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Conference_programme: 13.1 - Noise Barriers / absorbive claddings / diffractive barrier tops

Lecture: Design and technological adaptation of an acoustic screen based on Sonic Crystals to place it in real environments

Author(s): Peiró-Torres María Del Pilar, Castiñeira-Ibáñez Sergio, Bravo Jose María, Ferri Marcelino, Redondo Javier, Vea-Folch Francisco José, Ballester-Ramos Mireia, Sánchez-Pérez Juan Vicente

Sonic Crystals are new heterogeneous materials formed by a crystalline array of scatterers that are embedded in a host material with different physical properties, being one of them a fluid. The great variety of physical properties of these materials in the control of the acoustic waves transmission has given rise to the development of numerous high technological level devices. One of the main properties of Sonic Crystals is the existence of Band gaps, defined as ranges of frequencies whose propagation through the Sonic Crystal is forbidden. This new acoustic wave control mechanism is based on the well-known Bragg interference due to a multiple scattering process. Based on this property, a new generation of technologically advanced noise reducing devices has been developed. One of them are the Sonic Crystal Acoustic Screens (SCAS), a family of advanced acoustic screens with many advantages over the classical screens normally used in environmental acoustics. Several models of SCAS have been proposed by different research groups with excellent noise control capabilities, able to compete acoustically with the classic screens usually formed by continuous walls. However, there is still no SCAS ready to be commercialized and installed. In this work we present a new SCAS designed with a double purpose: (i) to achieve a high level of acoustic protection and (ii) to follow the market guidelines so that SCAS can be competitive with the classical screens in some non-acoustic aspects. To do this, a multidisciplinary team has been formed to design a new device from both acoustic and non-acoustic points of view. The result obtained, commercially called “Cristalofnoise”, is the first SCAS ready to be commercialized and installed.

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Corresponding author

Name: Ms Mª del Pilar Peiró-Torres

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Country: Spain