Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2013 Mar 6;10(80):20121013. doi: 10.1098/rsif.2012.1013

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2013 The Author(s) Published by the Royal Society. All rights reserved.

PMC Copyright notice

Figure 1. — (a) Time course x(t) of a van der Pol oscillator perturbed by external force F(t). The equation of motion is with μ = 0.3. Blue trace, perturbation F(t); black trace, x(t) before and after perturbation; green trace, x(t) during perturbation and dashed trace, continuation of unperturbed oscillation (perturbation not switched on, F(t) = 0). (b) Limit cycle of van der Pol oscillator. The black and green traces from (a) are replotted in the phase space (velocity dx/dt versus coordinate x); increasing time t corresponds to clockwise rotation.

Inline graphic — (a) Time course x(t) of a van der Pol oscillator perturbed by external force F(t). The equation of motion is with μ = 0.3. Blue trace, perturbation F(t); black trace, x(t) before and after perturbation; green trace, x(t) during perturbation and dashed trace, continuation of unperturbed oscillation (perturbation not switched on, F(t) = 0). (b) Limit cycle of van der Pol oscillator. The black and green traces from (a) are replotted in the phase space (velocity dx/dt versus coordinate x); increasing time t corresponds to clockwise rotation.