The acoustical wave equation is presented a serial spatial and time iterative equations and room acoustics field is simulated using finite difference time domain method.

时域有限差分法将声波基本方程表示为一个时间和空间的迭代方程组，实现对室内声场中低频段的模拟计算。

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The neutral stability curves and the character parameters are given, including the temporal and spatial growth rate, the critical wave number, the maximum wave number and the wave celerity.

获取表征液膜稳定特征的中性稳定性曲线、扰动的时间和空间增长率、临界波数、最大波数、波速的变化趋势；

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Based on it, the elastic wave velocity spatial distribution around a cased hole in tectonic stress field is studied by applying the velocity-stress formula of equivalent medium model.

在此基础之上，应用等效介质模型的速度—应力关系式，研究了地应力场中套管井周弹性波速的空间分布规律。

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