Uso das ondas de Lamb e Scholte para caracterização de líquidos

Detalhes bibliográficos
Autor(a) principal: Oliveira, Aline Emy Takiy de [UNESP]
Data de Publicação: 2015
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/132242
http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/29-10-2015/000853520.pdf
Resumo: The study of the interaction of elastic waves in solids immersed in a fluid has been recognized as a suitable method for fluid characterization. Guided waves in plate-like structures, are mul- timodal and dispersive. These characteristics provides more information in the measurement process. In addition, the theoretical analysis and physical interpretation of the experimental results become more involved. When the plate is in contact with a fluid, there is strong attenu- ation due to Leaky waves and viscous losses in the fluid. This characteristic can be explored for the fluid characterization, due to the high sensitivity associated to the interaction between the wave and fluid. From this feature a study about the quasi-Scholte mode was done, which is a kind of interface wave and its wave energy in the fluid is confined in the region close to the surface of the plate. The analysis of this propagating mode is an attractive alternative to determine the bulk longitudinal velocity and attenuation in the liquid, which provide valuable information about the liquid properties. In this work, guided waves (Lamb and quasi-Scholte modes) are theoretically described by a system of equations obtained by modeling a homo- genous solid plate in contact with a viscous fluid, which is modeled using the Navier-Stokes equation. The dispersion and attenuation curves of Lamb waves and quasi Scholte mode are numerically calculated from the characteristic equations. Experimental measurements were conducted in order to obtain the phase velocity and attenuation for the Lamb waves and quasi Scholte mode showing the existence of low attenuation frequencies bands. These measurements were obtained by using longitudinal wide band transducers coupled to acrylic wedges, excited with senoidal pulses and then time-frequency analysed. In order to evaluate the potential use of this result in NDT applications ultrasonic images were also ...
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spelling Uso das ondas de Lamb e Scholte para caracterização de líquidosLamb, Ondas deUltrassomGuias de ondasLiquidosViscosidadeWave guidesThe study of the interaction of elastic waves in solids immersed in a fluid has been recognized as a suitable method for fluid characterization. Guided waves in plate-like structures, are mul- timodal and dispersive. These characteristics provides more information in the measurement process. In addition, the theoretical analysis and physical interpretation of the experimental results become more involved. When the plate is in contact with a fluid, there is strong attenu- ation due to Leaky waves and viscous losses in the fluid. This characteristic can be explored for the fluid characterization, due to the high sensitivity associated to the interaction between the wave and fluid. From this feature a study about the quasi-Scholte mode was done, which is a kind of interface wave and its wave energy in the fluid is confined in the region close to the surface of the plate. The analysis of this propagating mode is an attractive alternative to determine the bulk longitudinal velocity and attenuation in the liquid, which provide valuable information about the liquid properties. In this work, guided waves (Lamb and quasi-Scholte modes) are theoretically described by a system of equations obtained by modeling a homo- genous solid plate in contact with a viscous fluid, which is modeled using the Navier-Stokes equation. The dispersion and attenuation curves of Lamb waves and quasi Scholte mode are numerically calculated from the characteristic equations. Experimental measurements were conducted in order to obtain the phase velocity and attenuation for the Lamb waves and quasi Scholte mode showing the existence of low attenuation frequencies bands. These measurements were obtained by using longitudinal wide band transducers coupled to acrylic wedges, excited with senoidal pulses and then time-frequency analysed. In order to evaluate the potential use of this result in NDT applications ultrasonic images were also ...O estudo da interação de ondas elásticas em sólidos imersos em um fluido tem sido reconhe- cido como um meio viável para caracterização de líquidos. As ondas guiadas em estruturas tipo placa possuem a característica de serem multimodais e dispersivas. Estas características introduzem mais informação ao processo de medição, além de tornar a análise teórica e a inter- pretação física dos resultados experimentais mais envolventes. Quando a placa está em contato com o fluido, há uma forte atenuação devido às ondas de fuga e perdas viscosas no fluido. Esta característica pode ser explorada para a caracterização de líquidos, devido à alta sensibilidade associada à interação entre a onda e o fluido. Pensando nesta particularidade estudou-se o modo quase Scholte, que é um tipo de onda de interface cuja energia está confinada perto da região da superfície da placa. A análise deste modo propagante é uma alternativa atraente para se determinar a velocidade volumétrica longitudinal e a atenuação no líquido, o que proporciona valiosas informações sobre as propriedades do fluido. Neste trabalho, as ondas guiadas (mo- dos de Lamb e quase Scholte) são teoricamente descritas por um sistema de equações obtido do modelamento de uma placa sólida homogênea em contato com um fluido viscoso, o qual é descrito usando a equação de Navier-Stokes. As curvas de dispersão e atenuação das ondas de Lamb e do modo quase Scholte são obtidos numericamente como soluções das equações carac- terísticas. Experimentos foram realizados visando mensurar a velocidade de fase e a atenuação para os modos de Lamb e quase Scholte, mostrando a existência de bandas de frequências de baixa atenuação. Estas medições foram obtidas usando transdutores longitudinais de banda larga acoplados a prismas de acrílico, excitados com pulsos senoidais e posteriormente analisa- dos em tempo-frequênciaUniversidade Estadual Paulista (Unesp)Kitano, Cláudio [UNESP]Segura, Luis Elvira [UNESP]Universidade Estadual Paulista (Unesp)Oliveira, Aline Emy Takiy de [UNESP]2015-12-10T14:24:52Z2015-12-10T14:24:52Z2015-05-29info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesis123 p. : il. color.application/pdfOLIVEIRA, Aline Emy Takiy de. Uso das ondas de Lamb e Scholte para caracterização de líquidos. 2015. 123 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015.http://hdl.handle.net/11449/132242000853520http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/29-10-2015/000853520.pdf33004099080P028834403518951670000-0001-6320-755XAlephreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporinfo:eu-repo/semantics/openAccess2024-01-26T06:30:35Zoai:repositorio.unesp.br:11449/132242Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-01-26T06:30:35Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Uso das ondas de Lamb e Scholte para caracterização de líquidos
title Uso das ondas de Lamb e Scholte para caracterização de líquidos
spellingShingle Uso das ondas de Lamb e Scholte para caracterização de líquidos
Oliveira, Aline Emy Takiy de [UNESP]
Lamb, Ondas de
Ultrassom
Guias de ondas
Liquidos
Viscosidade
Wave guides
title_short Uso das ondas de Lamb e Scholte para caracterização de líquidos
title_full Uso das ondas de Lamb e Scholte para caracterização de líquidos
title_fullStr Uso das ondas de Lamb e Scholte para caracterização de líquidos
title_full_unstemmed Uso das ondas de Lamb e Scholte para caracterização de líquidos
title_sort Uso das ondas de Lamb e Scholte para caracterização de líquidos
author Oliveira, Aline Emy Takiy de [UNESP]
author_facet Oliveira, Aline Emy Takiy de [UNESP]
author_role author
dc.contributor.none.fl_str_mv Kitano, Cláudio [UNESP]
Segura, Luis Elvira [UNESP]
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Oliveira, Aline Emy Takiy de [UNESP]
dc.subject.por.fl_str_mv Lamb, Ondas de
Ultrassom
Guias de ondas
Liquidos
Viscosidade
Wave guides
topic Lamb, Ondas de
Ultrassom
Guias de ondas
Liquidos
Viscosidade
Wave guides
description The study of the interaction of elastic waves in solids immersed in a fluid has been recognized as a suitable method for fluid characterization. Guided waves in plate-like structures, are mul- timodal and dispersive. These characteristics provides more information in the measurement process. In addition, the theoretical analysis and physical interpretation of the experimental results become more involved. When the plate is in contact with a fluid, there is strong attenu- ation due to Leaky waves and viscous losses in the fluid. This characteristic can be explored for the fluid characterization, due to the high sensitivity associated to the interaction between the wave and fluid. From this feature a study about the quasi-Scholte mode was done, which is a kind of interface wave and its wave energy in the fluid is confined in the region close to the surface of the plate. The analysis of this propagating mode is an attractive alternative to determine the bulk longitudinal velocity and attenuation in the liquid, which provide valuable information about the liquid properties. In this work, guided waves (Lamb and quasi-Scholte modes) are theoretically described by a system of equations obtained by modeling a homo- genous solid plate in contact with a viscous fluid, which is modeled using the Navier-Stokes equation. The dispersion and attenuation curves of Lamb waves and quasi Scholte mode are numerically calculated from the characteristic equations. Experimental measurements were conducted in order to obtain the phase velocity and attenuation for the Lamb waves and quasi Scholte mode showing the existence of low attenuation frequencies bands. These measurements were obtained by using longitudinal wide band transducers coupled to acrylic wedges, excited with senoidal pulses and then time-frequency analysed. In order to evaluate the potential use of this result in NDT applications ultrasonic images were also ...
publishDate 2015
dc.date.none.fl_str_mv 2015-12-10T14:24:52Z
2015-12-10T14:24:52Z
2015-05-29
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 OLIVEIRA, Aline Emy Takiy de. Uso das ondas de Lamb e Scholte para caracterização de líquidos. 2015. 123 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015.
http://hdl.handle.net/11449/132242
000853520
http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/29-10-2015/000853520.pdf
33004099080P0
2883440351895167
0000-0001-6320-755X
identifier_str_mv OLIVEIRA, Aline Emy Takiy de. Uso das ondas de Lamb e Scholte para caracterização de líquidos. 2015. 123 p. Tese (doutorado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Engenharia, 2015.
000853520
33004099080P0
2883440351895167
0000-0001-6320-755X
url http://hdl.handle.net/11449/132242
http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/29-10-2015/000853520.pdf
dc.language.iso.fl_str_mv por
language por
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 123 p. : il. color.
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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