一个或几个万向节来适应传动角度的变化；一套伸缩花键，能够改变传动轴的现有长度。

There must be one or more universal joints to permit variations in the Angle of drive. there must also be a slip joint that permits the effective length of the propeller shaft to change.

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本文提出了一个变步长自适应窗算法，并给出了该算法的原理和如何改变窗口的大小和长度方法的步骤。

A variable step size adaptive window algorithm is proposed in the paper. Give the principle of the proposed algorithm and the way how to vary the step size and window length.

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