modal analysis
modal analysis
(OP)
hello,
Can i determine the effect of friction on the modal damping values? using a finite element method
Can i determine the effect of friction on the modal damping values? using a finite element method





RE: modal analysis
RE: modal analysis
the normal modes analysis available in Nastran does not take into account the damping, in fact the equation of motion is
[M]{a} + [K]{u} = 0
which is the equation of motion for undamped free vibration (where: [M] is the mass matrix, [K] the stiffness matrix, {a} the acceleration and {u} the displacement vectors).
To take into account modal damping you need to run a frequency analysis with a force applied to the structure.
Regards
RE: modal analysis
can you dtermine the strain energy to calculate the damping??
thx regard