{"id":{"repo_id":"rgu","oai_identifier":"oai:rgu-repository.worktribe.com:3476085"},"canonical_url":"https://search.dev.ndltd.org/etd/rgu/oai:rgu-repository.worktribe.com:3476085","repository":{"repo_id":"rgu","name":"Robert Gordon University","base_url":"https://rgu-repository.worktribe.com/oaiprovider"},"display":{"title":"Analysis of wave propagation in pipeline and plate-like structures for surface and interface condition assessment.","abstract":"This research aims to investigate changes in wave propagation characteristics in single and multilayer pipeline and plate-like structures, with the goal of supporting surface and interface condition assessment. Interface degradation in multilayer structures is a critical issue across various industries (e.g., oil and gas, subsea, nuclear) often remaining undetected until the outer layer is removed. This can lead to safety risks, unexpected failures and production losses. A range of preventive and inspection methods is available to monitor surface and interface structural degradation; each approach has its own limitations. Acoustic emission (AE) is a non-destructive testing and monitoring technique capable of detecting structural failure and degradation. The AE technique involves monitoring elastic waves and strain energy released by localised sources within a material, such as crack initiation, crack growth, plastic deformation, or other forms of structural degradation. These waves are detected by AE sensors placed at various distances from the AE source on the surface of the structure. In this experimental work, AE sensors and pencil lead break (PLB) test as a point source are used. The first part of this study investigates wave propagation of metallic (mild steel) pipelines and plates under different surface conditions (i.e., coated, partially corroded and fully corroded). In second part focuses on the analysis of wave parameters and changes in wave characteristics originating from different source points and layers within experimental samples. Additionally, it examines how wave propagation is affected in plates attached to different layers, including coatings, rubber sheet and metallic overlays. Signal processing and data analysis are conducted using various AE parameter, including energy level, energy ratio, wave velocity, and wavelet transform (WT). The results highlight distinct wave propagation characteristics in different conditions and structural configurations. AE hits originating from a PLB source and propagating through the coated conditions, such as epoxy phenolic coated pipeline (4.33 e-06 V2s) and epoxy phenolic coated plate (2.56 e-06 V2s), as well as in corroded conditions - such as the corroded pipeline (3.58 e-06 V2s) and corroded plate (2.23 e-06 V2s) exhibited lower energy compared to AE hits propagating to bare conditions, which had energy values of 2.97 e-05 V2s for bare pipeline and 7.78 e-06 V2s for the bare plate. AE parameters are also significantly affected by the surface conditions, example of as seen in the decay time of the bare pipeline (0.00454 s) compared to the coated pipeline (0.00157 s). Notably, the symmetric and antisymmetric wave velocities are changes with each experimental sample surface condition. Furthermore, the results revealing how wave propagation and characteristics are influenced by each layer on the sample surface. This study enhances understanding of wave propagation in plate and pipeline-like structures and provides practical insights into selecting frequency ranges, and sensor positions for detecting failures. The findings support the advancement of AE based monitoring strategies for applications such as corrosion under insulation (CUI) and other multilayer related degradation monitoring.","abstract_html":"This research aims to investigate changes in wave propagation characteristics in single and multilayer pipeline and plate-like structures, with the goal of supporting surface and interface condition assessment. Interface degradation in multilayer structures is a critical issue across various industries (e.g., oil and gas, subsea, nuclear) often remaining undetected until the outer layer is removed. This can lead to safety risks, unexpected failures and production losses. A range of preventive and inspection methods is available to monitor surface and interface structural degradation; each approach has its own limitations. Acoustic emission (AE) is a non-destructive testing and monitoring technique capable of detecting structural failure and degradation. The AE technique involves monitoring elastic waves and strain energy released by localised sources within a material, such as crack initiation, crack growth, plastic deformation, or other forms of structural degradation. These waves are detected by AE sensors placed at various distances from the AE source on the surface of the structure. In this experimental work, AE sensors and pencil lead break (PLB) test as a point source are used. The first part of this study investigates wave propagation of metallic (mild steel) pipelines and plates under different surface conditions (i.e., coated, partially corroded and fully corroded). In second part focuses on the analysis of wave parameters and changes in wave characteristics originating from different source points and layers within experimental samples. Additionally, it examines how wave propagation is affected in plates attached to different layers, including coatings, rubber sheet and metallic overlays. Signal processing and data analysis are conducted using various AE parameter, including energy level, energy ratio, wave velocity, and wavelet transform (WT). The results highlight distinct wave propagation characteristics in different conditions and structural configurations. AE hits originating from a PLB source and propagating through the coated conditions, such as epoxy phenolic coated pipeline (4.33 e-06 V2s) and epoxy phenolic coated plate (2.56 e-06 V2s), as well as in corroded conditions - such as the corroded pipeline (3.58 e-06 V2s) and corroded plate (2.23 e-06 V2s) exhibited lower energy compared to AE hits propagating to bare conditions, which had energy values of 2.97 e-05 V2s for bare pipeline and 7.78 e-06 V2s for the bare plate. AE parameters are also significantly affected by the surface conditions, example of as seen in the decay time of the bare pipeline (0.00454 s) compared to the coated pipeline (0.00157 s). Notably, the symmetric and antisymmetric wave velocities are changes with each experimental sample surface condition. Furthermore, the results revealing how wave propagation and characteristics are influenced by each layer on the sample surface. This study enhances understanding of wave propagation in plate and pipeline-like structures and provides practical insights into selecting frequency ranges, and sensor positions for detecting failures. The findings support the advancement of AE based monitoring strategies for applications such as corrosion under insulation (CUI) and other multilayer related degradation monitoring.","abstract_has_math":false,"creators":["Rajendran, Vinooth"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["N. Faisal, A. Prathuru and C. Fernandez"],"committee_chairs":[],"committee_members":[],"year":2026,"date_issued":"2026","date_published":"2026","updated_at":"2026-07-24T04:10:14Z","subjects":["Acoustic emissions (AE)","Wave propagation","Multilayer structures","Corrosion under insulation (CUI)","Non-destructive testing (NDT)","Structural health monitoring"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:rgu-repository.worktribe.com:3476085","https://doi.org/10.48526/rgu-wt-3476085"],"render_values":[{"text":"oai:rgu-repository.worktribe.com:3476085","href":null,"code":true},{"text":"https://doi.org/10.48526/rgu-wt-3476085","href":"https://doi.org/10.48526/rgu-wt-3476085","code":true}]},{"key":"dc:creator.authoridentifier","label":"Author Identifier","values":["0000-0002-3432-7672"],"render_values":[{"text":"0000-0002-3432-7672","href":"https://orcid.org/0000-0002-3432-7672","code":true}]}]},"links":{"outbound_url":"https://rgu-repository.worktribe.com/3476085/1/RAJENDRAN%202026%20Analysis%20of%20wave%20propagation","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["N. Faisal, A. Prathuru and C. Fernandez"]},{"key":"dc:contributor.sponsor","label":"Sponsor","values":["No Funder Acknowledged (Outputs)"]},{"key":"dc:creator","label":"Author","values":["Rajendran, Vinooth"]},{"key":"dc:creator.authoridentifier","label":"Author Identifier","values":["0000-0002-3432-7672"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2026-02-28"]},{"key":"dc:date.issued","label":"Date","values":["2026"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://rgu-repository.worktribe.com/output/3476085"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Acoustic emissions (AE)","Wave propagation","Multilayer structures","Corrosion under insulation (CUI)","Non-destructive testing (NDT)","Structural health monitoring"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:rgu-repository.worktribe.com:3476085","https://doi.org/10.48526/rgu-wt-3476085"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://rgu-repository.worktribe.com/3476085/1/RAJENDRAN%202026%20Analysis%20of%20wave%20propagation"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This research aims to investigate changes in wave propagation characteristics in single and multilayer pipeline and plate-like structures, with the goal of supporting surface and interface condition assessment. Interface degradation in multilayer structures is a critical issue across various industries (e.g., oil and gas, subsea, nuclear) often remaining undetected until the outer layer is removed. This can lead to safety risks, unexpected failures and production losses. A range of preventive and inspection methods is available to monitor surface and interface structural degradation; each approach has its own limitations. Acoustic emission (AE) is a non-destructive testing and monitoring technique capable of detecting structural failure and degradation. The AE technique involves monitoring elastic waves and strain energy released by localised sources within a material, such as crack initiation, crack growth, plastic deformation, or other forms of structural degradation. These waves are detected by AE sensors placed at various distances from the AE source on the surface of the structure. In this experimental work, AE sensors and pencil lead break (PLB) test as a point source are used. The first part of this study investigates wave propagation of metallic (mild steel) pipelines and plates under different surface conditions (i.e., coated, partially corroded and fully corroded). In second part focuses on the analysis of wave parameters and changes in wave characteristics originating from different source points and layers within experimental samples. Additionally, it examines how wave propagation is affected in plates attached to different layers, including coatings, rubber sheet and metallic overlays. Signal processing and data analysis are conducted using various AE parameter, including energy level, energy ratio, wave velocity, and wavelet transform (WT). The results highlight distinct wave propagation characteristics in different conditions and structural configurations. AE hits originating from a PLB source and propagating through the coated conditions, such as epoxy phenolic coated pipeline (4.33 e-06 V2s) and epoxy phenolic coated plate (2.56 e-06 V2s), as well as in corroded conditions - such as the corroded pipeline (3.58 e-06 V2s) and corroded plate (2.23 e-06 V2s) exhibited lower energy compared to AE hits propagating to bare conditions, which had energy values of 2.97 e-05 V2s for bare pipeline and 7.78 e-06 V2s for the bare plate. AE parameters are also significantly affected by the surface conditions, example of as seen in the decay time of the bare pipeline (0.00454 s) compared to the coated pipeline (0.00157 s). Notably, the symmetric and antisymmetric wave velocities are changes with each experimental sample surface condition. Furthermore, the results revealing how wave propagation and characteristics are influenced by each layer on the sample surface. This study enhances understanding of wave propagation in plate and pipeline-like structures and provides practical insights into selecting frequency ranges, and sensor positions for detecting failures. The findings support the advancement of AE based monitoring strategies for applications such as corrosion under insulation (CUI) and other multilayer related degradation monitoring."]},{"key":"dc:title","label":"Title","values":["Analysis of wave propagation in pipeline and plate-like structures for surface and interface condition assessment."]}]}],"canonical_facts":{"dc:contributor.advisor":["N. Faisal, A. Prathuru and C. Fernandez"],"dc:contributor.sponsor":["No Funder Acknowledged (Outputs)"],"dc:creator":["Rajendran, Vinooth"],"dc:creator.authoridentifier":["0000-0002-3432-7672"],"dc:date":["2026-02-28"],"dc:date.issued":["2026"],"dc:description.abstract":["This research aims to investigate changes in wave propagation characteristics in single and multilayer pipeline and plate-like structures, with the goal of supporting surface and interface condition assessment. Interface degradation in multilayer structures is a critical issue across various industries (e.g., oil and gas, subsea, nuclear) often remaining undetected until the outer layer is removed. This can lead to safety risks, unexpected failures and production losses. A range of preventive and inspection methods is available to monitor surface and interface structural degradation; each approach has its own limitations. Acoustic emission (AE) is a non-destructive testing and monitoring technique capable of detecting structural failure and degradation. The AE technique involves monitoring elastic waves and strain energy released by localised sources within a material, such as crack initiation, crack growth, plastic deformation, or other forms of structural degradation. These waves are detected by AE sensors placed at various distances from the AE source on the surface of the structure. In this experimental work, AE sensors and pencil lead break (PLB) test as a point source are used. The first part of this study investigates wave propagation of metallic (mild steel) pipelines and plates under different surface conditions (i.e., coated, partially corroded and fully corroded). In second part focuses on the analysis of wave parameters and changes in wave characteristics originating from different source points and layers within experimental samples. Additionally, it examines how wave propagation is affected in plates attached to different layers, including coatings, rubber sheet and metallic overlays. Signal processing and data analysis are conducted using various AE parameter, including energy level, energy ratio, wave velocity, and wavelet transform (WT). The results highlight distinct wave propagation characteristics in different conditions and structural configurations. AE hits originating from a PLB source and propagating through the coated conditions, such as epoxy phenolic coated pipeline (4.33 e-06 V2s) and epoxy phenolic coated plate (2.56 e-06 V2s), as well as in corroded conditions - such as the corroded pipeline (3.58 e-06 V2s) and corroded plate (2.23 e-06 V2s) exhibited lower energy compared to AE hits propagating to bare conditions, which had energy values of 2.97 e-05 V2s for bare pipeline and 7.78 e-06 V2s for the bare plate. AE parameters are also significantly affected by the surface conditions, example of as seen in the decay time of the bare pipeline (0.00454 s) compared to the coated pipeline (0.00157 s). Notably, the symmetric and antisymmetric wave velocities are changes with each experimental sample surface condition. Furthermore, the results revealing how wave propagation and characteristics are influenced by each layer on the sample surface. This study enhances understanding of wave propagation in plate and pipeline-like structures and provides practical insights into selecting frequency ranges, and sensor positions for detecting failures. The findings support the advancement of AE based monitoring strategies for applications such as corrosion under insulation (CUI) and other multilayer related degradation monitoring."],"dc:identifier":["oai:rgu-repository.worktribe.com:3476085","https://doi.org/10.48526/rgu-wt-3476085"],"dc:identifier.uri":["https://rgu-repository.worktribe.com/3476085/1/RAJENDRAN%202026%20Analysis%20of%20wave%20propagation"],"dc:language":["en"],"dc:relation.isreferencedby":["https://rgu-repository.worktribe.com/output/3476085"],"dc:subject":["Acoustic emissions (AE)","Wave propagation","Multilayer structures","Corrosion under insulation (CUI)","Non-destructive testing (NDT)","Structural health monitoring"],"dc:title":["Analysis of wave propagation in pipeline and plate-like structures for surface and interface condition assessment."],"dc:type":["Thesis"]},"updated_at":"2026-07-24T04:10:14Z"}