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Numerical Modelling of Dynamics of Light Porous Materials

Göransson, Peter LU (1998)
Abstract
Porous materials are among the most commonly used materials for noise and vibration reduction in modern transportation vehicles. To design, industrially relevant, weight and cost effective noise and vibration measures, there is a need for general prediction models capable of representing the elasto-acoustic behaviour of such materials. The objective of the present work, is to contribute to the modelling of the inherent fluid-structure interaction phenomena related to porous materials. The modelling approach chosen allows for solution of problems having multiple layers of materials with complicated geometrical shapes and including effects of different boundary conditions along the interfaces to other fluid and solid materials.

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Porous materials are among the most commonly used materials for noise and vibration reduction in modern transportation vehicles. To design, industrially relevant, weight and cost effective noise and vibration measures, there is a need for general prediction models capable of representing the elasto-acoustic behaviour of such materials. The objective of the present work, is to contribute to the modelling of the inherent fluid-structure interaction phenomena related to porous materials. The modelling approach chosen allows for solution of problems having multiple layers of materials with complicated geometrical shapes and including effects of different boundary conditions along the interfaces to other fluid and solid materials.



To solve general three dimensional dynamic problems involving porous materials, a finite element formulation of Biot's equations, describing the fluid-structure interaction in porous materials is proposed. The resulting discrete equation systems, including coupling matrices to other fluid and solid materials, have symmetric matrices and are thus readily implemented into standard finite element software packages. Effects of viscous dissipation, thermal interaction, solid frame disspation and inertial coupling are taken into account. In addition, a finite element formulation of a simplified equivalent fluid model for low stiffness porous materials is proposed. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Professor Ohayon, Roger, Conservatoire National des Arts et Metiers (CNAM), 2 rue Conte, 75003 Paris, France
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Mechanical engineering, glass fibre, foam, material characterisation, elasto-acoustic, fluid-structure interaction, finite element, Biot, porous material, hydraulics, vacuum technology, vibration and acoustic engineering, Maskinteknik, hydraulik, vakuumteknik, vibrationer, akustik
pages
170 pages
publisher
Peter Göransson, FFA, PO Box 11021, SE-161 11 Bromma, Sweden.,
defense location
John Ericssons väg 1, room V:D
defense date
1998-12-14 10:15
external identifiers
  • other:ISRN: LUTVDG/(TVBA-1006)/1-170/(1998)
ISSN
0281-8477
language
English
LU publication?
yes
id
bfea0e97-a070-4d4e-95cc-dfafb7ad434a (old id 39207)
date added to LUP
2007-06-21 12:57:18
date last changed
2016-09-19 08:44:58
@phdthesis{bfea0e97-a070-4d4e-95cc-dfafb7ad434a,
  abstract     = {Porous materials are among the most commonly used materials for noise and vibration reduction in modern transportation vehicles. To design, industrially relevant, weight and cost effective noise and vibration measures, there is a need for general prediction models capable of representing the elasto-acoustic behaviour of such materials. The objective of the present work, is to contribute to the modelling of the inherent fluid-structure interaction phenomena related to porous materials. The modelling approach chosen allows for solution of problems having multiple layers of materials with complicated geometrical shapes and including effects of different boundary conditions along the interfaces to other fluid and solid materials.<br/><br>
<br/><br>
To solve general three dimensional dynamic problems involving porous materials, a finite element formulation of Biot's equations, describing the fluid-structure interaction in porous materials is proposed. The resulting discrete equation systems, including coupling matrices to other fluid and solid materials, have symmetric matrices and are thus readily implemented into standard finite element software packages. Effects of viscous dissipation, thermal interaction, solid frame disspation and inertial coupling are taken into account. In addition, a finite element formulation of a simplified equivalent fluid model for low stiffness porous materials is proposed.},
  author       = {Göransson, Peter},
  issn         = {0281-8477},
  keyword      = {Mechanical engineering,glass fibre,foam,material characterisation,elasto-acoustic,fluid-structure interaction,finite element,Biot,porous material,hydraulics,vacuum technology,vibration and acoustic engineering,Maskinteknik,hydraulik,vakuumteknik,vibrationer,akustik},
  language     = {eng},
  pages        = {170},
  publisher    = {Peter Göransson, FFA, PO Box 11021, SE-161 11 Bromma, Sweden.,},
  school       = {Lund University},
  title        = {Numerical Modelling of Dynamics of Light Porous Materials},
  year         = {1998},
}