Issue 46

S. Ivorra et alii, Frattura ed Integrità Strutturale, 46 (2018) 203-215; DOI: 10.3221/IGF-ESIS.46.19 211 Fig. 12 shows the modes associated to the main frequencies obtained by the application of OMA: the first two modes with bending-torsional components, and the third mode practically torsional. Figure 11 : Artemis software. Simplified tower geometry and disposition of the accelerometers. Slave nodes equations for the analysis. (a) (b) (c) Figure 12 : OMA results. (a) First bending-torsion mode. (b) Second bending-torsional mode. (c) Torsional mode. node ( 1 , 1 ) = node ( 2 , 1 ) node ( 1 , 2 ) = node ( 4 , 2 ) node ( 3 , 1 ) = node ( 2 , 1 ) node ( 3 , 2 ) = node ( 4 , 2 ) node ( 1 , 3 ) = node ( 2 , 3 ) = node ( 3 , 3 ) = node ( 4 , 3 ) =0 node ( 7 , 1 ) = node ( 8 , 1 ) node ( 5 , 2 ) = node ( 8 , 2 ) node ( 7 , 2 ) = node ( 6 , 2 ) node ( 5 , 1 ) = node ( 6 , 1 ) node ( 11 , 1 ) = node ( 12 , 1 ) node ( 9 , 2 ) = node ( 12 , 2 ) node ( 9 , 1 ) = node ( 10 , 1 ) node ( 11 , 2 ) = node ( 10 , 2 )