流体惯性对弹性环式挤压油膜阻尼器-转子系统动力特性的影响

基于考虑流体惯性的雷诺方程，利用有限差分法计算弹性环式挤压油膜阻尼器(ERSFD)的内、外油膜分布压力和油膜合力，分析ERSFD-转子系统动力学。通过比较考虑流体惯性和不考虑流体惯性时的油膜压力、油膜合力和转子幅频响应，发现当雷诺数较大时，计算结果存在明显差异。考虑流体惯性的转子系统等效刚度和阻尼均更大，临界转速更大，而共振区振幅则更小。当转子系统的转速较大，或油膜黏度较小从而雷诺数较大时，在油膜力计算中考虑流体惯性的影响是必要的。 

Influence of fluid inertia on dynamic characteristics of elastic ring squeeze film damper-rotor system

The inner and outer oil film distribution pressure and resultant force of elastic ring squeeze film dampers(ERSFD) were calculated through the generalized Reynolds equation with the effect of fluid inertia by finite difference method, and used to analyze the dynamic of ERSFD-rotor system. Comparing oil film pressure, oil film resulant force and the rotor amplitude-frequency of the rotor systems with/without fluid inertia, it was found that when the Reynolds number was large, there was significant difference between them. The equivalent stiffness and damping were larger, the critical speed was bigger and the amplitude was smaller in the resonance zone when the fluid inertia was calculated. When the rotor speed is bigger or the viscosity is smaller and the Reynolds number is larger, it is necessary to consider the effect of fluid inertia in calculation of oil film force.