effective modal mass


measure of the mass portion associated to the mode shape with respect to a reference support point


  • NOTE 1 The six effective masses for a normal mode, {F}r are the diagonal values of the modal mass matrix. where {L}r is the modal participation factor: mr is the generalised mass: {F}r, is the elastic mode r {FRB}, is the rigid body mode.
  • NOTE 2 The sum of the effective masses provides an indication of the completeness of the measured modes, since the accumulated effective mass contributions from all modes equal the total structural mass and inertia for each of the six translatory and rotatory DOFs, respectively.
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