# An automatic dynamic balancer in a rotating mechanism with time-varying angular velocity

## TL;DR

This paper analyzes the dynamics of an automatic dynamic balancer on a rotating disc with variable angular velocity, highlighting when rotor acceleration must be considered for accurate modeling and exploring nonmonotonic velocity variations.

## Contribution

It compares constant and variable angular velocity scenarios, identifying conditions where rotor acceleration impacts system dynamics and discussing strategies to maximize stability basins.

## Key findings

- Acceleration phase affects system dynamics in certain cases
- Ignoring acceleration can lead to inaccurate predictions
- Nonmonotonic velocity variations can enhance stability

## Abstract

We consider the system of a two ball automatic dynamic balancer attached to a rotating disc with nonconstant angular velocity. We directly compare the scenario of constant angular velocity with that when the acceleration of the rotor is taken into consideration. In doing so we show that there are cases where one must take the acceleration phase into consideration to obtain an accurate picture of the dynamics. Similarly we identify cases where the acceleration phase of the disc may be ignored. Finally, we briefly consider nonmonotonic variations of the angular velocity, with a view of maximising the basin of attraction of the desired solution, corresponding to damped vibrations.