Abstract
In recent years, a laboratory noncontact excitation method based on the focused ultrasound radiation force, generated by an ultrasonic transducer has been exploited to excite vibrations within structures with size ranging from the micro to macro scale. The excitation frequency has a range from a few kHz to 1 MHz and can potentially be used for modal testing. However, the inability to monitor the real time acoustic radiation force prevents this approach from being used as a practical technique for measuring the frequency response functions in modal testing. This work deals with understanding the acoustic field generated from ultrasonic transducers in order to monitor and control the acoustic radiation pressure and force imparted to a structure.
In this paper, the acoustic field generated by circular ultrasonic transducers was calculated based on the Rayleigh Integral and a boundary element method. The vibration velocity distribution of the vibration surface of an ultrasonic transducer at certain frequencies was measured, linearly interpolated, and mapped to the radially discretized elements of transducer surface, which was then used to map the acoustic pressure generated. A microphone array was built to measure the frequency response functions (FRFs) of acoustic pressure with respect to the drive voltage at several spatial locations within three vertical and one horizontal planes in front of the transducer. The comparison between the simulation results and experimental results is presented and shows good agreement.
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References
Avitablie, P.: Experimental modal analysis - a simple non-mathematical presentation. Sound Vib., Jan. 1–11 (2001)
Avitabile, P.: Back to basics – why is mass loading and data consistency important for modal parameter estimation? Exp. Tech. 24(6), 19–20 (2000)
Zhang, X., Fatemi, M., Greenleaf, J.F.: Vibro-acoustography for modal analysis of arterial vessels. In: Proceedings of 2002 IEEE International Symposium on Biomedical Imaging (2002)
Huber, T., Abell, B., Mellema, D., Spletzer, M., Raman, A.: Mode-selective noncontact excitation of microcantilevers and microcantilever 159 arrays in air using the ultrasound radiation force. Appl. Phys. Lett. 97, 214101 (2010)
Fatemi, M., Greenleaf, J.: Ultrasound-simulated vibro-acoustic spectrography. Science 280, 83–85 (1998)
Richardson, M.: Is it a mode shape, or an operating deflection shape? Sound Vib. 31, 1–11 (1997)
Huber, T., Fatemi, M., Kinnick, R., Greenleaf, J.: Noncontact modal analysis of a pipe organ reed using airborne ultrasound stimulated 163 vibrometry. J. Acoust. Soc. Am 119(4), 2476–2482 (2006)
Huber, T., Calhoun, D., Fatemi, M., Kinnick, R., Greenleaf, J.: Noncontact modal testing of hard-drive suspensions using ultrasound radiation force. In: Proceedings of IMAC XXIV, Louis, Missouri, USA, Jan. 30–Feb. 2, 2005
Huber, T., Beaver, N., Helps, J.: Noncontact modal excitation of a classical guitar using ultrasound radiation force. Exp. Tech. 37, 38–46 (2013)
Roozen, N., Nuij, P., Nijmeijer, H.: Sonic excitation by means of ultrasound: an experimental illustration of acoustic radiation force. In: Proceedings of Forum Acusticum 2011, Aalborg, Denmark, June 2011
Silva, G., Chen, S., Greenleaf, J., Fatemi, M.: Dynamic ultrasound radiation force in fluids. Phys. Rev. E 71, 056617 (2005)
Mitri, F., Fatemi, M.: Dynamic acoustic radiation force acting on cylindrical shells: theory and simulations. Ultrasonics 43, 435–445 (2005)
Blackstock, D.: Fundamentals of Physical Acoustics, John Wiley & Sons, New York, pp. 441–442 (2000)
Non-contact Ultrasound, Ultran Group, State College, PA
Polytec Scanning Laser Doppler Vibrometer, Polytec Optical Measurement Systems, Waldbronn, Germany
TREK Model PZD700, High Voltage Power Amplifier/Piezo Driver, TREK Inc., Lockport, New York
PCB Model 378C01, PCB Piezotronics Inc., Depew, NY
LMS Test.Lab – Leuven Measurement Systems, Leuven, Belgium
MATLAB - Matrix Analysis Software, The MathWorks, Inc., Natick, MA
Acknowledgements
The work presented herein was funded by the NSF Civil, Mechanical and Manufacturing Innovation (CMMI) Grant No. 1266019 entitled “Collaborative Research: Enabling Non-contact Structural Dynamic Identification with Focused Ultrasound Radiation Force”. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the particular funding agency. The authors are grateful for the support obtained. We are also indebted to some of the Ph.D. Students at the Structural Dynamics and Acoustic Systems Lab, in particular, Tina Dardeno and Patrick Logan for helpful discussion throughout the work and Peyman Poozesh for helping setting up part of the testing equipments.
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© 2016 The Society for Experimental Mechanics, Inc.
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Chen, S., Niezrecki, C., Avitabile, P. (2016). Experimental Mapping of the Acoustic Field Generated by Ultrasonic Transducers. In: De Clerck, J., Epp, D. (eds) Rotating Machinery, Hybrid Test Methods, Vibro-Acoustics & Laser Vibrometry, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-30084-9_23
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DOI: https://doi.org/10.1007/978-3-319-30084-9_23
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