Effects of a Vibration Mass Damper in a Wind Turbine Tower
Titel:
Effects of a Vibration Mass Damper in a Wind Turbine Tower
Auteur:
Enevoldsen, I. Mørk, K. J.
Verschenen in:
Mechanics based design of structures & machines
Paginering:
Jaargang 24 (1996) nr. 2 pagina's 155-187
Jaar:
1996
Inhoud:
The problem of reducing the dynamic response, and thus the fatigue load, on a wind turbine tower is treated by introducing a mass damper. Investigations are performed using structural optimization on equivalent conditions with and without the damper. Overall effects are analyzed and valuable information is obtained through sensitivity analysis of the optimal designs. The majority of the paper concerns response modeling of the rotor and turbine tower. The load from the rotor is obtained as a deterministic rotor load, determined as the sum of aerodynamic forces from the static wind field, gravity, and centrifugal forces, and a stochastic rotor load from a randomly fluctuating wind turbulence component. Response analysis of the turbine tower under operational and extreme conditions is outlined and damping contributions, including the mass damper, are described. Response modeling and structural optimization are performed on-a VESTAS V39 40 m high 500 kW pitch regulated three-blade horizontal wind turbine. The effect of the mass damper on the response and a sensitivity analysis are presented. It is concluded that the introduction of the mass damper may result in somewhat more economic designs with significantly increased confidence over traditional designs.
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