By increasing the inertia of riser in the core outlet, the compressible density wave oscillation can be suppressed effectively and the system stability can be enhanced.

加大堆芯出口水力提升段的质量惯性能有效地抑制可压缩性密度波振荡，提高系统的稳定性。

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The average effective pitch damping increases with increasing Angle of oscillation amplitude and decreases with increasing Mach number.

角振幅增大会使返回舱的平均俯仰阻尼增加，马赫数增大使俯仰阻尼降低。

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But with the increasing of the order of interpolation polynomials, serious oscillation phenomena will appear, which will increase the computational error and affect instabilities of computations.

但是，随着插值多项式次数的提高，计算误差会增大，出现龙格现象和不稳定。

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