Fig. 2.

Approximated analytical model of the cantilever beam. (a) The damping model, where m stands for the effective mass, c stands for the system damping, k stands for the stiffness of the beam and y(t) stands for the excitation vibration. (b) The excitation model in which a point force $\text{m}{\displaystyle \ddot{\text{y}}}(\text{t})$ is applied at the free end of the beam to determine w_d at any point along x direction.