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2007, 11

Patrick J. Vitarius, Don A. Gregory, Valentin Korman, John Wiley

Correcting distortion in acoustic sense lines

language: English

received 05.04.2007, published 25.06.2007

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ABSTRACT

Pressure sense lines, as employed in the measurement of rocket engine test firings, can propagate the time-domain pressure signal out of hostile regions, which allows the use of instrumentation with fragile pressure transducers. In such applications, it is necessary to correct the data to account for attenuation and resonance due to the sense line. One technique for doing this involves the application of Fourier transform theory to obtain the transfer function of the sense line. Various techniques for obtaining the transfer function are explored, including the use of Gaussian noise, single frequency sweeps, and impulse signals as input functions. The transfer function thus obtained is then mathematically fit, scaled, and validated against a related rocket engine test.

Keywords: acoustical measurements, rocket engine noise, Fourier transform, transfer function

7 pages, 3 figures

Сitation: Patrick J. Vitarius, Don A. Gregory, Valentin Korman, John Wiley. Correcting distortion in acoustic sense lines. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2007, 11.

REFERENCES

1. Vitarius P., Gregory D. A., Wiley J., and Korman V. Acoustic Wave Propagation in Pressure Sense Lines. 39th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, AIAA-2003-5182, AIAA, Washington, DC, 2003.
2. Irwin H. P. A. H., Cooper K. R., and Girard R. Correction of Distortion Effects Caused by Tubing Systems in Measurements of Fluctuating Pressures. J. Ind. Aerodyn., 5 (1979), pp. 93-107.
3. Swalwell K. E., Sheridan J., and Melbourne W. E. Frequency Analysis of Surface Pressures on an Airfoil After Stall. 21st AIAA Applied Aerodynamics Conference, AIAA-2003-3416, AIAA, Washington, D.C., 2003.

 

Patrick Vitarius earned his undergraduate degree in Physics from Rensselaer Polytechnic Institute in Troy, NY. After teaching physics and mathematics with the United States Peace Corps, he earned his master’s degree in physics from the University of Alabama in Huntsville. He is currently completing his Ph.D. research in physics on the topic of orbital mechanics. He is currently working for Freel Innovations as an Associate Engineer performing data analysis and algorithm development.

 
 

Don A. Gregory, Ph.D. Physics, the University of Alabama in Huntsville (1984). Professor Gregory was a material scientist for NASA and a Supervisory Research Physicist for the US Army Missile Command before joining UAH in 1992 as an Associate Professor of Physics. He has graduated 30 students with MS or Ph.D.’s and has supervised research in a wide variety of topics ranging from fundamental optical properties of materials to optical engineering solutions to practical problems. He has more than 100 refereed open literature publications in optics, engineering, and chemistry journals. His current interests are in the areas of optical properties of blown glass, basic radiometry, and acoustic signal propagation.

e-mail: gregoryd(at)uah.edu
 
 

Valentin Korman earned his undergraduate degree in Astrophysics from New Mexico Tech. and then earned a masters degree in physics from the University of Alabama in Huntsville in 1999. He currently is completing his PhD research in optical science and engineering on the topic of optical cryogenic mass flow. He has conducted research for the past 5 years at NASA’s Marshall Space Flight Center propulsion test area. He is currently working for Madison Research Corporation as a Senior Researcher performing sensor development and evaluation for NASA.
 
 

John Wiley: B.S. Electrical Engineering, University of Alabama, Huntsville (1989), M.S. Applied Science, University of Arkansas, Little Rock (1998). 16 years experience as a propulsion test instrumentation engineer. Provided test support for sensor applications, data validation, data acquisition system configuration and data analysis. Experience in sensor applications and data validation of measurements made in cryogenic fluids. Team leader in the design and development of an advanced measurement system for engine test facilities. Sensor development projects include: high flow cryogenic fluid RTD temperature sensor, optical cryogenic fluid density sensor.