To speed up the calculation of dynamic analysis for elastic ring squeeze film dampers (ERSFDs) and investigate the dynamic characteristics of ERSFD-rotor systems, a semi-analytic method (SAM) is proposed for analyzing oil film pressure and force. This method is subsequently verified by comparison with numerical simulation and experimental results. Based on this SAM, an improved dynamic model of an ERSFD-supported rotor is developed by coupling the kinetic equations of the rotor with the determination of elastic deformation. Using this method, the oil coefficients and vibration behaviors of the rotor such as the amplitude–frequency relation and the influence of sudden excitation are investigated. The results reveal that the equivalent oil coefficients and damping ratio of the system can be increased significantly by the adoption of ERSFDs. Therefore, the nonlinear bi-stable response occasionally occurring in traditional squeeze film damper (SFD) supported rotors is effectively suppressed and the transient vibration process caused by sudden unbalanced excitation action is significantly shortened. The SAM enables one to reduce the computation time of the previous method by more than 90%. Such a reduction greatly improves the computational efficiency.

为了加快弹性环挤压膜阻尼器（ERSFD）动力学分析的计算并研究ERSFD转子系统的动力学特性，提出了一种半解析方法（SAM）分析油膜压力和力。随后通过与数值模拟和实验结果进行比较来验证该方法。基于此SAM，通过将转子的动力学方程与弹性变形的确定联系起来，开发了一种改进的ERSFD转子模型。使用这种方法，研究了转子的油系数和振动行为，例如振幅-频率关系以及突然激振的影响。结果表明，采用ERSFD可以显着提高系统的等效油系数和阻尼比。因此，有效地抑制了在传统的挤压式减振器（SFD）支承的转子中偶发的非线性双稳态响应，并且显着缩短了由突然的不平衡激励作用引起的瞬态振动过程。SAM使人们能够将前一种方法的计算时间减少90％以上。这种减少极大地提高了计算效率。