Anthrax egg shot model
Oscillation is starting right after the inspection of the hole. The amplitude is approximately constant with a constant mean distance between head and hole. This is suggesting a bi-level controller.
Figure 1 : The one dimensional model.
For a bi-level controller the force is either +Fmax or -Fmax. The egg availability parameter is indicating the availability of an egg to be shot. For Anthrax the reference is constant until an egg is shot. Fmax is increased in the act of shooting the egg.
The result of the simulation is given in blue in Fig. 2
Figure 2
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