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Analysis of the frequency response behaviour of anisotropic multilayered structures and potential acoustic performance optimizations
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. LAUM - UMR CNRS.ORCID iD: 0000-0003-2140-0479
KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-1855-5437
LAUM - UMR CNRS.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0003-4503-4151
2014 (English)In: Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics, Leuven, Belgium: KU Leuven , 2014, 4279-4290 p.Conference paper, Published paper (Refereed)
Abstract [en]

Anisotropy of elastic and acoustic properties increases the potential for performance tailoring of multilayered structures including poroelastic materials. An intrinsic part of such a design optimization is to understand the frequency response behaviour of such configurations in general and those including anisotropic porous layers in particular. In this work a plane wave method for anisotropic multilayered structures has been used to study the response sensitivity for anisotropic porous materials as a function of their material coordinate orientation. It is shown that, depending on the frequency range of interest, the sensitivity to the orientation of the anisotropic porous material varies. 

Place, publisher, year, edition, pages
Leuven, Belgium: KU Leuven , 2014. 4279-4290 p.
Keyword [en]
anisotropy, acoustics, multilayered system, porous materials, transmission loss
National Category
Vehicle Engineering
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-147679ISI: 000352201005023Scopus ID: 2-s2.0-84913536439ISBN: 978-907380291-9 (print)OAI: oai:DiVA.org:kth-147679DiVA: diva2:746796
Conference
26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014, Leuven, Belgium, 15 September 2014 through 17 September 2014
Note

QC 20150512

Available from: 2014-09-15 Created: 2014-07-01 Last updated: 2015-05-12Bibliographically approved
In thesis
1. On the ECO2 multifunctional design paradigm and tools for acoustic tailoring
Open this publication in new window or tab >>On the ECO2 multifunctional design paradigm and tools for acoustic tailoring
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Nowadays vehicle design paradigm influences not only the effectiveness of the different means of transport, but also the environment and economy in a critical way. The assessment of the consequences that design choices have on society at large are necessary to understand the limits of the methods and techniques currently employed. One of the mechanisms set in motion is the planned obsolescence of products and services. This has affected vehicle design paradigm in such a way that the variety in the market has shadowed the primary function of vehicle systems: the transport of persons and goods. Amongst the consequences of the expansion of such market is the exponential rise on combustion emissions to the atmosphere, which has become a great hindrance for humans health and survival of ecosystems. The development of evaluation tools for such consequences and their piloting mechanisms is needed so as to implement an ECO2  (Ecological and Economical) vehicle design paradigm. Moreover, the multifunctional design paradigm that drives aeronautical and vehicle engineering is an ever-growing demand of smart materials and structures, able to fulfil multiple requirements in an effective way. The understanding of certain phenomena intrinsic to the introduction of novel materials has found certain limits due to the complexity of the models needed. This work presents as a first step an assessment of the causes and consequences of the vehicle exponential market growth based on the analysis of the planned obsolescence within. Furthermore, a method for the acoustic response analysis of multilayered structures including anisotropic poroelastic materials is introduced. The methodology consists in a plane wave approach as a base for introducing the complex mechanic and acoustic equations governing anisotropic homogeneous media, e.g. open-celled foams, into an alternative mathematical tool manipulating physical wave amplitudes propagation within the studied media. In addition, this method is coupled to a power partitioning and energetic assessment tool so as to understand the phenomena present in complex multilayered designs.

Place, publisher, year, edition, pages
Stockholm: Kungliga Tekniska högskolan, 2015. ii, 28 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2015:08
Keyword
vehicle design, planned obsolescence, anisotropy, porous materials, sound absorbing materials, acoustic modelling, power balance, energy assessment, dissipated power.
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-161209 (URN)978-91-7595-460-8 (ISBN)
Presentation
2015-03-31, B1 (02 tr), Brinellvägen 23, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20150323

Available from: 2015-03-24 Created: 2015-03-10 Last updated: 2015-04-01Bibliographically approved

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Parra Martinez, Juan PabloGöransson, PeterCuenca, Jacques

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