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Alignment of anisotropic poro-elasticlayers: Sensitivity in vibroacoustic response due to angular orientation of anisotropicelastic and acoustic properties
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-1855-5437
(English)Manuscript (preprint) (Other academic)
Identifiers
URN: urn:nbn:se:kth:diva-100704OAI: oai:DiVA.org:kth-100704DiVA: diva2:544547
Note

QS 2012

Available from: 2012-08-15 Created: 2012-08-15 Last updated: 2016-11-11Bibliographically approved
In thesis
1. A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels
Open this publication in new window or tab >>A study of tailoring acoustic porous material properties when designing lightweight multilayered vehicle panels
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present work explores the possibilities of adapting poro-elastic lightweight acoustic materials to specific applications. More explicitly, a design approach is presented where finite element based numerical simulations are combined with optimization techniques to improve the dynamic and acoustic properties of lightweight multilayered panels containing poro-elastic acoustic materials.

The numerical models are based on Biot theory which uses equivalent fluid/solid models with macroscopic space averaged material properties to describe the physical behaviour of poro-elastic materials. To systematically identify and compare specific beneficial or unfavourable material properties, the numerical model is connected to a gradient based optimizer. As the macroscopic material parameters used in Biot theory are interrelated, they are not suitable to be used as independent design variables. Instead scaling laws are applied to connect macroscopic material properties to the underlying microscopic geometrical properties that may be altered independently.

The design approach is also combined with a structural sandwich panel mass optimization, to examine possible ways to handle the, sometimes contradicting, structural and acoustic demands. By carefully balancing structural and acoustic components, synergetic rather than contradictive effects could be achieved, resulting in multifunctional panels; hopefully making additional acoustic treatment, which may otherwise undo major parts of the weight reduction, redundant.

The results indicate a significant potential to improve the dynamic and acoustic properties of multilayered panels with a minimum of added weight and volume. The developed modelling techniques could also be implemented in future computer based design tools for lightweight vehicle panels. This would possibly enable efficient mass reduction while limiting or, perhaps, totally avoiding the negative impact on sound and vibration properties that is, otherwise, a common side effect of reducing weight, thus helping to achieve lighter and more energy efficient vehicles in the future.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xi, 43 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:52
Keyword
porous material, optimization, Biot theory, acoustic wave propagation
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-100701 (URN)978-91-7501-448-7 (ISBN)
Public defence
2012-09-07, F3, Lindstedsvägen 26, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120815

Available from: 2012-08-15 Created: 2012-08-14 Last updated: 2013-04-11Bibliographically approved

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Göransson, Peter

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