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

本研究针对轴承粘弹性支撑元件进行优化设计，提出一种人字形槽动压轴承，该轴承即使在超高速旋转区域也能支撑旋转轴而不产生涡动失稳。在这项研究中，O型环被用作粘弹性元件。本研究首先辨识出不同材质、温度及变形率下O形圈在轴承支撑下的刚度与阻尼系数。然后，用经验公式对结果进行公式化，并对它们的非线性进行数学评价。最后，利用经验公式对轴承系统的稳定阈值进行了预测，并与实验结果进行了比较。最后，结合经验公式，阐明了提高支承系统稳定阈值的设计准则。

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.