控制系统的功能是在负载随时变化的工况下，确保机组转速恒定，并使电压输出控制在要求范围之内。
The control system functions to keep speed of the machines substantially constant and the voltage within prescribed limits, even the load may change.
结果表明，在换能器不同振动模态下，等效并联电容电阻并非恒定值，而且实际支承工况下换能器系统工作时存在负阻尼效应。
The result shows, under different vibration mode, equivalent parallel capacitance and resistance are not constant value. There is negative damp effect in transducer system at the operating mode.
在实际的疏浚作业过程中，由于水下土质、河床形态和作业过程的复杂性，严格地讲，疏浚工况是非恒定的。
Because of the complexity in underwater soil, river bed condition and dredging process of a real dredging project, dredging conditions are very often unsteady.
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