Letteratura scientifica selezionata sul tema "Fibres textiles – Propriétés acoustiques"
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Tesi sul tema "Fibres textiles – Propriétés acoustiques"
Luu, Hoang Tuan. "Modélisation multi-échelle de la dissipation acoustique dans des textiles techniques faits de fibres naturelles". Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1135/document.
Testo completoThis research project was inscribed in an eco-conception approach for architected materials with high acoustic potential. In this research project, we are interested particularly in the description of dissipation and propagation phenomena of sound waves in a fibrous medium by using multi-scale and multi-physics approaches. In this work, we determine the transport and acoustic properties of fiber media based on the description of geometry at their local scale. The fiber media consist of asclepias fibers which are typically vegetable fibers adopting a long hollow cylinder. To solve this problem, the methodology consists of 4 principle steps below: (i) Characterize and model the geometry of fiber medium; (ii) Calculate the transport parameters and acoustic properties of reconstructed fiber medium; (iii) Validate the results of the transport and acoustic properties by comparing with experimental measurements; (iv) Evaluate the evolution of transport parameters as function of geometrical parameters at the local scale. For the geometrical reconstruction, isotropic model of straight lines (Poisson processes) and angular orientation tensor were used. They allow representing of principle characteristics influencing the transport and acoustic properties of material at macroscopic scale. The resolutions of principal problems governing the acoustic behavior at the macroscopic scale were then performed by using the numerical homogenization method. We firstly demonstrate that the developed method allows predicting of absorption behavior of a random fiber medium based on only their geometrical characteristic description (porosity, fibers radius, angular orientation distribution) without adjustment coefficient, and the validated by experimental measurements. Secondly, based on the reconstruction method, one can systematically study the whole transport phenomena on a wide range of porosity and angular orientation in order to provide the laws which can be applied by other user on a wide range of real fiber media. Finally, we verify more particular the hypothesis that a fibrous material can be described by a mean diameter value of their fibers, this work allows identifying the limit of this approach and their application conditions when a fiber medium is constituted of a large distribution of fiber diameters or bimodal
Tran, Quang Vu. "Locally heterogeneous three-dimensional fibrous media : Representative elementary volumes and calculation of acoustic properties". Electronic Thesis or Diss., Université Gustave Eiffel, 2023. http://www.theses.fr/2023UEFL2081.
Testo completoThis thesis explores the complex relationship between the structures, acoustic properties, and manufacturing processes of non-woven fiber materials. Two families of composite fibrous media, derived from recycled textile fibers and recycled PET fibers, were studied, offering a diversity of polydispersity. Through microstructural characterization and numerical homogenization, this research identified key parameters associated with transport and sound absorption properties.The volume-weighted mean diameter Dv and inverse volume weighted mean diameter Div were found to be essential geometric descriptors. They explain acoustic behaviors at different frequencies, revealing that viscous and thermal exchanges occur through the widest channels of the microstructure at low frequencies; while at high frequencies, the acoustic signature is influenced by the entire microstructure, including the smallest constrictions.The original contributions of this research include (1) the development of Representative Elementary Volumes (REVs) for polydisperse fibrous media; (2) solving an optimization problem based on the degree of polydispersity; (3) and proposing an experimental technique to estimate transport properties at high frequencies.In summary, this thesis offers promising perspectives for understanding and optimizing the acoustic properties of polydisperse fibrous media while identifying crucial microstructural descriptors for these complex materials
Hallal, Ali. "Modélisation analytique généralisée des propriétés élastiques des composites textiles". Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0004.
Testo completoThe use of textile composites has increased recently in advanced industries to replace traditional composites and laminates. The prediction of elastic properties of textile composites presents an important step to understand the mechanical behavior of these materials. The objective of this thesis is to propose a reliable analytical model benefits from analytical methods advantageous against numerical methods. The proposed generalized model has been applied to all kinds of textile composites, where it yields very good results especially for the Young's modulus and shear plane. The thesis consists is a thesis by articles/publications. The thesis consists of eight chapters: Coordinating chapter, six chapters correspond to six publications and a general conclusion
Pac, Marie Jose. "Les surfaces textiles aux échelles micro, meso et macroscopiques : propriétés thermiques et tribologiques". Mulhouse, 2001. http://www.theses.fr/2001MULH0644.
Testo completoBrinkert, Luc. "Fibres creuses d'ultrafiltration : propriétés mécaniques et contrôle en ligne sur site de filage". Mulhouse, 1992. http://www.theses.fr/1992MULH0247.
Testo completoAdolphe, Dominique. "Contribution à l'étude de certaines propriétés physiques et hydrauliques de géotextiles". Mulhouse, 1990. http://www.theses.fr/1990MULH0140.
Testo completoSaïhi, Douha. "Modification de surface des fibres textiles par greffage chimique : Synthèse et caractérisation". Lille 1, 2003. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2003/50376-2003-297.pdf.
Testo completoSeurin, Marie-José. "Contribution à l'étude de propriétés statiques de polymères mésomorphes". Nice, 1985. http://www.theses.fr/1985NICE4061.
Testo completoVu, Thi Hong Khanh. "Etude de l'influence de la structure et de la texture des microfibres de PET sur leurs propriétés tinctoriales". Mulhouse, 1997. http://www.theses.fr/1997MULH0474.
Testo completoFreyburger, Jean-Marie. "Développement d'une méthodologie et d'un appareillage destinés au contrôle mécanique des textiles linéaires soumis à des sollicitations rapides". Mulhouse, 1990. http://www.theses.fr/1990MULH0141.
Testo completo