Chases and Escapes by Paul J. Nahin
Author:Paul J. Nahin [Nahin, Paul J.]
Language: eng
Format: epub
ISBN: 9781400842063
Published: 0101-01-01T00:00:00+00:00
3.2 The Symmetrical n-Bug Problem
The geometry of n bugs in a symmetric cyclic pursuit is shown in figure 3.2.1, for the situation of any two adjacent bugs, A and B. Without loss of generality I've chosen our coordinate axes such that bug A is initially on the horizontal axis (and so, of course, bug B is initially at angle 2Ï/n). The initial distance between bugs A and B (between any two adjacent bugs, in fact) is then 2r(0)sin(Ï/n), where the initial distance from the center C of the bugs' regular n-gon to each of the bugs is r (0), and r = r(t) denotes that distance for t ⥠0. Each bug always moves directly toward its nearest counterclockwise neighbor with the same speed v (I am following the notation and approach of Watton and Kydon (1969)), that is, the speed of A is v directly along the line joining A to B, as shown in the figure. We can resolve this speed into two components, a radial component vr directed inward toward C, and a transverse component vθ directed perpendicular to vr. From figure 3.2.1, or from our results at the beginning of section 2.3, these speed components are
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