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On multilayered system dynamics and waves in anisotropic poroelastic media
KTH, Skolan för teknikvetenskap (SCI), Centra, VinnExcellence Center for ECO2 Vehicle design. KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet.ORCID-id: 0000-0003-2140-0479
2016 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The mechanical and acoustic anisotropy of media is a governing factor in the behaviour of multilayered systems including such media. The understanding of the mechanisms conditioning the dynamic behaviour of multilayered systems is of paramount importance. In particular, the intrinsic anisotropy of poroelastic media presents a potential for the optimal design of systems for multifunctional performances. Indeed, these multilayered systems are bound by stiffness, thermal and acoustic performance constraints in simultaneously. A plane wave method is presented to study the influence of material orientation in the dynamic behaviour of multilayered systems composed of anisotropic poroelastic media. The method is applied to a system composed of an anisotropic open-celled melamine foam core in between two metal sheets. This particular multilayered configuration allows to shed light on phenomena intrinsic to layers composed of anisotropic poroelastic materials, such as the frequency shift of the fundamental resonance of the panel, or the compression-shear coupling effects taking place in the poroelastic core layers. The latter phenomena is of particular importance, as it is evidenced on the unconventional polarisation of waves in anisotropic poroelastic media. Finally, the method is adapted to the optimisation of multilayered systems for acoustic performance. the design variables are consequently the core material orientations with respect to the global coordinate system. The solutions to the optimisation problem are analysed in terms of dynamic behaviour, thus allowing to correlate acoustic performance of the overall structure, and the response of each individual layer.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2016. , 57 s.
Serie
TRITA-AVE, ISSN 1651-7660 ; 2016:77
Nyckelord [en]
poroelastic media, anisotropy, plane waves, multilayered systems, dynamics, acoustics, optimisation
Nyckelord [fr]
matériaux poro-visco-élastique, anisotropie, ondes planes, panneaux multicouches, dynamique, acoustique, optimisation
Nyckelord [sv]
Poroelastiska material, anisotropi, planvågor, flerskiktssystem, dynamik, akustik, optimering
Nationell ämneskategori
Farkostteknik
Forskningsämne
Farkostteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-195801ISBN: 978-91-7729-172-5 (tryckt)OAI: oai:DiVA.org:kth-195801DiVA: diva2:1045470
Disputation
2016-12-06, F3, Lindstedtsvägen 26, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20161110

Tillgänglig från: 2016-11-10 Skapad: 2016-11-09 Senast uppdaterad: 2016-11-10Bibliografiskt granskad
Delarbeten
1. Acoustic analysis of anisotropic poroelastic multilayered systems
Öppna denna publikation i ny flik eller fönster >>Acoustic analysis of anisotropic poroelastic multilayered systems
2016 (Engelska)Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, ISSN 1089-7550, Vol. 119, nr 8, 084907- s.Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The proposed method allows for an extended analysis of the wave analysis, internal powers, and acoustic performance of anisotropic poroelastic media within semi-infinite multilayered systems under arbitrary excitation. Based on a plane wave expansion, the solution is derived from a first order partial derivative as proposed by Stroh. This allows for an in-depth analysis of the mechanisms controlling the acoustic behaviour in terms of internal powers and wave properties in the media. In particular, the proposed approach is used to highlight the influence of the phenomena intrinsic to anisotropic poroelastic media, such as compression-shear coupling related to the material alignment, the frequency shift of the fundamental resonance, or the appearance of particular geometrical coincidences in multilayered systems with such materials.

Ort, förlag, år, upplaga, sidor
American Institute of Physics (AIP), 2016
Nyckelord
Anisotropy, poroelastic materials, acoustic, mechanical waves, porous materials, acoustic waves
Nationell ämneskategori
Farkostteknik Teknisk mekanik Materialteknik
Forskningsämne
Teknisk materialvetenskap; Farkostteknik
Identifikatorer
urn:nbn:se:kth:diva-183351 (URN)10.1063/1.4942443 (DOI)000371601800038 ()2-s2.0-84959549758 (Scopus ID)
Anmärkning

QC 20160310

Tillgänglig från: 2016-03-07 Skapad: 2016-03-07 Senast uppdaterad: 2016-11-09Bibliografiskt granskad
2. Derivation of the state matrix for dynamic analysis of linear homogeneous media
Öppna denna publikation i ny flik eller fönster >>Derivation of the state matrix for dynamic analysis of linear homogeneous media
2016 (Engelska)Ingår i: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 140, nr 2, EL218-EL220 s.Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A method to obtain the state matrix of an arbitrary linear homogeneous medium excited by a plane wave is proposed. The approach is based on projections on the eigenspace of the governing equations matrix. It is an alternative to manually obtaining a linearly independent set of equations by combining the governing equations. The resulting matrix has been validated against previously published derivations for an anisotropic poroelastic medium.

Ort, förlag, år, upplaga, sidor
Acoustical Society of America (ASA), 2016
Nyckelord
Anisotropic media, Excited states, A-plane, Eigenspaces, Governing equations, Homogeneous media, Homogeneous medium, Linearly independents, Poroelastic medium, State matrices
Nationell ämneskategori
Annan maskinteknik
Forskningsämne
Teknisk mekanik
Identifikatorer
urn:nbn:se:kth:diva-190728 (URN)10.1121/1.4960624 (DOI)000383916100012 ()2-s2.0-84983405426 (Scopus ID)
Anmärkning

QC 20161014

Tillgänglig från: 2016-08-12 Skapad: 2016-08-12 Senast uppdaterad: 2016-11-09Bibliografiskt granskad
3. Wave analysis of intrinsic phenomena related to anisotropic poroelastic materials in multilayered systems
Öppna denna publikation i ny flik eller fönster >>Wave analysis of intrinsic phenomena related to anisotropic poroelastic materials in multilayered systems
Visa övriga...
2016 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

An analysis of intrinsic dynamic phenomena in anisotropic poroelastic media is presented, based on a plane wave formulation. The latter is derived from the Stroh formalism on the state variables governing the beha- viour of such media. A particular interest is given to the compression-shear coupling related to the material alignment of the anisotropic poroelastic core. This coupling motion can be directly correlated to the ma- terial mechanical parameters and affects the response of the overall structure in specific frequency ranges. Furthermore, the effect of the anisotropic poroelastic material coordinate orientation on the the acoustic and elastical response of multilayered systems with such material cores is investigated under diffuse field excita- tion conditions (i.e. only a part the mechanics which doesnt include maximum stress at rupture). An insight into other effects of anisotropy is provided, such as the frequency shift of the fundamental resonance related to the core material alignment and the appearance of particular geometrical coincidences in the acoustic behaviour of the system.

Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-192661 (URN)
Konferens
ISMA 2016 International Conference in Noise and Vibration Engineering and USD 2016 International Conference on Uncertainty in Structural Dynamics, Leuven, Belgium
Anmärkning

QC 20160923

Tillgänglig från: 2016-09-19 Skapad: 2016-09-19 Senast uppdaterad: 2016-11-09Bibliografiskt granskad
4. Optimal alignment of anisotropic poroelastic cores in multilayered systems for acoustic performance
Öppna denna publikation i ny flik eller fönster >>Optimal alignment of anisotropic poroelastic cores in multilayered systems for acoustic performance
2016 (Engelska)Artikel i tidskrift (Övrigt vetenskapligt) Submitted
Nationell ämneskategori
Teknisk mekanik
Identifikatorer
urn:nbn:se:kth:diva-195800 (URN)
Anmärkning

Qc 20161114

Tillgänglig från: 2016-11-09 Skapad: 2016-11-09 Senast uppdaterad: 2016-11-14Bibliografiskt granskad

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Parra Martinez, Juan Pablo
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