带有挤压油膜阻尼器的转子系统动力学相似设计

In order to research the dynamic similarity problems of rotors with squeeze film damper (SFD)，which are common in aero-engines，a similar modeling method was established. Starting from the vibration differential equation of the rotor with damping，the similar relationship between the unbalanced force and the damping force in the rotor vibration process was derived by equation analysis method. Based on the oil film force and oil film equation of the squeeze film damper， the mathematical relationship between the parameters of the squeeze film damper and the similar parameters of the rotor was established，and the corresponding engineering design method was given. Taking a single-rotor system of the rotor as an example， a similar rotor system with a squeeze film damper was established. The dynamic characteristics of the rotor system and its similar systems were analyzed using the finite element method. The analysis results showed that the unbalance response error between the similar system and the original rotor system was lower than 1% when only considering the damping of squeeze film damper in the rotor system.