Mass matrix construction, natural frequency calculation
Mass matrix construction, natural frequency calculation
(OP)
Mass matrix construction, natural frequency calculation:
I have a 3D element with a 12x12 consistent mass matrix.
However, the element also has a lumped mass on one side.
How do I incorporate this lump in the 12x12 matrix?
Just add the mass to the 6 diagonal elements of the joint it is attached to?
And what if the mass is attached excentrically?
I have a 3D element with a 12x12 consistent mass matrix.
However, the element also has a lumped mass on one side.
How do I incorporate this lump in the 12x12 matrix?
Just add the mass to the 6 diagonal elements of the joint it is attached to?
And what if the mass is attached excentrically?






RE: Mass matrix construction, natural frequency calculation
RE: Mass matrix construction, natural frequency calculation
the 6 diag. nodes in the MM refer to one node, don't they?
I thought, maybe you just have to add the consistent MM and the lumped (mass at extremity) MM.
and a lumped MM is diagonal-elements-only.
RE: Mass matrix construction, natural frequency calculation