负荷相同时，转速波动率的大小与转速没有单调变化关系。
However, when the load is same, the fluctuation ratio is independent to the mean engine speed.
若调节稳压螺杆的转速，则可完全补偿主螺杆压力和产率的波动。
If the screw speed of parallel pressure stabilization apparatus is varied corresponding to the pressure fluctuation, the pressure and output fluctuation of extrusion can be fully compensated.
研究结果表明：扭矩波动、转速波动、HC排放值和HC升高率都受空燃比的影响，并且它们的变化趋势具有较好的一致性；
Test results show that fluctuation of torque output and engine speed, HC emission and its rise ratio are all affected by excess air ratio.
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