Eigenvector problem with complex conjugate eigenvalues
3 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Enterprixe
el 8 de Abr. de 2017
Respondida: Torsten
el 10 de Abr. de 2017
Hello, im solving here a viscous damping problem. As you can see det(A) is the equation that must be solved in order to obtain the eigenvalues of the problem. My issue is after having all 10 eigenvalues (20 with their conjugates) i do not know exactly how to make MATLAB calculate me the eigenvectors of the problem, given that im not using the 'eig' command.
M=[1 0 0 0 0 0 0 0 0 0;
0 1 0 0 0 0 0 0 0 0;
0 0 1 0 0 0 0 0 0 0;
0 0 0 1 0 0 0 0 0 0;
0 0 0 0 1 0 0 0 0 0;
0 0 0 0 0 2 0 0 0 0;
0 0 0 0 0 0 3 0 0 0;
0 0 0 0 0 0 0 3 0 0;
0 0 0 0 0 0 0 0 4 0;
0 0 0 0 0 0 0 0 0 1];
K=[1 -1 0 0 0 0 0 0 0 0;
-1 3 0 0 0 0 -2 0 0 0;
0 0 3 -1 0 0 0 -2 0 0;
0 0 -1 1 0 0 0 0 0 0;
0 0 0 0 1 -1 0 0 0 0;
0 0 0 0 -1 3 -2 0 0 0;
0 -2 0 0 0 -2 8 -4 0 0;
0 0 -2 0 0 0 -4 11 -5 0;
0 0 0 0 0 0 0 -5 10 -5;
0 0 0 0 0 0 0 0 -5 5];
F=[1 -1 0 0 0 0 0 0 0 0;
-1 2 0 0 0 0 -1 0 0 0;
0 0 0 0 0 0 0 0 0 0;
0 0 0 0 0 0 0 0 0 0;
0 0 0 0 0 0 0 0 0 0;
0 0 0 0 0 0 0 0 0 0;
0 -1 0 0 0 0 2 -1 0 0;
0 0 0 0 0 0 -1 1 0 0;
0 0 0 0 0 0 0 0 0 0;
0 0 0 0 0 0 0 0 0 0];
f=2/50;
m=8;
k=2000;
Mv=m*M;
Fv=f*F;
Kv=K*k;
syms s phi
A=s^2*Mv +s*Fv+ Kv;
r=det(A);
s=double(subs(solve(r)));
for i=1:20
A=s(i)^2*Mv +s(i)*Fv+ Kv;
eqn= A*phi==0;
Mod(i)=double(subs(solve(eqn,phi)));
end
0 comentarios
Respuesta aceptada
Torsten
el 10 de Abr. de 2017
null(A) might help:
https://de.mathworks.com/help/matlab/ref/null.html
Best wishes
Torsten.
0 comentarios
Más respuestas (0)
Ver también
Categorías
Más información sobre Linear Algebra en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!