Calculating EigenVectors from Mode Shapes

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Chris Dan
Chris Dan 2020-6-24
评论： KSSV 2020-6-24
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..?

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回答（1 个）

KSSV
KSSV 2020-6-24
  2 个评论
Chris Dan
Chris Dan 2020-6-24
I read it, but I cannot understand how he did it....
KSSV
KSSV 2020-6-24
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.

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