Acoustique et mécanique des matériaux poreux
The activities of the Acoustics and Mechanics of Porous Materials research group were initiated in the 80’s by the research of J. F. Allard (Professor at the University of Le Mans till he retired in 2011). Prof. J.F. Allard received the Biot medal in 2008 and the Decibel d’Or special price in 2011 for his contribution in the modeling of acoustic wave propagation in air saturated porous materials.
Nowadays, the activities of our group focus on the acoustics and dynamic behavior of sound absorbing complex materials, mostly involving porous materials saturated with air, but also some specific research is conducted on porous materials saturated by heavy fluids, like water (bone modeling, geophysics...).
The activities are organized around three topics which are highly interconnected :
- the characterization of the acoustic, non-acoustic, and mechanical properties of porous materials and sound absorbing materials
- the modeling either aimed at the development of models to describe the propagation of acoustic waves in porous materials in various frequency regimes, or aimed at the numerical modeling of acoustic waves in structures involving porous materials
- the design of new complex structures,inspired by metamaterials to enhance the absorption properties of acoustically absorbent materials
Positions currently available
The research group is currently looking for one PhD student in one of the following subjects :
- Modeling of sound propagation in fluid-solid porous metamaterials with rigid frame
- Natural materials for the absorption of audible sound (see announcement)
- Metaporous material for the absorption of audible sound (see announcement)
We are always pleased to invite and hire post-doctoral researchers who have skills in one or several of the research group domains.
Abilities in experimental studies are very welcome but we are also interested in theoretical and numerical skills.
Please do not hesitate to contact us for any further information.
Academic and technical staff :
- Bruno BROUARD (MCF)
- Bernard CASTAGNÈDE (Pr)
- Olivier DAZEL (MCF-HDR)
- Claude DEPOLLIER (Pr)
- Aroune DUCLOS (MCF)
- Jean-Philippe GROBY (CR CNRS), current leader of the research group
- Michel HENRY (MCF-HDR)
- Denis LAFARGE (CR CNRS)
- Stephane LEBON (AI CNRS)
- Sohbi SAHRAOUI (Pr)
- Vincent TOURNAT (CR CNRS-HDR)
- Navid NEMATI (ATER)
- C. Lagarrigue, Eco-metamaterials for wide band sound absorption, (2010-2013)
- J. P. Parra Martinez, Global acoustical thermal optimization methods for sound packages, International PhD cotutelle KTH – ECO2 Center, Sweden (2012-)
Former PhD Students (defence after 2010)
- A. Geslain (2008-2011), now post-doc at Leuven Measurement Systems
- N. Nemati (2009-2012), now ATER at the Université du Maine
- J. Prisutova, PhD student for the University of Bradford (UK) -4 months in 2013-
- A. Färn, PhD student from KTH- Royal Institute of Technology (Sweden) -3 months in 2012-
- O. Umnova, Senior Lecturer from the University of Salford (UK) -6 months in 2012/2013-
- K. Horoshenkov, Professor from the University of Bradford (UK) -1 month in2012-
The usual characterization procedures for the recovery of the acoustic and non acoustic parameters of the Johnson-Champoux-Allard model (flowmeter, standard diameter impedance tubes, ultrasounds) and of the mechanical parameters (rigidimeter) have been transfered to the acoustic group of CTTM.
The activities of the research group regarding the characterization of porous materials now focus on :
- the recovery of the Pride-Lafarge model parameters by use of a specially designed impedance sensor (see Figure 1) jointly developed by LAUM and CTTM. These parameters are particularly important for the low frequency modeling of the porous materials behavior. This work is conducted in collaboration with CTTM
- the characterization of the parameter profiles of macroscopically inhomogeneous porous materials. This work is conducted in collaboration with the University of Bradford
- the development of a specific set-up for the measurement of the reflection and absorption coefficients of sound absorbing materials with a single microphone
- the mechanical characterization of porous materials, in particular anisotropic and compressed foams, by use of the rigidimeter shown Figure 2. This work is conducted in collaboration with CTTM
- the mechanical characterization of porous materials by use of surface acoustic waves. This work is conducted in collaboration with the KULeuven and the Université de Bourgogne
Besides some of the widely used models to describe the acoustic propagation in air saturated porous materials developed at the Laboratory (Johnson-Champoux-Allard model or Pride-Lafarge model), the modeling of porous metamaterials is currently of particular importance. A nonlocal model accounting for both time and spatial dispersion of the acoustic propagation in acoustic metamaterials has been recently developed in the laboratory and is currently one of the most relevant ongoing work of the group on physical models.
Regarding numerical modeling of the acoustic wave propagation in structure involving porous materials various in-house codes have been developed :
- a stable Transfer Matrix Method, allowing for the simulation of the acoustic wave propagation in multilayer structures, involving alternatively elastic, poroelastic, equivalent fluid, or fluid layers has been recently developed. This method avoids crashes and divergence of the calculations sometimes encountered with TMM procedures as well as it benefits from a decreased number of unknowns compared with classical TMM
- some in-house Finite-Element code for the solution of the acoustic response of
- axisymmetric problems involving poroelastic materials, double porosity poroelastic materials
- periodic structures involving porous materials, see for example Figure 3
- a reformulation of the Biot theory (Dazel et al. 2007) that is suitable for numerical and semi-analytical calculations, see for example Figure 4
- reduced model techniques, which enable the calculations of the acoustic response of complex structures by a use of a judiciously chosen number of mode in each substructure that composed to whole complex structure, see for example Figure 5
- specific semi-analytical codes to solve multi-scattering problems
- developments of discontinuous Galerkin methods with plane waves for sound absorbing materials. This work is conducted in collaboration with the Institute of Sound and Vibration Research, University of Southampton (UK)
Classical sound absorbing porous materials suffer from a lack of absorption at low frequency, when compared to their efficiency at higher frequency. This is due to the intrinsic absorption mechanisms, which only rely on the viscous and thermal losses. To enhance the absorption of porous based complex structures, porous materials should be combined with volume or surface heterogeneities. The excitation of the resonances due to the presence of heterogeneities and/or to the resonant heterogeneities themselves induces a localization of the energy inside the structures and therefore an enhancement of absorption properties.
Several configurations are studied as a first step :
- resonant sonic crystals, possibly made of natural materials, for their abnormal transmission combining bandgaps due to periodicity with those associated to resonances of the scatterers, see Figure 6
- sonic crystals composed of non-circular cross section scatterers for their tunability as well as their ability to guide acoustic waves and perform multiplexing
- macroscopically inhomogeneous porous materials, either poroelastic or under the rigid frame approximation, for their ability to combine adaptation of the impedance between the porous material and the air medium with large absorption properties associated with increasing flow resistivity profiles. These research on graded porous materials are conducted in collaboration with the Université de Bourgogne and the University of Bradford
The second step consists of embedding inclusions, possibly resonant, inside porous materials, and possibly coupled with surface irregularities leading to metaporous materials. These metaporous materials present quite enhanced absorption properties. Sound absorption can be higher than 0.9 for wavelength 10 times larger than the thickness of the structures, see for example Figures 3 and 7. This research is conducted in collaboration with the University of Salford and Supmeca.
Some movies showing the snapshot of the pressure field inside the unit cell as a function of frequency along the absorption curve can be found on youtube in the case of :
- a 2 cm thick Fireflex foam with 3 circular inclusions and an irregularity of the rigid backing, here
- a 2.1 cm thick Melamine foam with periodic split-ring resonators embedded in with alternate orientations, here
- Acoustics and Thermal Physics, KULeuven, Belgium
- Department of Aeronautical and Vehicle Engineering, KTH Royal Institute of Technology, Sweden
- Center for sustainable development, University of Bradford, UK University of Salford, UK
- Institute of Sound and Vibration Research, University of Southampton, UK
- Laboratoire de Mécanique et d’Acoustique, Marseille, France
- The phononic group of IEMN, Lille, France
- The Center of Technology Transfer of Le Mans, France
- Supméca, Saint-Ouen, France
- Université de Bourgogne, ISAT, Nevers, France
- ENTPE, Vaulx en Velin, France
Defence (since 2010)
- A. Geslain (2011), Natural and induced anisotropy of porous materials : Experiments and modeling, download the PhD here
- N. Nemati (2012), Macroscopic theory of sound propagation in rigid-framed porous materials allowing for spatial dispersion : principle and validation
- O. Dazel (2011), Numerical methods for the Biot theory in acoustics, download the manuscript here
Award (since 2010)
- J.F. Allard, Decibel d’Or special price in 2011 for his contribution in the modeling of acoustic wave propagation in air saturated porous materials
Publications (since 2010)
- J.-P. Groby, E. Ogam, L. De Ryck, N. Sebaa, and W. Lauriks, Analytical method for ultrasonic characterization of homogeneous rigid porous materials from transmitted and reflected coefficients, Journal of the Acoustical Society of America, 127 : 764-772, 2010.
- J.-P. Groby, W. Lauriks, and T.E. Vigran, Total absorption peak by use of a rigid frame porous layer backed with a rigid multi-irregularities grating, Journal of the Acoustical Society of America, 127 : 2865-2874, 2010.
- O. Dazel, B. Brouardn N. Dauchez, A. Geslain, and CH Lamarque, A Free Interface CMS Technique to the Resolution of Coupled Problem Involving Porous Materials, Application to a Monodimensional Problem, Acta Acustica united with Acustica, 96 : 247-257, 2010.
- O. Dazel and V. Tournat, Nonlinear Biot waves in porous media with application to unconsolidated granular media, Journal of the Acoustical Society of America, 127 : 692-702, 2010.
- E. Ogam, C.Depollier, and Z.E.A. Fellah, The direct problem of acoustic diffraction of an audible probe radiation by an air-saturated porous cylinder, Journal of Applied Physics, 108 : 113519, 2010.
- E. Ogam, C.Depollier, and Z.E.A. Fellah, The direct and inverse problems of an air-saturated porous cylinder submitted to acoustic radiation, Review of Scientific instruments, 81 : 094902, 2010.
- E. Ogam, Z.E.A. Fellah, N. Sebaa, and J.-P. Groby, Non-ambiguous recovery of Biot poroelastic parameters of cellular panels using transmitted ultrasonic waves, Journal of Sound and Vibration, 330 : 1074-1090, 2011.
- J.-F. Allard, O. Dazel, G. Gautier, J.-P. Groby, and W. Lauriks, Prediction of sound reflexion by corrugated porous surfaces, Journal of the Acoustical Society of America, 129 : 1696-1706, 2011.
- J.-P. Groby, A. Duclos, O. Dazel, L. Boeckx, et W. Lauriks, Absorption of a rigid frame porous layer with periodic circular inclusions backed by a periodic grating, Journal of the Acoustical Society of America, 129 : 3035-3046, 2011.
- J. Descheemaeker, C. Glorieux, W. Lauriks, J.-P. Groby, L. Boeckx, and P. Leclaire, Study of circumfential waves on a layered poroelestic cylinder, Acta Acoustica united with Acustica, 97 : 734-743, 2011.
- A. Geslain, O. Dazel, S. Sahraoui, J.-P. Groby, and W. Lauriks, Influence of static compression on mechanical parameters of acoustic foams, Journal of the Acoustical Society of America, 130 : 818-825, 2011.
- G. Gautier, J.P. Groby, O. Dazel, L. Kelders, L. De Ryck, and P. Leclaire, Propagation of acoustic waves in a one-dimensional macroscopically inhomogeneous poroelastic material, Journal of the Acoustical Society of America, 130 : 1390-1398, 2011.
- M. Sadouki, M. Fellah, Z.E.A. Fellah, Z. E. A., E. Ogam, N. Sebaa, F.G. Mitri, and C. Depollier, Measuring static thermal permeability and inertial factor of rigid porous materials, Journal of the Acoustical Society of America, 130 : 2627-2630, 2011.
- J.-P. Groby, A. Duclos, O. Dazel, L. Boeckx, and L. Kelders, Enhancing absorption coefficient of a backed rigid frame porous layer by embedding circular periodic inclusions, Journal of the Acoustical Society of America, 130 : 3771-3780, 2011.
- J.-P. Groby, E. Ogam, A. Wirgin, et S. Xu, Recovery of material parameters of a soft elastic layer, Complex Variables and Elliptic Equations, 57 : 317-336, 2012.
- B. Nennig, Y. Renou, J.-P. Groby, and Y. Aurégan, A mode matching approach for modeling 2D porous grating with rigid or soft incluions, Journal of the Acoustical Society of America, 131 : 3841-3852, 2012.
- A. Geslain, J.-P. Groby, O. Dazel, S. Mahasaranon, K. V. Horoshenkov, and A. Khan, An application of the Peano series expansion to predict sound propagation in materials with continuous pore stratification, Journal of the Acoustical Society of America, 132 : 208-215, 2012.
- J.-P. Groby, O. Dazel, C. Depollier, E. Ogam, and L. Kelders, Scattering of acoustic waves by macroscopically inhomogeneous poroelastic tubes, Journal of the Acoustical Society of America, 132 : 477-486, 2012.
- H. Pichard O. Richoux, and J.-P. Groby, Experimental demonstrations in audible frequency range of band gap tunability and negative refraction in two-dimensional sonic crystal, Journal of the Acoustical Society of America, 132 : 2816-2822, 2012.
- O. Dazel, F. X. Becot, and L. Jaouen, Biot Effects for Sound Absorbing Double Porosity Materials, Acta Acustica united with Acustica, 98 : 567-576, 2012.
- J.B. Legland, V. Tournat, O. Dazel, A. Novak, and V. Gusev, Linear and nonlinear Biot waves in a noncohesive granular medium slab : Transfer function, self-action, second harmonic generation, Journal of the Acoustical Society of America, 131 : 4292-4303, 2012.
- C. Lagarrigue, J.-P. Groby, and V. Tournat, Sustainable sonic crystal made of resonating bamboo rods, Journal of the Acoustical Society of America, 133 : 247-254, 2013.
- J.-P. Groby, B. Brouard, O. Dazel, B. Nennig, and L. Kelders, Enhancing the absorption of a rigid frame porous layer by use of a rigid backing with three-dimensional periodic multi-irregularities, Journal of the Acoustical Society of America, 133 : 821-831, 2013.
- O. Dazel, J.-P. Groby, B. Brouard, and C. Potel, A stable method to model the acoustic response of multilayered structures, Journal of Applied Physics, 113 : 083506, 2013.
For additional information, please contact
email : Jean-Philippe.Groby univ-lemans.fr
Phone : +33 2 43 83 36 70