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Acoustics

Acoustics. Instructor: Prof. Nachiketa Tiwari, Department of Mechanical Engineering, IIT Kanpur. This course discusses topics in acoustics: acoustics fundamentals, terminology, 1-D wave equation in Cartesian coordinates and in spherical coordinates, transmission line equations, electromechanical transduction and mechano-acoustic transduction using lumped parameter approach, modeling of complex electro-magnetic-mechanical-acoustic systems, sound radiation, propagation and attenuation of sound, waveguides, and the interplay between vibrations and acoustics. (from nptel.ac.in)

Lecture 10 - Thermodynamic Processes during Sound Transmission

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Concept Review

Lecture 01 - Introduction, Sound Wave vs Vibration, Different Types of Waves

Lecture 02 - Review: Linearity, Complex Numbers and Spring Mass System

Lecture 03 - Review: Poles and Zeros, Phase and Magnitude Plots, Transfer Functions, Bode Plots

Lecture 04 - Review: Transfer Function and Bode Plots

1-D Wave Equation

Lecture 05 - 1-D Wave Equation and its Solution

Lecture 06 - Solution for 1-D Wave Equation

Lecture 07 - Waveguides, Transmission Line Equations and Standing Waves

Lecture 08 - Waveguides, Transmission Line Equations and Standing Waves (cont.)

Lecture 09 - Examples of 1-D Waves in Tubes, Short tubes, Kundt's Tube

Lecture 10 - Thermodynamic Processes during Sound Transmission

Lecture 11 - Numerical Examples 1

Sound Transmission

Lecture 12 - Sound Transmission through Walls

Lecture 13 - Sound Transmission through Walls (cont.)

Lecture 14 - Leakage in Walls, Sound Transmission Class Ratings, Octave Bands

1-D Waves

Lecture 15 - Instantaneous Power Flow

Lecture 16 - Radial Propagation of Sound, Monopoles, and Dipoles

Lecture 17 - Radial Propagation of Sound, Monopoles, and Dipoles (cont.)

Lecture 18 - Radial Propagation of Sound, Monopoles, and Dipoles (cont.)

Lecture 19 - Numerical Examples 2

Lecture 20 - Numerical Examples 3

Directivity

Lecture 21 - Directivity: Expression of Pressure

Lecture 22 - Directivity of Different Sound Sources

Lecture 23 - Directivity Pattern associated with Sound Sources

Lecture 24 - Directivity Pattern associated with the Doublet

Lumped Parameter Modeling of Transducers

Lecture 25 - Generalized Elements

Lecture 26 - Examples of Electromechanical Systems

Lecture 27 - Transformers, Radiation Impedance, and Helmholtz Resonator

Lecture 28 - Radiation Impedance

Lecture 29 - Radiation Impedance (cont.)

Lecture 30 - Models of Electromechanical Acoustics System

Lecture 31 - Solution of Loudspeaker Model

Lecture 32 - Microphones

Lecture 33 - Vibrometer, Seismometer, Accelerometer, Shaker Table

Sound in Public Spaces and Noise Management

Lecture 34 - Sound Propagation in Rooms, 1-D Rooms, 2-D Rooms

Lecture 35 - Sound in 3D Rooms

Lecture 36 - Absorption Coefficient, and Irregular Rooms

Lecture 37 - Room Constant, and Sabine's Coefficient

Lecture 38 - Design of a muffler

Lecture 39 - Noise in Machines, Basics of Noise Management