超声波时域仿真的局部共形技术  

Local conformal technique of acoustic wave simulation in time domain

作　　者：刘颖[1] 郑宏兴[1] 黄文武[2] 马兴兵[1] 成丹[1] 

机构地区：[1]天津工程师范学院电子工程系,天津300222 [2]中国科学院电子学研究所,北京100080

出　　处：《天津工程师范学院学报》2008年第1期6-11,共6页Journal of Tianji University of Technology and Education

基　　金：天津市应用基础及前沿技术研究计划项目(07JCYDJC16800).

摘　　要：采用时域有限差分(FDTD)方法模拟声波的传播,以解决超声探测的动态计算机仿真问题。建立了声波模拟的速度-压力交错网格有限差分模型,给出了声波支配方程的FDTD离散形式及非均匀流体媒质内部边界的处理方法,并详细讨论了完全匹配层吸收边界及其有限差分算法的实现。数值实验验证了上述计算方法的有效性。In order to obtain the dynamic computer model of the ultrasonic exploration, the finite-difference time domain method is applied to simulating the acoustic wave propagation.The model of the velocity-stress staggered-grid finite-difference on acoustic waves has been set up based on the Yee＇ s algorithm.The governing equations of acoustic waves from a first order formula are obtained, which are separated by using centered difference approximation.The processing method of inhomogeneous liquid media across borderline is presented and the construction of perfectly matched layer is discussed in detail.The implementation of finite-difference scheme of the PML boundary conditions is also studied.Numerical experiments have proved the effectiveness of the proposed algorithm.

关 键 词：声波 时域有限差分方法 完全匹配层 吸收边界条件 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]