Study on Ultra-High-Stability of Herringbone-Grooved Aerodynamic Journal Bearings with Nonlinear Viscoelastic Elements

本研究对支承轴承的粘弹性元件进行了优化，提出了一种即使在超高速旋转区域也能支撑转轴而不发生涡动失稳的人字形槽动压气体动压滑动轴承。在本研究中，采用O形环作为粘弹性单元。本研究首先确定了不同材料、温度和变形率下轴承支承下O形圈的刚度和阻尼系数。其次，用经验公式表示结果，并对其非线性进行了数学评估。随后，利用该经验公式预测了轴承系统的稳定阈值，并与实验结果进行了比较。最后，参照经验公式，明确了提高支承系统稳定门槛的设计准则。

This study optimized the viscoelastic elements supporting a bearing and proposed the herringbone-grooved aerodynamic journal bearing that can support a rotating shaft without whirl instability even at ultra-high-speed rotational region. In this study, O-rings were used as the viscoelastic elements. This study, first of all, identified the stiffness and the damping coefficients of O-rings under bearing supporting for different materials, temperatures and deformation ratios. Next, the results were formulated by the empirical formula and their nonlinearities were mathematically evaluated. Subsequently, the stability threshold of the bearing system is predicted using the empirical formula and compared with the experimental results. Finally, the design guilds for increasing the stability threshold of the bearing system were clarified by reference to the empirical formula.