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首页> 外文期刊>Journal of Vibration and Acoustics >Instability Boundary for Rotor-Hydrodynamic Bearing Systems, Part 1: Jeffcott Rotor With External Damping
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Instability Boundary for Rotor-Hydrodynamic Bearing Systems, Part 1: Jeffcott Rotor With External Damping

机译：转子-流体动力轴承系统的不稳定性边界，第1部分：具有外部阻尼的Jeffcott转子

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摘要

The instability of rotor-hydrodynamic bearing systems has been a major concern in highspeed rotating machine design. The threshold speed is usually considered to be a barrier that cannot be driven through. However, if some kind of external damping is introduced, the situation may be different. The study is first conducted on the Jeffcott rotor with external damping for both vertical and horizontal configurations. For the vertical system, it has been shown by both analytical and numerical study that there is a threshold speed at which the rotor will get into an upper stable region from the previous unstable region. For the horizontal system, an extended Lund Stability Method is presented which proves that the system may have two threshold speeds. This results in a stability pattern which has one region of instability sandwiched between two regions of stability. Then, the study is expanded to the extended Jeffcott rotor. With the introduction of equivalent journal mass, another threshold speed appears which forms a top and final boundary to the stable operation of the rotor. The results of a numerical study show that with the external damping increased, the first several unstable regions can be reduced or eradicated. The external damping has little effect on the last top threshold which is mainly dependent on the value of journal mass. It has also been shown that a certain value of external damping and small journal mass would be very beneficial to improve the stability characteristics of the system over the entire speed range.
机译：转子流体动力轴承系统的不稳定性一直是高速旋转机器设计中的主要问题。阈值速度通常被认为是无法突破的障碍。但是，如果引入某种外部阻尼，情况可能会有所不同。该研究首先在具有垂直和水平配置的外部阻尼的Jeffcott转子上进行。对于垂直系统，分析和数值研究均表明，存在一个阈值速度，在该速度下，转子将从先前的不稳定区域进入上稳定区域。对于水平系统，提出了扩展的隆德稳定性方法，证明了该系统可能具有两个阈值速度。这导致具有一个不稳定区域的稳定模式，该不稳定区域夹在两个稳定区域之间。然后，研究扩展到扩展的Jeffcott转子。随着等效轴颈质量的引入，出现了另一个阈值速度，该阈值速度形成了转子稳定运行的顶部和最终边界。数值研究结果表明，随着外部阻尼的增加，前几个不稳定区域可以减小或消除。外部阻尼对最后一个最高阈值影响很小，后者主要取决于轴颈质量值。还显示出一定的外部阻尼和较小的轴颈质量值将非常有利于在整个速度范围内改善系统的稳定性。

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