excluding C matrix from state space block in controller design with simulink
mer ve
In simulink there is a state space block which has equations of x'=Ax+Bu and y=Cx.
I want to design a feedback matrix using ackerman formula but feedback control matrix should have input from states which is before C matrix.How can i exclude C matrix?
Regards
Arkadiy Turevskiy
A couple of ways:
1) add another state-space block to calculate x. To do that set C to unity diagonal and D to zero for that block., i.e.,
>> c=diag(linspace(1,1,length(a)));
>>d=zeros(length(a),1);
Now you have two state-space blocks - one that calculates x that you can use to calculate u with ackerman, another one that calculates your y.
2) Use one state-space block, but modify C and D matrices to caclulate
new _y = [ old _y x];
Then you can simply select block outputs that correspond to x.
HTH.
Arkadiy
mer ve
Both ways are good but i tried 1st way.
I have a SISO system.
So both C vector(to calculate output) and (feedback) controller vector should be represented in simulink as a block but i couldnt find it:( Plz let me know how i can represent a vector(1x3) whose input is my states(3x1) and output is the system output(1x1).
Regards
mer ve
Arkadiy Turevskiy
The first block should be parameterized with your a,b,c,d
The second block (the one that will give you x to use for control signal calculation), should use a,b,c1,d1, where
c1=(1 0 0; 0 1 0; 0 0 1);
d1=0;
(this assumes you have 3 states and single input, single output, as you mentioned)
"mer ve" <merv...@hotmail.com> wrote in message <id2nbk$2h1$1...@fred.mathworks.com>...
mer ve
I have one more question.
I am using simulink model which includes a variable which was defined in a m file.I want user to change it from gui which was created with control desk.control desk communicates with simulink but doesnt change a variable from mfile.how can i overcome??
Thanks
Avinakar
Hi,
As you said ControlDesk is GUI which acts a testing and diagnosis tool for real time systems only for parameters in simulink.