Design of calibrators for profile extrusion – optimizing multi-step systems / J. M. Nóbrega in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 331-338 Titre : Design of calibrators for profile extrusion – optimizing multi-step systems Type de document : texte imprimé Auteurs : J. M. Nóbrega, Auteur ; Olga. S. Carneiro, Auteur ; A. Gaspar-Cunha, Auteur ; N. D. Gonçalves, Auteur Année de publication : 2008 Article en page(s) : p. 331-338 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A computer code, that couples numerical modelling and optimization routines, is described and used to automatically optimize the performance of a multi-step calibration stage of a plastic profile extrusion line. The objective of the optimization process is to minimize two conflicting criteria: final plastic profile average temperature and corresponding distribution standard deviation, both computed at the end of the calibration/cooling stage. The optimization routine uses Multi-Objective Evolutionary Algorithms (MOEA). Having in mind the well-known difficulties in characterizing the interface heat transfer coefficient, the system optimization was performed using different constant values for this parameter. DOI : 10.3139/217.2148 En ligne : https://drive.google.com/file/d/173RTWrEOhBYcl-cXX3yLCgH4evrRCG__/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2635 [article]

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Using the GPU to design complex profile extrusion dies / N. D. Gonçalves in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 4 (08/2015) . - p. 442-450 Titre : Using the GPU to design complex profile extrusion dies Type de document : texte imprimé Auteurs : N. D. Gonçalves, Auteur ; S. P. Perreira, Auteur ; L. L. Ferras, Auteur ; J. M. Nóbrega, Auteur ; Olga. S. Carneiro, Auteur Année de publication : 2015 Article en page(s) : p. 442-450 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bois Calcul Cathéter Composites à fibres végétales Ecoulement laminaire Filières d'extrusion Matériel médical Processeur graphique Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : In the present work the benefits of using graphics processing units (GPU) to aid the design of complex geometry profile extrusion dies, are studied. For that purpose, a 3D finite volume based code that employs unstructured meshes to solve and couple the continuity, momentum and energy conservation equations governing the fluid flow, together with a constitutive equation, was used. To evaluate the possibility of reducing the calculation time spent on the numerical calculations, the numerical code was parallelized in the GPU, using a simple programing approach without complex memory manipulations. For verification purposes, simulations were performed for three benchmark problems: Poiseuille flow, lid-driven cavity flow and flow around a cylinder. Subsequently, the code was used on the design of two real life extrusion dies for the production of a medical catheter and a wood plastic composite decking profile. To evaluate the benefits, the results obtained with the GPU parallelized code were compared, in terms of speedup, with a serial implementation of the same code, that traditionally runs on the central processing unit (CPU). The results obtained show that, even with the simple parallelization approach employed, it was possible to obtain a significant reduction of the computation times. Note de contenu : - GOVERNING EQUATIONS AND NUMERICAL PROCEDURE : Code implementation - CPU and GPU implementations - CASE STUDIES : Benchmark problems and code verification - Design of profile extrusion dies DOI : 10.3139/217.2957 En ligne : https://drive.google.com/file/d/1WuJpuCW9PrsvJfJ_s0jPwg_fkeT5SZN3/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24853 [article]

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