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Reduce dof's in FEM

Submitted by SivaSrinivasKolukula on Thu, 07/12/2012 - 04:40

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I have MDOF equation:

MX"+CX'+KX = F(t).

Say the order of each matrix is nXn. I want to reduce the order of the matrices.

I will find the eigen vectors and get modal vectors matrix phi. I will pick some dominating frequencies say around 24 modes.

then reducedM = phi'*M*phi.