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Automatic computation of the knot area ratio for machine strength grading of Douglas-fir and Spruce timber / Guillaume Roblot in European journal of environmental and civil engineering, Vol. 14 N° 10 (Octobre 2010) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 14 N° 10 (Octobre 2010) . - pp. 1317-1332 Titre : Automatic computation of the knot area ratio for machine strength grading of Douglas-fir and Spruce timber Type de document : texte imprimé Auteurs : Guillaume Roblot, Auteur ; Laurent Bléron, Auteur ; Fabrice Mériaudeau, Auteur Année de publication : 2011 Article en page(s) : pp. 1317-1332 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Knot  area  ratio  Strength  grading  Optical  scanning  Structural  wood  MOR Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The knot area ratio (KAR) is well known to show good correlation with the strength of wood boards. However up to now no system was able to compute it automatically in order to use it in an industrial application. This paper introduces a new method which allows matching the knots from the 4 faces of wood boards. This method is based on the detection of knots by an optical scanner. The knots matching computation is validated through a complete study and tested over 451 structural lumbers (Douglas-fir (Pseudotsuga menziesii) and Spruce (Picea excelsa)). The correlation between the module of rupture and the KAR is also investigated on these samples, as well as the impact on the settings of grading machine (EN 14081).The study shows that coupling a scanner with a standard MOE measurement can significantly improve the grading results. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Automatic computation of the knot area ratio for machine strength grading of Douglas-fir and Spruce timber [texte imprimé] / Guillaume Roblot, Auteur ; Laurent Bléron, Auteur ; Fabrice Mériaudeau, Auteur . - 2011 . - pp. 1317-1332. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 10 (Octobre 2010) . - pp. 1317-1332 Mots-clés : Knot  area  ratio  Strength  grading  Optical  scanning  Structural  wood  MOR Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The knot area ratio (KAR) is well known to show good correlation with the strength of wood boards. However up to now no system was able to compute it automatically in order to use it in an industrial application. This paper introduces a new method which allows matching the knots from the 4 faces of wood boards. This method is based on the detection of knots by an optical scanner. The knots matching computation is validated through a complete study and tested over 451 structural lumbers (Douglas-fir (Pseudotsuga menziesii) and Spruce (Picea excelsa)). The correlation between the module of rupture and the KAR is also investigated on these samples, as well as the impact on the settings of grading machine (EN 14081).The study shows that coupling a scanner with a standard MOE measurement can significantly improve the grading results. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp