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Acoustic Materials and Metamaterials

Acoustic Materials and Metamaterials. Instructor: Prof. Sneha Singh, Department of Mechanical Engineering, IIT Roorkee. The study of electromagnetic and acoustic waves is an endeavor that dates back centuries. An important subdomain of this field that affects our daily life is the use of acoustic principles to control environmental noise. In this regard, acoustic materials, which are materials designed to manipulate sound wave propagation, are of prime importance. Within this field, about three decades ago, the concept of metamaterials was proposed that has created a revolution. Theoretical formulation and experiments have shown the feasibility of realizing man-made acoustic metamaterials that can manipulate waves beyond the defined limits of those found in nature. Therefore, within a time span of 15 years, acoustic materials have emerged as an active field driven by scientific discoveries and diverse application potentials in machinery noise control, frequency filtering, speech transmission technology, acoustic imaging, and cloaking. This is the first-ever organized coursework on acoustic materials with a special focus on acoustic metamaterials. This course will cover the following topics: 1) Acoustic fundamentals. 2) Theory and design principles of acoustic barrier materials, sound absorbing materials. 3) Limitations of conventional materials. 4) Principles of acoustic metamaterials. 5) Theory and design principles of membrane type metamaterials, of sonic crystals. 6) Guidelines for selecting acoustic materials. (from nptel.ac.in)

Lecture 27 - Applications of Acoustic Metamaterials


Go to the Course Home or watch other lectures:

Lecture 01 - Introduction
Lecture 02 - Sound Wave Propagation in Fluid I
Lecture 03 - Sound Wave Propagation in Fluid II
Lecture 04 - Sound Wave Propagation in Fluid III
Lecture 05 - Sound Propagation at Medium Boundaries
Lecture 06 - Sound Propagation at Medium Boundaries (cont.)
Lecture 07 - Standing Waves and Modes
Lecture 08 - Sound Signal Analysis
Lecture 09 - Sound Signal Analysis (cont.)
Lecture 10 - Principles of Noise Control
Lecture 11 - Acoustic Materials
Lecture 12 - Enclosures
Lecture 13 - Barriers
Lecture 14 - Enclosures and Barriers - Tutorial
Lecture 15 - Sound Absorbing Materials
Lecture 16 - Porous-Fibrous Sound Absorbers
Lecture 17 - Panel Sound Absorbers
Lecture 18 - Helmholtz Resonators
Lecture 19 - Tutorial on Sound Absorbers
Lecture 20 - Perforated Panel Absorbers
Lecture 21 - Microperforated Panel Absorbers 1
Lecture 22 - Microperforated Panel Absorbers 2
Lecture 23 - Microperforated Panel Absorbers 3
Lecture 24 - Introduction to Acoustic Metamaterials
Lecture 25 - Introduction to Acoustic Metamaterials (cont.)
Lecture 26 - History of Acoustic Metamaterials
Lecture 27 - Applications of Acoustic Metamaterials
Lecture 28 - Membrane Type Acoustic Metamaterials 1
Lecture 29 - Membrane Type Acoustic Metamaterials 2
Lecture 30 - Membrane Type Acoustic Metamaterials 3
Lecture 31 - Membrane Type Acoustic Metamaterials 4
Lecture 32 - Advantages and Applications of Membrane Type AMM
Lecture 33 - Tutorial on Membrane Type AMM
Lecture 34 - Introduction to Sonic Crystals
Lecture 35 - Fundamentals of Crystals
Lecture 36 - Principle of Working of Sonic Crystals
Lecture 37 - Principle of Working of Sonic Crystals (cont.)
Lecture 38 - Tutorial on Sonic Crystals
Lecture 39 - More on Sonic Crystals and Conclusions