Overview

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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, IndiaEcotone 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

Syllabus

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, ImpactWeek 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,..)