The book deals with various types of mufflers and silencers, such as reactive mufflers, dissipative silencers, perforated element mufflers, baffle silencers and louvers. It also presents analytical methods for the analysis and design of acoustical mufflers, such as the frequency-domain approach, the time-domain approach and the three-dimensional approach. The book includes equations, figures, tables, references, and solved examples and unsolved exercises with answers, making it suitable for both students and practitioners.
The book is divided into eight chapters, as follows:
Chapter 1: Introduction. This chapter provides an overview of the scope and objectives of the book, as well as some basic concepts and definitions in acoustics.
Chapter 2: Propagation of Waves in Ducts. This chapter discusses the propagation of plane waves, spherical waves and higher-order modes in uniform and non-uniform ducts, as well as the radiation impedance and reflection coefficient at open or closed ends.
Chapter 3: Dissipative Ducts and Parallel Baffle Mufflers. This chapter introduces the concept of dissipative ducts and parallel baffle mufflers, which are widely used for noise control in ventilation systems. It also derives the transfer matrix method for analyzing these types of mufflers.
Chapter 4: Reactive Mufflers. This chapter focuses on reactive mufflers, which are based on the principle of interference or cancellation of sound waves. It covers various configurations of reactive mufflers, such as expansion chambers, Helmholtz resonators, side-branch resonators and concentric tube resonators.
Chapter 5: Three-Dimensional Analysis of Mufflers. This chapter extends the analysis of mufflers to three dimensions, using numerical methods such as finite element method (FEM) and boundary element method (BEM). It also presents some examples of three-dimensional analysis of complex muffler geometries.
Chapter 6: Theory of Acoustic Filters. This chapter develops the theory of acoustic filters, which are devices that modify the frequency spectrum of sound waves. It covers various types of acoustic filters, such as low-pass filters, high-pass filters, band-pass filters and band-stop filters.
Chapter 7: Perforated Element Mufflers. This chapter deals with perforated element mufflers, which are composed of perforated tubes or plates that create a distributed resistance to sound waves. It also discusses the effects of flow on the acoustic performance of these mufflers.
Chapter 8: Flow-Acoustic Analysis of Multiply-Connected Perforated-Element Mufflers. This chapter presents a general method for analyzing multiply-connected perforated-element mufflers, which are composed of several interconnected chambers with perforated elements. It also shows some applications of this method to practical muffler designs.
The book is available from Wiley or Google Books. You can also access a PDF version from Perlego or a electronic resource from Penn State University Libraries.
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