FOCUSING OF HIGH POWER ULTRASOUND BEAMS AND LIMITING VALUES OF SHOCK WAVE PARAMETERS.

Area of Science:

• Acoustics
• Nonlinear Acoustics
• Ultrasound

Background:

• Focused ultrasound systems are crucial for various applications.
• Understanding nonlinear and diffraction effects is key to optimizing performance.
• High power ultrasound can exhibit complex acoustic field behaviors.

Purpose of the Study:

• To investigate the influence of nonlinear and diffraction effects on focused ultrasound amplification.
• To determine the limiting values of acoustic field parameters in high power focused ultrasound.
• To model and analyze nonlinear acoustic fields under pre- and post-shock formation conditions.

Main Methods:

• Numerical modeling using the Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation.
• Simulation of acoustic fields in a weakly dissipative medium.
• Comparison of numerical solutions with experimental data and analytic predictions.

Main Results:

• Nonlinear and diffraction effects significantly impact amplification factors.
• Limiting values for acoustic field parameters were identified.
• Solutions were obtained for both pre- and post-shock formation scenarios.

Conclusions:

• The study provides insights into the behavior of high power focused ultrasound.
• Numerical modeling accurately predicts acoustic field parameters.
• Findings are validated against experimental and analytical results.