Table 1: Modal parameters of the FEM model. 
 Mode number*  Generalized mass × 10^{7} (kg·m^{2})  Generalized stiffness × 10^{9} (N·m)  Frequency (Hz)  Modal damping 
 1  1.2953  0.0147  0.1694  0.0102  2  0.9937  0.0178  0.2132  0.0112  3  0.4945  0.0222  0.3370  0.0150  4  0.8724  0.1115  0.5689  0.0234  5  0.8273  0.2153  0.8120  0.0326  6  0.3544  0.1600  1.0695  0.0426 


*Modes 1 and 4 are lateral displacements in direction; modes 2 and 5 are lateral disp. in direction while modes 3 and 6 are torsion.
