MD对海上浮动基风力机振动抑制的优化设计

In order to suppress the responses of the large vibration displacements and loads of the offshore floating wind turbine under the harsh marine environment, an effect method for restraining vibration, putting tuned mass dampers (TMD) in the cabin of wind turbine, is proposed in this paper. A dynamics model for offshore floating wind turbine with a fore-aft TMD is established based on Lagrange equation; Parameters identification of the wind turbine is performed by the non-linear least squares Levenberg-Marquardt (LM) algorithm; Parameters optimization of the TMD is researched when considering the standard deviation of the tower top longitudinal displacements as the objective function. Aiming at five typical combined wind and wave load cases under normal running state of the wind turbine, the dynamic responses of the wind turbine with/without TMD are simulated and the suppression effect of the TMD is investigated. The results show that: There exists the optimum TMD mass ratio 1.8% when the damped free vibration of the wind turbine, and the standard deviation of the tower top longitudinal displacements is decreased 60% in 100 seconds by the optimized TMD. The suppression rates of the standard deviation of the longitudinal displacements and loads about the tower and blades increase with the increase of the TMD mass ratio when the wind turbine vibration under the combined wind and wave load cases, and when the mass ratio variates from 0.5% to 2%, the maximum suppression rates by 20% to 50%, which effectively reduce the vibration responses of the wind turbine. The research results of this paper preliminarily verifies the feasibilities of using TMD for restraining vibration of the offfshore floating wind turbine.