Problems In Nonlinear Acoustics: pulsed finite amplitude sound beams, nonlinear acoustic wave propagation in a liquid layer, nonlinear effects in asymmetric cylindrical sound beams, effects of absorption on the interaction of sound beams and parametric re

摘要

This report discusses five projects all of which involve basic theoretical research in nonlinear acoustics. (1) Pulsed Finite Amplitude Sound Beams are studied with a recently developed time domain computer algorithm that solves the KZK nonlinear parabolic wave equation. (2) Nonlinear Acoustic Wave Propagation in a Liquid Layer is a study of harmonic generation and acoustic soliton information in a liquid between a rigid and a free surface. (3) Nonlinear Effects in Asymmetric Cylindrical Sound Beams is a study of source asymmetries and scattering of sound by sound at high intensity. (4) Effects of Absorption on the Interaction of Sound Beams is a completed study of the role of absorption in second harmonic generation and scattering of sound by sound. (5) Parametric Receiving Arrays is a completed study of parametric reception in a reverberant environment.