点头频率特征是通过跟踪头部运动获得的。

Nodding frequency is obtained by tracking head movements.

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本文选取了多种视觉特征作为疲劳估计特征，包括眼睛闭合程度、眨眼频率、打哈欠频率和点头频率。

This paper selects a variety of visual features as the fatigue characteristics, including Perclos, blinking frequency, yawning frequency and nodding frequency.

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因此，需合理选取牵引电机吊挂关节的刚度，避免基于电机点头振动固有频率及各结构部件固有频率的振动。

Therefore, it needs to select the motor hanging rubber stiffness reasonably to avoid resonances of the structure of the driving gear.

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