Modal Overlap Factor of a beam with an acoustic black hole termination

Vivien Denis 1 Adrien Pelat 1 François Gautier 1 Benjamin Elie 2
2 MULTISPEECH - Speech Modeling for Facilitating Oral-Based Communication
Inria Nancy - Grand Est, LORIA - NLPKD - Department of Natural Language Processing & Knowledge Discovery
Abstract : Acoustic Black Hole (ABH) effect is a passive vibration reduction technique which takes advantage of properties of wave propagation in thin structures of varying thickness. A practical implementation of ABH on a uniform beam consists in an extremity whose thickness follows a power-law profile covered by a very thin layer of additional damping material. A modal analysis based on a High Resolution technique shows that the ABH significantly increases the Modal Overlap Factor (MOF) of the beam, thus reducing the resonant behaviour of the structure. Further investigations, including a two dimensional numerical model of the structure based on the finite difference method, show that this MOF can be explained by an increase of the modal density and a high damping of a number of modes of the structure due to the ABH.
Document type :
Journal articles
Complete list of metadatas

Cited literature [12 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01288274
Contributor : Vivien Denis <>
Submitted on : Monday, March 14, 2016 - 6:05:32 PM
Last modification on : Monday, February 10, 2020 - 3:04:08 PM
Long-term archiving on: Wednesday, June 15, 2016 - 3:21:26 PM

File

Denis14_preprint.pdf
Files produced by the author(s)

Identifiers

Citation

Vivien Denis, Adrien Pelat, François Gautier, Benjamin Elie. Modal Overlap Factor of a beam with an acoustic black hole termination. Journal of Sound and Vibration, Elsevier, 2014, 333 (12), pp.2475-2488. ⟨10.1016/j.jsv.2014.02.005⟩. ⟨hal-01288274⟩

Share

Metrics

Record views

314

Files downloads

531