Lamb wave dispersion time-domain study using a combined signal processing approach

Title

Lamb wave dispersion time-domain study using a combined signal processing approach

 Author

Ochoa, P.
Groves, R.M.
Benedictus, R.

Faculty

Aerospace Engineering

 Department

Aerospace Structures & Materials

 Date

2015-12-31

 Abstract

Ultrasonic Lamb wave techniques are described as one of the most encouraging developments for structural health monitoring of aerospace composite structures. The reliability of those techniques is highly dependent on the quality of signal processing algorithms capable of extracting useful information out of complex responses. When damage localization is involved, it is crucial to rigorously determine time-of-flight (TOF) of wave groups. Among the available methods for automated TOF extraction the Akaike Information Criterion (AIC) and the Hilbert Transform (HT) have become very popular. The first one detects the onsettime of a signal based on the minimization of the AIC function. The second one relies on the HT to define the response envelope, allowing maximum amplitude points to be used for time interval measurement. This paper focuses primarily on comparing the aforementioned methods in order to assess their reliability for TOF determination. Additionally, a combined AIC-HT approach is used to further quantify Lamb wave dispersion phenomena.

 To reference this document use:

http://resolver.tudelft.nl/uuid:9a1e402f-af91-429b-92dd-a631e9da56ca

 Publisher

Vrije Universiteit Brussel

 Source

Proceedings of the 6th international conference on emerging technologies in non-destructive testing, Brussels, Belgium, 27-29 May 2015

 Part of collection

Institutional Repository

 Document type

conference paper

 Rights

(c) 2015
Ochoa, P.
Groves, R.M.
Benedictus, R.
Files
PDF 320415.pdf 1.16 MB
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