to an underwater explosion

1998 ◽  
Author(s):  
G. Chambers ◽  
H. Sandusky ◽  
F. Zerilli ◽  
K. Rye ◽  
R. Tussing
Keyword(s):  
Underwater Explosion ◽  
Pressure Measurements

scholarly journals Pressure Measurements on a Deforming Surface in Response to an Underwater Explosion in a Water-Filled Aluminum Tube

2001 ◽  
Vol 8 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. Chambers ◽  
H. Sandusky ◽  
F. Zerilli ◽  
K. Rye ◽  
R. Tussing ◽  
...  
Keyword(s):  
Shock Loading ◽  
Tube Wall ◽  
Underwater Explosion ◽  
Computer Code ◽  
Dynamic Interaction ◽  
Hypodermic Needle ◽  
Pressure Measurements ◽  
Cylindrical Structures ◽  
Explosive Charges ◽  
Carbon Resistor

Experiments have been conducted to benchmark DYSMAS computer code calculations for the dynamic interaction of water with cylindrical structures. Small explosive charges were suspended using hypodermic needle tubing inside Al tubes filled with distilled water. Pressures were measured during shock loading by tourmaline crystal, carbon resistor and ytterbium foil gages bonded to the tube using a variety of adhesives. Comparable calculated and measured pressures were obtained for the explosive charges used, with some gages surviving long enough to record results after cavitation with the tube wall.

Signal Interpretation Considerations When Estimating Subglottal Pressure From Oral Air Pressure

2019 ◽  
Vol 62 (5) ◽  
pp. 1326-1337 ◽  
Author(s):  
Brittany L. Perrine ◽  
Ronald C. Scherer ◽  
Jason A. Whitfield
Keyword(s):  
Standard Condition ◽  
Word Production ◽  
Air Pressure ◽  
Pressure Waveform ◽  
Pressure Measurements ◽  
Air Leak ◽  
Pressure Signal ◽  
Adult Participants ◽  
Syllable Repetition ◽  
Subglottal Pressure

Purpose Oral air pressure measurements during lip occlusion for /pVpV/ syllable strings are used to estimate subglottal pressure during the vowel. Accuracy of this method relies on smoothly produced syllable repetitions. The purpose of this study was to investigate the oral air pressure waveform during the /p/ lip occlusions and propose physiological explanations for nonflat shapes. Method Ten adult participants were trained to produce the “standard condition” and were instructed to produce nonstandard tasks. Results from 8 participants are included. The standard condition required participants to produce /pːiːpːiː.../ syllables smoothly at approximately 1.5 syllables/s. The nonstandard tasks included an air leak between the lips, faster syllable repetition rates, an initial voiced consonant, and 2-syllable word productions. Results Eleven oral air pressure waveform shapes were identified during the lip occlusions, and plausible physiological explanations for each shape are provided based on the tasks in which they occurred. Training the use of the standard condition, the initial voice consonant condition, and the 2-syllable word production increased the likelihood of rectangular oral air pressure waveform shapes. Increasing the rate beyond 1.5 syllables/s improved the probability of producing rectangular oral air pressure signal shapes in some participants. Conclusions Visual and verbal feedback improved the likelihood of producing rectangular oral air pressure signal shapes. The physiological explanations of variations in the oral air pressure waveform shape may provide direction to the clinician or researcher when providing feedback to increase the accuracy of estimating subglottal pressure from oral air pressure.

A Case Study: Using Wireline Pressure Measurements to Improve Reservoir Characterization in Tight Formation Gas - Wamsutter Field, Wyoming

2007 ◽  
Author(s):  
Russ A. Schrooten ◽  
Edward C. Boratko ◽  
Harjinder Singh ◽  
Jim McKay ◽  
Debora L. Hallford
Keyword(s):  
Reservoir Characterization ◽  
Pressure Measurements ◽  
Tight Formation
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