THE PLANAR VIBRATIONS OF THE ROTATING GAS TURBINE ENGINE ROTORS ON THE ANISOTROPIC ELASTIC SUPPORT BEARINGS

Yu.B. Nazarenko

In this article the analysis of the planar vibrations of the rotating rotors on the anisotropic elastic support bearings is presented. During the rotor rotation on the anisotropic elastic support bearings the harmonic loads are brought about; these harmonic loads influence the shaft and the rotor discs with a frequency equal to a duplicated frequency of the rotor rotation and excite the rotor oscillations. The analysis of the equation of the dynamic balance of the rotating rotor on the anisotropic elastic support bearings in the process of rotor’s planar vibrations gave the opportunity to create a method of estimating the value of critical revolution frequency of the rotors, based on elaboration of the equivalent model, which provides a means of rotor’s self-resonant frequency calculation with a simple procedure using Finite element analysis (FEA).

Key words: rotor, bearing shaft, roller bearing, critical revolution frequency of the rotor, planar vibrations, self-resonant frequency, anisotropic elastic support bearings, rotor imbalance, harmonic loads, regular precession, synchronous precession.