Broadband reduction of the specular reflections by using sonic crystals: a proof of concept for noise mitigation in aerospace applications

Lluis Garcia-Raffi, Luis Salmeron-Contreras, I Herrero-Dura, Ruben Pico, J Redondo, Victor Sánchez-Morcillo, Kestutis Staliunas, Nicholas Adkins, Alejandro Cebrecos, Noe Jiménez, Vicent Romero Garcia

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11 Citations (Scopus)
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Abstract

The broadband reduction of the specular reflections by sonic crystals (SCs) is theoretically and experimentally reported in this work. The analysed system consists of a sound source radiating a SC made of acoustically rigid scatterers embedded in water partially covering an open cavity. By comparison with a reference at reflector, we observe that reflected waves spread in space as a consequence of the spatially modulated properties of the SC. Moreover, due to the different working frequency ranges of the SC a significant noise reduction is produced in a broadband region. Therefore,due to the spreading of the reflected waves, the system produces a broadband noise reduction in the area of the source. In particular, the noise reduction is close to 2 dB for the two octaves emitted by our source, which represents a decrease of 37% of the acoustic energy. The results shown in this work constitute a proof of concept for the use of SCs as broadband-noise reduction systems at the launch pad. An approach to the geometry of the Vega launch vehicle the European Space Agency is proposed and the limitations of the study are discussed.
Original languageEnglish
Pages (from-to)300-308
JournalAerospace Science and Technology
Volume73
Early online date8 Dec 2017
DOIs
Publication statusPublished - 1 Feb 2018

Keywords

  • sonic crystals
  • noise reduction
  • diffusion
  • indertion loss
  • reflection

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