Numerical Modeling of a Vibration Test Platform with Imbalance CILAMCE-2023

Resumo

The study of vibrations caused by imbalances is crucial in industry and engineering, as imbalance can
cause vibrations and material fatigue. Motors exhibit vibrations due to imbalance, which can be caused by
imperfections in manufacturing, design flaws and maintenance. This study analyzes the vibratory behavior of a
sliding bearing on a rotating shaft with rotary imbalance through Finite Element simulations. The numerical results
were compared to experimental results obtained on a bench using an accelerometer. The analyses were performed
using MATLAB and Ansys software. The study aims to contribute to the understanding of vibrations in rotating
systems and the development of prevention and correction techniques for imbalance. The comparison between
experimental and numerical results enabled the calibration of the model in terms of its boundary conditions,
particularly with regard to the supports of the piece. Initially, it was believed that a perfect fixed support would be
sufficient, but the numerical results showed discrepancies in relation to the experimental results. Therefore, the
system was modeled with the introduction of an elastic support, and through manual adjustments in stiffness, it
was possible to obtain good correspondence between the numerical and experimental results, adapting the model
of the bearing to its real counterpart.