高功率超声束的聚焦与冲击波参数的极限值
FOCUSING OF HIGH POWER ULTRASOUND BEAMS AND LIMITING VALUES OF SHOCK WAVE PARAMETERS.
作者信息
Bessonova O V, Khokhlova V A, Bailey M R, Canney M S, Crum L A
机构信息
Department of Acoustics, Physics Faculty, Moscow State University, Leninskie gory, Moscow, 119992, Russia.
出版信息
Acoust Phys. 2009 Jul 21;55(4-5):463-476. doi: 10.1134/S1063771009040034.
Abstract
In this work, the influence of nonlinear and diffraction effects on amplification factors of focused ultrasound systems is investigated. The limiting values of acoustic field parameters obtained by focusing of high power ultrasound are studied. The Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation was used for the numerical modeling. Solutions for the nonlinear acoustic field were obtained at output levels corresponding to both pre- and post- shock formation conditions in the focal area of the beam in a weakly dissipative medium. Numerical solutions were compared with experimental data as well as with known analytic predictions.
摘要
在这项工作中，研究了非线性和衍射效应对焦域超声系统放大因子的影响。研究了高功率超声聚焦所获得的声场参数的极限值。采用Khokhlov-Zabolotskaya-Kuznetsov（KZK）方程进行数值模拟。在弱耗散介质中，在与束流焦域内激波形成前后条件相对应的输出水平下，获得了非线性声场的解。将数值解与实验数据以及已知的解析预测结果进行了比较。
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