scholarly journals Model of Variable Volume Tank used for Portable Air Supply Sysetm

2020 ◽  
Vol 51 (1) ◽  
pp. 9-15
Author(s):  
Jun KADOWAKI ◽  
Daisuke SASAKI ◽  
Takumi KAYAHARA
Keyword(s):  
Variable Volume ◽  
Air Supply

Development of Portable Energy-Saving Type Air Supply System – 1st Report: Effect of Variable Volume Tank –

2012 ◽  
Vol 24 (3) ◽  
pp. 464-471 ◽  
Author(s):  
Tatsuyuki Iwawaki ◽  
◽  
Daisuke Sasaki ◽  
Toshiro Noritsugu ◽  
Masahiro Takaiwa
Keyword(s):  
Energy Saving ◽  
Elastic Energy ◽  
Supply System ◽  
Pneumatic Actuator ◽  
Variable Volume ◽  
Flexible Materials ◽  
Supply Pressure ◽  
System A ◽  
Air Supply ◽  
Discharge Pressure

The purpose of this study is to develop a portable energy-saving type air supply system. A variable volume tank is developed in order to drive a pneumatic actuator with a low discharge pressure in a tank. The developed tank composed of flexible materials can store pneumatic energy by converting it to elastic energy. In this paper, the composition of the system, the structure and characteristic of a variable volume tank and experiment of driving actuator with constant and variable volume tanks are discussed. As a result, the variable volume tank can drive the actuator at a lower supply pressure than with the constant volume tank.

The Air Supply

1890 ◽  
Vol 10 (5build) ◽  
pp. 70-70
Keyword(s):  
Air Supply

Skin Cooling on Breath-Hold Duration and Predicted Emergency Air Supply Duration During Immersion

2020 ◽  
Vol 91 (7) ◽  
pp. 578-585
Author(s):  
Victory C. Madu ◽  
Heather Carnahan ◽  
Robert Brown ◽  
Kerri-Ann Ennis ◽  
Kaitlyn S. Tymko ◽  
...  
Keyword(s):  
Minute Ventilation ◽  
Hold Time ◽  
Whole Body ◽  
Breath Hold ◽  
Endurance Time ◽  
Skin Exposure ◽  
Breathing Apparatus ◽  
Air Supply ◽  
Skin Cooling ◽  
Breath Hold Duration

PURPOSE: This study was intended to determine the effect of skin cooling on breath-hold duration and predicted emergency air supply duration during immersion.METHODS: While wearing a helicopter transport suit with a dive mask, 12 subjects (29 ± 10 yr, 78 ± 14 kg, 177 ± 7 cm, 2 women) were studied in 8 and 20°C water. Subjects performed a maximum breath-hold, then breathed for 90 s (through a mouthpiece connected to room air) in five skin-exposure conditions. The first trial was out of water for Control (suit zipped, hood on, mask off). Four submersion conditions included exposure of the: Partial Face (hood and mask on); Face (hood on, mask off); Head (hood and mask off); and Whole Body (suit unzipped, hood and mask off).RESULTS: Decreasing temperature and increasing skin exposure reduced breath-hold time (to as low as 10 ± 4 s), generally increased minute ventilation (up to 40 ± 15 L · min−1), and decreased predicted endurance time (PET) of a 55-L helicopter underwater emergency breathing apparatus. In 8°C water, PET decreased from 2 min 39 s (Partial Face) to 1 min 11 s (Whole Body).CONCLUSION: The most significant factor increasing breath-hold and predicted survival time was zipping up the suit. Face masks and suit hoods increased thermal comfort. Therefore, wearing the suits zipped with hoods on and, if possible, donning the dive mask prior to crashing, may increase survivability. The results have important applications for the education and preparation of helicopter occupants. Thermal protective suits and dive masks should be provided.Madu VC, Carnahan H, Brown R, Ennis K-A, Tymko KS, Hurrie DMG, McDonald GK, Cornish SM, Giesbrecht GG. Skin cooling on breath-hold duration and predicted emergency air supply duration during immersion. Aerosp Med Hum Perform. 2020; 91(7):578–585.

STUDYING OF THE CHANGE OF OIL REPLACEMENT COEFFICIENT IN THE ZONES OF VARIABLE VOLUME OF THE WORKING AGENT INJECTION INTO A FORMATION

2019 ◽  
pp. 5-9
Author(s):  
R.M. Insafov ◽  
◽  
A.F. Egorov ◽  
R.Kh. Gilmanova ◽  
A.A. Rakhmatullin ◽  
...  
Keyword(s):  
Variable Volume ◽  
Working Agent
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