sisoinit - Configure SISO Design Tool at startup

Syntax

init_config = sisoinit(config)

Description

init_config = sisoinit(config) returns a template init_config for initializing Graphical Tuning window of the SISO Design Tool with the one of the following control system configurations:

config corresponds to the control system configuration. Available configurations include:

• config = 1 (default) — C in forward path, F in series

• config = 2 — C in feedback path, F in series

• config = 3 — C in forward path, feedforward F

• config = 4 — Nested loop configuration

• config = 5 — Internal model control (IMC) structure

• config = 6 — Cascade loop configuration

For each configuration, you can specify the plant models G and H, initialize the compensator C and prefilter F, and configure the open- and closed-loop views by specifying the corresponding fields of the structure init_config. Then use sisotool(init_config) to start the SISO Design Tool in the specified configuration.

Output argument init_config is an object with properties. The following tables list the block and loop properties.

Block Properties

Loop Properties

Examples

Initialize SISO Design Tool with C in feedback path using an LTI model:

 % Single-loop configuration with C in the feedback path.
T = sisoinit(2);         
% Model for plant G.
T.G.Value = tf(1, [1 1]); 
% Initial compensator value.
T.C.Value = tf(1,[1 2]);
% Views for tuning Open-Loop OL1.
T.OL1.View = {'rlocus','nichols'}; 
% Launch SISO Design Tool using configuration T
sisotool(T)

Initialize SISO Design Tool with C in feedback path using an array of LTI models:

% Specify an initial configuration.
initconfig = sisoinit(2);
% Specify model parameters.
m = 3;
b = 0.5;
k = 8:1:10;
T = 0.1:.05:.2;
% Create an LTI array to model variations in plant G.
for ct = 1:length(k);
    G(:,:,ct) = tf(1,[m,b,k(ct)]);
end
% Assign G to the initial configuration.
initconfig.G.Value = G;
% Create an LTI array to model variations in sensor H.
for ct = 1:length(T);
    H(:,:,ct) = tf(1,[1/T(ct), 1]);
end
% Assign H to the initial configuration.
initconfig.H.Value = H;
% Specify initial controller.
initconfig.C.Value = tf(1,[1 2]);
% Views for tuning Open-Loop (OL1)
initconfig.OL1.View = {'rlocus','bode'};
% Launch SISO Design Tool using initconfig.
sisotool(initconfig)

See Also

sisotool

How To

• SISO Design Tool
• Control Design Analysis of Multiple Models

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