Passive control of floating offshore wind turbine nacelle and spar vibrations by multiple tuned mass dampers

Abstract

This paper investigates the use of single and multiple tuned mass dampers (TMDs) for passive control of edgewise vibrations of nacelle/tower and spar of spar-type floating wind turbines (S-FOWTs). Uncontrolled and controlled mathematical models of the S-FOWT are developed by using Euler-Lagrangian energy formulations. In these models, the aerodynamic properties of the blade, variable mass and stiffness, gravity, the interactions among the blades, nacelle, spar and mooring system, the hydrodynamic effects, the restoring moment, and the buoyancy force are considered. The vibrations of the blades, nacelle, tower, and spar are coupled in all degrees of freedom and in all inertial, dissipative, and elastic components. In the controlled model, several set of horizontal TMDs are placed in the spar at various depths and the coupling of these TMDs with the nacelle and spar motions is considered. The control effectiveness is evaluated by the reduction of the root-meansquare and maximum response. The control feasibility is examined by using the spar sinking and the TMD maximum strokes. The investigations using nonlinear time-domain simulation show that a single TMD can reduce up to 40% of the nacelle sway displacement and the spar roll, and that the reduction observed with multiple TMDs is 50%. The influence of the spar TMD is more significant than that of the nacelle TMD. The spar TMDs are less effective when their positions are lower. In all the cases studied, good heave performance of the S-FOWT is maintained.

Performance enhancement of wind turbine systems with vibration control: A review

“…the multiple mass damping system was connected with the turbine towers [77]. The use of MTMD was also investigated for mitigation of edgewise vibration of tower/nacelle and spar of spartype floating wind turbine [78]. The results showed that this method with passive control approach can reduce the nacelle sway displacement up to 50% compared to TMD which can reduce up to 40%.…”

Active Control of Edgewise Vibrations in Wind Turbine Blades Using Stochastic Disturbance Accommodating Control

“…Murtagh et al [14][15] proposed a passive tuned mass damper(TMD) placed on the top of tower for reduction vibration.Throgh inverse fourier transform get the response of the coupled blades and tower.Lackner and Rotea [16] investigate the parametric study to determine optimal parameters of a passive TMD located in the nacelle of a offshore wind turbines.Dinh [17] investigates the use of single and multiple TMDs for passive control of side-side vibrations of tower.It shown that multiple TMDs can reduce 10% of the nacelle displacement more than single TMD.Tuned liquid column damper(TLCD) is another commonly damper.Colwell and Basu [18] investigate using TLCD for offshore wind turbine under the combination of wind and wave load.Another investigation using single and multiple TLCD has been done by Mensain and Leonardo [19],it is shown that use two TLCD were benefit over single TLCD. For suppressing blade vibration, many types semi-active and active control have been proposed which damper install in side of blades.…”

Passive Control of a Pentapod Offshore Wind Turbine Under Earthquakes by Using Tuned Mass Damper

“…Recently some scholars applied the TMD and MTMD in the research of vibration control of OWTs, e.g. Dinh [11], Stewart [12] and Lackner [13] investigated the behaviour of OWTs under operational loads in consideration of TMD, and summarized the influence of TMD mass, amount and locations. Colwell [14] and Chen [15] validate the effects of TLCD on the OWT response by using numerical and experimental methods, respectively.…”