Stability of Large Flocks: an Example

Details Stability of Large Flocks: an Example Stability of Large Flocks: an Example

2010-02-03

arxiv.org/abs/1002.0768v2

Nonlinear Sciences

Pattern Formation and Solitons

9 pages, 5 figures

Scientific paper

The movement of a flock with a single leader (and a directed path from it to every agent) can be stabilized. Nonetheless for large flocks perturbations in the movement of the leader may grow to a considerable size as they propagate throughout the flock and before they die out over time. As an example we consider a string of N+1 oscillators moving in the line. Each one `observes' the relative velocity and position of only its nearest neighbors. This information is then used to determine its own acceleration. Now we fix all parameters except the number of oscillators. We then show (within a certain class of systems) that a perturbation in the leader's orbit is almost always amplified exponentially in N as it propagates towards the outlying members of the flock. The only exception is when there is a symmetry present in the interaction: in that case the growth of the perturbation is linear in N.

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