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为了避免机组在运行中发生剧烈的振动,在设计中必须正确地确定转子的临界转速。实践证明,转子支承的动刚度和油膜刚度对转子的临界转速有较大影响。通常,电站汽轮机弹性支承转子的临界转速值较刚性支承转子的临界转速值下降10～30%,个别的甚至下降40%以上,在一般情况下,临界转速的阶次愈高,下降的幅度也愈大。因此,为了正确地计算转子临界转速,必须测定支承动刚度和油膜刚度等数据。本文仅就支承动刚度的测定及其对转子临界转速的影响进行了计算和分析,所得数据可供有关设计部门参考。
In order to avoid violent vibration of the unit during operation, the critical speed of the rotor must be correctly determined in the design. Practice has proved that the dynamic stiffness of the rotor support and the stiffness of the oil film have a greater impact on the critical speed of the rotor. In general, the critical speed of the elastically supported rotor of power station steam turbine is 10 to 30% lower than the critical speed of the rigidly supported rotor, and even more than 40% for some. In general, the higher the critical speed, the lower the magnitude The greater. Therefore, in order to correctly calculate the critical speed of the rotor, the dynamic stiffness of the bearing and the stiffness of the oil film must be determined. In this paper, only the determination of the dynamic stiffness of the bearing and its influence on the critical speed of the rotor are calculated and analyzed. The obtained data are available for reference by the relevant design department.