Zimmerman found that the pulsing field produced by the hands of practitioners is not steady in frequency, but varies from moment to moment.
齐默曼发现脉冲实地从业者手的频率并不稳定，但是从目前的时刻变化。
The frequency changing start up process of generating unit actually is a synchronous driving process under the action of electromagnetic moment of the stator and rotor of motor.
机组变频起动过程，实际上是电动机依靠定子和转子的电磁力矩作用的同步驱动过程。
The transfer of shearing and moment must be considered in dynamic analysis because the model of dowel bar affects the modal frequency and modal shape directly.
指出传力杆模型对模态频率和主振型有直接影响，动力分析中应当考虑接缝的剪力传递和弯矩传递。
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