Noise Control in Mechanical Systems

By Prof. Sneha Singh | IIT Roorkee

Learners enrolled: 303 | Exam registration: 4

ABOUT THE COURSE:

Sound is an important form of energy that is encountered by human beings every moment of their lives. It is the human perception and response that makes this sound as “Noise”. With increasing modernization, urbanization and industrialization, the concerns of Noise pollution have increased; hence the knowledge of noise control has become tremendously important. Mechanical systems, although make our life easier, are a major source of noise. Therefore, latest research and technology development is towards Quiet Machine Design. This course will impart fundamental knowledge on the subject of Noise Control in Mechanical Systems. Various stages in noise control namely, the acoustic fundamentals, measurement and analysis of sound signals, instrumentation, standards and guidelines for noise measurement of various machineries, principles and strategies for noise control, passive noise control materials, noise sources in mechanical systems, mechanism of noise and vibration generation in machineries, and case studies of noise control of various machineries, will be described. This course will be very useful for undergraduate and postgraduate students of Mechanical Engineering and Civil Engineering, who want to specialize in Machine Design, Structural Design, Dynamics and Vibrations, and Environmental Sciences. The course also holds relevance to various acoustics-based industries, manufacturing and mining industries, industrial power plants, automotive industries, and aerospace industries.

INTENDED AUDIENCE: Intended audience for my course: B.Tech./ B.E., M.Tech. / M.E., PhD students of Mechanical Engineering, Civil Engineering. Professionals inrelevant field.

PREREQUISITES: Class XII Physics, Class XII Mathematics.

INDUSTRY SUPPORT:

EnvirotechSystems Limited, Noida, India.
TraneTechnologies India Ltd., Bengaluru, India.
ARK Noise Control, ATHALYE GROUP HQ, Pune, India
Ecotone Systems Pvt. Ltd., Greater Noida, India
Himalyan Acoustics, Kool Pack & Allied Industries, Dharampur, India
SOUNDWORKS, Bengaluru, India.
Aimil Ltd., New Delhi, India.
Central Pollution Control Board, Government of India.
HEADacoustics GmbH, Germany.
HOTTINGER BRÜEL & KJAER, Denmark.
GRAS Sound & vibration, Denmark.
Manufacturingplants.
Mining industries.
Metallurgical Industries and plants
Air conditioning manufacturing industries
Automotive Industries
Aerospace and Aircraft Industries

Summary

Course Status :	Upcoming
Course Type :	Elective
Language for course content :	English
Duration :	12 weeks
Category :	Mechanical Engineering Advanced Dynamics and Vibration
Credit Points :	3
Level :	Undergraduate/Postgraduate
Start Date :	20 Jan 2025
End Date :	11 Apr 2025
Enrollment Ends :	27 Jan 2025
Exam Registration Ends :	14 Feb 2025
Exam Date :	03 May 2025 IST

Note: This exam date is subject to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1: Module 1: Introduction: Sound, Noise, and Vibrations; Human response to noise; Requirements for Noise control.

Week 2: Module 2: Acoustic Fundamentals: Sound wave propagation; acoustic wave equation; reflection, transmission, absorption, impedance; Intensity and Power; Wave-structure interaction – Radiation, Impact

Week 3: Module 2: Acoustic Fundamentals:Sound wave propagation; acoustic wave equation; reflection, transmission, absorption, impedance; Intensity and Power; Wave-structure interaction – Radiation, Impact.(Cont,..)

Week 4: Module 3: Sound Signal Analysis: Decibel levels; Time and frequency domain representation; Octave and one-third octave distributions.

Week 5: Module 4: Noise Measurement and Instrumentation: Sound measuring equipment – microphones, preamplifiers, sound level meters, noise dosimeters, Spectrum analysers; Measurement Standards and guidelines.

Week 6: Module 5: Principles of Noise Control: Source-path-receiver model; Control strategies and limitations; Noise criteria of spaces; integrated approach to low noise design; Passive noise control; Active noise control.

Week 7: Module 5: Principles of Noise Control: Source-path-receiver model; Control strategies and limitations; Noise criteria of spaces; integrated approach to low noise design; Passive noise control; Active noise control.(Cont,..)

Week 8: Module 6: Noise control materials: Barriers, enclosures, absorbers,resonators and metamaterials; Measures of noise control performance.

Week 9: Module 6: Noise control materials:Barriers, enclosures, absorbers, resonators and metamaterials; Measures of noise control performance.(Cont,..)

Week 10: Module 7: Noise in Mechanical Systems: Typical mechanical noisesources; mechanism of noise generation– vibration, impact, flow excitation,etc; Control of structure-borne vs air-borne noise.

Week 11: Module 8: Case studies: Noise control in reciprocating and rotatingmachinery - gears, bearing, engines; noise control in fluid flow systems -piping systems, HVAC appliance, aircrafts; Impact noise control - machinetools, presses; Environmental noise control and receiver protection.

Week 12: Module 8: Case studies:Noise control in reciprocating and rotating machinery - gears, bearing, engines; noise control in fluid flow systems - piping systems, HVAC appliance, aircrafts; Impact noise control - machine tools, presses; Environmental noise control and receiver protection.(Cont,..)

Books and references

•"Fundamental of Acoustics" by Kinsler, Frey, Coppens, Sanders, 4th edition,John wiley & Sons,2000.

• "Handbook of Noise and Vibration Control" by M. J. Crocker, John Wiley & Sons, 2007.

•"Engineering Noise Control" by Bies and Hansen, 4th edition, Spon Press, 2009.

•"Sound, Noise and Vibration Control" by Lyle F. Yerges, Van Nostrand Reinhold Company, 1969.

Instructor bio

Prof. Sneha Singh

IIT Roorkee

Prof. Sneha Singh, Working as a Assistant Professor at the Department of Mechanical & Industrial Engineering, 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, and by B.Tech. (Honours) from IIT Kharagpur in Manufacturing Science and Engineering in 2011. I am an author of 13 international journal papers of high repute and 23 international conference papers. I thoroughly enjoy teaching. 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, Machine Design, Theory of Production Processes, Engineering Analysis & Design, 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, She has been actively pursuing research in the field of Noise Control and Acoustics, and has 4 patents granted based on her cutting edge research in this area. She has also worked on various industrial sponsored problems related to noise control. I am pursuing research on Acoustic Metamaterials, and Noise Source Identification.

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: May 3, 2025 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 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

Please note that assignments encompass all types (including quizzes, programming tasks, and essay submissions) available in the specific week.

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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