320276.fig.003a
(a)
320276.fig.003b
(b)
Figure 3: Simulation of the system (10); (a) provided external force described as (20); (b) simulation results by RK4 with the timestep size 0.001 s. The parameters are chosen as  kg,  N,  N/m, and  s. The initial conditions are  m and  m/s.