In the case of wind-induced motion, the periodic driving force comes from an effect called vortex shedding.

在风引起的运动中，周期性驱动力来自称为涡旋脱落的效应。

You've probably heard of resonance which is where a periodic force syncs up with the natural frequency of a system.

您可能听说过共振，即周期性力与系统的固有频率同步。