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FDTD方法的改进及在超声波声场计算中的应用

, PP. 78-82

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Abstract:

时域有限差分法(FDTD,FiniteDifferenceTimeDomain)是建立超声检测模型的有效手段,然而在相邻两种介质的分界面上,两种介质声阻抗的突变会引起差分计算的不稳定.为了解决上述问题,从常规FDTD方法入手,提出将界面两边介质的声学参数在界面处进行平均处理的方法,对FDTD方法进行了改进;然后分别采用常规FDTD方法和改进方法对相邻两种介质声阻抗相差5个数量级的模型进行了声场计算;最后对超声换能器进行了有限差分声场计算和实际检测实验对比.研究结果表明改进的FDTD方法是超声波声场计算中一种有效可行的数值方法.

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