Torsional vibration is an important issue in many industrial applications with rotating mechanical components. Excessive torsional vibrations may result in noise, excessive stresses or even fatigue failure if not controlled expeditiously. The present research aims at developing a novel hybrid semi-active torsional vibration damper incorporating a conventional Centrifugal Pendulum Vibration Absorber (CPVA) and a Magnetorheological (MR) damper capable of suppressing torsional vibration under varying excitation frequencies. Two different strategies were carried out for controlling damping torque of the MR damper. First, the passive control approach of the MR damper is implemented in two cases, 1) When the applied current is set to zero, 2) When it is set to a constant value. The system response is investigated at resonance condition, when the excitation frequency coincides with the natural frequency of the system and torsional vibration response of the system is illustrated in each case. In the second approach, the semi-active Skyhook control algorithm with variable applied current is implemented for improving the performance of the hybrid damper. Torsional response of the system is illustrated in each case and compared with one another.
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