{"id":66665,"date":"2018-03-09T22:55:00","date_gmt":"2018-03-09T22:55:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/towards-the-full-control-of-sound-with-sonic-crystals-and-acoustic-metamaterials\/"},"modified":"2018-03-09T22:55:00","modified_gmt":"2018-03-09T22:55:00","slug":"towards-the-full-control-of-sound-with-sonic-crystals-and-acoustic-metamaterials","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ultrasonidos\/towards-the-full-control-of-sound-with-sonic-crystals-and-acoustic-metamaterials\/","title":{"rendered":"Towards the full control of sound with sonic crystals and acoustic metamaterials."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Daniel Torrent Marti <\/strong><\/h2>\n<p>El objetivo de este trabajo ha sido obtener expresiones matem\u00e1ticas para los par\u00e1metros el\u00e1sticos y ac\u00fasticos efectivos de sistemas heterog\u00e9neos en el l\u00edmite de homogeneizaci\u00f3n,  lo que ha permitido el dise\u00f1o de nuevos dispositivos ac\u00fasticos y el\u00e1sticos funcionales en un amplio rango de longitudes de onda. \tlos sistemas heterog\u00e9neos estudiados han sido, principalmente, estructuras de cilindros el\u00e1sticos inmersos en un medio fluido no-viscoso, aunque otras geometr\u00edas han sido comentadas. La periodicidad de estas estructuras permite reducir el problema al estudio de la \u00abcelda unidad\u00bb; es decir, a la regi\u00f3n del espacio que se repite. Sin embargo, el m\u00e9todo desarrollado en el presente trabajo ha permitido analizar el comportamiento cuando la periodicidad se ve alterada por defectos estructurales. \tmatem\u00e1ticamente este problema ha sido tratado mediante la teor\u00eda de dispersi\u00f3n m\u00faltiple, ya que las geometr\u00edas del problema son principalmente circulares y dicha teor\u00eda ha demostrado ser la m\u00e1s adecuada en ese caso. \tse ha utilizado la citada teor\u00eda de dispersi\u00f3n m\u00faltiple para analizar el comportamiento de un s\u00f3lo cilindro y de un conjunto de cilindros. Este conjunto de cilindros ha sido ordenado, por un lado, en filas infinitas, dando lugar a expresiones para la reflectancia y transmitancia. Por otro lado, la extensi\u00f3n a todo el plano de las redes de cilindros ha permitido obtener resultados para la estructura de bandas. \tpara obtener los par\u00e1metros efectivos se han desarrollado dos m\u00e9todos de homogeneizaci\u00f3n que, si bien coinciden en resultados para los casos elementales, han demostrado ser complementarios para calcular situaciones m\u00e1s complejas. El primero se basa en la propagaci\u00f3n de ondas el\u00e1sticas a trav\u00e9s de medios peri\u00f3dicos. Se ha demostrado que, en el l\u00edmite de baja frecuencia, la propagaci\u00f3n de estas ondas presenta una relaci\u00f3n de dispersi\u00f3n lineal, de cuya pendiente se  ha podido obtener la velocidad de propagaci\u00f3n efectiva del medio uniforme asociado. El segundo<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Towards the full control of sound with sonic crystals and acoustic metamaterials.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Towards the full control of sound with sonic crystals and acoustic metamaterials. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Daniel Torrent Marti <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 25\/07\/2008<\/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>dehesa Moreno Sachez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: pedro Tarazona lafarga <\/li>\n<li>Rafael Orive illera (vocal)<\/li>\n<li>Francisco Simon hidalgo (vocal)<\/li>\n<li>gregory j Orris (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Daniel Torrent Marti El objetivo de este trabajo ha sido obtener expresiones matem\u00e1ticas para los par\u00e1metros el\u00e1sticos [&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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