The applet below show how the phase plane plot of a second order system is affected by a zero.

The eg parameters (16.0, 0.04, 0.3, 20.0, 1.0) show the plot when the zero is far to the left of the imaginary axis.

The eg parameters (16.0, 0.04, 0.3, 3.6, 0.5) show the plot when the zero is brought closer to the imaginary axis.

Gif image below shows how applet should appear.

COPYRIGHT © 2006 Cuthbert Nyack.