| Issue |
E3S Web Conf.
Volume 364, 2023
The 3ʳᵈ Edition of Oriental Days for the Environment “Green Lab. Solution for Sustainable Development” (JOE3)
|
|
|---|---|---|
| Article Number | 03003 | |
| Number of page(s) | 11 | |
| Section | Materials Recycling & Sustainable Development | |
| DOI | https://doi.org/10.1051/e3sconf/202336403003 | |
| Published online | 23 January 2023 | |
Noise reduction through periodic serial side branches containing two defects
1 Laboratory of Materials, Waves, Energy, and Environment, Department of Physics, Faculty of Sciences, Mohammed First University, Oujda 60000, Morocco
2 Centro/Departamento de Fisica, Escola de Ciências, Universidade do Minho, Braga, 4710-057, Portugal
3 Basque Center for Materials, Applications and Nanostructures, UPV/EHU Science Park, Leioa, 48940, Spain
4 IKERBASQUE, Basque Foundation for Science, Bilbao, 48009, Spain
* Corresponding author: m.elmalki@ump.ac.ma
Noise pollution is a challenging issue requiring the development of acoustic systems that can reduce noise. Besides the environmental impacts of noise pollution, it can cause serious health problems. This work originally discusses noise reduction using a new configuration of side branches grafted in series with different terminations. The combination of two serial resonators shows acoustic coupling effects. This effect is used to increase localized modes of two serial defective resonators located in the middle of the structure. The transmission of acoustic waves can be controlled by the dimensions of the introduced defects as well as their boundary conditions. We also show that defects can totally filter the transmission of the pass-bands. The proposed structure can then play the role of an acoustical filter.
Key words: Noise pollution / Side branches / Acoustic coupling effects / Localized modes / Acoustical filter
© The Authors, published by EDP Sciences, 2023
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