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.

中文翻译：

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聚焦高功率超声波束和限制冲击波参数值。

在这项工作中，研究了非线性和衍射效应对聚焦超声系统放大系数的影响。研究了高功率超声聚焦获得的声场参数的极限值。Khokhlov-Zabolotskaya-Kuznetsov (KZK) 方程用于数值建模。非线性声场的解是在对应于弱耗散介质中波束焦点区域中冲击前和冲击后形成条件的输出水平下获得的。数值解与实验数据以及已知的分析预测进行了比较。