Solution of spring mass system with cubic stiffness
4 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Murat Yetkin
le 11 Oct 2018
Réponse apportée : Torsten
le 11 Oct 2018
I have below equation to solve with a given time series of gaussian white noise as f(t). Here is my code but it gives dimension error between result and the initial conditions vector. Is there any idea to fix it? Here is the error message:
Error using odearguments (line 92)
@(T,Y)SPRING(T,Y,M,C,K,K2,K3,F) returns a vector of length 10001, but the length of initial conditions vector is 2. The vector returned by @(T,Y)SPRING(T,Y,M,C,K,K2,K3,F) and the initial conditions vector must have the same number of elements.
Error in ode45 (line 115)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);*
my''+cy'+ky+k2*y^2+k3*y^3=f(t)
m=1; c=1; k=10; k2=20; k3=20;
f=randn(10000,1);
tspan=[0 10000];
y0=[0;1];
function dydt=spring(t,y,m,c,k,k2,k3,f)
dydt=[y(2); (f-c*y(2)-k*y(1)-k2*y(1)^2-k3*y(1)^3)/m];
end
[t,y]=ode45(@(t,y) spring(t,y,m,c,k,k2,k3,f), tspan, y0);
0 commentaires
Réponse acceptée
Torsten
le 11 Oct 2018
function main
m=1; c=1; k=10; k2=20; k3=20;
tspan=[0 10000];
y0=[0;1];
f=randn(10000,1);
tf = linspace(tspan(1),tspan(end),10000); % time vector at which the f-values occured
[t,y]=ode45(@(t,y) spring(t,y,m,c,k,k2,k3,tf,f), tspan, y0)
end
function dydt=spring(t,y,m,c,k,k2,k3,tf,f)
f_actual = interp1(tf,f,t);
dydt=[y(2); (f_actual-c*y(2)-k*y(1)-k2*y(1)^2-k3*y(1)^3)/m];
end
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur Ordinary Differential Equations dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!