GIULIA BELLEZZA

GIUSEPPE D'AMICO

GIUSEPPE PETRONE

MARIA CINEFRA

SERGIO DE ROSA

English

PORTO@iris (Publications Open Repository TOrino - Politecnico di Torino)

04 August 2020POLITECNICO DI TORINORepository ISTITUZIONALEOverview on metamaterials for acoustical applications / Bellezza, Giulia; D'Amico, Giuseppe; Cinefra, Maria; Petrone,Giuseppe; DE ROSA, Sergio. - (2018). ((Intervento presentato al convegno First International Conference on Mechanicsof Advanced Materials and Structures - ICMAMS 2018 tenutosi a Torino nel June 17-20, 2018.OriginalOverview on metamaterials for acoustical applicationsPublisher:PublishedDOI:10.5281/zenodo.1308076Terms of use:openAccessPublisher copyright(Article begins on next page)This article is made available under terms and conditions as specified in the  corresponding bibliographic description inthe repositoryAvailability:This version is available at: 11583/2728878 since: 2019-03-20T11:17:37ZCarrera Erasmo; Reddy JN; Cinefra Maria; Filippi Matteo; Pagani Alfonso; Petrolo Marco; Zappino EnricoICMAMS 2018First International Conference on Mechanics of Advanced Materials and StructuresTurin, 17-20 June 2018www.icmams.comOverview on metamaterials for acoustic applicationsG. Bellezza2,*, G. D’Amico1,*, M. Cinefra1, G. Petrone2, and S. De Rosa21 mul2, Department of Mechanical and Aerospace Engineering, Politecnico di Torino, Italy2 pasta− lab, Department of Industrial Engineering, Universita´ degli Studi di Napoli Federico II, Italy* Corresponding author: maria.cinefra@polito.itThe increasing requirement for bigger, faster and lighter vehicles has increased the de-mand of efficient structural arrangements, making sandwich constructions a well-establishedtechnique in lightweight component design. The weight reduction can be used to increasethe payload, to increase the speed or just to reduce the energy consumption with main-tained loading capability and/or max speed. However, lightweight design typically com-bines reduced weight and increased stiffness, leading to a deterioration of the noise andvibration attenuation performance. Consequently, merging lightweight and vibro-acousticrequirements results in a challenging and often conflicting task, for which novel low massand compact volume solutions are sought.New ideas, coupled with the expanding technologies of computational simulation andadditive manufacturing, will produce the next generation of materials. Metamaterial isjust this: a new concept, a new technology which properties derive not from the natureof the material itself but by from their newly designed structures. Their precise shape,geometry, size, orientation and arrangement gives them their smart properties capableto manipulate waves: by blocking, absorbing, enhancing, or bending waves, to achievebenefits that go beyond what is possible with conventional materials.Metamaterial is a combination of ”meta” and ”material”. Meta is a Greek word whichmeans something beyond, altered, changed. To the letter metamaterial means: materialthat does not exist in nature; in physics material with negative refractive index.Metamaterials found great interest in several applications for manipulating waves.First prototypes were built to manipulate electromagnetic waves at the end of the 19thcentury. Recently, metamaterials have found a great interest in vibro-acoustic field withfavorable noise and vibration attenuation behavior, at least in some targeted and tunablefrequency ranges, referred to as stop bands. Acoustic metamaterials (AMMs) are artifi-cial structures made of subwavelength units such that their acoustic properties are newin comparison with that of the building units. Recent studies show that heterogeneous,poroelastic metamaterials can achieve considerable wave and/or vibration energy absorp-tion. For instance, randomly embedding solid, metal inclusions into poroelastic foamsimproves the low frequency attenuation of the host media. Periodically distributing suchinclusions also spawns bandgap phenomena to substantially increase low frequency vi-broacoustic energy absorption via ”trapped” mode effects.

Overview on metamaterials for acoustical applications

https://iris.polito.it/retrieve/handle/11583/2728878/237780/ICMAMS_Cinefra_metamaterial_modificato.pdf

Overview on metamaterials for acoustical applications

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