Hybrid Control Procedures in Mitigating Cable Vibrations

Cable vibration control is an active research field in the technical literature. Yet, a robust and effective control strategy for cable dynamics is still missing. Indeed, cables exhibit a complex behavior, mainly due to internal resonances and nonlinear couplings. Moreover, most of the control solutions already known in the literature are affected by damper/actuator localization, which significantly impairs their overall control effectiveness. To overcome these drawbacks, the authors have recently proposed a hybrid solution combining wrapped shape memory alloy(SMA) wires and an open-loop actuation. These control solutions have shown promising vibration mitigation capabilities when the motion was essentially dominated by the first in-plane mode. Here, a particular attention is posed to controlling the second in-plane modal amplitude which is known to entail serious control difficulties and proved to be considerably relevant in technical situations. To this end, the effectiveness of the passive(SMA wires), open-loop active and hybrid control solutions are investigated by means of a campaign of laboratory tests. The results extend the previous theoretical/experimental study and confirm the potentialities of the proposed hybrid approach