Sound Propagation

In Sound Propagation: An Impedance Based Approach, Professor Yang-Hann Kim introduces acoustics and sound fields by using the concept of impedance. Kim starts with vibrations and waves, demonstrating how vibration can be envisaged as a kind of wave, mathematically and physically. One-dimensional waves are used to convey the fundamental concepts. Readers can then understand wave propagation in terms of characteristic and driving point impedance. The essential measures for acoustic waves, such as dB scale, octave scale, acoustic pressure, energy, and intensity, are explained. These measures are all realized by one-dimensional examples, which provide mathematically simplest but clear enough physical insights. 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 in a unified way, by seeing the changes of waves due to spatially distributed impedance. Lastly, Kim covers sound in closed space, which is considered to be a space that is surrounded by spatially distributed impedance, and introduces two spaces: acoustically large and small space. The bulk of the book is concerned with introducing core fundamental concepts, but the appendices are included as the essentials as well to cover other important topics to extend learning.

Offers a less mathematically-intensive means to understand the subject matter
Provides an excellent launching point for more advanced study or for review of the basics
Based on classroom tested materials developed over the course of two decades
Companion site for readers, containing animations and MATLAB code downloads
Videos and impedance data available from the author’s website
Presentation slides available for instructor use

Sound Propagation is geared towards graduate students and advanced undergraduates in acoustics, audio engineering, and noise control engineering. Practicing engineers and researchers in audio engineering and noise control, or students in engineering and physics disciplines, who want to gain an understanding of sound and vibration concepts, will also find the book to be a helpful resource.

Author Biography

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.