Multi-scale properties of acoustic materials SEMINAIRE ROBERVAL Modeling of multi-scale and multi-physical properties of acoustic materials Camille Perrot Laboratoire Modélisation et Simulation Multi Echelle (MSME), UMR 8208 CNRS Université Paris-Est Marne-la-Vallée 4 Juin 2015 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015 1
Multi-scale properties of acoustic materials OUTLINE Outline I. Administrative overview II. Overview of research activities III. Scientific focus on modeling real porous media IV. Conclusion and future works 2 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials OUTLINE Outline I. Administrative overview II. Overview of research activities III. Scientific focus on modeling real porous media IV. Conclusion and future works 3 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials I. ADMINISTRATIVE OVERVIEW A) Short CV Curriculum Vitae 38 years old Education: - Doctorat in Acoustics and PhD in Mechanical Engineering (2002-2006) Prepared at ENTPE [FR] and Université de Sherbrooke [QC, CA] Title: “ Micro-structure and acoustical macro-behavior: Approach by reconstruction of a representative elementary cell ” Advisors:Pr. R. Panneton [CA] Dr. X. Olny (co-advisor) [FR], Pr. J.-L. Guyader (co-advisor) [FR] - Master in Acoustics , Université Lyon 1, France (2002) - Bachelor in Applied Physics , Université Lille 1, France (2001) Professional experience: 2007 – 2008 - Postdoctoral researcher, Dpt. of Mech. Eng., Sherbrooke 2008 – … - Assistant professor (UPEM) 4 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials I. ADMINISTRATIVE OVERVIEW B) Publications and Services Publications o 12 papers in international referred journals o 1 chapter of book o 8 conferences given at the invitation of the organization committee in an international congress o 15 referred communications in international or national conferences University Services o Head of a master’s program specialized in project engineering, 2013-… o Responsible for the 1 st academic year at the ESIPE school of engineering, 2010-… o Mentor for one or two students in engineering each year (ESIPE), 2008-… Awards o Eligible for the research and doctoral supervision grants (PEDR), 2014-2017. 5 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials I. ADMINISTRATIVE OVERVIEW C) Supervised students Supervised students Supervised doctoral students 2009 – 2012: Minh Tan HOANG Co-advised with G. Bonnet [20%] “ Multi-scale and multi-physics modeling of the acoustical behavior of porous media: Application to the optimization of industrial foams ”. Financial Support: ANRT - Cifre Faurecia . Corresponding publications: 4 paper, 1 chapter of book, 10 communications. 2013 – 2016: Hoang Tuan LUU Co-advised with R. Panneton (QC) [50%] and V. Monchiet (FR) [15%] “ Multi-scale modeling of acoustic dissipation in technical textiles made of natural hollow fibers ” – Joint PhD Program Fr-Qc. Financial support: NSERC and FQRNT CA (100%). Corresponding publications: 1 paper, 1 communication. 2014 – 2017: Mu HE Co-advised with V. Monchiet [15%] “ Microstructure and acoustic properties of fibrous media: A deterministic multi-scale approach ”. Financial support: ADEME (50%), CSTB (25%), ISOVER (25%). Supervised Master students : 15 Master students 6 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials I. ADMINISTRATIVE OVERVIEW D) Contracts Contracts o 2009 – 2012: Collaborative research contract with FAURECIA ( PI ) “ Multi-scale and multi-physics modeling of the acoustical behavior of porous media: Application to the optimization of industrial foams ” o 2010 – 2012: Collaborative research contract with LAFARGE ( PI ) “ Acoustic properties of porous gypsum materials ” o 2014 – 2017: Scientific responsible for the acoustic part of ANR MatEtPro ProMap ANR : French National Research Agency MatEtPro : Materials and Process for Performing Products “ ProMap - Optimizing functional properties of particulate foams ” Collaboration with: Navier, Paris 7 University, Saint-Gobain Research o 2014 – 2017: Collaborative research contract with CSTB and ISOVER ( PI ) “ Microstructure and acoustic properties of fibrous media: A deterministic multi-scale approach ” 7 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials OUTLINE Outline I. Administrative overview II. Overview of research activities III. Scientific focus on modeling real porous media IV. Conclusion and future works 8 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials II. OVERVIEW OF RESEARCH ACTIVITIES 1) Determination from local geometry models of the acoustical macro-behavior of real porous media o Problem statement : determination of the acoustical properties of metallic foams by axial X-ray micro-computed tomography and numerical analysis o Difficulties : Identification of the REV Bridging the gap between a qualitative and quantitative description of the morphology (reconstruction artifacts) Frequency-dependent phenomena (descretization of the boundary layer) Fig. 2.1 Main steps of the reconstruction process by X-ray axial µCT 9 Camille PERROT, Habilitation defense, Université Paris-Est Marne-la-Vallée, December 11, 2014
Multi-scale properties of acoustic materials II. OVERVIEW OF RESEARCH ACTIVITIES 1) Determination from local geometry models of the acoustical macro-behavior of real porous media Results : Identification of PUCs representative of purely geometrical macroscopic parameters Computation of the dynamic bulk modulus from random walkers (3D) Computation of the dynamic viscous permeability (2D) Reconstruction of the frequency- dependent acoustic behavior Fig. 2.2 Results summary 10 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials II. OVERVIEW OF RESEARCH ACTIVITIES 2) Relations between microstructures and properties of sound absorbers o Purpose : devising micro-/macro relations, from the numerical tools and modeling techniques previously developed Absorption level Selectivity Weight reduction Fig. 2.2 Effect of the throat size in the range [20 µm – 210 µm] on the sound absorption coefficient 11 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials II. OVERVIEW OF RESEARCH ACTIVITIES 3) Modeling of heterogeneous poroelastic materials with a broad distribution of pore sizes o Problem statement : How to identify a representative volume element for heterogeneous poroelastic materials (PUC) ? Fig. 2.3 Velocity field magnitude [LF] (left) and electric field magnitude [HF] (right) for a porosity of 0.8. Black is zero, white is maximum. [Martys and Garboczi, PRB (1992)]. o Difficulties : The fluid flow paths are not the same according to frequency. Critical path ideas might be useful to tackle this problem 12 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials OUTLINE Outline I. Administrative overview II. Overview of research activities III. Scientific focus on modeling real porous media IV. Conclusion and future works 13 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials III. SCIENTIFIC FOCUS A) Transport properties Introduction o Context : determination of the acoustical properties from the microstructure o A long standing problem: [Rayleigh, 1945 (2 nd Ed.); Zwikker and Kosten, 1949; Attenborough, 1982; Allard and Atalla, 2009 (2 nd Ed)] o Aim . Get insight into the microstructure of real porous media and understand how it collectively dictates their macro-scale acoustic properties. o Method : Determine a unit cell suitable for representing the local geometry of a porous medium. Solve the partial differential equations in such a cell to obtain the parameters governing the physics at the upper scale. 14 Camille PERROT, Habilitation defense, Université Paris-Est Marne-la-Vallée, December 11, 2014
Multi-scale properties of acoustic materials III. SCIENTIFIC FOCUS A) Transport properties Direct static characterization of foam samples Microstructure characterization: characteristic shape measurements FIG. 3.1 Typical micrographs of real foam samples: (a) R 1 , (b) R 2 , (c) R 3 . Measurement of cell shape characteristics such as the average numbers of edges per face 15 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Multi-scale properties of acoustic materials III. SCIENTIFIC FOCUS A) Transport properties Direct static characterization of foam samples Microstructure characterization: characteristic size measurements FIG. 3.2 Ligament length distributions: R 1 (left), R 2 (middle), R 3 (right). 16 Camille PERROT, Séminaire Roberval, université de Technologie Compiègne, 4 juin 2015
Recommend
More recommend
