Delivers the key essentials of acoustics in an approachable manner, allowing students and engineers to easily understand this interdisciplinary topic Kim introduces acoustics and sound fields by using the important concept of impedance, making the subject of acoustics more accessible to both students and engineers. Kim starts with vibrations and waves, demonstrating how vibration can be envisaged as a kind of wave, mathematically and physically, before moving onto the study of acoustic waves. Onedimensional waves are introduced since they are the simplest to understand while demonstrating the same mathematical and physical characteristics that all general waves have. Readers will then be able to determine a means of finding solutions of acoustic wave equations. Kim then moves on to explaining waves on a flat surface of discontinuity, demonstrating how propagation characteristics of waves change in space when there is a distributed impedance mismatch. Next is a chapter on radiation, scattering, and diffraction, where Kim shows how these topics can be explained with one of two approaches: finding the solutions that satisfy a linear acoustic wave equation and boundary condition or use the integral equations. Lastly, Kim covers sound in closed space. The bulk of the book is concerned with introducing core fundamental concepts, but an appendix is included as well to cover other important topics to extend learning. Offers a less mathematicallyintensive means to understand the subject manner Provides an excellent launching point for more advanced study or for review of the basics

Author Biography

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Yang-Hann Kim is a Professor of Mechanical Engineering at Korea Advanced Institute of Science and Engineering (KAIST), where he is also Director of the Center for Noise and Vibration Control (NOVIC). He has been teaching acoustics at undergraduate and graduate levels for more than 20 years. Kim's research interests include sound visualization, active noise/vibration control, sound focusing, structural acoustics and duct acoustics. He has won numerous awards, including the Excellence Award in Technology Teaching from Ministry of Industrial Development, Second Place Award at the Gallery of Acoustics during the 132nd meeting of the ASA, and other awards at KAIST and from Korean acoustical societies. He is an active with various journals and societies, having served on the editorial board of the Journal of Sound and Vibration for 11 years and continuing to serve on the Editorial Board as the Handling editor of the Journal of Mechanical Systems and Signal Processing. Kim holds a B.S in Naval Architecture and Marine Engineering from Seoul National University and a PhD in Mechanical Engineering from MIT.

Table of Contents

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Preface	p. xi
Acknowledgments	p. xv
Vibration and Waves	p. 1
Introduction/Study Objectives	p. 1
From String Vibration to Wave	p. 1
One-dimensional Wave Equation	p. 7
Specific Impedance (Reflection and Transmission)	p. 10
The Governing Equation of a String	p. 14
Forced Response of a String: Driving Point Impedance	p. 17
Wave Energy Propagation along a String	p. 22
Chapter Summary	p. 25
Essentials of Vibration and Waves	p. 25
Single- and Two-degree of Freedom Vibration Systems	p. 25
Fourier Series and Fourier Integral	p. 34
Wave Phenomena of Bar, Beam, Membrane, and Plate	p. 36
Exercises	p. 59
Acoustic Wave Equation and Its Basic Physical Measures	p. 69
Introduction/Study Objectives	p. 69
One-dimensional Acoustic Wave Equation	p. 69
Acoustic Intensity and Energy	p. 77
The Units of Sound	p. 85
Analysis Methods of Linear Acoustic Wave Equation	p. 96
Solutions of the Wave Equation	p. 103
Chapter Summary	p. 110
Essentials of Wave Equations and Basic Physical Measures	p. 110
Three-dimensional Acoustic Wave Equation	p. 110
Velocity Potential Function	p. 116
Complex Intensity	p. 116
Singular Sources	p. 118
Exercises	p. 125
Waves on a Flat Surface of Discontinuity	p. 129
Introduction/Study Objectives	p. 129
Normal Incidence on a Flat Surface of Discontinuity	p. 129
The Mass Law (Reflection and Transmission due to a Limp Wall)	p. 134
Transmission Loss at a Partition	p. 140
Oblique Incidence (Snell's Law)	p. 144
Transmission and Reflection of an Infinite Plate	p. 149
The Reflection and Transmission of a Finite Structure	p. 153
Chapter Summary	p. 156
Essentials of Sound Waves on a Flat Surface of Discontinuity	p. 156
Locally Reacting Surface	p. 156
Transmission Loss by a Partition	p. 159
Transmission and Reflection in Layers	p. 159
Snell's Law When the Incidence Angle is Larger than the Critical Angle	p. 168
Transmission Coefficient of a Finite Plate	p. 169
Exercises	p. 172
Radiation, Scattering, and Diffraction	p. 177
Introduction/Study Objectives	p. 177
Radiation of a Breathing Sphere and a Trembling Sphere	p. 178
Radiation from a Baffled Piston	p. 188
Radiation from a Finite Vibrating Plate	p. 196
Diffraction and Scattering	p. 201
Chapter Summary	p. 213
Essentials of Radiation, Scattering, and Diffraction	p. 214
Definitions of Physical Quantities Representing Directivity	p. 214
The Radiated Sound Field from an Infinitely Baffled Circular Piston	p. 217
Sound Field at an Arbitrary Position Radiated by an Infinitely Baffled Circular Piston	p. 218
Understanding Radiation, Scattering, and Diffraction Using the Kirchhoff-Helmholtz Integral Equation	p. 219
Scattered Sound Field Using the Rayleigh Integral Equation	p. 236
Theoretical Approach to Diffraction Phenomenon	p. 237
Exercises	p. 265
Acoustics in a Closed Space	p. 273
Introduction/Study Objectives	p. 273
Acoustic Characteristics of a Closed Space	p. 273
Theory for Acoustically Large Space (Sabine's theory)	p. 274
Direct and Reverberant Field	p. 282
Analysis Methods for a Closed Space	p. 287
Characteristics of Sound in a Small Space	p. 292
Duct Acoustics	p. 302
Chapter Summary	p. 312
Essentials of Acoustics in a Closed Space	p. 313
Methods for Measuring Absorption Coefficient	p. 313
Various Reverberation Time Prediction Formulae	p. 317
Sound Pressure Distribution in Closed 3D Space Using Mode Function	p. 319
Analytic Solution of ID Cavity Interior Field with Any Boundary Condition	p. 320
Helmholtz Resonator Array Panels	p. 323
Exercises	p. 335
Index	p. 339
Table of Contents provided by Ingram. All Rights Reserved.

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