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Acoustic Materials and Metamaterials

By Prof. Sneha Singh   |   IIT Roorkee
Learners enrolled: 204

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.
Summary
Course Status : Upcoming
Course Type : Elective
Duration : 8 weeks
Start Date : 24 Jan 2022
End Date : 18 Mar 2022
Exam Date : 27 Mar 2022 IST
Category :
  • Mechanical Engineering
  • Advanced Dynamics and Vibration
Credit Points : 2
Level : Postgraduate



Course layout

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

Books and references

• David A. Bies, and Colin H. Hansen (2009), “Engineering Noise Control: Theory and practice”, Spon Press. 
• M. J. Crocker (2007), “Introduction to Principles of Noise and Vibration Control”, in Handbook of Noise and Vibration Control, John Wiley and Sons Inc.

Instructor bio

Prof. Sneha Singh

IIT Roorkee
Hello, I am Dr. Sneha Singh, an Assistant Professor at MIED, IIT Roorkee. I have obtained my Ph.D. with highest honours from the University of Warwick in 2016 in the area of Automotive Sound Quality. I have obtained by B.Tech. (Honours) from IIT Kharagpur in Manufacturing Science and Engineering in 2011. I am an author of 6 international journal papers of high repute and 8 international conference papers. I thoroughly enjoy teaching and therefore I have gained good teaching experiences during my PhD, my post Doc at IIT Kharagpur & IIT Bombay, and as Assistant Professor at IIT Roorkee. I have taught courses on Automotive Engineering, Acoustics and Noise Control, Kinematics and Dynamics of machines, Theory of Machines and Machine Design, Theory of Production Processes, and Design for Safety & Comfort. Further I have been a guest lecturer at lecture series on Acoustics & Industrial Noise Control at GIAN-IIT Kharagpur. My video lectures are available online at https://www.youtube.com/watch?v=iqVYIq96tB4 Currently, I am pursuing research on Acoustic Metamaterials and I would love to deliver a state-of-the-art lectures on this topic.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 27 March 2022 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.

CRITERIA TO GET A CERTIFICATE

Average assignment score = 25% of average of best 6 assignments out of the total 8 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Roorkee.It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team


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