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High-Precision Digital Image Correlation for Investigation of Fluid-Structure Interactions in a Shock Tube

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Abstract

Background: Structural response measurements are challenging in aerodynamic testing environments due to high-speed requirements, facility vibrations, and the desire for non-intrusive measurements. Objective: This study uses stereo digital image correlation (DIC) to investigate the response of a jointed beam under aerodynamic loading in a shock tube. Methods: The incident shock subjects the beam to an impulsive frontal load followed by periodic transverse loading from vortex shedding. Several considerations necessary to realize high-precision are addressed: first, a hybrid stereo camera calibration accounted for tangential distortions when imaging through thick windows. Second, a measurement bias from Xenon flash-lamp light sources was identified and removed using laser illumination. Third, facility motion was mitigated by vibration isolation and appropriate signal filtering. Finally, aero-optical distortions from turbulence were removed using a low-order reconstruction. Results: The resulting displacement data has a noise floor of approximately ± 1 μm at 20 kHz sampling rate. The reduction of primary noise sources allows a transient structural response on the order of 10–40 μm to be quantified. The highest vibrations occurred when the vortex shedding frequency matched the beam’s natural frequency. Conclusion: the noise reduction techniques described allow for structural measurements requiring high-precision, non-intrusive displacement data to be performed in aerodynamic environments.

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Acknowledgements

Caroline Winters, Michael Clemenson, and Patrick Barnett are kindly acknowledged for their help with the spectroscopy of the flashlamp sources. For machining of the beam and setup of the test section, the support of Tom Grasser, Paul Farias, and Seth Spitzer is greatly appreciated. The help of Phillip Reu for reviewing the manuscript is also appreciated.

Sandia National Laboratories is a multimission laboratory managed and operated by National Technology & Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525. This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the U.S. Department of Energy or the United States Government.

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This study was funded by the Sandia Laboratory Directed Research and Development (LDRD) program.

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Correspondence to K. P. Lynch.

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Lynch, K.P., Jones, E.M.C. & Wagner, J.L. High-Precision Digital Image Correlation for Investigation of Fluid-Structure Interactions in a Shock Tube. Exp Mech 60, 1119–1133 (2020). https://doi.org/10.1007/s11340-020-00610-8

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