{"id":69689,"date":"2018-03-09T23:14:09","date_gmt":"2018-03-09T23:14:09","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/analisis-espectral-del-ruido-granular-para-la-extraccion-de-firmas-ultrasonicas\/"},"modified":"2018-03-09T23:14:09","modified_gmt":"2018-03-09T23:14:09","slug":"analisis-espectral-del-ruido-granular-para-la-extraccion-de-firmas-ultrasonicas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/politecnica-de-valencia\/analisis-espectral-del-ruido-granular-para-la-extraccion-de-firmas-ultrasonicas\/","title":{"rendered":"An\u00e1lisis espectral del ruido granular para la extracci\u00f3n de firmas ultras\u00f3nicas."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Jorge Gos\u00e1lbez Castillo <\/strong><\/h2>\n<p>El tratamiento digital de se\u00f1ales es hoy en d\u00eda un aspecto fundamental en el desarrollo de sistemas avanzados de ensayos no destructivos de materiales por ultrasonidos. Un \u00e1mbito espec\u00edfico es el de la extracci\u00f3n de informaci\u00f3n del denominado ruido granular ultras\u00f3nico, con el objetivo de caracterizar el material bajo an\u00e1lisis.  el ruido granular se genera por la superposici\u00f3n de m\u00faltiples ecos originados por la microestructura del material, cuando se inyecta en esta \u00faltimo un pulso ultras\u00f3nico de frecuencia adecuada. Dicho ruido admite un modelado estod\u00e1stico y puede aplicarse sobre \u00e9l t\u00e9cnicas de an\u00e1lisis espectral, para la extracci\u00f3n de par\u00e1metros que pueda currelarse con propiedades f\u00edsicas del material, permitiendo su caracterizaci\u00f3n. En esta tesis proponemos el concepto de firma ultras\u00f3nica, consistente en la curva de evoluaci\u00f3n de la frecuencia central del pulso ultras\u00f3nico inyectado en el material, a medida que se propaga por el interior del mismo. Dicha evoluci\u00f3n est\u00e1 vinculada a la forma en que progresivamente se aten\u00faan las diferentes componentes frecuenciales del especto del pulso. En general, lo hacen de forma diferente, lo que supone variaciones en el espectro y, en consecuencia, en su frecuencia central. Estas variaciones son inherentes a las caracter\u00edsticas del material y pueden permitir su caracterizaci\u00f3n.  la t\u00e9cnica de obtenci\u00f3n de la firma ultras\u00f3nica se realiza mediante un an\u00e1lisis (no estacionario) del ruido granular a cada profundidad y tiene dos aspectos claramente diferenciados: estimaci\u00f3n del especto del pulso y estimaci\u00f3n de la frecuencia central a partir de dicho espectro. El primer aspecto es b\u00e1sicamente un problema de an\u00e1lisis espectral donde debe tenerse en cuenta el particular modelo convolutivo del ruido granular. Por ello se proponen y estudian en esta tesis tres alternativas: m\u00e9todo arma (param\u00e9trico), cepstrum real y cepstrum complejo basado en hos ( ambos no para<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>An\u00e1lisis espectral del ruido granular para la extracci\u00f3n de firmas ultras\u00f3nicas.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 An\u00e1lisis espectral del ruido granular para la extracci\u00f3n de firmas ultras\u00f3nicas. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Jorge Gos\u00e1lbez Castillo <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 23\/07\/2004<\/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>Lu\u00eds Vergara Dom\u00ednguez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Mossi Garc\u00eda Jos\u00e9 manuel <\/li>\n<li>nicol\u00e1s Ruiz reyes (vocal)<\/li>\n<li> Cervera moreno Francisco salvador (vocal)<\/li>\n<li>Manuel Rosa zurera (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Jorge Gos\u00e1lbez Castillo El tratamiento digital de se\u00f1ales es hoy en d\u00eda un aspecto fundamental en el [&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 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