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Help Using Simulink tp draw ODE

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Dylan
Dylan 2014-2-3
评论： Mischa Kim 2014-2-4
Hi,
I was wondering if someone could help me create a basic differential equation in Simulink. I'm trying to create the following equations
I tried using this as an example ODE to help me solve this problem but it doesn't seem to help. The link above has a very similar ODE. When I create two of what is done in the example and try and connect it to a XY Graph I don't get anything so I'm doing something wrong but am not sure what. Thanks for any help.
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Mischa Kim
Mischa Kim 2014-2-3
Please add follow-up questions as comments to the respective answer.

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回答（2 个）

Mischa Kim
Mischa Kim 2014-2-3
Dylan, the basic structure looks like this:
Try using an embedded MATLAB function to compute the state derivative
function Xdot = fcn(X, u)
Xdot = [0; 0];
x = X(1);
y = X(2);
Xdot = [y*u; -x*u];
end
As a final note, make sure to adjust the limits in the XY Graph according to the signal outputs.
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Mischa Kim
Mischa Kim 2014-2-3
Double-click the integrator block and add the intial conditions, e.g., [1; 1] ;

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Dylan
Dylan 2014-2-3
Hey,
I seem to be having some issues. I created the circuit like you did,
and used the following function
But when I run it I don't get anything on the graph
Am I doing something wrong? Also how would I go about entering in initial conditions for X and Y if they were given. Thanks for your help.
  1 个评论
Mischa Kim
Mischa Kim 2014-2-4
Dylan, could you please post follow-up questions as comments? Did you get it to work with setting the initial conditions? See comment on top.

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