However, in the case of non-zero attack angle, the flat box deck becomes bluff, the variation of its flutter critical wind speed is accordingly undulant as the wind yaw angle increases, and the lowest value will occur generally under skew wind.

• 而对于非0°风攻角的情况，扁平箱形断面的流线性变差，随着风偏角的增加其颤振临界风速呈起伏变化，最低值一般在斜风的情况下出现，此时，传统的平均风分解方法不再适用。