NONLINEAR AND PARAMETRIC PHENOMENA IN DISPERSIVE ACOUSTIC SYSTEMS.

L. A. Ostrovsky, I. A. Soustova, A. M. Sutin

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Abstract

Some results of the theoretical and experimental investigations of the dispersion nonlinear acoustics phenomena in acoustic waveguides and resonators are discussed. In such systems the dispersion provides the possibility of resonant energy transformation between different modes at selected frequencies. The following processes are considered: parametric amplification of travelling waves in waveguides, parametric generation of sound (PGS) in resonators with fluid and ring solid-state resonators; auto-modulation of intensive sound; multifrequency processes including a quasi-noise generation; propagation of stationary acoustic pulses (elastic solitons) in solid rods and peculiarities of their dissipation. In a number of simple cases the experiments show a good quantitative agreement with the theory but some anomalous phenomena were observed (including the time relaxation of parametric generation threshold, and third harmonic generation), which are apparently associated with the dislocation motions in solids.

Original languageEnglish
Pages (from-to)298-306
Number of pages9
JournalAcustica
Volume39
Issue number5
StatePublished - 1978

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