中文摘要：

表面在钢的一件样品宣传的声学的波浪(锯) 被使用有限元素方法模仿(女性) 。波浪被负担功能与象阶段速度分散和宽带宽那样的繁殖性质激动。由表面缺点组成的一个二维的模型与一条宽带装载了 0.1 s 排水量功能在时间和频率领域被调查的 50200 MHz 和短时间。由短暂动态分析， Fourier 变换和分散计算，从察觉到点宣传波浪和回答的快照被介绍。这条管理途径对表面裂缝和思考敏感，这被显示。

英文摘要：

The surface acoustic wave （SAW） propagating in a sample of steel is simulated by using finite element method （FEM）. The waves are excited by a load function with propagation properties such as phase velocity disper- sion and wide bandwidth. A two-dimensional model consisting of surface defects loaded with a wideband 50--200 M Hz and short time 0.1 gs displacement function is investigated in the time and frequency domains. By transient dy- namic analysis, Fourier transform and dispersion calculation, snapshots of propagating wave and responses from sens- ing points are presented. It is indicated that this supervision approach is sensitive to the surface cracks and reflections.