Nonlinear Dynamics and Chaos
Nonlinear Dynamics and Chaos
2nd Edition
ISBN: 9780429972195
Author: Steven H. Strogatz
Publisher: Taylor & Francis
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Chapter 7.5, Problem 7E
Interpretation Introduction

Interpretation:

To sketch the nullclines for the system.

To determine c1 and c2 and show that the system exhibits relaxation oscillations for c1< c <c2.

To show that the system is excitable if c is slightly less than c1

Concept Introduction:

Nullclinesare a set of points in the phase plane where x˙ = y˙ = 0.

The set of points in a phase plane where x˙ = 0 is known as x-nullclines. The geometrical meaning of x-nullclines is the points where the vectors are pointed either straight upward or downward.

The set of points in a phase plane where y˙ = 0 is known as y-nullclines. The geometrical meaning of y-nullclines is the points where the vectors are pointed horizontally.

To find the equation for x-nullclines and y-nullclines, put x˙ = y˙ = 0 and solve for

x = f(x,y) and y = f(x,y)

The Taylor’s series expansion of a function 1x for x1 is

1x=112x18x2116x3............

Here, higher order terms can be neglected because x1.

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