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Calibration Techniques for Non-contacting Force Excitation Part 1: Frequency Domain Methods

  • Patrick LoganEmail author
  • Peter Avitabile
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Experimental characterization of the higher frequency modes of a structure presents challenges due to the frequency limitations of traditional excitation techniques. Non-contact excitation via low power ultrasonic transducer presents the possibility of exciting higher frequencies not currently possible with shakers or impact hammers. However, quantification of the actual force applied by the ultrasonic transducer requires that a relationship between the ultrasonic pressure field and the voltage driving the transducer be established.

In part 1 of this paper, calibration techniques shall be explored using spectral domain techniques with conventional instrumentation before extending the techniques to the ultrasonic transducer. Frequency response functions generated from uncalibrated excitation transducers shall be compared with those generated from calibrated equipment to determine an appropriate sensitivity for the uncalibrated transducers. Reciprocal measurements shall also be examined as a means of calibrating transducers. Time domain techniques for calibration shall be examined in part 2 of this paper.

Keywords

Non-contact excitation High frequency excitation Non-intrusive excitation Ultrasonic transducer Calibration methods 

Notes

Acknowledgements

Some of the work presented herein was partially funded by 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.

References

  1. 1.
    Avitabile, P.: Can you describe reciprocity? It just doesn’t make sense to me. SEM Exp. Tech. (2008).Google Scholar
  2. 2.
    Model 086E80 ICP® impact hammer installation and operating manual. PCB Piezotronics. (2007).Google Scholar
  3. 3.
    Polytec scanning laser Doppler vibrometer. Polytec. Opt. Meas. Syst.Google Scholar
  4. 4.
    LMS Test. Lab—Leuven Measurement Systems, Leuven, Belgium.Google Scholar

Copyright information

© The Society of Experimental Mechanics, Inc. 2016

Authors and Affiliations

  1. 1.Structural Dynamics and Acoustic Systems LaboratoryUniversity of Massachusetts LowellLowellUSA

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