scholarly journals Effect of unbalanced magnetic pull and hydraulic seal force on the vibration of large rotor-bearing systems

2014 ◽  
Vol 22 (4) ◽  
pp. 042017
Author(s):  
Z Song ◽  
P Guo ◽  
Y Liu
Keyword(s):  
Unbalanced Magnetic Pull ◽  
Rotor Bearing ◽  
Large Rotor

scholarly journals Simulation of Subcritical Vibrations of a Large Flexible Rotor with Varying Spherical Roller Bearing Clearance and Roundness Profiles

Machines ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 28
Author(s):  
Emil Kurvinen ◽  
Raine Viitala ◽  
Tuhin Choudhury ◽  
Janne Heikkinen ◽  
Jussi Sopanen
Keyword(s):  
Simulation Model ◽  
Roller Bearing ◽  
Major Effect ◽  
Bearing Clearance ◽  
Vibration Excitation ◽  
Resonance Response ◽  
Rolling Element ◽  
Rotor Bearing ◽  
Harmonic Resonance ◽  
Large Rotor

In large rotor-bearing systems, the rolling element bearings act as a considerable source of subcritical vibration excitation. Simulation of such rotor bearing systems contains major sources of uncertainty contributing to the excitation, namely the roundness profile of the bearing inner ring and the clearance of the bearing. In the present study, a simulation approach was prepared to investigate carefully the effect of varying roundness profile and clearance on the subcritical vibration excitation. The FEM-based rotor-bearing system simulation model included a detailed description of the bearings and asymmetricity of the rotor. The simulation results were compared to measured responses for validation. The results suggest that the simulation model was able to capture the response of the rotor within a reasonable accuracy compared to the measured responses. The bearing clearance was observed to have a major effect on the subcritical resonance response amplitudes. In addition, the simulation model confirmed that the resonances of the 3rd and 4th harmonic vibration components in addition to the well-known 2nd harmonic resonance (half-critical resonance) can be significantly high and should thus be taken into account already in the design phase of large subcritical rotors.

Dynamic modeling and vibration response analysis of a synchronous motorized spindle with inclined eccentricity

2021 ◽  
pp. 107754632110233
Author(s):  
Wei Feng ◽  
Kun Zhang ◽  
Baoguo Liu ◽  
Weifang Sun ◽  
Sijie Cai
Keyword(s):  
Analytical Method ◽  
Vibration Response ◽  
Mass Force ◽  
Motorized Spindle ◽  
Dynamic Displacement ◽  
Unbalanced Mass ◽  
Unbalanced Magnetic Pull ◽  
Spindle Bearing ◽  
Mass Eccentricity ◽  
Bearing System

The air-gap eccentricity will produce unbalanced magnetic pull and cause vibrations and noises in a motor. In this study, the dynamic behavior of a synchronous motorized spindle with inclined eccentricity is investigated. A semi-analytical method is proposed to model the unbalanced magnetic pull and the electromagnetic torque of a rotor with inclined eccentricity, and the semi-analytical method is verified by the finite element method. The dynamic model of a spindle-bearing system is built by taking the centrifugal force and gyroscopic effects into account. Then, the vibration response of dynamic displacement eccentricity, inclined eccentricity including displacement eccentricity and angle eccentricity, rotating speed, and unbalanced mass eccentricity in both time domain and frequency domain are simulated and analyzed. The results show that the eccentricities can lead to fluctuations in amplitudes of the dynamic displacement response and the angle response. The frequency components of the dynamic responses are the combination of rotating frequency, VC frequency, and power frequency. It is indicated that the coupling interactions of bearing forces, unbalanced mass force, and unbalanced magnetic pull have an obvious effect on the spindle-bearing system.

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