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本文采用一种类似于差分方法的集中质量有限元模型和人工边界透射理论分析倾斜成层弹性半空间中瞬态SH波的近场波动问题。文中对采用的有限元模型和波源的处理方法作了细致的描述,导出了各类节点的位移计算公式。对一种单斜层-半空间模型进行了数值计算。数值结果与广义射线法结果一致。此外,本文分析了倾斜层尖端区域的衍射效应,提供了该区域的数值结果。最后,本文对数值计算中的寄生振荡问题进行了探讨。
In this paper, a near-field fluctuation problem of transient SH waves in tilted layered elastic half-space is analyzed using a finite mass finite element model similar to the difference method and artificial boundary transmission theory. In this paper, the finite element model and wave source processing method are described in detail, and the displacement calculation formulas of various nodes are derived. A single slope-half-space model was numerically calculated. The numerical results are consistent with the results of the generalized ray method. In addition, this paper analyzes the diffraction effects at the tip region of the inclined layer and provides numerical results for this region. Finally, the problem of parasitic oscillations in numerical calculations is discussed in this paper.