Theoretical Evidence For Ultrasonic Insulation Using a Fractal-Like Phononic Crystal Membranes

Abdelfattah Elmadani, Abdelmajid Idrissi, Ramdan Braik, Saad Bensallam, Abella Bouaaddi, Younes Achaoui and Hicham Jakjoud
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Abdelfattah Elmadani: Ibn Zohr University, Morocco
Abdelmajid Idrissi: Moulay Ismail University, Morocco
Ramdan Braik: Ibn Zohr University, Morocco
Saad Bensallam: Hassania School of Public Works, Morocco
Abella Bouaaddi: Ibn Zohr University, Morocco
Younes Achaoui: Moulay Ismail University, Morocco
Hicham Jakjoud: Ibn Zohr University, Morocco

European Journal of Applied Physics, 2022, vol. 4, issue 4, 1-5

Abstract: Phononic crystals are artificial engineered materials designed to control and manipulate waves. Unusual behaviour of prohibiting the acoustic propagation in some frequency bands (Band GAP), is a practical way to produce sound-ultrasound-proof environments with a small spatial footprint. In this work, we present a new fractal-like phononic crystal for extraordinary ultrasonic insulation. The host material is a silicon plate where the unit cell is formed by triangular slice and immersed in water. Our simulation is made between 300 kHz and 1.2 MHz and show the possibility of obtaining a wideband-gap, inferior to the one described by the mass law related to a homogeneous silicon membrane, with an attenuation reaching -70 dB, depending on the filling factor.

Keywords: Acoustic metamaterials; band-gap; Fractal structure; Phononic crystals; Sierpiński triangle; Ultrasonic insulation (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:epw:physic:v:4:y:2022:i:4:id:11182

DOI: 10.24018/ejphysics.2022.4.4.182

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