Table 1: Modal parameters of the FEM model.

Mode number*Generalized mass × 107 (kg·m2)Generalized stiffness × 109 (N·m)Frequency (Hz)Modal damping

11.29530.01470.16940.0102
20.99370.01780.21320.0112
30.49450.02220.33700.0150
40.87240.11150.56890.0234
50.82730.21530.81200.0326
60.35440.16001.06950.0426

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