摘要
通过用频域方法数值求解KZK方程;以活塞声场为例,研究了非线性超声束的冲击波形成规律。结果表明:除了非线性强度、吸收外,衍射是另一个影响非线性超声束冲击波形成的重要因素。文章发现在不同的衍射条件下的活塞声场的冲击波形成距离有很大差异。最后,还比较了不同参数下冲击波形成时的声压波形和冲击波形成的空间分布。
The shock formation in a nonlinear ultrasound beam by solving KZK equation using frequency-domain numerical method is investigated. The results reveal that besides the nonlinearity and absorption, the diffraction is another important factor that affects the shock formation of an ultrasound beam. It also reveals that the shock formation distances of piston field are much different under different diffraction conditions. At last, the waveform of sound pressure at the formation of shock and the spatial distribution of shock formation are also presented and discussed.
出处
《声学学报》
EI
CSCD
北大核心
2004年第2期115-121,共7页
Acta Acustica
基金
国家自然科学基金(19834040和10074035)
