Abstract
Acoustics is a mathematical study of sound waves in solids, liquids, and gases. This chapter deals with sound propagation in horns, pipes, wave guides, periodic structures, and mufflers. Aim of this chapter is to create basic understanding of acoustic processes mathematically. Some equations like Webster's horn equation, Helmholtz equation and their applications are explained here in detail. The chapter includes the different types of horns and shows that exponential horns can be used as a high pass filter. A study of sonic crystal is done here, which explains how a sonic crystal acts as a frequency filter. This chapter helps to understand the distribution of sound energy in different manner like diffraction, scattering, reflection, and refraction. The chapter explains different wave harmonics in pipes and sound transmission in waveguides and mufflers.
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