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.