An approach for modal coupling based on experimental and computed modes using non-conforming grids

Rafael Engelmann, Florian Toth, Christoph Gabriel, Manfred Kaltenbacher

Research output: Contribution to journalArticlepeer-review

Abstract

The combination of experimental and numerical data is a typical challenge in complex vibro-acoustic problems. Rather than employing model-updating techniques, we combine the modal substructuring technique with non-conforming grids in order to be able to directly employ experimental and numerical modes for the description of weakly coupled vibro-acoustic systems. By incorporating Delaunay triangulation in the process, mechanical modes of any origin and discretized in terms of point clouds can be coupled with computational acoustic modes. The method is validated using a two-sided vibro-acoustic box. It is demonstrated that, by employing suitable interpolation techniques, systems based on coarsely discretized experimental modes can be used analogously to computational modes. The approach makes it straightforward to take into account modal damping and to fit numerical modes via experimental modal parameters, such as eigenfrequency, modal mass and damping.

Original languageEnglish
Article number117041
JournalJournal of Sound and Vibration
Volume534
DOIs
Publication statusPublished - 15 Sep 2022

Keywords

  • Modal analysis
  • Normal mode substructuring
  • Vibroacoustics

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Acoustics and Ultrasonics

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