Astrom's controller for second order processes.
Transfer function of the controlled system:
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Vector of identification initial parameter estimations:
Controller specific parameters:
Parameter |
Description |
alfa - filter constant |
Filtration coefficient a used by filter of process output signal. The time constant of the filter is: where usually 3 < a < 20 |
beta – weight |
The weight b of reference signal in proportional component of controller. The weight should be 0 < b £ 1 |
Control law:
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where:
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where controller parameters , and are calculated using following equation:
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Variables and are ultimate gain and ultimate period respectively.
Source code:
sid |
on-line identification s-function |
zn2ast |
function for computation of controller parameters |
scast |
controller s-function |
See also:
On-line identification methods