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Implications of Dynamic Pressure Transducer Mounting Variations on Measurements in Pyrotechnic Test ApparatusAccurate dynamic pressure measurements are often difficult to make within small pyrotechnic devices, and transducer mounting difficulties can cause data anomalies that lead to erroneous conclusions. Delayed initial pressure response followed by data ringing has been observed when using miniaturized pressure transducer mounting adapters required to interface transducers to small test chambers. This delayed pressure response and ringing, combined with a high data acquisition rate, has complicated data analysis. This paper compares the output signal characteristics from different pressure transducer mounting options, where the passage distance from the transducer face to the pyrotechnic chamber is varied in length and diameter. By analyzing the data and understating the associated system dynamics, a more realistic understanding of the actual dynamic pressure variations is achieved. Three pressure transducer mounting configurations (elongated, standard, and face/flush mount) were simultaneously tested using NASA standard initiators in closed volume pressure bombs. This paper also presents results of these pressure transducer mounting configurations as a result of a larger NASA Engineering and Safety Center pyrovalve test project. Results from these tests indicate the improved performance of using face/flush mounted pressure transducers in this application. This type of mounting improved initial pressure measurement response time by approximately 19 s over standard adapter mounting, eliminating most of the lag time; provided a near step-function type initial pressure increase; and greatly reduced data ringing in high data acquisition rate systems. The paper goes on to discuss other issues associated with the firing and instrumentation that are important for the tester to understand.
Document ID
20090026576
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Dibbern, Andreas (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Crisafulli, Jeffrey (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Hagopia, Michael (NASA Goddard Space Flight Center Greenbelt, MD, United States)
McDougle, Stephen H. (NASA Johnson Space Center Houston, TX, United States)
Saulsberry, Regor L. (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Engineering (General)
Report/Patent Number
JSC-CN-18578
Meeting Information
Meeting: 45th AIAA/ASME/SAE/ASEE Joint Propulsion
Location: Colorado
Country: United States
Start Date: August 2, 2009
End Date: August 5, 2009
Sponsors: American Inst. of Aeronautics and Astronautics
Distribution Limits
Public
Copyright
Public Use Permitted.

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