mode indicator function MIF


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


  • 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).
Glossary app image

ECSS Glossary mobile applications

ECSS Glossary mobile apps available from iOS and Android store and ECSS Glossary Plugin for MS Word available from Microsoft Appstore
Search the online Glossary