undamped forced vibration

例句：

1. 1. Thestructure's response to the force was an undamped forced vibration.
   该结构对力的响应是未衰减的强迫振动。
2. 2.In the absence of damping, the system exhibits undamped forced vibrations.
   在没有阻尼的情况下，系统表现出未衰减的强迫振动。
3. 3.The engineer used a special material to reduce the undamped forced vibrations in the building.
   工程师使用了一种特殊的材料来减少建筑物中的未衰减强迫振动。