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Refractive devices for acoustical and flexural waves

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Refractive devices for acoustical and flexural waves

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dc.contributor.advisor Sánchez-Dehesa Moreno-Cid, José es_ES
dc.contributor.advisor Torrent Martí, Daniel es_ES
dc.contributor.author Climente Alarcón, Alfonso es_ES
dc.date.accessioned 2015-03-31T06:10:13Z
dc.date.available 2015-03-31T06:10:13Z
dc.date.created 2015-02-20 es_ES
dc.date.issued 2015-03-31 es_ES
dc.identifier.isbn 978-84-9048-326-8
dc.identifier.uri http://hdl.handle.net/10251/48536
dc.description.abstract The aim of this work has been the design and demonstration of refractive devices, not only for acoustic waves, but also for flexural waves in thin plates. Mathematically these problems have been treated by means of the multiple scattering theory, because the geometries of the problems were mainly circular and such theory is the best one in these cases. The multiple scattering theory, previously stated, is here explained. Additionally, a multilayer scattering theory for flexural waves is here introduced and successfully used to numerically simulate their behavior. Therefore, this PhD thesis is divided in two parts. The first part is devoted to describe two acoustic refractive devices: a gradient index lens and an omnidirectional broadband acoustic absorber, or “acoustic black hole”. Both are based on sonic crystals consisting of of rigid cylinders immersed in a fluid background. As the homogenization method states, the desired refractive index can be obtained by tailoring the radii of the cylinders. Thereafter, numerical simulations and measurements were conducted to test the behavior of each device. For this purpose, two specific measuring systems were developed: the two-dimensional chamber and the impedance chamber. Both are here explained in detail. The second part describes the design of refractive devices for flexural waves. Instead of using “platonic crystals”, we made use of the peculiar dispersion relationship of flexural waves. As the equation states, the wave speed is modified not only by the elastic properties of the plate, but also from its thickness. Using the latest approach a set of numerical simulations of known circularly symmetrical gradient index lenses have been performed. Additionally, an omnidirectional broadband insulating device for flexural waves has been designed. It consist of a well-like thickness profile in an annular region of the plate, that mimics the combination of an attractive and repulsive potentials. The waves are focused at its bottom and dissipated by means of an absorptive layer placed on top. Numerical simulations are here presented and discussed. Finally, we present an in-plane flexural resonator, consisting of a hole in a thin plate traversed by a beam. Here, a closed form of the transfer matrix is obtained by coupling the Kirchhoff-Love and the Euler-Bernoulli motion equations. Numerical simulations, tested against a commercial finite element simulator, prove its efficiency en_EN
dc.language Inglés es_ES
dc.publisher Editorial Universitat Politècnica de València
dc.rights Reserva de todos los derechos es_ES
dc.subject 53 - Física es_ES
dc.subject 531 - Mecánica general. Mecánica de los cuerpos sólidos y rígidos es_ES
dc.subject 534 - Acústica es_ES
dc.subject 621 - Ingeniería Mecánica. Técnica en general es_ES
dc.subject.classification ESTADISTICA E INVESTIGACION OPERATIVA es_ES
dc.subject.classification TECNOLOGIA ELECTRONICA es_ES
dc.title Refractive devices for acoustical and flexural waves es_ES
dc.type Tesis doctoral es_ES
dc.identifier.doi 10.4995/Thesis/10251/48536 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica es_ES
dc.description.bibliographicCitation Climente Alarcón, A. (2015). Refractive devices for acoustical and flexural waves [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/48536 es_ES
dc.description.accrualMethod TESIS es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.relation.pasarela TESIS\8142 es_ES


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