Remote Monitoring of Harsh Environments Using Acoustic Emissions
Publication: Journal of Engineering Mechanics
Volume 139, Issue 3
Abstract
This paper presents the results of studies assessing waveguided acoustic emission techniques for remotely sensing the condition of structures operating in extreme environments. A particularly acute challenge to sensing in extreme conditions is that the sensor and associated electronics are not sufficiently robust to withstand the structural test conditions. Instead, it is necessary to use signal transduction methods to carry the signal from the structure to a remote and more hospitable sensor location. In the studies reported here an inductively coupled plasma torch creates a simulated environment for the testing of hypervelocity vehicle heat shield materials. Stresses within the material generate acoustic emissions (AEs) that propagate as elastic waves. Waveguides coupled to the sample material and AE sensors allow sample material tests to be monitored remotely. The data were analyzed using multiple statistical methods. The results show that various testing conditions produce repeatable differences in the AE data set, providing evidence that AE testing is sensitive to changes in the thermal degradation of the sample material. AE testing currently offers the potential for real-time in situ monitoring of thermal degradation in laboratory testing conditions and represents progress toward a deployable diagnostic system for aerospace applications.
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References
ASTM. (2005). “Standard terminology for nondestructive examinations.” E1316-05, West Conshohocken, PA.
Bendat, J. S., and Piersol, A. G. (2000). Random data analysis and measurement procedures, 3rd Ed., Wiley, New York.
Duda, R. O., Hart, P. E., and Stork, D. G. (2000). Pattern classification, 2nd Ed., Wiley, New York.
Ellerby, D., et al. (2008). “Post-flight evaluation of Stardust PICA forebody heatshield material.” Proc., 6th Int. Planetary Probe Workshop Conf., National Aeronautics and Space Administration, Washington, DC.
Fox News. (2007). “Laser inspection of Space Shuttle Endeavour shows gouge penetrated heat shield tiles.” 〈http://www.foxnews.com/story/0,2933,293010,00.html〉 (Feb. 14, 2011).
Hellier, C. J. (2001). Handbook of nondestructive evaluation, McGraw Hill, New York.
Kachigan, S. K. (1982). Multivariate statistical analysis, Radiuss, New York.
Kim, Y.-B., and Choi, N.-S. (2003). “Characteristics of thermo-acoustic emission from composite laminates during thermal load cycles.” KSME Int. J., 17(3), 391–399.
Krzanowski, W. J. (1988). Principles of multivariate analysis, Clarendon, Oxford, U.K.
Lachaud, J., and Mansour, N. N. (2008). “Ablation of pica-like material: Surface or volume phenomenon?” Proc., 6th Int. Planetary Probe Workshop, National Aeronautics and Space Administration, Washington, DC.
Lee, D. B., and Goodrich, W. D. (1972). “The aerothermodynamic environment of the Apollo command module during superorbital entry.” NASA TN D-6792, National Aeronautics and Space Administration, Washington, DC.
Lin, B., Giurgiutiu, V., and Pollock, P. (2010). “Durability and survivability of piezoelectric wafer active sensors on metallic structures.” AIAA J., 48(3), 635–643.
Madaras, E. I., Prosser, W. H., and Gorman, M. R. (2005). “Detection of impact damage on Space Shuttle structures using acoustic emission.” AIP Conf. Proc., 760, 1113–1120.
MathWorks. (2010). MATLAB R2010b user’s manual, MathWorks, Natick, MA.
Milos, F. S., and Rasky, D. J. (1994). “Review of numerical procedures for computational surface thermochemistry.” J. Thermophys. Heat Transfer, 8(1), 24–34.
Olynick, D., Chen, Y.-K., and Tauber, M. (1999). “Aerothermodynamics of the Stardust sample return capsule.” J. Spacecr. Rockets, 36(3), 442–462.
Pollock, A. (2003). “Acoustic emission inspection.” Technical Rep. TR-103-96-12/89, MISTRAS Holdings Group, Princeton Junction, NJ.
Sato, N., Kurauchi, T., and Kamigato, O. (1988). “Detection of damage in composite materials by thermo-acoustic emission measurement.” J. Compos. Mater., 22(5), 447–458.
Tittmann, B. R., and Yen, C. E. (2008). “Acoustic emission technique for monitoring the pyrolysis of composites for process control.” Ultrasonics, 48(6–7), 621–630.
Tran, H. K., Rasky, D. J., and Esfahani, L. (1994). “Thermal response and ablation characteristics of light-weight ceramic ablators.” J. Spacecr. Rockets, 31(6), 993–998.
Viktorov, I. A. (1967). Rayleigh and Lamb waves: Physical theory and applications, Plenum, New York.
Whittaker, J. W., and Brosey, W. D. (1989). “Detection of impact damage in composite structures by use of thermally-activated acoustic emission.” J. Acoust. Emiss., 8, S280–S283.
Zhang, L., Pejaković, D. A., Marschall, J., and Fletcher, D. G. (2009). “Laboratory investigation of active graphite nitridation by atomic nitrogen.” Proc., 41st AIAA Thermophysics Conf., American Institute of Aeronautics and Astronautics, Reston, VA.
Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 139 • Issue 3 • March 2013
Pages: 286 - 295
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 31, 2011
Accepted: May 21, 2012
Published online: May 23, 2012
Published in print: Mar 1, 2013
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