NPTEL : NOC:Noise Management and Control (Mechanical Engineering)

Co-ordinators : Prof. Nachiketa Tiwari


Lecture 1 - Course Overview

Lecture 2 - Introduction

Lecture 3 - Nature Of Sound

Lecture 4 - Beats

Lecture 5 - The Decibel Scale

Lecture 6 - Key Terms in Acoustics

Lecture 7 - Decibel Scale - Part 1

Lecture 8 - Decibel Scale - Part 2

Lecture 9 - Decibel Scale - Part 3

Lecture 10 - Complex Numbers

Lecture 11 - Complex Time Function

Lecture 12 - Linear Systems

Lecture 13 - Transfer Functions

Lecture 14 - Introduction to One Dimensional Wave Equation

Lecture 15 - The Momentum Equation

Lecture 16 - The Continuity Equation and The Gas Law

Lecture 17 - One Dimensional Wave Equation

Lecture 18 - Solution for One Dimensional Wave Equation

Lecture 19 - Transmission Line Equations

Lecture 20 - One Dimensional Example Problems

Lecture 21 - Impedance

Lecture 22 - Pressure Wave Travels in a Closed Tube

Lecture 23 - Standing Wave Formation in a Closed Tube With Rigid Termination

Lecture 24 - Pressure Wave Travels in an Open Tube

Lecture 25 - 1-D sound wave propagation: Kundt’s tube - I

Lecture 26 - 1-D sound wave propagation: Kundt’s tube - II

Lecture 27 - Radially propagating sound waves in spherical coordinate system - I

Lecture 28 - Radially propagating sound waves in spherical coordinate system - II

Lecture 29 - Complex impedance for radially propagating sound waves in spherical coordinate system

Lecture 30 - Volume velocity - I

Lecture 31 - Interference of 1-D spherically propagating sound waves - I

Lecture 32 - Interference of 1-D spherically propagating sound waves - II

Lecture 33 - Noise sources and introduction to microphones

Lecture 34 - Classification of microphones - I

Lecture 35 - Classification of microphones - II

Lecture 36 - Classification of microphones - III

Lecture 37 - Microphone Parameters

Lecture 38 - Understanding microphone specifications

Lecture 39 - Noise Source: Terminology

Lecture 40 - Noise Source: Sound Attenuation

Lecture 41 - Noise Source: Sound Pressure Level due to a noise source located outdoors

Lecture 42 - Noise Source: Role of reflecting surfaces

Lecture 43 - Noise Source: Sound Pressure Level due to a noise source located indoors - Part I

Lecture 44 - Noise Source: Sound Pressure Level due to a noise source located indoors - Part II

Lecture 45 - Measuring Sound Power Level - Understanding standard octave bands

Lecture 46 - Measuring Sound Power Level - Fan noise - Part I

Lecture 47 - Measuring Sound Power Level - Fan noise - Part II

Lecture 48 - Measuring Sound Power Level - Fan noise - Part III

Lecture 49 - Weighting

Lecture 50 - Noise coming from Motors

Lecture 51 - Noise coming from Motors and Pumps

Lecture 52 - Noise coming from Pump and Motor Working Simultaneously

Lecture 53 - Noise coming from Compressors

Lecture 54 - Example problems regarding Noise coming from Compressor

Lecture 55 - Noise Spread Mechanisms

Lecture 56 - Reverberation time

Lecture 57 - Reverberation time example problem

Lecture 58 - Noise from Adjacent Room

Lecture 59 - Acoustic Enclosures

Lecture 60 - Acoustic Enclosures - Example Problems

Lecture 61 - Large acoustical enclosures - I

Lecture 62 - Large acoustical enclosures - II

Lecture 63 - Acoustic barriers - I

Lecture 64 - Acoustic barriers - II

Lecture 65 - Acoustic barriers - III

Lecture 66 - Helmholtz resonator - I

Lecture 67 - Silencers

Lecture 68 - Side Branched Mufflers - I

Lecture 69 - Side Branched Mufflers - II

Lecture 70 - Side Branched Mufflers - III

Lecture 71 - Expansion Chamber Muffler

Lecture 72 - Single Expansion Chamber Muffler