natural frequency of oscillation of a synchronous machine

例句：

1. 1. Thenatural frequency of the system is determined byits mass and stiffness.
   系统的自然频率由其质量和刚度决定。
2. 2. In amechanical system, the natural frequency is thefrequency at which the system will oscillate without external force.
   在机械系统中，自然频率是系统在没有外力作用时将发生振动的频率。
3. 3. Thenatural frequency of an oscillator is the frequency atwhich it produces maximum vibration.
   振荡器的自然频率是它产生最大振动的频率。