If no filter is applied, steep short waves appear at the waterline of a ship – in the vicinity of the fore shoulder – at Froude numbers smaller than about 0.35. These short waves are shown to correspond to the divergent waves created by the ship bow. A practical method for effectively filtering steep short shoulder and midship waves, which are inconsequential and likely unrealistic, is given. This filter has no adverse effect on the wave drag and the hydrodynamic lift and pitch-moment experienced by the ship. Moreover, it is particularly simple as it is explicitly defined in terms of the Froude number and the hull geometry, and can easily be implemented.

中文翻译：

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为什么在船舶吃水线上会出现陡峭的短波，以及如何以实用的方式对其进行过滤？

如果未应用过滤器，则在弗罗德数小于0.35的情况下，在船舶的水线处-前肩附近会出现陡峭的短波。这些短波显示为对应于船首产生的发散波。给出了一种有效的过滤陡峭的短肩波和中浪的实用方法，这是无关紧要的，而且可能是不现实的。该过滤器对船舶的波浪阻力，流体动力升力和俯仰力矩没有不利影响。此外，它特别简单，因为根据弗洛伊德数和船体几何形状进行了明确定义，并且可以轻松实现。