Woodruff School of Mechanical Engineering

Mechanical Engineering Seminar

Title:

Acoustic Metamaterials and Metasurfaces for Sound Absorption and Energy Harvesting

Speaker:

Dr. Badreddine Assouar

Affiliation:

University of Lorraine, France

When:

Tuesday, September 18, 2018 at 10:00:00 AM

Where:

MRDC Building, Room 4211

Host:

Dr. Alper Erturk
alper.erturk@me.gatech.edu
404-385-1394

Abstract

In this seminar, I present some recent researches on acoustic metamaterials and metasurfaces for sound absorption, and a new approach for acoustic energy harvesting. Regarding the acoustic absorption, I will present some recent works dealing with absorption in very low-frequency regime making use of coiled metasurfaces. I will provide theoretical and experimental approaches and results on perfect absorber metasurface-based, as well as the associated engineering applications. I will discuss the added value the concept of metasurfaces and the coiling-up space geometry is introducing to cope with the challenge of low-frequency absorption with sub-wavelength thin structures. In the second part of this seminar, I will talk about the acoustic energy harvesting making use of metamaterials and metasurfaces. The main idea and objective is to harvest the renewable, clean and abundant acoustic energy produced by environmental low-frequency acoustic noise/sound. I then will describe some new approaches we have introduced to deal with the focusing, confinement and harvesting of acoustic wave (energy) with multi-lateral metasurfaces, as well as with the acousto-electric energy conversion model.


Biography

Badreddine Assouar received his PhD degree in Materials Physics from Nancy University in France in 2001. In 2002, he became a Research Scientist at the “Centre National de la Recherche Scientifique (CNRS)” in France. He obtained his accreditation to supervise research (HDR) in 2007 and became a Principal Research Scientist. In 2010, he joined Georgia Institute of Technology in USA as visiting Professor, where he spent 2 years. Since 2012, he leads the “Acoustic Metamaterials and Phononics” group at the University of Lorraine, where he is developing researches on acoustic/elastic metamaterials, metasurfaces and phononics. He published more than 100 papers in peer-reviewed international journals. B. Assouar is Associate Editor for “JASA”, “Journal of Applied Physics” and “Scientific Reports”. He is also an expert for the European Commission and the National Science Foundation (NSF).