How do I add in external equations in ODE45 simulation?

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Daniel
Daniel el 24 de Mayo de 2017
Comentada: Daniel el 24 de Mayo de 2017
Hello!
This is my state space model:
// State space
der(x1) = x2;
m1*der(x2) = -k1*(x1 - x3) + Pp*Ap*10 - Pm*Am*10 -b1*(x2 - x4) - gamma*x2;
der(x3) = x4;
M*der(x4) = k1*(x1 - x3) - k2*(x3 - L2*sin(x5)) + b1*(x2 - x4) - M*g*mu*x4;
der(x5) = x6;
1/3*m2*L2^2*der(x6) = L2*k2*(x3 - L2*sin(x5)) - k3*x5 - b2*x6 + L2/2*m2*g*sin(x5);
And this is my external functions who gives values to the state space model. How do I include this inside the ODE45 function?
// Dynamic flow
Qin = 15*R1*sqrt(P - Pp);
// Dynamic pressure
Pp = beta/(Ap*x1)*(Qin - 6*Ap*x2);
Pm = beta/(Am*(L1 - x1))*(6*Am*x2 - 6*Am*x2*R2);
This is probably very easy to do, but I don't know how to do that.
  2 comentarios
Star Strider
Star Strider el 24 de Mayo de 2017
That does not look like MATLAB syntax.
Please post your MATLAB code.
Daniel
Daniel el 24 de Mayo de 2017
I don't have a MATLAB code. This is a OpenModelica code. The only who differ is the der() command. der() is the derivative.

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