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

对支承轴承的粘弹性元件进行了优化，提出了在超高速旋转区域也能支承转轴而不产生旋流失稳的人字槽气动滑动轴承。本研究采用o形环作为粘弹性元件。本研究首先确定了不同材料、不同温度、不同变形比下轴承支承下o形圈的刚度和阻尼系数。其次，用经验公式表示了结果，并对其非线性进行了数学评价。随后，利用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，借鉴经验公式，明确了提高轴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.