000004592 001__ 4592
000004592 005__ 20141118192709.0
000004592 0177_ $$2doi$$a10.3850/978-981-07-2219-7_P403

000004592 0247_ $$210.3850/978-981-07-2219-7_P403
$$adoi
000004592 04107 $$aeng
000004592 046__ $$k2012-05-23
000004592 100__ $$aBasu, Biswajit
000004592 24500 $$aVibration of Wind Turbines Under Seismic Excitations

000004592 24630 $$n5.$$pProceedings of the 5th Asian-Pacific Symposium on Structural Reliability and its Applications
000004592 260__ $$bResearch Publishing, No:83 Genting Lane, #08-01, Genting Building, 349568 SINGAPORE
000004592 506__ $$arestricted
000004592 520__ $$2eng$$aEdgewise vibrations can be of significant concern in wind turbines, as this mode is lightly damped and can lead to violent vibrations. In fact, under certain conditions the first edgewise mode may exhibit a very low or even negative damping (Staino et al. 2012). The effects of seismic excitations on wind turbine vibration were investigated in the literature, however, the blade-tower interactions and effects of wind turbulence were not considered. 
 Edgewise vibration of a three-bladed Horizontal-Axis Wind Turbine (HAWT) under the action of operational loads and seismic ground motions is presented in this paper. The turbine model describes the dynamics of edgewise vibrations considering the aerodynamic properties of the blade, variable mass and stiffness per unit length and taking into account the effect of centrifugal stiffening, gravity and the interaction between the blades and the tower. Aerodynamic loads corresponding to a combination of steady wind including the wind shear and the effect of turbulence are computed by applying the modified Blade Element Momentum (BEM) theory. An edgewise reduced order model is adopted where each blade is modeled as a Bernoulli–Euler cantilever beam vibrating in its fundamental mode. The seismic load is contributed by ground motions due to earthquakes simulated as stochastic processes. In the case study presented for a 5-MW National Renewable Energy Laboratory (NREL) wind turbine, the influence of seismic excitation on the vibration in rotor plane of the nacelle is significant as shown in Figure 1.

000004592 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000004592 653__ $$aWind turbine, Edgewise vibration, Earthquake, Stochastic simulation, Operational safety.

000004592 7112_ $$a5th Asian-Pacific Symposium on Structural Reliability and its Applications$$cSingapore (SG)$$d2012-05-23 / 2012-05-25$$gAPSSRA2012
000004592 720__ $$aBasu, Biswajit$$iStaino, Andrea$$iDinh, Nguyen Van
000004592 8560_ $$ffischerc@itam.cas.cz
000004592 8564_ $$s352413$$uhttps://invenio.itam.cas.cz/record/4592/files/P403.pdf$$yOriginal version of the author's contribution as presented on CD, .
000004592 962__ $$r4180
000004592 980__ $$aPAPER