Calculating EigenVectors from Mode Shapes

Hello,

I want to plot eigen vectors and mode shapes of a Timoschenko beam. I already have solved the system using finite element methods and generated stiffness, mass and damping matrices.

I am attaching them as files. I calculated natural frequencies using this equation

de = sqrt(eigs(Stiffness_Global,Mass_Global,12,'smallestabs'))/((2*pi));

and the result I got is this:

Now, how can I calculate mode shapes of these frequencies and plot them..?

I tried using this equation

[V,D] = eigs(Stiffness_Global,Mass_Global,12,'smallestabs')

but the results, I cannot understand them

Does anyone know..?

Answer 1

[KSSV]

Refer this:

https://in.mathworks.com/matlabcentral/fileexchange/30970-natural-frequencies-buckling-loads-of-columns-using-finite-element-method

[Chris Dan]

I read it, but I cannot understand how he did it....

[KSSV]

Check the PlotModeShapes function in that.

Your eigenvector is V. You have degrees of freedom in an order, pick the dof which corresponds to deflection/ displacement and use plot.