Guided-wave signal processing using chirplet matching pursuits and mode correlation for structural health monitoring
Ajay Raghavan,Carlos E. S. Cesnik +1 more
- Vol. 6174, pp 395-406
TLDR
In this article, a chirplet matching pursuit algorithm was proposed to isolate individual reflections from defects in the structure and estimate the time-frequency centers, the modes and individual energies of the reflections, which would be used to locate and characterize defects.Abstract:
Signal processing algorithms for guided wave pulse echo-based SHM must be capable of isolating individual reflections from defects in the structure, if any, which could be overlapping and multimodal. In addition, they should be able to estimate the time-frequency centers, the modes and individual energies of the reflections, which would be used to locate and characterize defects. Finally, they should be computationally efficient and amenable to automated processing. This work addresses these issues with a new algorithm employing chirplet matching pursuits followed by a mode correlation check for single point sensors. Its theoretical advantages over conventional time-frequency representations in all aspects are elaborated and these are demonstrated using numerical simulations and experiments in isotropic plate structures. The issue of in-plane triangulation is then discussed and experimental work done to explore this issue is presented. This work concludes with a description of how the algorithm can be extended to composite plate structures.read more
Citations
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Journal ArticleDOI
Effects of Elevated Temperature on Guided-wave Structural Health Monitoring
TL;DR: In this article, the authors used surface-bonded piezoelectric wafer transducers in metallic plates for the temperature range encountered in internal spacecraft structures (20-150°C).
Journal ArticleDOI
Ultrasonic guided-waves characterization with Warped Frequency Transforms
TL;DR: The proposed ldquoWarped Frequency Transformrdquo (WFT) is based on a time-frequency domain tiling chosen to match the spectro-temporal structure of the different propagating guided waves by selecting an appropriate warping map which generates non-linearly frequency modulated atoms.
Journal ArticleDOI
Sparse signal representation and its applications in ultrasonic NDE.
TL;DR: The advantages and limitations of SSR algorithms and various overcomplete dictionaries widely-used in ultrasonic NDE applications are explored in depth and their performance improvement compared to conventional signal processing methods in many applications such as ultrasonic flaw detection and noise suppression, echo separation and echo estimation, and ultrasonic imaging is investigated.
Journal ArticleDOI
Guided wave excitation by a CLoVER transducer for structural health monitoring: theory and experiments
Ken I. Salas,Carlos E. S. Cesnik +1 more
TL;DR: In this article, a composite long-range variable-direction emitting radar (CLoVER) transducer is proposed to capture the multimodal nature of the guided wave (GW) field excited by a wedge-shaped anisotropic piezocomposite transducers.
Journal ArticleDOI
Damage identification for composite structures using a cross-correlation reverse-time migration technique:
TL;DR: In this article, a reverse-time migration technique to image damage by cross-correlating forward and backward propagating wavefields in composite structures using flexural wave signals is presented.
References
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Journal ArticleDOI
Matching pursuits with time-frequency dictionaries
Stéphane Mallat,Zhifeng Zhang +1 more
TL;DR: The authors introduce an algorithm, called matching pursuit, that decomposes any signal into a linear expansion of waveforms that are selected from a redundant dictionary of functions, chosen in order to best match the signal structures.
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