Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers

Detalhes bibliográficos
Autor(a) principal: Prado, Vander Teixeira [UNESP]
Data de Publicação: 2014
Tipo de documento: Tese
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/111127
Resumo: This thesis presents the study and implementation of non-destructive testing techniques of platelike structures using piezoelectric array transducers and guided acoustic waves, associated with beamforming techniques and image compounding methods. Damage detection in structures using guided waves and arrays is a promising research area, especially in the aerospace and energy fields, where the use of plate-like structures demands thorough inspection due to the high safety levels of operation. Guided acoustic waves techniques can be used to inspect relatively large areas without the necessity of moving the transducers, in a non-destructive way. There are different propagation modes that can be coupled to the plate, and each mode is sensitive to specific types of defects, like notches, delamination and surface defects. Wave propagation, different propagation modes and dispersion characteristics, as well as arrays characteristics and imaging algorithms, are studied. MATLAB and PZFlex simulations are used to get further insight in the theoretical aspects, to obtain dispersion curves, interaction with defects and array response. Experimental results validate the simulations with isotropic materials (aluminum). A 16-elements piezoelectric linear array is mounted at the border of an aluminum plate with artificial defects. The signals related to all combinations of transmit-receive pairs are obtained with burst excitation, for use with synthetic aperture (SA) techniques. The first contribution of this work is a method for defect detection based on the instantaneous phase of the aperture data. The instantaneous phase (IP) image is obtained by replacing the amplitude information by the instantaneous phase in the conventional SA beamforming. From the analysis of the IP image, a threshold level is proposed in terms of the number of signals used for imaging. This threshold is applied to the IP image, resulting ...
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spelling Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducersEnsaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricosTransdutores piezoeletricosPlacas (Engenharia)Testes não-destrutivosLamb, Ondas dePiezoelectric transducersThis thesis presents the study and implementation of non-destructive testing techniques of platelike structures using piezoelectric array transducers and guided acoustic waves, associated with beamforming techniques and image compounding methods. Damage detection in structures using guided waves and arrays is a promising research area, especially in the aerospace and energy fields, where the use of plate-like structures demands thorough inspection due to the high safety levels of operation. Guided acoustic waves techniques can be used to inspect relatively large areas without the necessity of moving the transducers, in a non-destructive way. There are different propagation modes that can be coupled to the plate, and each mode is sensitive to specific types of defects, like notches, delamination and surface defects. Wave propagation, different propagation modes and dispersion characteristics, as well as arrays characteristics and imaging algorithms, are studied. MATLAB and PZFlex simulations are used to get further insight in the theoretical aspects, to obtain dispersion curves, interaction with defects and array response. Experimental results validate the simulations with isotropic materials (aluminum). A 16-elements piezoelectric linear array is mounted at the border of an aluminum plate with artificial defects. The signals related to all combinations of transmit-receive pairs are obtained with burst excitation, for use with synthetic aperture (SA) techniques. The first contribution of this work is a method for defect detection based on the instantaneous phase of the aperture data. The instantaneous phase (IP) image is obtained by replacing the amplitude information by the instantaneous phase in the conventional SA beamforming. From the analysis of the IP image, a threshold level is proposed in terms of the number of signals used for imaging. This threshold is applied to the IP image, resulting ...Esta tese apresenta o estudo e implementação de técnicas de inspeção de estruturas delgadas tipo placa utilizando arrays de transdutores piezelétricos e ondas acústicas guiadas, associados a métodos de formação e composição de imagens. A detecção de danos em estruturas através de ondas guiadas e arrays de transdutores é um campo de pesquisa de grande importância, principalmente em áreas como a aeroespacial e de geração de energia, que utilizam estruturas delgadas e que exigem inspeção eficaz e completa, visando confiabilidade e segurança. O emprego de ondas acústicas guiadas permite inspecionar grandes áreas utilizando sensores sem a necessidade de realizar varreduras pela peça, de maneira não-destrutiva. Além disso, apresenta sensibilidade a diversos tipos de defeitos, como furos, corrosão, variação de espessura e defeitos superficiais. São estudados aspectos de propagação de ondas, diferentes modos de propagação e dispersão, assim como as principais características dos arrays e a formação de imagens. Os estudos teóricos são acompanhados por simulações usando os softwares MATLAB e PZFlex para obtenção dos modos de propagação das ondas, interação com defeitos e diagramas de radiação dos transdutores, cujos resultados são validados por meio da análise experimental em placas de materiais isotrópicos (alumínio). Montou-se um array linear de transdutores piezelétricos com 16 elementos na borda de uma placa de alumínio com defeitos artificiais. Os sinais provenientes de todas as possíveis combinações dos pares transmissor-receptor foram adquiridos para a utilização de técnicas de abertura sintética. A primeira contribuição deste trabalho é um método para detecção dos defeitos baseado na fase instantânea dos sinais. Substituindo-se a informação de amplitude dos sinais pela fase instantânea (IP) no método de formação de imagem, ...Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)FAPESP: 10/02240-0FAPESP: 10/16400-0FAPESP: 13/00330-0Universidade Estadual Paulista (Unesp)Higuti, Ricardo Tokio [UNESP]Martinez-Graullera, Oscar [UNESP]Universidade Estadual Paulista (Unesp)Prado, Vander Teixeira [UNESP]2014-12-02T11:16:56Z2014-12-02T11:16:56Z2014-09-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis124 p.application/pdfPRADO, Vander Teixeira. Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers =: Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos. 2014. 124 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho. Faculdade de Engenharia de Ilha Solteira, 2014.http://hdl.handle.net/11449/111127000799830000799830.pdf33004099080P064053395108832030000-0003-4201-5617Alephreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPenginfo:eu-repo/semantics/openAccess2024-08-05T17:57:39Zoai:repositorio.unesp.br:11449/111127Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T17:57:39Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos
title Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
spellingShingle Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
Prado, Vander Teixeira [UNESP]
Transdutores piezoeletricos
Placas (Engenharia)
Testes não-destrutivos
Lamb, Ondas de
Piezoelectric transducers
title_short Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
title_full Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
title_fullStr Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
title_full_unstemmed Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
title_sort Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers
author Prado, Vander Teixeira [UNESP]
author_facet Prado, Vander Teixeira [UNESP]
author_role author
dc.contributor.none.fl_str_mv Higuti, Ricardo Tokio [UNESP]
Martinez-Graullera, Oscar [UNESP]
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Prado, Vander Teixeira [UNESP]
dc.subject.por.fl_str_mv Transdutores piezoeletricos
Placas (Engenharia)
Testes não-destrutivos
Lamb, Ondas de
Piezoelectric transducers
topic Transdutores piezoeletricos
Placas (Engenharia)
Testes não-destrutivos
Lamb, Ondas de
Piezoelectric transducers
description This thesis presents the study and implementation of non-destructive testing techniques of platelike structures using piezoelectric array transducers and guided acoustic waves, associated with beamforming techniques and image compounding methods. Damage detection in structures using guided waves and arrays is a promising research area, especially in the aerospace and energy fields, where the use of plate-like structures demands thorough inspection due to the high safety levels of operation. Guided acoustic waves techniques can be used to inspect relatively large areas without the necessity of moving the transducers, in a non-destructive way. There are different propagation modes that can be coupled to the plate, and each mode is sensitive to specific types of defects, like notches, delamination and surface defects. Wave propagation, different propagation modes and dispersion characteristics, as well as arrays characteristics and imaging algorithms, are studied. MATLAB and PZFlex simulations are used to get further insight in the theoretical aspects, to obtain dispersion curves, interaction with defects and array response. Experimental results validate the simulations with isotropic materials (aluminum). A 16-elements piezoelectric linear array is mounted at the border of an aluminum plate with artificial defects. The signals related to all combinations of transmit-receive pairs are obtained with burst excitation, for use with synthetic aperture (SA) techniques. The first contribution of this work is a method for defect detection based on the instantaneous phase of the aperture data. The instantaneous phase (IP) image is obtained by replacing the amplitude information by the instantaneous phase in the conventional SA beamforming. From the analysis of the IP image, a threshold level is proposed in terms of the number of signals used for imaging. This threshold is applied to the IP image, resulting ...
publishDate 2014
dc.date.none.fl_str_mv 2014-12-02T11:16:56Z
2014-12-02T11:16:56Z
2014-09-15
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv PRADO, Vander Teixeira. Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers =: Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos. 2014. 124 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho. Faculdade de Engenharia de Ilha Solteira, 2014.
http://hdl.handle.net/11449/111127
000799830
000799830.pdf
33004099080P0
6405339510883203
0000-0003-4201-5617
identifier_str_mv PRADO, Vander Teixeira. Ultrasonic non-destructive testing of plate-like structures using piezoelectric array transducers =: Ensaios não-destrutivos por ultrassom de estruturas tipo placa utilizando arrays de transdutores piezelétricos. 2014. 124 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho. Faculdade de Engenharia de Ilha Solteira, 2014.
000799830
000799830.pdf
33004099080P0
6405339510883203
0000-0003-4201-5617
url http://hdl.handle.net/11449/111127
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 124 p.
application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
publisher.none.fl_str_mv Universidade Estadual Paulista (Unesp)
dc.source.none.fl_str_mv Aleph
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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