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Is damping additive?: On the accumulated effect of interface damping and material damping
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Numerical acoustics.ORCID iD: 0000-0003-1855-5437
2010 (English)Conference paper (Other academic)
Abstract [en]

Traditionally the structural loss factor of a vibrating structure at resonance is defined by the half power bandwidth which then incorporates all mechanisms, e. g. material damping, interface damping, added viscoelastic damping, acoustic damping and damping in joints, contributing to the total damping. Damping measures based on vibration response data and vibration energy dissipated locally at interfaces and in material volumes may be computed in post processing finite element computations. Appropriately defined measures may then localize the damping to interfaces and material volumes where the dissipation actually occurs. It is also possible to separate and quantify the damping contributions from different damping sources. The interaction and combined effect of mixed material and interface damping is studied for a simple, three dimensional, build-up structure containing overlapping contact interfaces and internal regions with material damping. Results are presented based on damping measures which separate damping contributions from different contact interfaces and internal material volumes. By comparison of the total structural damping with partial contributions, from the specific damping sources occurring in each case, the combined, accumulated, effect of the different sources is investigated. The question whether different kinds of damping is additive or not is finally addressed.

Place, publisher, year, edition, pages
2010. 1193-1205 p.
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-82485ISI: 000302905400090ScopusID: 2-s2.0-84950977311ISBN: 978-90-73802-87-2OAI: diva2:498279
ISMA 2010, International Conference on Noise and Vibration Engineering, Leuven, Belgium, 20 - 22 September 2010
QC 20120420Available from: 2012-02-11 Created: 2012-02-11 Last updated: 2012-08-22Bibliographically approved

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Dovstam, KristerGöransson, Peter
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