
Mode  Wireless  Tethered 
Frequency difference (%) 
Damping difference (%)  Descriptions of mode shape 
(Hz)  (%)  (Hz)  (%) 

1  0.775  1.93  0.775  1.56  0  23.7  1st vertical bending (antisymmetric) 
2  1.230  1.36  1.232  1.37  0.16  0.7  1st lateral bending (symmetric) 
3  1.254  0.64  1.251  1.32  0.24  51.5  2nd vertical bending (symmetric) 
4  1.603  1.52  —  —  —  —  1st torsion (antisymmetric) 
5  1.707  0.91  1.712  1.71  0.29  46.8  3rd vertical bending (symmetric) 
6  1.898  1.63  1.867  1.06  1.66  53.8  2nd torsion (symmetric) 
7  2.429  1.97  2.425  2.31  0.16  14.7  3rd torsion (symmetric) 
8  2.872  2.38  2.683  1.50  7.04  58.7  4th vertical bending (antisymmetric) 
9  3.295  1.59  3.313  1.70  0.54  6.5  5th vertical bending (symmetric) 
