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Solving a mass-spring-damper system with ode45
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Kebels3
el 24 de Mzo. de 2020
Comentada: Francescogiuseppe Morabito
el 3 de Mayo de 2020
Hi guys
This code is for a with mass-spring-damper system
? = 50 kg
? = 100 N/m
? = 0.1 Ns/m
F = @(t, x) [x(2); -0.1/50*x(2) - 2*x(1)];
T = 0:0.001:10;
S = [0.5 0];
[t, y] = ode45(F, T, S);
plot(t,y)
legend({'Position', 'Speed'});
ylabel('Position / Speed [m / m/s]')
xlabel('Time [s]')
title(['mass-spring-damper system']);
But now the springforce is changed to ?? = 1250?3 − 1125?2 + 350?
How do i change this in the code?
Can you guys help me out
Greets Jeroen
3 comentarios
Respuesta aceptada
Ameer Hamza
el 24 de Mzo. de 2020
If you are considering a mass-spring system vibrating under the influence of an external force Fv, then try the following code
T = 0:0.001:10;
S = [0.5 0];
[t, y] = ode45(@odefun, T, S);
plot(t,y)
legend({'Position', 'Speed'});
ylabel('Position / Speed [m / m/s]')
xlabel('Time [s]')
title('mass-spring-damper system');
function dydt = odefun(~,x)
F = 1*x(1)^3 - 1*x(1)^2 + 1*x(1);
dydt = [x(2);
- F - 0.1/50*x(2) - 2*x(1)];
end
Output
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/279185/image.png)
3 comentarios
Ameer Hamza
el 2 de Mayo de 2020
I cannot run the code because I don't have the values of the variables. And it is difficult to diagnose an issue without that. I recommend you to start a new question and include the code used to call ode45 along with the value of variables. You can then post the link in the next comment so that I will get a notification.
Francescogiuseppe Morabito
el 3 de Mayo de 2020
thank you Ameer, this is the link: https://uk.mathworks.com/matlabcentral/answers/522631-solving-second-order-ode-problem-with-ode-45.
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