Eigenvalues and 0 mass nodes

Hi

I am using ANSYS to solve for the eigenvalues of an FE model with nodes with 0 mass (that is solve the generalised eigenvalue problem Kx = lambdaMx where M has some 0s on the diagonal)

Does anyone know how ansys solves this, i.e. how does ansys or any other FE program deal with these 0 mass terms?

Regards

Paul

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Paul
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