Stability Analysis of a Rotor Systems with Flow Forces

Abstract

The vibration that occurs in Turbomachinery modifies parameters in its performance and depending on the application, such performance can compromise the entire system. The vibrations that occur in these cases can be divided depending on the source that exits, it: forced and self-excited, where the self-excited vibration extracts energy from the source, which generates instability and can cause catastrophic failures since it is very difficult to predict these effects during the design of the elements of the turbomachine. There are studies to predict some effects, from energy methods to coupled solutions Fluid-Structure and by using numerical solutions with neural networks that estimate the forces to which the rotor system is subjected, so it is It is important to investigate the effects of these forces on the structural response of the rotor system [5], therefore fluid-structure interaction studies (such as those applied in aircraft structures) are needed for rotodynamic instability. Therefore, this work presents a structural model of a rotor system considering loads due to the flow to obtain the aerodynamic forces and analyse the structural stability of the rotor system, numerical and analytical solutions have been chosen to see the behaviour of the system. The CFD solution is made to obtain the forces due to the flow in the rotor system and later these forces feed the structural model of the same to obtain its response (unbalance) using the finite element method.