The equation of motion.

Watch when w~w0case.
| Parameter | Description | Initial | Resonance |
|---|---|---|---|
| w0 | Friquency | 1.0 | 1.0 |
| Ex w | Force friquency | 0.8 | 1.0 |
| Ex F | Force intensity | ||
| k | Viscosity coefficient | 0.2 | 0 |
| time | Oservation time |
| SAKURAI, Masashi: | E-mail : m.sakurai@cmt.phys.kyushu-u.ac.jp Web page : http://www.cmt.phys.kyushu-u.ac.jp/~M.Sakurai/ |