Optimal calibration of the rotational inertia double tuned mass damper (RIDTMD) for rotating wind turbine blades

This paper presents the closed-form formulas for optimal calibration (tuning) of the rotational inertia double tuned mass damper (RIDTMD) for damping edgewise vibrations in rotating wind turbine blades. A 3-DOF model is first established for the rotating blade-RIDTMD system, based on which the optimal calibration formulas are derived by means of pole-placement method. Equal modal damping criterion is applied together with the utilization of the triple-root bifurcation point. It is seen from the derived closed-form formulas that the optimal damper parameters depend explicitly on the rotor rotational speed. Comparison of the optimal RIDTMD and the optimal TMD is performed using the NREL 5 MW wind turbine as the numerical example. Results indicate superior performance of the RIDTMD in damping blade vibrations comparing with the TMD, at the cost of slightly increased damper stroke. (C) 2020 Elsevier Ltd. All rights reserved.

Automated summary

This paper presents closed-form formulas for optimal calibration of the rotational inertia double tuned mass damper (RIDTMD) for damping edgewise vibrations in rotating wind turbine blades, by establishing a 3-DOF model and using the pole-placement method. The results show that RIDTMD performs better than TMD in damping blade vibrations, but with a slightly increased damper stroke.