Along-wind response of a wind turbine tower with blade coupling subjected to rotationally sampled wind loading

Semi-active frequency tracking algorithm for control of flapwise vibrations in wind turbine blades

“…Employing the Frobenius method of series solution of differential equations as in ref (10) and considering ideal clamped-free boundary conditions for a cantilever, the natural frequency equation is obtained to be (5) and t he normalised modeshape equation can be derived as…”

Fragility analysis of steel and concrete wind turbine towers

“…As long as the blade model captured the general characteristics of the dynamics and could be ap plied to both the steel and concrete towers in an equal fashion, then any further model complexity was not required. Previous studies considering wind turbine dynamics have also seen this as an appropriate consideration (Staino et ai, 2012;Arrigan et ai, 2011;Colw'ell and Basu, 2009;M urtagh et al, 2005b). Many of these studies even focussed primarily on blade dynamics.…”

“…While the approaches discussed above relate to commercial wind turbine modelling solu tions, many authors have chosen to employ elements of these models, often greatly simpli fied, in order to address a specific aspect of wind turbine dynamic response (Staino et ai, 2012;Pedersen et ai, 2012;Arrigan et ai, 2011;Colwell and Basu, 2009;Duenas Osorio and Basu, 2008;Wang et ai, 2010;M urtagh et al, 2005b;Hansen, 2003). This allows execution times to be considerably reduced and provides greater focus on the particular elements under consideration.…”

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.…”