000022509 001__ 22509
000022509 005__ 20170724144652.0
000022509 04107 $$aeng
000022509 046__ $$k2017-07-04
000022509 100__ $$aFontecha, Robert
000022509 24500 $$aDetermination of aerodynamic damping and vortex-shedding correlation length of wind turbine towers based on wind tunnel experiments with high frequency force balance (HFFB) and forced-oscillations methods

000022509 24630 $$n7.$$p7th European and African Conference on Wind Engineering 
000022509 260__ $$bl'Association pour l'Ingénierie du Vent
000022509 506__ $$arestricted
000022509 520__ $$2eng$$aThe presented investigations aim to suggest more realistic models to predict the dynamic behavior of wind turbine structures. Two key issues are addressed: the aerodynamic damping and the cross-wind vibrations. Based on experimental studies in the boundary layer wind tunnel, aerodynamic information for both effects has been obtained. Cylindrical models derived from a scaled model of a wind energy tower (1:150) have been tested in a test bench designed to carry out HFBB, dynamic wind pressures and forced-oscillation experiments. Reynolds number based scale effects on the tower model have been studied previously. In the predictions of cross-wind vibrations, the vortex shedding correlation length plays an important role. Therefore, wind dynamic pressures were measured along static cylinder models using pressure taps to determine realistic values of this magnitude. Motion-induced wind vibrations can be significantly influenced by the aerodynamic damping. Using the forced-oscillations method, experiments have been performed under controlled system oscillation with varying wind speed in cylinder models. The measured base model forces were correlated with the model motion using spectral methods to obtain the aerodynamic stiffness and damping coefficients. Both aerodynamic studies will allow more detailed models for the design of new wind tower structures. The acquired information will be applicable in MB-simulations to obtain more realistic and accurate wind turbine performances

000022509 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022509 653__ $$a

000022509 7112_ $$a7th European and African Conference on Wind Engineering$$cLiège, BE$$d2017-07-04 / 2017-07-07$$gEACWE2017
000022509 720__ $$aFontecha, Robert$$iFeldmann, Markus$$iKemper, Frank
000022509 8560_ $$ffischerc@itam.cas.cz
000022509 8564_ $$s1171117$$uhttps://invenio.itam.cas.cz/record/22509/files/22.pdf$$yOriginal version of the author's contribution in proceedings, id 22, section .
000022509 962__ $$r22493
000022509 980__ $$aPAPER