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Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances

The possibilities of an effective method of two adjacent signals are investigated for the evaluation of Lamb waves phase velocity dispersion in objects of different types, namely polyvinyl chloride (PVC) film and wind turbine blade (WTB). A new algorithm based on peaks of spectrum magnitude is prese...

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Autores principales: Draudvilienė, Lina, Tumšys, Olgirdas, Raišutis, Renaldas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8622519/
https://www.ncbi.nlm.nih.gov/pubmed/34832389
http://dx.doi.org/10.3390/ma14226990
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author Draudvilienė, Lina
Tumšys, Olgirdas
Raišutis, Renaldas
author_facet Draudvilienė, Lina
Tumšys, Olgirdas
Raišutis, Renaldas
author_sort Draudvilienė, Lina
collection PubMed
description The possibilities of an effective method of two adjacent signals are investigated for the evaluation of Lamb waves phase velocity dispersion in objects of different types, namely polyvinyl chloride (PVC) film and wind turbine blade (WTB). A new algorithm based on peaks of spectrum magnitude is presented and used for the comparison of the results. To use the presented method, the wavelength-dependent parameter is proposed to determine the optimal distance range, which is necessary in selecting two signals for analysis. It is determined that, in the range of 0.17–0.5 wavelength where [Formula: see text] is not higher than 5%, it is appropriate to use in the case of an A(0) mode in PVC film sample. The smallest error of 1.2%, in the distance greater than 1.5 wavelengths, is obtained in the case of the S(0) mode. Using the method of two signals analysis for PVC sample, the phase velocity dispersion curve of the A(0) mode is reconstructed using selected distances x(1) = 70 mm and x(2) = 70.5 mm between two spatial positions of a receiving transducer with a mean relative error [Formula: see text] , and for S(0) mode, x(1) = 61 mm and x(2) = 79.7 mm with [Formula: see text]. In the case of the WTB sample, the range of 0.1–0.39 wavelength, where [Formula: see text] is not higher than 3%, is determined as the optimal distance range between two adjacent signals. The phase velocity dispersion curve of the A(0) mode is reconstructed in two frequency ranges: first, using selected distances x(1) = 225 mm and x(2) = 231 mm with mean relative error [Formula: see text]; and second, x(1) = 225 mm and x(2) = 237 mm with [Formula: see text].
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spelling pubmed-86225192021-11-27 Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances Draudvilienė, Lina Tumšys, Olgirdas Raišutis, Renaldas Materials (Basel) Article The possibilities of an effective method of two adjacent signals are investigated for the evaluation of Lamb waves phase velocity dispersion in objects of different types, namely polyvinyl chloride (PVC) film and wind turbine blade (WTB). A new algorithm based on peaks of spectrum magnitude is presented and used for the comparison of the results. To use the presented method, the wavelength-dependent parameter is proposed to determine the optimal distance range, which is necessary in selecting two signals for analysis. It is determined that, in the range of 0.17–0.5 wavelength where [Formula: see text] is not higher than 5%, it is appropriate to use in the case of an A(0) mode in PVC film sample. The smallest error of 1.2%, in the distance greater than 1.5 wavelengths, is obtained in the case of the S(0) mode. Using the method of two signals analysis for PVC sample, the phase velocity dispersion curve of the A(0) mode is reconstructed using selected distances x(1) = 70 mm and x(2) = 70.5 mm between two spatial positions of a receiving transducer with a mean relative error [Formula: see text] , and for S(0) mode, x(1) = 61 mm and x(2) = 79.7 mm with [Formula: see text]. In the case of the WTB sample, the range of 0.1–0.39 wavelength, where [Formula: see text] is not higher than 3%, is determined as the optimal distance range between two adjacent signals. The phase velocity dispersion curve of the A(0) mode is reconstructed in two frequency ranges: first, using selected distances x(1) = 225 mm and x(2) = 231 mm with mean relative error [Formula: see text]; and second, x(1) = 225 mm and x(2) = 237 mm with [Formula: see text]. MDPI 2021-11-18 /pmc/articles/PMC8622519/ /pubmed/34832389 http://dx.doi.org/10.3390/ma14226990 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Draudvilienė, Lina
Tumšys, Olgirdas
Raišutis, Renaldas
Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title_full Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title_fullStr Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title_full_unstemmed Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title_short Reconstruction of Lamb Wave Dispersion Curves in Different Objects Using Signals Measured at Two Different Distances
title_sort reconstruction of lamb wave dispersion curves in different objects using signals measured at two different distances
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8622519/
https://www.ncbi.nlm.nih.gov/pubmed/34832389
http://dx.doi.org/10.3390/ma14226990
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AT raisutisrenaldas reconstructionoflambwavedispersioncurvesindifferentobjectsusingsignalsmeasuredattwodifferentdistances