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一种特殊类型的不稳定性被称为调制解调器跳变，它是频率空间中的双稳定性。这里的轨迹可以在两个稳定极限环之间发射，因此当在庞加莱截面内测量时，显示出与正常双稳态相似的特性。

一种特殊类型的不稳定性被称为调制解调器跳变，它是频率空间中的双稳定性。这里的轨迹可以在两个稳定极限环之间发射，因此当在庞加莱截面内测量时，显示出与正常双稳态相似的特性。

== In mechanical systems ==

== 机械系统 ==

Bistability as applied in the design of mechanical systems is more commonly said to be "over centre"—that is, work is done on the system to move it just past the peak, at which point the mechanism goes "over centre" to its secondary stable position. The result is a toggle-type action- work applied to the system below a threshold sufficient to send it 'over center' results in no change to the mechanism's state.

Bistability as applied in the design of mechanical systems is more commonly said to be "over centre"—that is, work is done on the system to move it just past the peak, at which point the mechanism goes "over centre" to its secondary stable position. The result is a toggle-type action- work applied to the system below a threshold sufficient to send it 'over center' results in no change to the mechanism's state.