自激振荡

例句：

1. 1. The circuit has a self-excited oscillation at the frequency of 500 Hz.
   电路在500赫兹的频率下产生自激振荡。
2. 2. The engine's vibration is due to its self-excited oscillation.
   发动机的振动是由于其自激振荡引起的。
3. 3. The system requires careful design to avoid self-excited oscillations.
   该系统需要仔细设计以避免自激振荡。