Corrigendum to “Modal Mass and Length of Mode Shapes in Structural Dynamics”

The literature about the mass associated with a certain mode, usually denoted as modal mass, is sparse. Moreover, units of depend on technique used to normalize mode shapes, and its magnitude depends number degrees freedom (DOFs) discretize model. This has led situation where meaning length shape not well understood. As result, normally, both measure have no individual quantities, but only when they are combined in frequency response function. In this paper, problems defining discussed, solutions found define quantities such way that physical can be estimated an objective way.