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Indian Institute of Technology Roorkee

Acoustic Materials and Metamaterials

Indian Institute of Technology Roorkee and NPTEL via Swayam


The study of electromagnetic and acoustic waves is an endeavor that dates back centuries. An important sub-domain of this field that effects 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:

  • Acoustic fundamentals
  • Theory and design principles of acoustic barrier materials
  • Theory and design principles of sound absorbing materials
  • Limitations of conventional materials
  • Principles of acoustic metamaterials
  • Theory and design principles of membrane type metamaterials
  • Theory and design principles of sonic crystals
  • Guidelines for selecting acoustic materials

INTENDED AUDIENCE : Students and researchers in "Mechanical Engineering, Materials Engineering, Acoustics, Architecture"
PREREQUISITES : Mathematics (up to Class 12th), Physics (up to Class 12th)INDUSTRY SUPPORT : ARCI, TATA Advanced Materials Limited, Huntsman Corporation, IACS, Materials Research Society of India (MRSI), Acoustic consultants, Advanced materials manufacturers, Speech transmission industry.



Week 1 :Acoustics fundamentals Sound propagation in fluidsWeek 2 :Advanced concepts in acoustics Sound signal analysis Principles of Noise controlWeek 3 :Acoustic materials Enclosures Barriers AbsorbersWeek 4 :Porous sound absorbers Panel absorbers Helmholtz resonators Perforated panel absorbers
Week 5 :Micro-perforated panel absorbers Limitations of conventional acoustic materials Acoustic metamaterialsWeek 6 :Acoustic metamaterials Membrane type acoustic metamaterialsWeek 7 :Membrane type acoustic metamaterials Introduction to Sonic crystalsWeek 8 :Sonic crystals Guidelines for material selection

Taught by

Prof. Sneha Singh


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