Abstract
This paper explores the new control strategy of an actively actuated eccentric mass system (AAEMS) for cancelling the rotor imbalance vibration. The AAEMS consists of an eccentric mass with an actuator that actively moves around the circular guided track attached to the rotating rotor thus can generate an effective centrifugal force perpendicular to any tangential direction of the guided circular trajectory. Therefore, once the magnitude and angular position of the inherited static imbalance of the rotor are identified, this actively controlled system can be dispatched to the target angular position(s) where the effective centrifugal force due to rotor imbalance is completely or partially removed. This novel device is currently available and widely used in the vibration isolation problem. However, the study of its control strategy is quite limited, thus, herein, we proposed a new possible control technique, guaranteeing both the robust vibration isolation performance and less control power consumption. To meet such needs, three primary functions of AAEMS are addressed here. First, two (Extended) Kalman filters were employed to sequentially estimate the unknown imbalance of the rotor and the unknown coulomb friction induced between the contact surface of the circular track and the counter-contacted parts of AAEMS. Second, the position control of the AAEMS is achieved by a linear quadratic regulator (LQR)-based optimal control law, simultaneously minimizing the imbalance vibration of the rotor as well as the power consumption of its own actuator. Third, for the situation where the estimation and control errors are presented, thus causing the failure to an acceptable threshold for imbalance vibration, the trial-error-based fine-tuning angular position control was proposed. The effectiveness of the proposed control strategy was evaluated via the simulations and this study shows the practical potential for addressing the AAEMS-based imbalance vibration elimination.
Highlights
The imbalance vibration control in the rotor system is a significant concern for ensuring the efficient and reliable operation of many mechanical systems containing rotating rotor(s)
actuated eccentric mass system (AAEMS) system system for for imbalance imbalance vibration vibration control, control, the the simulations were conducted
This paper proposed a new control strategy for a novel AAEMS for cancelling the rotor imbalance
Summary
The imbalance vibration control in the rotor system is a significant concern for ensuring the efficient and reliable operation of many mechanical systems containing rotating rotor(s). Using the sudden variation of rotor speed, this approach enforces the balancer ball(s) to be pushed into more desirable angular position(s) (i.e., re-positioning) which revokes the motion of the balancer ball initially situated in the undesirable fixed equilibrium position for the angular phase of the imbalance at the wanted rotor speed due to the friction acting on the contact surface between the ABD racing track and the ABD ball This strategy can be applied for eliminating unstable limit cycles. Reference [23] proposed the new hybrid observer-based rotor imbalance vibration control, incorporating both passive ABD and AMB for destabilizing the undesirable limit cycle condition and repositioning balancer balls.
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