关键词: 超声波传播, 时域有限差分法, 完全匹配层, 数值方法, 吸收边界

Abstract: The simulation of pulsed ultrasonic propagation is of critical significance to signal analysis in practical ultrasonic testing. This article uses a finite difference time domain method to study the two-dimensional sound field characteristics of elastic solids based on elastic solid equations. A perfect matched layer method is used to resolve the numerical simulation in free space. Simulation calculation results indicate that the method can be used in the analysis of an anisotropic medium. Numerical results of the ultrasonic propagation characteristics in a liquid-solid coupled interface are in accord with those obtained by photo-elastic experiments. Validity and feasibility of the finite difference time domain method is demonstrated by the echo-wave signal of a flat bottom hole block.

Key words: ultrasonic propagation, finite difference time domain method, perfect matched layer, numerical method, absorbing boundary