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A novel wave based prediction technique for the efficient dynamic modelling of poro-elastic materials
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2009 (English)In: 8th European Conference on Noise Control 2009, EURONOISE 2009 - Proceedings of the Institute of Acoustics, 2009, no PART 3Conference paper (Refereed)
Abstract [en]

The most commonly used prediction techniques to study the behaviour of poro-elastic materials are based on the finite element method (FEM). In the case of poro-elastic materials, certain material properties are frequency dependent. This implies that the system matrices have to be recalculated for each frequency, which is time consuming and disadvantageous for the method. As frequency increases, the model size increases drastically, such that these methods are restricted to low-frequency calculations. This paper presents a novel wave based prediction technique to solve the poro-elastic Biot wave equations in an efficient manner. wave functions that exactly satisfy the governing differential equations are used as an expansion set to describe the field variables. This leads to small model sizes and allows the method to be applied also at higher frequencies. The paper describes the basic concepts of the method and illustrates its potential through some dedicated two-dimensional validation calculations.

Place, publisher, year, edition, pages
2009. no PART 3
Keyword [en]
Basic concepts, Biot wave equations, Field variables, Finite element method FEM, Frequency dependent, Governing differential equations, Higher frequencies, Low frequency, Material property, Model size, Poroelastic materials, Prediction techniques, System matrices, Acoustic variables control, Differential equations, Finite element method, Forecasting, Elasticity
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-152032ScopusID: 2-s2.0-84864678568ISBN: 978-161567680-4OAI: diva2:749134
8th European Conference on Noise Control 2009, EURONOISE 2009; Edinburgh; United Kingdom; 26 October 2009 through 28 October 2009

QC 20140923

Available from: 2014-09-23 Created: 2014-09-23 Last updated: 2014-09-23Bibliographically approved

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Hörlin, Nils Erik
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