Design of similarity method for rotor system with squeeze film damper

Abstract

The rotor system’s lifespan is limited as a result of the large amplitude it produces when operating. Consequently, the installation of dampers made of squeeze film is widely adopted in engineering to mitigate rotor system vibrations. Examining the dynamic properties of rotor systems fitted with squeeze film dampers is essential to understanding how these dampers lessen vibrations in rotor systems. However, in reality, rotor systems with squeeze film dampers often have large volumes and complex structures, making it difficult to directly study them. In response to the above issues, this article takes the squeeze film damper test bench as a prototype and constructs an equivalent model through equivalent modeling methods. Furthermore, a distorted model is developed based on the equivalent model. The similarity of vibration response between the deformation model and the prototype, as well as the similarity of vibration reduction effect of the squeeze film damper, was verified through simulation. A test bench with a squeeze film damper is set up, and its vibration response results are compared with those obtained from simulations to confirm their consistency. The findings reveal that the distorted model exhibits high consistency with the prototype in terms of critical speed, vibration response and strain energy. The simulation test predicts that the peak error of the prototype is 6.13% in the absence of oil and 3% in the presence of oil.