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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 04 - Beats

Lecture Overview: 1) Beats phenomena - Mathematical explanation. 2) Typical sound pressures.


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