Dynamic Modelling of a Squeeze Film Damper Oil Film PressureMeasurement System

摘要

To study the dynamic behaviours of the squeeze film dampers, it is vital to know the oil filmpressures in the dampers. Considering the outer race length restriction, a system consisting ofcapillaries and mass-springs at the other large piston ends is proposed to measure the pressures. Byrelating the mass of the liquid in the capillaries as an additional mass to the piston mass at the end,a much simplified model of a mass-(viscous)damping-stiffness system for the measurement deviceis established, and a new approach on indirect measurement of oil film pressure is provided. Whenviscous liquid in the capillaries is under lamina flow state, the pressures in the squeeze oil filmdamper can conveniently be obtained by measuring the motions of mass block only. However,preliminary qualitative analysis shows that the system resonance, which is the functions of themass, damping and stiffness involved, should be avoided.