Title :
Model of the phase screen for nonlinear acoustic waves [atmosphere]
Author :
Khokhlova, V.A. ; Rudenko, O.V.
Author_Institution :
Dept. of Acoust., Moscow State Univ., Russia
Abstract :
Theoretical approach for the description of nonlinear acoustic waves transmitted through randomly inhomogeneous thin layer (phase screen) is presented. An exact analytical solutions of governing equations are obtained both for the spatial structure of the field behind the screen and for the temporal waveform. Using this model statistical characteristic of a single N-pulse having passed through the screen is studied. The influence of the random focusing and defocusing effect on the statistical properties of N-wave behind the screen is analyzed. Distribution functions for the shock amplitude, overpressure probability density, and ray convergency are presented. It is shown that the spatial modulation of the phase front affects the average characteristics of the field and causes the strong variations of the wave field parameters
Keywords :
acoustic field; acoustic focusing; acoustic wave transmission; atmospheric acoustics; meteorology; nonlinear acoustics; shock waves; N-pulse; average characteristics; defocusing; distribution functions; exact analytical solutions; nonlinear acoustic waves; overpressure probability density; phase front; phase screen; random focusing; randomly inhomogeneous thin layer; ray convergency; shock amplitude; spatial modulation; spatial structure; temporal waveform; wave field parameters; Acoustic distortion; Acoustic propagation; Acoustic waves; Atmosphere; Electric shock; Equations; Nonlinear acoustics; Nonlinear distortion; Phase distortion; Phase modulation;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495647
