Abstract To solve scattering problems with multi-transmitting boundary, we present an improved wave motion input method based on the idea that error caused by the difference between incident wave field used in calculation and waves propagating in finite element grids can be eliminated to suppress drift instability. In this method, a calculation scheme is proposed to obtain the numerical solution of incident wave field, which establishes boundary region models with the multi-transmitting boundary. Numerical experiments demonstrate that this improved wave motion input method not only eliminates drift instability but also effectively improves the calculation accuracy of low-frequency components. Furthermore, the method is easy to implement and, unlike other approaches, does not need artificial parameters. Thus, this method is proposed for use in wave scattering simulation such as seismic response analyses of structures, particularly for long-period structures and those that are sensitive to low frequency.

中文翻译：

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一种适用于多传输边界的改进波浪运动输入方法

摘要 针对多传播边界的散射问题，基于可以消除计算中使用的入射波场与波在有限元网格中传播的差异引起的误差，抑制漂移不稳定性的思想，提出了一种改进的波浪运动输入方法。 . 该方法提出了获得入射波场数值解的计算方案，建立了具有多发射边界的边界区域模型。数值实验表明，这种改进的波浪运动输入方法不仅消除了漂移不稳定性，而且有效提高了低频分量的计算精度。此外，该方法易于实现，并且与其他方法不同，不需要人工参数。因此，