Abstract
Nonlinear acoustics (NLA), within the framework of physical acoustics, has come of age over the past 30 years, yet new phenomena continue to be observed, so that the subject is not yet exhausted. The session will begin with a review of the mathematics of describing NLA (part 1). The analysis of one-dimensional phenomena will follow, plus the use of Burgers' equation (part 2). Data on the nonlinear parameter (B/A) will be reviewed (part 3). The physical aspects of nonlinear phenomena in two and three dimensions will be explored, and approximate methods of calculating the mutual effect of diffraction and nonlinearity will be described (part 4). The effects of the interaction of two sound beams will be considered (part 5). Applications will be treated. These include the development of parametric array sonar, surface wave devices, lithotripsy, and other medical applications (part 6). Such frontier topics as solitons and chaos will be touched on (part 7).
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