以径向浮环动静压轴承为研究对象，针对轴颈和浮环建立了统一的动力学方程，用Routh-Hurwitz准则推导了径向浮环轴承的稳定性判据。用有限元法计算了某结构高速径向浮环动静压轴承的刚度系数和阻尼系数，在此基础上得到了不同偏心率下的失稳转速。由计算结果可以看出，浮环轴承具有极佳的稳定性，且随着偏心率的增加，失稳转速迅速提高。文章在高速浮环轴承稳定性整体建模和分析方面有较大的参考意义。

The unitized dynamics model of journal and floating ring for the journal floating ring hydrostatic/hydrodynamic bearing was established. The stability criterion of the journal floating ring bearing was obtained using Routh-Hurwitz method. The stiffness and damping coefficients under different rotational speed and eccentricity for a high speed floating ring bearing were calculated with finite element method. On this base the variation of threshold speed with eccentricity was acquired. The results show that floating ring bearing has excellent stability and the threshold speed increased quickly with the eccentricity increment. The research fruits have great value in the model integrality and stability analyse of journal floating hybrid bearing.