The paper determines the rational range of a new spiral rotary drum's rotation speed through theoretically analyzing the critical speed of the drum in a coal machine.
通过对采煤机新型变升角螺旋滚筒极限转速的理论分析，确定了该种新型螺旋滚筒转速的合理范围。
Thought that the generator rotational speed had achieved nearby two time of critical rotation speeds, the shafting has had the oil film vibration.
认为发电机转速达到两倍临界转速附近，轴系发生了油膜振荡。
Thought that the generator rotational speed had achieved nearby two time of critical rotation speeds, the shafting has had the oil film vibration.
认为发电机转速达到两倍临界转速附近，轴系发生了油膜振荡。
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