To incorporate the important effects of the rotor wake, the far-field boundary condition derived from the rotor momentum theory and the cyclic boundary condition have been used.

为了充分考虑旋翼尾迹对流场的影响，采用周期性边界条件和由动量理论导出的远场边界条件。

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The method can simulate not only the radiation damping of semi-infinite soil, but also the elasticity recovery capacity of the far field media on the boundary.

该方法不但可以较好地模拟半无限地基的辐射阻尼，也能模拟远场地球介质的弹性恢复性能。

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Numerical results showed that the proposed boundary could simulate the influence of far field and did not have the problem of low-frequency instability.

数值分析结果显示，该边界可较好地模拟远场介质的作用以及土体的辐射阻尼，具有良好的低频稳定性。

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