(a)
(b)
(c)
(d)
Figure 4: Time histories of forces acting on guiding support plate pin shafts. (a) Force along the direction on the left guiding support plate pin shaft, (b) force along the direction on the left guiding support plate pin shaft, (c) force along the direction on the right guiding support plate pin shaft, and (d) force along the direction on the right guiding support plate pin shaft.