Gas turbine impellers free vibration study using the fem analysis

Abstract

In this paper the problem of gas turbine rotor impellers free vibration has been studied. For its solution, the new, more correct mathematical model on the base of the nonlinear FEM has been designed. All calculations have been held for the two types of boundary conditions (C – C and C –S) that match the most common types of the turbine rotors assembling. By the usage of the designed mathematical model several rotor impellers free vibration modes and frequencies have been calculated. The developed mathematical model adequacy has been verified by the comparison of calculated results with the experimental data.