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Open AccessArticle

Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders

1
Structor Akustik AB, Solnavägen 4, 113 65 Stockholm, Sweden
2
School of Electrical Engineering, University of Belgrade, Bulevar K. Aleksandra 73, 11000 Belgrade, Serbia
3
Department of Electronic Engineering, Universitat Politècnica de València, Camino de Vera s/n, ES-46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Materials 2019, 12(17), 2806; https://doi.org/10.3390/ma12172806
Received: 30 June 2019 / Revised: 16 August 2019 / Accepted: 27 August 2019 / Published: 31 August 2019
(This article belongs to the Special Issue Advances in Acoustic Metamaterials)
A sonic crystal barrier, consisting of empty micro-perforated cylindrical shells, was built on the campus at the Universitat Politècnica de València in 2011 and characterised by using a non-standardised measurement technique. In this paper, the sonic crystal barrier, upgraded with rubber crumb inside the micro-perforated cylindrical shells, was characterised by using standardised measurement techniques according to EN 1793-5 and EN 1793-6. As a result of the characterisation, sound insulation properties of the barrier were shown to be a combination of the absorptive properties of the individual building units and the reflective properties of their periodic distribution. In addition, its performance was compared with a similar barrier consisting of rigid polyvinyl chloride (PVC) cylinders, which was recently characterised using the same standardised techniques. In comparison with the barrier based on PVC cylinders, the barrier investigated here produced a broadband enhancement of the sound insulation and lower reflection indices in the targeted frequency range. It was also shown that the influence of leakage under the barrier and the width of the temporal window on sound insulation was negligible. While EN 1793-5 and 1793-6 allow a direct comparison of the performance of different noise barriers, the applicability to this new type of barriers requires further investigation. View Full-Text
Keywords: sonic crystals; noise barriers; sound insulation; sound reflection; EN 1793-5; EN 1793-6 sonic crystals; noise barriers; sound insulation; sound reflection; EN 1793-5; EN 1793-6
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MDPI and ACS Style

Dimitrijević, S.M.; García-Chocano, V.M.; Cervera, F.; Roth, E.; Sánchez-Dehesa, J. Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders. Materials 2019, 12, 2806. https://doi.org/10.3390/ma12172806

AMA Style

Dimitrijević SM, García-Chocano VM, Cervera F, Roth E, Sánchez-Dehesa J. Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders. Materials. 2019; 12(17):2806. https://doi.org/10.3390/ma12172806

Chicago/Turabian Style

Dimitrijević, Stefan M.; García-Chocano, Víctor M.; Cervera, Francisco; Roth, Emelie; Sánchez-Dehesa, José. 2019. "Sound Insulation and Reflection Properties of Sonic Crystal Barrier Based on Micro-Perforated Cylinders" Materials 12, no. 17: 2806. https://doi.org/10.3390/ma12172806

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