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Noise Management and its Control

Noise Management and its Control. Instructor: Prof. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. This course is intended for all those who want to understand noise, its control, and its management. Thus, the course is open to students of engineering and science, and also to all those who from the industry and research organizations - who are working in area of sound, NVH and acoustics. Each lecture will be followed by a quiz, which will help student the concepts better, and gain deeper insights to measurement process. The course is fairly generic so that there is no need for a particular background. Rather, what is needed is openness, and ability to learn and check out new ideas with comfort. (from nptel.ac.in)

Lecture 19 - Transmission Line Equations

This lecture covers the following areas: 1) Wave guide. 2) Wave travelling in one dimension. 3) Transmission line equation for pressure. 4) Complex pressure amplitude. 5) Transmission line equation for velocity.

Go to the Course Home or watch other lectures:

Lecture 01 - Course Overview

Lecture 02 - Introduction

Lecture 03 - Nature of Sound: Beats Phenomena

Lecture 04 - Beats

Lecture 05 - The Decibel Scale

Lecture 06 - Key Terms in Acoustics

Lecture 07 - Decibel Scale

Lecture 08 - Decibel Scale (cont.)

Lecture 09 - Decibel Scale: Adding up Decibels for Correlated Signals

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 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 - 1D Sound Wave Propagation: Kundt's Tube

Lecture 26 - 1D Sound Wave Propagation: Kundt's Tube (cont.)

Lecture 27 - Radially Propagating Sound Waves in Spherical Coordinate System

Lecture 28 - Radially Propagating Sound Waves in Spherical Coordinate System (cont.)

Lecture 29 - Complex Impedance for Radially Propagation Sound Waves in Spherical Coordinate Systems

Lecture 30 - Volume Velocity

Lecture 31 - Interference of 1D Spherically Propagating Sound Waves

Lecture 32 - Interference of 1D Spherically Propagating Sound Waves (cont.)

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

Lecture 44 - Noise Source: Sound Pressure Level due to a Noise Source Located Indoors (cont.)

Lecture 45 - Measuring Sound Power Level - Understanding Standard Octave Bands

Lecture 46 - Measuring Sound Power Level - Fan Noise

Lecture 47 - Measuring Sound Power Level - Fan Noise (cont.)

Lecture 48 - Measuring Sound Power Level - Fan Noise (cont.)

Lecture 49 - Weighting

Lecture 50 - Noise Coming from Motors

Lecture 51 - Noise Coming from Motors and Pumps

Lecture 52 - Noise Coming from Pumps and Motors Working Simultaneously

Lecture 53 - Noise Coming from Compressors

Lecture 54 - Example Problems Regarding Noise Coming from Compressors

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

Lecture 62 - Large Acoustical Enclosures (cont.)

Lecture 63 - Acoustic Barriers

Lecture 64 - Acoustic Barriers (cont.)

Lecture 65 - Acoustic Barriers (cont.)

Lecture 66 - Helmholtz Resonator

Lecture 67 - Silencers

Lecture 68 - Side Branched Mufflers

Lecture 69 - Side Branched Mufflers (cont.)

Lecture 70 - Side Branched Mufflers (cont.)

Lecture 71 - Expansion Chamber Muffler

Lecture 72 - Single Expansion Chamber Muffler