P, PD Control 3P 0T1T2 Step Response

Cuthbert Nyack
Applet shows the step response of a third order type 1 system with PD control.

With the parameter values (2.0, 1.0, 1.0, 1.4, 2.0), the P controlled system is unstable but the PD controlled gives a reasonable response. It is possible for this system to become unstable with PD control if Td is not large. eg the values (19.7, 1.0, 1.0, 0.45, 2.0).

Gif image below show how the applet should appear.

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COPYRIGHT 2006 Cuthbert Nyack.