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

1  0.774  2.14  0.780  1.99  0.77  7.5  1st vertical bending (antisymmetric) 
2  1.210  1.03  1.211  0.89  0.08  15.7  1st lateral bending (symmetric) 
3  1.255  0.79  1.258  1.05  0.24  24.8  2nd vertical bending (symmetric) 
4  1.631  0.27  1.638  0.87  0.43  69.0  1st torsion (antisymmetric) 
5  1.705  0.57  1.699  0.99  0.35  42.4  3rd vertical bending (symmetric) 
6  1.897  0.62  1.887  1.29  0.53  51.9  2nd torsion (symmetric) 
7  2.440  0.54  2.443  0.69  0.12  21.7  3rd torsion (symmetric) 
8  2.700  0.74  2.730  0.65  1.10  13.8  4th vertical bending (antisymmetric) 
9  3.296  0.28  3.317  0.76  0.63  63.2  5th vertical bending (symmetric) 
