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Damping Modelling in Complex Built-up Structures
DAIMLER AG.
DAIMLER AG.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-1855-5437
DAIMLER AG.
(English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568Article in journal (Other academic) Submitted
Abstract [en]

Damping in a given structure can be characterized and attributed to mechanisms like internal material dissipation and non material damping. While material damping is well understood and rather straightforward to model, the losses occurring at interfaces are less accessible and representable in simulations of realistic built-up body structures. Here, an approach based on linear modelling is discussed. The main objective of the work is to investigate the modelling of interface damping in a spot-welded structure by numerical simulations. Damping due to surface contact and movement of air through unsealed gaps is included. The results are promising in terms of the losses predicted for a realistic structure.

Keyword [en]
Interface damping, Surface contact damping, Structural damping, Air damping, Air pumping, Loss factor, Built-up structures, Finite element modelling.
National Category
Other Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-93779OAI: oai:DiVA.org:kth-93779DiVA: diva2:523828
Note
QS 2012Available from: 2012-04-26 Created: 2012-04-26 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Interface Damping: Characterization and Implementation
Open this publication in new window or tab >>Interface Damping: Characterization and Implementation
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Material damping in a structure is well defined and documented. However, dissipation due to mechanical contact (surface contact) in a complex built-up structure is not as well represented, in particular in large scale noise and vibration simulations. The present work is dealing with the understanding of the physical behaviour of losses that take place at such complex interfaces. The objective is to investigate, if, these mechanical loss phenomena can be modelled using linear response simulation techniques and implemented using commercially available finite element software. In a first step, the losses at the interfaces were experimentally investigated using an experimental setup capable of in-vacuo conditions. Following this, the second step was aimed at different ways of representing the proposed boundary conditions in a linear response simulation of a built-up structure. Two different approaches were studied, one using a continuous surface approach and one using a discrete element method.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. v, 25 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:13
National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Research subject
Järnvägsgruppen - Ljud och vibrationer
Identifiers
urn:nbn:se:kth:diva-93413 (URN)978-91-7501-289-6 (ISBN)
Presentation
2012-04-20, D41, Lindstedtsvägen 17, KTH, Stockholm, 13:15 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120424

Available from: 2012-04-24 Created: 2012-04-16 Last updated: 2013-04-11Bibliographically approved

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Göransson, Peter

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