Abstract

Different modes of direct and reverse passage of the resonance region of the statically unbalanced rotor equipped with an imperfectly mounted eccentric ABB (Automatic Ball Balancer) are investigated with the help of the mathematical model. It is shown for the mode of a constant angular acceleration that the maximum amplitude during the reverse passage of the critical region is always lower than the maximum amplitude in the steady-state mode; at the same time the amplitude of whirling in the direct passage, on the contrary, may be greater than the maximum steady-state value. The case of rotor passing through the resonance under the action of a constant external torque was also investigated. The effect of viscous friction in the ABB’s cage was studied for both types of modes. The effect of the rapid oscillations of the amplitude caused by the slippage of the balancing balls was discovered in the case of insufficient damping in the ABB