Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
DYNAMIC ANALYSIS OF ROTATING SYSTEMS WITH VIBRATION ABSORBERS
Submission Author:
João Henrique dos Santos de Pontes , SP , Brazil
Co-Authors:
João Henrique dos Santos de Pontes, Tiago Machado, Gregory Bregion Daniel
Presenter: João Henrique dos Santos de Pontes
doi://10.26678/ABCM.COBEM2021.COB2021-0820
Abstract
In this work several concepts of vibration absorbers were studied and modelled by Finite Element Method from the commercial software Ansys. Then modal analysis were performed in order to obtain the natural frequencies of these concepts. The geometry of promising concepts was modified to match the absorber natural frequencies with the critical speeds of the rotor. Absorbers were then assembled in the rotor to simulate amplitude levels by unbalance response in the frequency domain, comparing the cases with and without absorber on the rotating shaft. These results were also compared to a case in which the absorber was replaced by its concentrated mass and inertia to ensure that the effect on the original system is due to the absorber dynamic behavior and not caused by the change in the system overall parameters. Results show a promising capacity of amplitude reduction, but with narrow band-gap for some cases. Both the change in position and increase of overall size and mass of the absorber are capable of broadening the band gap but must be analyzed carefully in order to enable its use in real machine due to spatial constraints and change of system characteristics.
Keywords
Rotordynamics, vibration absorber, Dynamic effects
