Simulation of the Nonlinear Acoustic Field Generated by a Concave Spherical Transducer in Multi-layer Mediums
We simulate the acoustic field generated by a concave spherical transducer by using two different models. One model consists of two mediums and the other is comprised of four mediums. It is found that the nonlinear effects are affected by excitation frequency, radiation intensity, half-aperture angle and medium thickness, and behaves relatively stronger in the focusing point and the interface where two adjoining mediums have larger discrepancy of nonlinear parameter value. As the excitation frequency increases, the nonlinear effects will enhance in the interface but lower in the focus. In focal region the nonlinear effect becomes remarkable with increasing the acoustic intensity on the source face and has some drop while the half-aperture angle widens. When the medium with largely nonlinear parameter value becomes incrassate, the nonlinear effect weakens and the sound pressure reduces.
nonlinear acoustic field concave spherical transducer multi-layer mediums nonlinear effections KZK equation
Jiwen Hu Shengyou Qian
College of Physics and Information Science Hunan Normal University Changsha 410081,P.R.China College College of Mathematics and Physics Nanhua University Hengyang 421001,P.R.China
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）