Vibration damping of an offshore wind turbine by optimally calibrated pendulum absorber with shunted electromagnetic transducer

This paper investigates the use of an augmented pendulum absorber for damping tower vibrations in monopile-supported wind turbines. A shunted electromagnetic transducer is proposed to replace classic viscous dashpot absorbers, order improve performance and durability absorber. series RCL (resistive-capacitative-inductive) network designed as supplemental shunt transducer, which together with intrinsic resistive-inductive properties coil results additional resonance. The system equations motion are established, from closed-form expressions optimal calibration derived using pole-placement. fully-coupled 14-degree-of-freedom aero-hydro-servo-elastic turbine model established evaluate under realistic conditions by non-linear time-domain simulations. Both frequency- show that procedure outperforms dashpot-based respect vibration mitigation.