Influence Factors and Developing Regularity of Air Pressure Pulse As Trains Pass by Each Other

ICTE 2011 ◽  
2011 ◽  
Author(s):  
Jie Liu ◽  
Renxian Li ◽  
Zhendang Qi
Keyword(s):  
Pressure Pulse ◽  
Influence Factors ◽  
Air Pressure

Analysis of the Surface Integrity Machined by Short Electric Arc Machining

2011 ◽  
Vol 462-463 ◽  
pp. 1068-1074 ◽  
Author(s):  
Jian Ping Zhou ◽  
Mamtimin Gheni ◽  
Chu Hua Liang ◽  
Yan Xu ◽  
Bi Sheng Zhou
Keyword(s):  
Surface Integrity ◽  
Orthogonal Experiment ◽  
Water Pressure ◽  
Influence Factors ◽  
Surface Hardness ◽  
Air Pressure ◽  
Workpiece Surface ◽  
Pressure Gap ◽  
Relative Line ◽  
Electrode Discharge

In order to research the surface integrity of SEAM, the surface figure, surface heat-affected zones (HAZ ) and surface hardness are analyzed. The author mainly researches the influence factors of water pressure, air pressure, cathode feed rate and relative line speed on processing indictor. The orthogonal experiment results indicate that the main influence factors of surface roughness and HAZ are air pressure, gap voltage and cutting depth. In SEAM, certain scope pressure atomization of dielectric liquid has deionization and arc-extinguishing effect, and takes away melted metal and heat from the discharge channel in time. Workpiece surface will be smoothness. However, the enlarged air pressure will break normal electrode discharge and make the surface smoothness worse. The research of influence of gap voltage on surface quality are accomplished.

Design & Calculation of Air Chamber of Air Cushion Belt Conveyor

2013 ◽  
Vol 473 ◽  
pp. 3-6
Author(s):  
Bang Ying Peng ◽  
Jian Hua Yan ◽  
Shu Cao
Keyword(s):  
Influence Factors ◽  
Practical Experience ◽  
Structure Design ◽  
Air Pressure ◽  
Design Calculation ◽  
Belt Conveyor ◽  
Air Volume ◽  
Air Chamber ◽  
Air Cushion ◽  
Opening Method

The article mainly provides an overview of air cushion belt conveyor, and describes design of air chamber, as an important part of the air cushion belt conveyor. The article introduces reasonable structure design of the air chamber from aspect of practical experience. In addition, the article researches air pressure design and calculation of air chamber, design and calculation of air volume of the air chamber, as well as power determination and design calculation on fan. The article designs and calculates per opening area of the air chamber as well as opening method of the chute depending on air pressure and air volume, and simultaneously analyzes formation influence factors and features of air pad in the chute. And finally, the article proposes reference conclusion and suggestions on the basis of research on the design of the air chamber.

Comparison of Recovery and Recrystallization in Stainless Steel Following Plane-Wave Shock Loading and Explosive Forming

1970 ◽  
Vol 28 ◽  
pp. 428-429 ◽  
Author(s):  
J. A. Korbonski ◽  
L. E. Murr
Keyword(s):  
Stainless Steel ◽  
Shock Loading ◽  
Pressure Pulse ◽  
Shock Pressure ◽  
304 Stainless Steel ◽  
Strain Rates ◽  
Two Dimensional ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Explosive Forming

Comparison of recovery rates in materials deformed by a unidimensional and two dimensional strains at strain rates in excess of 104 sec.−1 was performed on AISI 304 Stainless Steel. A number of unidirectionally strained foil samples were deformed by shock waves at graduated pressure levels as described by Murr and Grace. The two dimensionally strained foil samples were obtained from radially expanded cylinders by a constant shock pressure pulse and graduated strain as described by Foitz, et al.

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.

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