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Implementing Linear Modelling of Interface Damping in a Finite Element Software
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-1855-5437
(English)In: Finite elements in analysis and design (Print), ISSN 0168-874XArticle in journal (Other academic) Submitted
Abstract [en]

In the automotive industry virtual modelling of losses in a built-up structure is still a challenge. A body-in-white car structure consists of many spot-welded parts and the modelling of their associated losses is highly interesting. For this purpose, the dissipation of mechanical energy is here modelled in the frame of large scale computations using linear techniques with commercially available finite element software. Mechanical, vibration damping is introduced through external forces which are pairwise applied such that they oppose the relative motion at the contact interfaces between two parts. Two aspects are investigated, first if the proposed modelling captures the main mechanisms of the damping on a system level. Second, if the predicted local vibration responses at different locations correlate well between predicted and previously measured (in vacuo) spectra. Initial simulations show promising results and the level of damping observed in the predictions are similar to the measured spectra, fo rvibration shapes which involve significant relative motion along the spot-welded surfaces. An advantage with this technique is that it helps in understanding of different sources of total system damping, i.e. due to material and other sources of damping. It is verified that non-material damping due to mechanical contact is a significant contributor to the losses in a built-up structure which may be simulated with the proposed technique. In the paper the overall approach is discussed together with the specific aspects of the finite element implementation technique proposed.

Keyword [en]
Interface damping, Mechanical contact damping, Air damping, Air pumping, Material damping, Vibration reduction, Loss factor, Finite element method.
National Category
Other Mechanical Engineering
URN: urn:nbn:se:kth:diva-93781OAI: diva2:523832
QS 2012Available from: 2012-04-26 Created: 2012-04-26 Last updated: 2012-04-26Bibliographically 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.
Trita-AVE, ISSN 1651-7660 ; 2012:13
National Category
Vehicle Engineering Fluid Mechanics and Acoustics
Research subject
Järnvägsgruppen - Ljud och vibrationer
urn:nbn:se:kth:diva-93413 (URN)978-91-7501-289-6 (ISBN)
2012-04-20, D41, Lindstedtsvägen 17, KTH, Stockholm, 13:15 (English)
TrenOp, Transport Research Environment with Novel Perspectives

QC 20120424

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

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Nadampalli, Ravi V.Göransson, Peter
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