大多数是晶体振荡器，它利用(石英)晶体固有共振的优点，所以频率稳定。

Most are crystal oscillators that take advantage of the inherent resonance of a (quartz) crystal to obtain frequency stability.

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因为当啮合频率接近于齿轮系的固有频率时容易发生共振。

Because when the frequency of close to the meshing of gears susceptible to the natural resonance frequency.

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并且当漩涡脱落频率与杆件的固有频率接近时，杆件会产生漩涡脱落共振或称涡激共振。

Besides, in case the vortex shedding frequency is equal to a vibration frequency of structure, the rod will occur the vortex shedding resonance or called vortex resonance.

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