A new method of acoustical remote evaluation of defective structures and material characterization

Authors

  • E. Mfoumou Dept. of Mech. Eng., Blekinge Institute of Technology, SE 371 79, Karlskrona, Sweden
  • C. Hedberg Dept. of Mech. Eng., Blekinge Institute of Technology, SE 371 79, Karlskrona, Sweden
  • C. Kao-Walter Dept. of Mech. Eng., Blekinge Institute of Technology, SE 371 79, Karlskrona, Sweden
  • S. Narayanswamy Dept. of Mech. and Ind. Eng., Concordia University, 1515 St. Catherine W., Montreal, Que. H3G2W1, Canada

Keywords:

Laser Doppler velocimeters, Loudspeakers, Nondestructive examination, Remote control, Voltage control, Input voltage, Laser vibrometers, Surface vibrational response

Abstract

The feasibility of a remote monitoring of structures for a progressive damage assessment as well as material characterization using a simple and inexpensive experimental setup is discussed. The method is based on a remote acoustic excitation of transverse vibrations on a membrane using an ordinary broadband low frequency loudspeaker, and the measurement of the response using a Laser Doppler Vibrometer (LDV). Theoretical modeling is also developed to correlate the experimental results obtained, and this yields a new method for Non Destructive Testing (NDT) of sheet-like materials. The function generator provides an input voltage of a sine signal to the loudspeaker, and laser detection of the surface vibrational response of the sample is accomplished with the laser vibrometer.

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Published

2007-09-01

How to Cite

1.
Mfoumou E, Hedberg C, Kao-Walter C, Narayanswamy S. A new method of acoustical remote evaluation of defective structures and material characterization. Canadian Acoustics [Internet]. 2007 Sep. 1 [cited 2021 Oct. 20];35(3):148-9. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1944

Issue

Section

Proceedings of the Acoustics Week in Canada