{"id":104449,"date":"2018-03-11T10:27:29","date_gmt":"2018-03-11T10:27:29","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/lamb-a-simulation-tool-for-air-coupled-lamb-wawe-based-ultrasonic-nde-systems\/"},"modified":"2018-03-11T10:27:29","modified_gmt":"2018-03-11T10:27:29","slug":"lamb-a-simulation-tool-for-air-coupled-lamb-wawe-based-ultrasonic-nde-systems","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/electronica\/lamb-a-simulation-tool-for-air-coupled-lamb-wawe-based-ultrasonic-nde-systems\/","title":{"rendered":"Lamb: a simulation tool for air-coupled lamb wawe based ultrasonic nde systems\u00bb"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jos\u00e9 Luis Prego Borges <\/strong><\/h2>\n<p>Air-coupled ultrasonic lamb waves represent an important advance in non- destructive testing and evaluation (ndt &#038; nde) techniques of plate materials and structures. Examples of these advances are the characterization and quality  assessment of laminate materials in manufacturing processes, the location of  damaged parts in aircrafts and structure monitoring in the aerospace industry. however the rich and complex nature of mechanical vibrations encountered in  acoustics make the subject of analysis and study of these systems a very complex  task. Therefore a simulation tool that permits the evaluation and testing of different  configuration scenarios using the flexibility of a computer model is an invaluable aid  and advantage. the objective of this thesis is to provide the field of ndt with free open source  software i.E. The lamb matlabrtoolbox. The toolbox is capable of simulating the  behaviour of lamb wave based nde systems for single ideal isotropic laminates  using air-coupled ultrasonic arrays. The programme usesa pitch-catch type of a c- scan nde arrangement and is composed of three integrated sections each  individually modelling a feature in the system: 1) excitation, 2) propagation, and 3)  reception. for assessment of the individual modules of the toolbox the thesis presents comparisons between each section simulations and the data obtained from different  acoustic experiments. The validation of the complete simulator was carried out by  evaluation tests on the copper and aluminium plates by use of a real hardware  prototype of a lamb wave based nde system with aircoupled concave arrays. the negative impact on the performance of the real air-coupled nde systembased  on concave arrays was effectively confirmed by the programme. This was produced by the inherent directivity of the individual sensors as well as their concave arrangement. To emulate this behaviour the thesis introduces a simple two-dimensional geometric model for the inclusion of the spatial filtering effect of the sensors plus a group of simulations for a new proposed air-coupled plane array transducer. the software also verified the spatial coherent nature of the lamb wave fields emitted by a plate in air. This was demonstrated by the implementation of a delay  and sum beamformer to constitute an initial signal processing stage in the reception  section. the main purpose of the present work was to contribute a working scenario for the  simulation and testing of new air-coupled array designs and the development of enhanced signal processing techniques for the analysis of lamb waves fields  encountered in non-contact nde of single isotropic systems. finally, although the issue related to the calibration of the programme wasnot  attainable a reasonable degree of similarity with real nde data was achieved.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Lamb: a simulation tool for air-coupled lamb wawe based ultrasonic nde systems\u00bb<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Lamb: a simulation tool for air-coupled lamb wawe based ultrasonic nde systems\u00bb <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jos\u00e9 Luis Prego Borges <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/10\/2010<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Miguel Garc\u00eda Hern\u00e1ndez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Antonio Ramos fernandez <\/li>\n<li>Carlos Fritsch yusta (vocal)<\/li>\n<li>  (vocal)<\/li>\n<li>  (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jos\u00e9 Luis Prego Borges Air-coupled ultrasonic lamb waves represent an important advance in non- destructive testing and [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"footnotes":""},"categories":[2675,5877,15596,5189],"tags":[84775,83016,211099,80204],"class_list":["post-104449","post","type-post","status-publish","format-standard","hentry","category-electronica","category-modelos-numericos-de-la-atmosfera","category-politecnica-de-catalunya","category-ultrasonidos","tag-antonio-ramos-fernandez","tag-carlos-fritsch-yusta","tag-jose-luis-prego-borges","tag-miguel-garcia-hernandez"],"_links":{"self":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/104449","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/comments?post=104449"}],"version-history":[{"count":0,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/posts\/104449\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/media?parent=104449"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/categories?post=104449"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.deberes.net\/tesis\/wp-json\/wp\/v2\/tags?post=104449"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}