极大多数的情况下应用电动振动台，因为它能在一定广的频率范围内工作并且能准确地控制波形。
Electrodynamic shakers are used in most cases because they can operate over a broad frequency range with accurately controlled waveform.
提出了热工专业中特殊的变参数控制系统的定参数频率设计法，应用计算机进行了仿真计算并进行了实际系统的测试。
A design procedure with constant parameter frequency method is developed for the temperature control system with variable parameter applicable especially to thermodynamics.
在一定控制脉冲频率下，步进电动机可能出现振荡与失步现象，严重影响步进电动机的运行，要严格防止这种情况发生。
When stepping motor works in some pulse frequency, it may have the problem of oscillation and miss of synchronization, so it should be avoided at full steam.
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