清空筛选条件
清空筛选条件

Solving non-homogeneous differential equation

39 次查看（过去 30 天）
JVM
JVM 2018-10-6
评论： Talari Nageswari 2022-1-20
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 个评论
Talari Nageswari
Talari Nageswari 2022-1-20
i did the same thing
can i get the value of x'(t) and x(t) by using the above van der pol function

请先登录，再进行评论。

请先登录，再回答此问题。

回答（2 个）

Torsten
Torsten 2018-10-8
Take a look at the example
"ODE with Time-Dependent Terms"
under
https://de.mathworks.com/help/matlab/ref/ode45.html
Best wishes
Torsten.
Eric Robbins
Eric Robbins 2019-11-26
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.

类别

在 Help Center 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by