Very often when mechanical operation applied to piped flowing fluid, a state transform will occur as a result inducing a hydraulic transient, or even waterhammer when situation is severe.

• 在管道有压流动的过程中，由于控制系统的操作，导致流体运动状态发生突变，诱发出水力暂态过程，严重时产生称作水锤的极端水力现象。