MATLAB: How make single block diagram with this given parameters

block diagramsimulink

Hello, I was given a block diagram for homework and I was asked to find the transfer function. I found the transfer function but I would like to test its response to ensure that block diagram simplification was done properly. I would like to make a single block and enter all parameters to compare the responses. Simulink has some transfer function blocks but I don know how to enter *s* in the denominator. Any help would be appreciated.

Best Answer

Hi. If you are using a Transfer Fcn block and have the coefficients defined in your workspace, then enter the equations in the block as shown below. The result transfer function will appear as shown.

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MATLAB: How to pass parameters

Not sure if this is what you want, but just pass them in:

dX = -13.925*A*B*C*x + f(t,A,B,C);
   :
function fval = f(t,A,B,C)
   :
  etc

If you want to pass them in from upstream of the ode45 call, then:

A = log(2);
B = log(3);
C = 1;
DEABC = @(t,x) DE(t,x,A,B,C);
[T,X] = ode45(DEABC, tspan, x0);
    :
function dX = DE(t,x,A,B,C)
dX = -13.925*A*B*C*x + f(t,A,B,C);
    :
function fval = f(t,A,B,C)
    :
   etc

MATLAB: How to create a transfer function system model from code with given parameters

Try this:

numerator = [0 0.9614 0];
denominator = [1.0000   -1.6634    0.8313 0];
tf_si = tf(numerator,denominator,'ts',1, 'Variable','z^-1')

producing:

tf_si =
 
          0.9614 z^-1
  ----------------------------
  1 - 1.663 z^-1 + 0.8313 z^-2
 
Sample time: 1 seconds
Discrete-time transfer function.

All the relevant vector elements need to be specified.

Best Answer

Related Solutions

MATLAB: How to pass parameters

MATLAB: How to create a transfer function system model from code with given parameters

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