Nonlinear Acoustics: Periodic Waveguide, Scattering of Sound by Sound, Three-Layer Fluid, Finite Amplitude Sound in a Medium Having a Distribution of Relaxation Processes, and Production of an Isolated Negative Pulse in Water

摘要

Research on nonlinear acoustics has been carded out during the 12-month periodending 30 September 1992. Progress is reported on the following projects: (1) Propagation in a periodic waveguide; (2) Scattering of sound by sound; (3) Finite-amplitude waves in a three-layer fluid; (4) Finite-amplitude waves in a medium having a distribution of relaxation processes; and, (5) Propagation of an isolated negative-pressure pulse in water.... Nonlinear acoustics, Dispersion, Relaxing media, Bloch waves, Scattering of sound by sound, Generalized Burgers equation, Periodic waveguide, Reflection, Unipolar negative pulse.