Table 1: Comparison of natural frequencies for the first ten global modes.

Mode orderOESC (Hz)MESC (Hz)Structural componentDescription (MESC)

10.27250.2756DeckAntisymmetric vertical bending
20.29390.2925Main TowerLateral bending
30.29610.2947Main TowerLongitudinal bending
40.44290.4470DeckTorsional bending
50.54240.5600DeckSymmetric vertical bending
6 (41)0.65920.6686DeckAntisymmetric vertical bending
7 (42)0.67370.6714Minor tower 1, 2Lateral + longitudinal bending
8 (56)0.67480.6728Minor tower 1, 2Longitudinal bending
9 (57)0.69960.6972Minor tower 1, 2Lateral bending
10 (69)0.69960.6972Minor tower 1, 2Longitudinal + lateral bending

Note. The numbers in brackets are the mode order of the MESC model.