mode indicator function MIF

Definition

measure for phase purity of the measured mode shapes using a single reference

Notes

  • NOTE 1 The most common definitions applied by different modal analysis systems are: a. Breitbach (1972): b. Hunt (1984): where xj is the complex valued response at the jth structural point: ,
  • NOTE 2 MIF = 1 indicates a perfectly excited mode shape
  • NOTE 3 MIF << 1 indicates either no resonances in the frequency range or inappropriately excited modes.
  • NOTE 4 The mass weighting is often neglected.
  • NOTE 5 The MIF is a special case of the MMIF (see 3.2.35).
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