It is suggested that lowfrequencyfluctuation occurs with cavitation inception in water hydraulic pump.
提出了在纯水液压泵中气蚀初生伴随着低频压力脉动现象。
2
The traditional direct torque control system has existed large torque fluctuation, poor performance of low speed region, inconstant switch frequency, etc.
传统的直接转矩控制存在着转矩脉动大，低速性能差、开关频率不固定等问题。
3
The single cylinder misfire can be also done by the frequency spectrum analysis of rotating speed fluctuation at both low and high speeds, but it can not be determined which cylinder is misfired.