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

Lecture: Sonic Crystals acoustic screens with diffusion properties

Author(s): Peiró-Torres María Del Pilar, Parrilla-Navarro Manuel, Bravo José María, Ferri Marcelino, Sánchez-Pérez Juan Vicente, Redondo Javier

Sonic Crystals are defined as heterogeneous materials formed by arrays of scatterers embedded in a host material with different physical properties. Their particular properties in the control of acoustic waves have leaded the development of different Noise Reducing Devices technologically advanced, as Sonic Crystals Acoustics Screens (SCAS) to control environmental noise Sonic or Crystals Acoustic Diffusers (SCAD) to spread sound in room acoustics. In this paper we present the design process of a family of new devices developed with the help of both optimization algorithms and Finite Difference Time Domain simulations, which are able to act as acoustic barriers but with high levels of noise diffusion in the face orientated to the noise source. These new devices partially avoid the specular reflected noise produced in classical acoustic barriers, because this is an important factor that reduces their effectiveness. The diffusion capabilities of these new devices support the existence of a new generation of acoustic barriers with added characteristics of high technological value.

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Corresponding author

Name: Prof Juan Vicente Sánchez-Pérez

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Country: Spain