Solving non-homogeneous differential equation
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I have a second order differential equation: M*x''(t) + D*x'(t) + K*x(t) = F(t) which I have rewritten into a system of first order differential equation.
fun = @(t,q) [q(2) ; -K/M*q(1) - D/M*q(2)] + [0 ; F/M]
Now, I have an array of F-values for different t-values going from 0 to 300 seconds with a step size of 0.1s. K, D and M are just constants which are all known. I want to find the corresponding x-values for the same t-values using the ode45 but I keep getting an error. The initial condition is x(0) = 0 and x'(0) = 0. This is how I use it:
[t y] = ode45(fun,(0:0.1:300),[0 0])
Can anyone tell me what I am doing wrong?
1 commentaire
Talari Nageswari
le 20 Jan 2022
i did the same thing
can i get the value of x'(t) and x(t) by using the above van der pol function
Réponses (2)
Torsten
le 8 Oct 2018
Take a look at the example
"ODE with Time-Dependent Terms"
under
https://de.mathworks.com/help/matlab/ref/ode45.html
Best wishes
Torsten.
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Eric Robbins
le 26 Nov 2019
If you're getting a concatenation error try [0*y(2);F/M] so that the first row is consistently sized with the other vectors.
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