Solution of spring mass system with cubic stiffness
4 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Murat Yetkin
am 11 Okt. 2018
Beantwortet: Torsten
am 11 Okt. 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 Kommentare
Akzeptierte Antwort
Torsten
am 11 Okt. 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 Kommentare
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Ordinary Differential Equations finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!