scholarly journals Non-nuclear qualification testing of strain gage type differential pressure transducers for shielded application

1965 ◽  
Author(s):  
M.V. Simoncini
Keyword(s):  
Strain Gage ◽  
Differential Pressure ◽  
Pressure Transducers ◽  
Qualification Testing

Analysis of pulsating flow measurement of engine exhaust by a Pitot tube flowmeter

2005 ◽  
Vol 6 (1) ◽  
pp. 85-93 ◽  
Author(s):  
H Nakamura ◽  
I Asano ◽  
M Adachi ◽  
J Senda
Keyword(s):  
Fast Response ◽  
Differential Pressure ◽  
Pulsating Flow ◽  
Pitot Tube ◽  
Engine Exhaust ◽  
Idle Speed ◽  
Pressure Transducers ◽  
Vehicle Engine ◽  
Before And After ◽  
Response Pressure

The Pitot tube flowmetering technique has been used to measure pulsating flow from a vehicle engine exhaust. In general, flowmetering techniques that utilize differential pressure measurements based on Bernoulli's theory are likely to show erroneous readings when measuring an average flowrate of pulsating flow. The primary reason for this is the non-linear relationship between the differential pressure and the flowrate; i.e. the flowrate is proportional to the square root of the differential pressure. Therefore, an average of the differential pressure does not give an average of pulsating flow. In this study, fast response pressure transducers have been used to measure the pulsating pressure. Then the pulsating differential pressure is converted to the flowrate while keeping the pulsation unaveraged. An average flowrate is then calculated in the flowrate domain in order to maintain linearity before and after averaging. The peak amplitude of a pulsation measured here was about 1800 L/min at an average flowrate of 70 L/min when the engine ran at idle speed. This measurement has been confirmed by measuring the pulsation with a gas analyser. The results show a large amount of back and forth gas movement in the exhaust tube. This magnitude of pulsation can cause as much as five times higher erroneous results with the pressure domain averaging when compared to a flowrate domain averaging.

Effect of sternothyrohyoid myectomy on upper airway mechanics in normal horses

1994 ◽  
Vol 77 (6) ◽  
pp. 2812-2816 ◽  
Author(s):  
S. J. Holcombe ◽  
W. L. Beard ◽  
K. W. Hinchcliff ◽  
J. T. Robertson
Keyword(s):  
Upper Airway ◽  
Face Mask ◽  
Differential Pressure ◽  
Inspiratory Pressure ◽  
O2 Consumption ◽  
Airway Patency ◽  
Pressure Transducers ◽  
Significant Difference ◽  
Airway Mechanics ◽  
Inspiratory Resistance

The effect of transection of the sternothyroideus and sternohyoideus muscles on upper airway mechanics was investigated in exercising horses. Upper airway mechanics of six Standardbred horses were measured at rest and during exercise before and 24 h and 2 wk after sternothyrohyoid myectomy. Transnasal tracheal and pharyngeal catheters connected to differential pressure transducers were used to measure tracheal and pharyngeal pressures. A pneumotachograph mounted on the rostral end of an airtight face mask was used to measure airflow. Horses ran at 50, 75, and 100% of maximal O2 consumption on a treadmill. Twenty-four hours after sternothyrohyoid myectomy, no significant difference was detected in tracheal, pharyngeal, or translaryngeal inspiratory and expiratory pressures and impedances, inspiratory and expiratory flows, and respiratory frequency. Two weeks after sternothyrohyoid myectomy, there was a statistically significant increase in translaryngeal inspiratory pressure (P = 0.035) and tracheal inspiratory pressure (P = 0.032) compared with preoperative measurements. Two weeks after sternothyrohyoid myectomy, there was a statistically significant increase in translaryngeal inspiratory resistance (P = 0.017) and tracheal inspiratory resistance (P = 0.023) compared with preoperative values. Increased translaryngeal and tracheal inspiratory pressures and resistances after sternothyrohyoid myectomy suggest that the sternothyroideus and sternohyoideus muscles act to increase or maintain upper airway patency and stability in normal horses.

scholarly journals Apparatus for the Dynamic Calibration of Low-Range Differential Pressure Transducers

AIAA Journal ◽  
2018 ◽  
Vol 56 (3) ◽  
pp. 1294-1297 ◽  
Author(s):  
Mark A. Feero ◽  
Philippe Lavoie ◽  
Pierre E. Sullivan
Keyword(s):  
Differential Pressure ◽  
Dynamic Calibration ◽  
Pressure Transducers

Determination of the dynamic characteristics of adhesiveless strain gage pressure transducers

1989 ◽  
Vol 32 (1) ◽  
pp. 52-56 ◽  
Author(s):  
V. I. Pechuk ◽  
V. M. Zakharenko ◽  
V. Yu. Skripchuk ◽  
A. Yu. Shvets
Keyword(s):  
Strain Gage ◽  
Dynamic Characteristics ◽  
Pressure Transducers ◽  
Gage Pressure

Comparison of manganin, InSb, and strain gage pressure transducers

1990 ◽  
Vol 5 (1-6) ◽  
pp. 804-806 ◽  
Author(s):  
Vern E. Bean ◽  
G. F. Molinar
Keyword(s):  
Strain Gage ◽  
Pressure Transducers ◽  
Gage Pressure

scholarly journals WAVE MEASUREMENT WITH DIFFERENTIAL PRESSURE GAUGES

1984 ◽  
Vol 1 (19) ◽  
pp. 51 ◽  
Author(s):  
Kevin R. Bodge ◽  
Robert G. Dean
Keyword(s):  
Sensor Arrays ◽  
Field Research ◽  
Differential Pressure ◽  
Hf Radar ◽  
Absolute Pressure ◽  
Measuring Instruments ◽  
Army Corps ◽  
Engineering Research ◽  
Pressure Transducers ◽  
Directional Wave

The potential error of estimating the small pressure gradient under a directional wave field through the subtraction or comparison of relatively large total-head signals from adjacent pressure transducers in an array is avoided through the use of differential pressure transducers which measure directly the pressure gradients. A device which utilizes four differential pressure tranducers placed orthogonally about one absolute pressure transducer, (the "DPG"), was developed and field-tested at the U.S. Army Corps of Engineers Coastal Engineering Research Center Field Research Facility, Duck, North Carolina. The first five directional Fourier coefficients of the directional ocean spectra were developed from the DPG data, and although no other in_ situ directional wave monitors were available for comparison, the directional peak determined from the DPG agreed well with simultaneous High Frequency (HF) radar data. The DPG instrument is about one-half the size and less than one-sixth the weight of conventional pressure sensor arrays. The field establishment of the orientation of directional-measuring instruments is also discussed.

Fire Behavior in a Poorly Ventilated Compartment

2001 ◽  
Author(s):  
K. Wakatsuki ◽  
B. Ringwelski ◽  
J. G. Quintiere
Keyword(s):  
Mass Loss Rate ◽  
Video Recording ◽  
Fire Behavior ◽  
Differential Pressure ◽  
Pressure Transducers ◽  
Fire Experiment ◽  
Ceiling Vent ◽  
In Fire ◽  
Oxygen Fuel ◽  
Roof Temperature

Abstract The fire behavior of heptane burning in a poorly ventilated compartment was studied. The diameter of the heptane pan fires were varied and the ventilation opening size and location were adjusted. Two kinds of compartment fire experiment were conducted: (1) horizontal slits at the top and bottom of a wall, and (2) a single vent at the roof. Temperature, oxygen, fuel mass loss rate and differential pressure were measured. Extinction was studied with an oxygen meter to find the minimum oxygen concentration in the compartment achieved in ventilation-controlled fires. Extinguishments due to ventilation or complete fuel consumption was distinguished. Flow exchange was measured by differential pressure transducers. Particularly, flow exchange of ceiling vent was examined by calculation of flooding pressure difference, which will allow bi-directional flow. The wall vent case had oscillatory combustion (puffing), which sometimes leads to an increase in fire amplitude followed by extinction. This was not observed for the ceiling vent case. Video recording of the flame was conducted through a glass on sidewall. The fire behavior varied from conditions in which the flame extinguishes to cases of steady burning. In some cases, “ghosting flames” were observed.

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