Acoustic vibrations in fluids and solid structures involves essentially the propagation of wave motion through the supporting medium and the book treats it in a refreshing, I would even say in a new way. The subject of wave equations and their solutions are explained in physical terms. The book is classical in the sense that it is not concerned with machine computation except in the last and short chapter. Instead of the presently fashionable way of representing vibrating systems by lumped elements, the author develops in chapter 1 the wave equations in fluids and solids with simple solutions and the tools for representation like phasors and impedances. The powerful and simple Dirac delta function is used to explain point force excitation. The graph of the wave number k (an unfortunate terminology since it has the dimension of reciprocal length) versus the frequency (in rad/sec) is introduced here to explain dispersion relations and used again extensively later in the book. The author encourages the reader to think of waves using these tools. Chapter 2 treats the radiation of sound from vibrating surfaces in terms of the normal acceleration of the surface. Applications are flexural modes of panels and their radiation. An interesting result is the increase of radiation efficiency, hence
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