This model is described in the `xrk` handout. It is essentially a
forced oscillator with nonlinear damping. The model equations are as
follows.

where , *a*, *b*, , and *A* are positive constants
and and are constants that can take any value.

The dynamics of this model can be very rich. To help focus your
investigation, I suggest fixing the parameter values , , *a*=3, *b*=0, and *A* = 1. Varying the two remaining
parameters close to the values and should give
you lots of interesting behavior.

Thu Oct 24 13:03:17 EDT 1996