DYNAMIC MODELLING AND ANALYSIS OF SHAFT WITH ROTOR SUPPORTED ON BALL BEARING HAVING SQUEEZE FILM DAMPER

Abstract

The dynamics of turbo machinery depends upon the behaviour of the rotor, which is strongly affected by the rotor’s supports. The bearings supporting the rotor generally have very less damping, which can sometimes leads to very large vibration amplitude of rotor when it is operated near its operating range. Squeeze film damper is one of the most widely used tools to provide an additional external damping for rotating equipments. So, to reduce the vibration amplitude of rotor squeeze film damper can be used. Presently, this work is dedicated to analyse the dynamic behaviour of shaft with rotor supported on ball bearing having squeeze film damper with the help of bond graph technique. First, physical and mathematical model of various element of rig such as squeeze film damper having centralizing spring, rigid rotor on shaft and bearing support has been prepared. The bond graph modelling of shaft, spinning hub, squeeze film damper is done using symbol sonata software bond pad. Simulation of this model has been carried out on Symbols sonata software which uses the fourth order Runge-Kutta method. The variation in the position of centre mass of rotor with change in various parameters such as speed, clearance, viscosity of oil and stiffness of centralizing spring is observed. The data obtained is used to get plots .