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draw mode shape with matlab
Tue, 2011-09-13 16:04 - hrbeu221
if M is your mass matrix and K is the stiffness matrix, use
[phi w2]=eig(K,M);
phi contains the eigenvectors (each column is a modeshape)
w2 is a diagonal matrix, each diagonal entry contains wn(i)^2
(i.e. the i'th natural frequency squared).
Then how to draw the mode shape with eigenvectors?
Thank you.
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Plot against coordiantes
Each entry in columns corresponds to the normalized nodal displacement. Each of them should be plotted against the corresponding nodal coordinates of that node.
regards
asim
Ok....then how to take care
Ok....then how to take care if rotations are present in the eigen vector???
Sreenu
Inspiration and genius--one and the same.
-----------------
Siva Srinivas Kolukula
Senior Research Fellow
check the following
check the following link......
http://www.mathworks.in/matlabcentral/fileexchange/30970-natural-frequencies-buckling-loads-of-columns-using-finite-element-method
May be to plot mode shapes rotations need not to consider....
Sreenu