Abstract
In honor of David Blackstock, this presentation recalls his contributions regarding nonlinear acoustics in the areas of reflection and refraction. Some of this is well documented and other pieces are not. For example, in his 1960 Ph.D. dissertation David was the first to recognize Pfriem’s pressure amplification equation would apply to finite amplitude plane-wave reflection from a rigid surface. Acoustic pressure MORE than doubles for finite amplitude rigid surface reflection, and it is the variational sound speed that exactly doubles. And this result provides a basis for an understanding of oblique reflection and the formation of finite amplitude Mach stems. Further, the work of David’s Ph.D. student Frederick Cotaras on finite amplitude refraction from 1989 will be highlighted in addition to other contributions as time permits.
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