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  1. jabla71

    Which Solver can do eigenvalues with Lagrande multipliers

    Well finally after getting back to this problem. The DGGEVX routine did the job quite well. Thank you all for your input Cheers
  2. jabla71

    Which Solver can do eigenvalues with Lagrande multipliers

    Thank you all, I will be looking in to the eigen shift method. Kind regards J Blair
  3. jabla71

    Which Solver can do eigenvalues with Lagrande multipliers

    Well, Costas... you are right with the rigidbody mode. I am looking at the structures behavior in water so I need the free state. Ansys, Hypermesh and other programs are able to come about eigen results even if the matrix is sigular or closed to it. But my in house program with can not...
  4. jabla71

    Which solver can deal with Lagrange multipliers?

    I am trying to figure out which solver (Fortran) will be able to calculate eigenvalues for a matrix that has been augmented with Lagrange multipliers. Basically I have a FEM model with 20node solids and 4node plates that are coupled with Lagrange multies in a inhouse FE program. I have been...
  5. jabla71

    Which Solver can do eigenvalues with Lagrande multipliers

    I am trying to figure out which solver (in Fortran) will be able to calculate eigenvalues for a matrix that has been augmented with Lagrange multipliers. Basically I have a FEM model with 20node solids and 4node plates that are coupled with Lagrange multies in a inhouse FE program. I have been...

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