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19 results on '"Sánchez-Dehesa Moreno-Cid, José"'

1. Experimental evidence of a hiding zone in a density-near-zero acoustic metamaterial

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, European Commission, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Romero-García, V., Groby, J.-P., Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, European Commission, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Romero-García, V., and Groby, J.-P.

Abstract

[EN] This paper examines the feasibility of cloaking an obstacle using Plate-type Acoustic Metamaterials (PAMs). We present two distinct strategies to cloak this obstacle, using either the near-zero-density regime of a periodic arrangement of plates or the acoustic doping phenomenon to achieve simultaneous zero-phase propagation and impedance matching. The strong limitations induced by viscothermal and viscoelastic losses that cannot be avoided in such a system are studied. A hiding zone is reported analytically, numerically, and experimentally. In contrast to cloaking, where zero-phase propagation must be accompanied by total transmission and zero reflection, the hiding configuration requires that the scattering properties of the hiding device must not be affected by the presence of the obstacle embedded in it. Contrary to cloaking, the hiding phenomenon is achievable even with a realistic PAM possessing unavoidable losses.

Published
2021

2. Experimental evidence of a hiding zone in a density-near-zero acoustic metamaterial

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, European Commission, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Romero-García, V., Groby, J.-P., Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, European Commission, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Romero-García, V., and Groby, J.-P.

Abstract

[EN] This paper examines the feasibility of cloaking an obstacle using Plate-type Acoustic Metamaterials (PAMs). We present two distinct strategies to cloak this obstacle, using either the near-zero-density regime of a periodic arrangement of plates or the acoustic doping phenomenon to achieve simultaneous zero-phase propagation and impedance matching. The strong limitations induced by viscothermal and viscoelastic losses that cannot be avoided in such a system are studied. A hiding zone is reported analytically, numerically, and experimentally. In contrast to cloaking, where zero-phase propagation must be accompanied by total transmission and zero reflection, the hiding configuration requires that the scattering properties of the hiding device must not be affected by the presence of the obstacle embedded in it. Contrary to cloaking, the hiding phenomenon is achievable even with a realistic PAM possessing unavoidable losses.

Published
2021

3. Zero-phase propagation in realistic plate-type acoustic metamaterials

Author

Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Ministerio de Economía y Empresa, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Groby, Jean-Philippe, Romero García, Vicente, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Ministerio de Economía y Empresa, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Groby, Jean-Philippe, and Romero García, Vicente

Abstract

[EN] We theoretically, numerically, and experimentally analyze the Density-Near-Zero (DNZ) regime of a one-dimensional acoustic metamaterial. This acoustic metamaterial is composed of thin elastic plates periodically clamped in an air-filled waveguide, and the effective dynamic zero mass density is obtained from the strong dispersion around the bandgaps associated with the resonances of the plates. We emphasize the importance of the impedance mismatch between the acoustic metamaterial and the surrounding waveguide at the frequency of the zero effective density in addition to the consequences of the inherent losses. As a result, the frequency of the zero phase propagation, i.e., the acoustic propagation with zero phase delay, is not exactly the frequency of the zero density and lies in the frequency bandgap where the effective density is negative. Considering these limitations, the zero phase propagation is still experimentally observed and a subwavelength acoustic dipole is numerically designed, thus demonstrating the possible realistic implementations of DNZ acoustic metamaterials.

Published
2019

4. Aerogel-based metasurfaces for perfect acoustic energy absorption

Author

Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Generalitat Valenciana, Region Pays de la Loire, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Fernandez-Marin, Antonio A., Jimenez, Noe, Groby, Jean-Philippe, Sánchez-Dehesa Moreno-Cid, José, Romero García, Vicente, Universitat Politècnica de València. Instituto de Instrumentación para Imagen Molecular - Institut d'Instrumentació per a Imatge Molecular, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Generalitat Valenciana, Region Pays de la Loire, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Fernandez-Marin, Antonio A., Jimenez, Noe, Groby, Jean-Philippe, Sánchez-Dehesa Moreno-Cid, José, and Romero García, Vicente

Abstract

[EN] The unusual viscoelastic properties of silica aerogel plates are efficiently used to design subwavelength perfect sound absorbers. We theoretically, numerically and experimentally report a perfect absorbing metamaterial panel made of periodically arranged resonant building blocks consisting of a slit loaded by a clamped aerogel plate backed by a closed cavity. The impedance matching condition is analyzed using the Argand diagram of the reflection coefficient, i.e., the trajectory of the reflection coefficient as a function of frequency in the complex plane. The lack or excess of losses in the system can be identified via this Argrand diagram in order to achieve the impedance matching condition. The universality of this tool can be further exploited to design more complex metasurfaces for perfect sound absorption, thus allowing the rapid design of novel and efficient absorbing metamaterials.

Published
2019

5. Zero-phase propagation in realistic plate-type acoustic metamaterials

Author

Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Ministerio de Economía y Empresa, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Groby, Jean-Philippe, Romero García, Vicente, Universitat Politècnica de València. Instituto Universitario de Matemática Pura y Aplicada - Institut Universitari de Matemàtica Pura i Aplicada, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Ministerio de Economía y Empresa, Ministerio de Economía y Competitividad, Agence Nationale de la Recherche, Francia, European Cooperation in Science and Technology, Malléjac, M., Merkel, A., Sánchez-Dehesa Moreno-Cid, José, Christensen, J., Tournat, V., Groby, Jean-Philippe, and Romero García, Vicente

Abstract

[EN] We theoretically, numerically, and experimentally analyze the Density-Near-Zero (DNZ) regime of a one-dimensional acoustic metamaterial. This acoustic metamaterial is composed of thin elastic plates periodically clamped in an air-filled waveguide, and the effective dynamic zero mass density is obtained from the strong dispersion around the bandgaps associated with the resonances of the plates. We emphasize the importance of the impedance mismatch between the acoustic metamaterial and the surrounding waveguide at the frequency of the zero effective density in addition to the consequences of the inherent losses. As a result, the frequency of the zero phase propagation, i.e., the acoustic propagation with zero phase delay, is not exactly the frequency of the zero density and lies in the frequency bandgap where the effective density is negative. Considering these limitations, the zero phase propagation is still experimentally observed and a subwavelength acoustic dipole is numerically designed, thus demonstrating the possible realistic implementations of DNZ acoustic metamaterials.

Published
2019

6. Theoretical study of platonic crystals with periodically structured N-beam resonators

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions, China Scholarship Council, Ministerio de Economía y Empresa, European Regional Development Fund, National Natural Science Foundation of China, Gao, Penglin, Climente Alarcón, Alfonso, Sánchez-Dehesa Moreno-Cid, José, Wu, Linzhi, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions, China Scholarship Council, Ministerio de Economía y Empresa, European Regional Development Fund, National Natural Science Foundation of China, Gao, Penglin, Climente Alarcón, Alfonso, Sánchez-Dehesa Moreno-Cid, José, and Wu, Linzhi

Abstract

[EN] A multiple scattering theory is applied to study the properties of flexural waves propagating in a plate with periodically structured N-beam resonators. Each resonator consists of a circular hole containing an inner disk connected to background plate with N rectangular beams. The Bloch theorem is employed to obtain the band structure of a two-dimensional lattice containing a single resonator per unit cell. Also, a numerical algorithm has been developed to get the transmittance through resonator slabs infinitely long in the direction perpendicular to the incident wave. For the numerical validation, a square lattice of 2-beam resonators has been comprehensively analyzed. Its band structure exhibits several flat bands, indicating the existence of local resonances embedded in the structure. Particularly, the one featured as the fundamental mode of the inner disk opens a bandgap at low frequencies. This mode has been fully described in terms of a simple spring-mass model. As a practical application of the results obtained, a homogenization approach has been employed to design a focusing lens for flexural waves, where the index gradient is obtained by adjusting the orientation of the resonators beams. Numerical experiments performed within the framework of a three-dimensional finite element method have been employed to discuss the accuracy of the models described here. Published by AIP Publishing.

Published
2018

7. Theoretical study of platonic crystals with periodically structured N-beam resonators

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions, China Scholarship Council, National Natural Science Foundation of China, Ministerio de Economía y Competitividad, Gao, Penglin, Climente Alarcón, Alfonso, Sánchez-Dehesa Moreno-Cid, José, Wu, Linzhi, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions, China Scholarship Council, National Natural Science Foundation of China, Ministerio de Economía y Competitividad, Gao, Penglin, Climente Alarcón, Alfonso, Sánchez-Dehesa Moreno-Cid, José, and Wu, Linzhi

Abstract

[EN] A multiple scattering theory is applied to study the properties of flexural waves propagating in a plate with periodically structured N-beam resonators. Each resonator consists of a circular hole containing an inner disk connected to background plate with N rectangular beams. The Bloch theorem is employed to obtain the band structure of a two-dimensional lattice containing a single resonator per unit cell. Also, a numerical algorithm has been developed to get the transmittance through resonator slabs infinitely long in the direction perpendicular to the incident wave. For the numerical validation, a square lattice of 2-beam resonators has been comprehensively analyzed. Its band structure exhibits several flat bands, indicating the existence of local resonances embedded in the structure. Particularly, the one featured as the fundamental mode of the inner disk opens a bandgap at low frequencies. This mode has been fully described in terms of a simple spring-mass model. As a practical application of the results obtained, a homogenization approach has been employed to design a focusing lens for flexural waves, where the index gradient is obtained by adjusting the orientation of the resonators beams. Numerical experiments performed within the framework of a three-dimensional finite element method have been employed to discuss the accuracy of the models described here. Published by AIP Publishing.

Published
2018

8. Gradient index lenses for flexural waves based on thickness variations

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Copyright (2014) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message: The following article appeared in Applied Physics Letters 105, (6) and may be found at http://dx.doi.org/10.1063/1.4893153. Authors own version of final article on e-print servers, This work presents a method for the realization of gradient index devices for flexural waves in thin plates. Unlike recent approaches based on phononic crystals, the present approach is based on the thickness-dependence of the dispersion relation of flexural waves, which is used to create gradient index devices by means of local variations of the plate's thickness. Numerical simulations of known circularly symmetrical gradient index lenses have been performed. These simulations have been done using the multilayer multiple scattering method and the results prove their broadband efficiency and omnidirectional properties. Finally, finite element simulations employing the full three-dimensional elasticity equations also support the validity of the designed approach. (c) 2014 AIP Publishing LLC.

Published
2014

9. Enhanced inertia from lossy effective fluids using multi-scale sonic crystals

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Office of Naval Research, Guild, Matthew, García Chocano, Víctor Manuel, Kan, Weiwei, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Office of Naval Research, Guild, Matthew, García Chocano, Víctor Manuel, Kan, Weiwei, and Sánchez-Dehesa Moreno-Cid, José

Abstract

n this work, a recent theoretically predicted phenomenon of enhanced permittivity with electromagnetic waves using lossy materials is investigated for the analogous case of mass density and acoustic waves, which represents inertial enhancement. Starting from fundamental relationships for the homogenized quasi-static effective density of a fluid host with fluid inclusions, theoretical expressions are developed for the conditions on the real and imaginary parts of the constitutive fluids to have inertial enhancement, which are verified with numerical simulations. Realizable structures are designed to demonstrate this phenomenon using multi-scale sonic crystals, which are fabricated using a 3D printer and tested in an acoustic impedance tube, yielding good agreement with the theoretical predictions and demonstrating enhanced inertia.

Published
2014

10. Gradient index lenses for flexural waves based on thickness variations

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Copyright (2014) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message: The following article appeared in Applied Physics Letters 105, (6) and may be found at http://dx.doi.org/10.1063/1.4893153. Authors own version of final article on e-print servers, This work presents a method for the realization of gradient index devices for flexural waves in thin plates. Unlike recent approaches based on phononic crystals, the present approach is based on the thickness-dependence of the dispersion relation of flexural waves, which is used to create gradient index devices by means of local variations of the plate's thickness. Numerical simulations of known circularly symmetrical gradient index lenses have been performed. These simulations have been done using the multilayer multiple scattering method and the results prove their broadband efficiency and omnidirectional properties. Finally, finite element simulations employing the full three-dimensional elasticity equations also support the validity of the designed approach. (c) 2014 AIP Publishing LLC.

Published
2014

11. Omnidirectional broadband acoustic absorber based on metamaterials

Author

Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Universitat Politècnica de València, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Universitat Politècnica de València, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that bends the sound towards the center and a core that dissipates its energy. The shell is made of a metamaterial that perfectly matches the acoustic impedance of air and behaves like a gradient index lens. The experimental data obtained in a multi-modal impedance chamber demonstrate that the proposed acoustic black-hole acts like an onmidirectional broadband absorber with strong absorbing efficiency. © 2012 American Institute of Physics.

Published
2012

12. Omnidirectional broadband acoustic absorber based on metamaterials

Author

Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Universitat Politècnica de València, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Universitat Politècnica de València, Office of Naval Research, Climente Alarcón, Alfonso, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

We present the design, construction, and experimental characterization of the acoustic analogue of the so called photonic black-hole. The fabricated sample has cylindrical symmetry and consists of two parts, a shell that bends the sound towards the center and a core that dissipates its energy. The shell is made of a metamaterial that perfectly matches the acoustic impedance of air and behaves like a gradient index lens. The experimental data obtained in a multi-modal impedance chamber demonstrate that the proposed acoustic black-hole acts like an onmidirectional broadband absorber with strong absorbing efficiency. © 2012 American Institute of Physics.

Published
2012

13. Reduced acoustic cloaks based on temperature gradients

Author

Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Ministerio de Ciencia e Innovación, Office of Naval Research, García Chocano, Víctor Manuel, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Ministerio de Ciencia e Innovación, Office of Naval Research, García Chocano, Víctor Manuel, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

This letter presents the design of a reduced acoustic cloak that uses a temperature gradient in order to obtain sound speeds larger than in air. The cloak consists of a circular acoustic crystal made of ten concentric layers of rigid cylinders whose surfaces are heated or cooled in order to get the temperature gradient needed for cloaking behavior. The total pressure field produced by the scattering of sound waves impinging this complex structure is computed and it is shown how acoustic waves are bent in a way similar to that predicted for perfect cloaking devices. © 2012 American Institute of Physics.

Published
2012

14. Broadband sound absorption by lattices of microperforated cylindrical shells

Author

Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Office of Naval Research, García Chocano, Víctor Manuel, Cabrera García, Suitberto, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Office of Naval Research, García Chocano, Víctor Manuel, Cabrera García, Suitberto, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Absorption of broadband noise by sonic crystals consisting of microperforated cylindrical shells is proposed and experimentally demonstrated. The theoretical study has been performed in the framework of multiple scattering method, where a model for the T matrix of the microperforated shells has been developed. It has been predicted an extraordinary broadband sound absorption that is explained in terms of the multiple scattering phenomena occurring at the surfaces of the absorptive units-the microperforated panels. Our proposal has been supported by experiments performed on a structure consisting of 3 rows of cylindrical shells 3 meters height. © 2012 American Institute of Physics.

Published
2012

15. Broadband sound absorption by lattices of microperforated cylindrical shells

Author

Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Office of Naval Research, García Chocano, Víctor Manuel, Cabrera García, Suitberto, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Office of Naval Research, García Chocano, Víctor Manuel, Cabrera García, Suitberto, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Absorption of broadband noise by sonic crystals consisting of microperforated cylindrical shells is proposed and experimentally demonstrated. The theoretical study has been performed in the framework of multiple scattering method, where a model for the T matrix of the microperforated shells has been developed. It has been predicted an extraordinary broadband sound absorption that is explained in terms of the multiple scattering phenomena occurring at the surfaces of the absorptive units-the microperforated panels. Our proposal has been supported by experiments performed on a structure consisting of 3 rows of cylindrical shells 3 meters height. © 2012 American Institute of Physics.

Published
2012

16. Experimental realization of broadband tunable resonators based on anisotropic metafluids

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Universitat Politècnica de València, Spiousas, Ignacio, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Universitat Politècnica de València, Spiousas, Ignacio, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message: The following article appeared in Applied Physics Letters. 98(24) and may be found at http://dx.doi.org/10.1063/1.3599849. Authors own version of final article on e-print servers, This letter demonstrates the mechanical tuning of modes confined in two-dimensional acoustic cavities based on anisotropic metafluids. The employed metafluids have been designed with effective parameters such that the radial component of the sound speed tensor keeps constant and the acoustic impedance remains finite along the tuning. It is shown that mode frequencies can be mechanically down shifted to extremely low values. Experiments confirm the model predictions and let us to conclude that this type of resonators can be employed for the miniaturization of standard resonators based on isotropic fluids such as air. © 2011 American Institute of Physics.

Published
2011

17. Acoustic cloack for airborne sound by inverse design

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Consejo Superior de Investigaciones Científicas, Office of Naval Research, García Chocano, Víctor Manuel, Sanchis, Lorenzo, Díaz Rubio, Ana, Martínez Pastor, Juan P., Cervera Moreno, Francisco Salvador, Llopis Pontiveros, Rafael, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Consejo Superior de Investigaciones Científicas, Office of Naval Research, García Chocano, Víctor Manuel, Sanchis, Lorenzo, Díaz Rubio, Ana, Martínez Pastor, Juan P., Cervera Moreno, Francisco Salvador, Llopis Pontiveros, Rafael, and Sánchez-Dehesa Moreno-Cid, José

Abstract

[EN] This Letter presents practical realization of a two-dimensional low loss acoustic cloak for airborne sound obtained by inverse design. The cloak consists of 120 aluminum cylinders of 15 mm diameter surrounding the cloaked object¿a cylinder of diameter 22.5 cm. The position of each cylinder in the cloak is optimized using the data from two different techniques: genetic algorithm and simulated annealing. The operation frequency of this cloak is 3061 Hz with the bandwidth of about 100 Hz. Being a multi-step approach to the desired cloaking, the inverse design is also valid, in principle, for non-symmetric cylinders and even for three-dimensional objects. VC 2011 American Institute of Physics

Published
2011

18. Experimental realization of broadband tunable resonators based on anisotropic metafluids

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Universitat Politècnica de València, Spiousas, Ignacio, Torrent Martí, Daniel, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Estadística e Investigación Operativa Aplicadas y Calidad - Departament d'Estadística i Investigació Operativa Aplicades i Qualitat, Office of Naval Research, Universitat Politècnica de València, Spiousas, Ignacio, Torrent Martí, Daniel, and Sánchez-Dehesa Moreno-Cid, José

Abstract

Copyright (2011) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics along with the following message: The following article appeared in Applied Physics Letters. 98(24) and may be found at http://dx.doi.org/10.1063/1.3599849. Authors own version of final article on e-print servers, This letter demonstrates the mechanical tuning of modes confined in two-dimensional acoustic cavities based on anisotropic metafluids. The employed metafluids have been designed with effective parameters such that the radial component of the sound speed tensor keeps constant and the acoustic impedance remains finite along the tuning. It is shown that mode frequencies can be mechanically down shifted to extremely low values. Experiments confirm the model predictions and let us to conclude that this type of resonators can be employed for the miniaturization of standard resonators based on isotropic fluids such as air. © 2011 American Institute of Physics.

Published
2011

19. Acoustic cloack for airborne sound by inverse design

Author

Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Consejo Superior de Investigaciones Científicas, Office of Naval Research, García Chocano, Víctor Manuel, Sanchis, Lorenzo, Díaz Rubio, Ana, Martínez Pastor, Juan P., Cervera Moreno, Francisco Salvador, Llopis Pontiveros, Rafael, Sánchez-Dehesa Moreno-Cid, José, Universitat Politècnica de València. Departamento de Ingeniería Electrónica - Departament d'Enginyeria Electrònica, Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada, Universitat Politècnica de València. Grupo de Fenómenos Ondulatorios (GFO), Consejo Superior de Investigaciones Científicas, Office of Naval Research, García Chocano, Víctor Manuel, Sanchis, Lorenzo, Díaz Rubio, Ana, Martínez Pastor, Juan P., Cervera Moreno, Francisco Salvador, Llopis Pontiveros, Rafael, and Sánchez-Dehesa Moreno-Cid, José

Abstract

[EN] This Letter presents practical realization of a two-dimensional low loss acoustic cloak for airborne sound obtained by inverse design. The cloak consists of 120 aluminum cylinders of 15 mm diameter surrounding the cloaked object¿a cylinder of diameter 22.5 cm. The position of each cylinder in the cloak is optimized using the data from two different techniques: genetic algorithm and simulated annealing. The operation frequency of this cloak is 3061 Hz with the bandwidth of about 100 Hz. Being a multi-step approach to the desired cloaking, the inverse design is also valid, in principle, for non-symmetric cylinders and even for three-dimensional objects. VC 2011 American Institute of Physics

Published
2011

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