摘要
Epstein和Carhart,Allegra和Hawley先后研究建立起的超声谱颗粒粒径测量的经典理论模型——ECAH,针对直接求解ECAH理论模型预测颗粒两相系中物理量声衰减系数时出现的困难,通过构造与Bessel(Hankel)函数有关的新变量,改造原有系数矩阵,降低矩阵的条件数,避免了数值溢出问题,拓展该模型的计算范围至频率100MHz和毫米级颗粒,通过与BLBL(Bouguer-Lambert-Beer-Law)散射方法的比较验证了文中提出的改进方法的有效性。
By analyzing the difficulties of ultrasonic attenuation calculation with directly solving method for the ECAH model in particulate two-phase systems,a novel approach to constructing new variants involved in Bessel（Hankel） function is put forward,which can significantly decrease the condition number,and avoid numerical overflow to enlarges the available evaluation range to frequency 100MHz for particles of millimeters size.A comparison with BLBL scattering method validates the effectiveness of the modified algorithm proposed in this paper.
出处
《声学技术》
CSCD
2010年第6期591-594,共4页
Technical Acoustics
基金
国家自然科学基金(50706029
50836003)
上海市科委科技项目(10540501000)
关键词
超声
颗粒测量
散射
衰减
ultrasonic
particle sizing
scattering
attenuation
