zn3fd

Controller for third order processes with filtration of D-component using Tustin approximation.

Transfer function of the controlled system:

Vector of identification initial parameter estimations:

Controller specific parameters:

Parameter

Description

alfa - filtration coefficient

Filtration coefficient a used by filter of process output signal. The time constant of the filter is:  where usually 3 < a < 20

Control law:

where ek is control error (  ) and controller parameters are calculated using following equations:

 

 

Variables  and  are ultimate gain and ultimate period respectively.

Source code:

sid

on-line identification s-function

zn3fd

function for computation of controller parameters

scqp

controller s-function

See also:

On-line identification methods

Computation of ultimate gain and period

List of common controllers parameters