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Dynamic stiffness of hollowed cylindrical rubber vibrationisolators: The wave-guide solution
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.ORCID iD: 0000-0001-5760-3919
(English)Article in journal (Other academic) Submitted
National Category
Applied Mechanics
URN: urn:nbn:se:kth:diva-95319OAI: diva2:527734
QS 2012Available from: 2012-05-22 Created: 2012-05-22 Last updated: 2012-05-22Bibliographically approved
In thesis
1. Modelling tools for quieter vehicles: Waves in poro– and visco–elastic continua
Open this publication in new window or tab >>Modelling tools for quieter vehicles: Waves in poro– and visco–elastic continua
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

New modelling tools intended to contribute to the development of components for quieter vehicles are developed. The tools are based on continuum models for wave propagation in poro– and visco–elastic media. By using geometric attributes of the studied components, the computational cost may be radically decreased compared to traditional methods. By assigning known analytical functions for one or two of the spatial directions, the spatial dimension of the remaining numerical problem is reduced. This reduction of spatial dimensions is performed in two di↵erent ways. The first one treats wave propagation in infinitely extended homogeneous and hollowed cylindrical rods, or wave guides, consisting of visco–elastic media. The wave solutions obtained are then used to model rubber vibration isolators of finite length by mode–matching the fields to the radial boundary conditions of interest. The second one is a method for modelling rotationally symmetric multilayered structures consisting of poro–elastic, elastic and fluid domains. By using a harmonic expansion for the azimuthal spatial dependence, the original three–dimensional problem is split up into several, much smaller, two– dimensional ones, radically decreasing the computational load.

Moreover, using a mixed measurement/modelling approach, the audible frequency range characteristics of a viscous damper from a truck is studied, illustrating the influence of the rubber bushings by which it is attached to surrounding structures.

The modelling approaches presented in this thesis are intended as tools aiding the design process of new vehicles, enabling new technology striving for more sustainable vehicle concepts. More specifically, the tools aim to improve the modelling of sound and vibration properties which are often penalised when seeking new, more sustainable vehicle designs.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. ix, 39 p.
Trita-AVE, ISSN 1651-7660 ; 2012:26
Vibro-acoutics, poro-elastic, visco-elastic, reduced models, Harmonic expansion, wave guide
National Category
Fluid Mechanics and Acoustics
urn:nbn:se:kth:diva-95205 (URN)978-91-7501-381-7 (ISBN)
Public defence
2012-06-07, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Centre for Eco2 Vehicle Design
TrenOp, Transport Research Environment with Novel Perspectives

QC 20120522

Available from: 2012-05-22 Created: 2012-05-16 Last updated: 2013-04-11Bibliographically approved

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Östberg, MartinKari, Leif
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