A New Method of Acoustical Remote Evaluation of Defective Structures and Material Characterization

Document type: Conference Papers
Peer reviewed: Yes
Author(s): Etienne Mfoumou, Claes Hedberg, Sharon Kao-Walter, S. Narayanswamy
Title: A New Method of Acoustical Remote Evaluation of Defective Structures and Material Characterization
Conference name: 2007 CAA Annual Conference
Year: 2007
Pagination: 148-149
ISBN: 0711-6659
Publisher: Canadian Acoustical Association
Organization: Blekinge Institute of Technology
Department: School of Engineering - Dept. of Mechanical Engineering (Sektionen för teknik – avd. för maskinteknik)
School of Engineering S- 371 79 Karlskrona
+46 455 38 50 00
http://www.bth.se/ing/
Language: English
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.
Subject: Mechanical Engineering\Structural Dynamics
Mechanical Engineering\Structural Mechanics
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