Unbalance Vibration Reduction of High-Speed Turbochargers Using Active Magnetic Actuator

Abstract

AbstractRotor faults such as rotor unbalance, shaft cracks, coupling misalignment, etc., cause high vibration in rotating machinery and lead to fatigue failures. Amongst the variety of faults, the unbalanced rotor represents a serious problem and a key source of noise and important vibration in rotating machinery, e.g., the turbochargers, machine tools, ship, and aircraft turbine rotors. Due to the industrial requirements of high-speed rotating machines such as turbochargers, the current trend is to use active magnetic actuators (AMA), which employ a controllable electromagnetic force to control the rotating machines to reduce the unbalance vibration for safe and efficient operation. In this study, we introduce the AMA to the turbocharger-shaft system for reducing the rotating unbalance vibration due to the unbalance forces. The obtained outcomes through the adoption of the linearized expression of electromagnetic force and the presented example therein reveal a significant reduction of the amplitude unbalance response. Additionally, the stability limit speed (SLS) of the turbocharger-shaft system is increased by using the active vibration control. Therefore, the active vibration control represents an effective method for reducing the unbalanced vibrations and improving the stability limit speed of the turbocharger-shaft system, which leads to reliable operation at high-speed machining.KeywordsResidual unbalanceActive vibration controlActive magnetic actuatorHigh-speed turbocharger-bearings