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Time delay comb transducers for aircraft inspection

Published online by Cambridge University Press:  03 February 2016

F. Yan  and
J. L. Rose
F. Yan
Affiliation:
[email protected], Department of Engineering Science and Mechanics, Pennsylvania State University, PA, USA
J. L. Rose
Affiliation:
[email protected], Department of Engineering Science and Mechanics, Pennsylvania State University, PA, USA, and FBS Inc, State College, PA, USA
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Abstract

An ultrasonic guided wave technique based on time delay comb transducers is introduced for aircraft inspection. It is demonstrated that for isotropic plate structures the time delay comb transducers with appropriate excitation are capable of performing discontinuity detections without knowing the precise isotropic material properties of the objects being inspected. Fibre-reinforced composite plates are also considered. The wave skew effects are investigated using both the slowness curve and the Poynting vector. A composite inspection technique that takes advantage of the skew effects is proposed. Using time delay comb transducers to excite the guided wave modes with different skew angles, the proposed technique is capable of scanning the composite plate in different directions without moving or rotating the transducers. By contrast with the applications in the isotropic cases, knowledge of the material properties and other necessary information that is needed to produce dispersion curves is generally required. Experimental results are provided as a validation of the proposed techniques.

Type
Research Article
Information
The Aeronautical Journal , Volume 113 , Issue 1144: Flight structures fundamental research in the United States of America: A Special Issue , June 2009 , pp. 417 - 427
Copyright
Copyright © Royal Aeronautical Society 2009 

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