Index of efficiency for strength-grading machines for solid wood
TypeArticles dans des revues avec comité de lecture
The settings of strength-grading machine for structural pieces of wood are checked according to the EN 14081 standard. However, different machines have different performances depending on the accuracy of the estimation of the board’s properties, and there is no easy way to compare the efficiency of these machines especially if the machine does not use the same sampling. In this paper, we introduce an index called index of efficiency for grading machines. This parameter is in the range of 0–100% and allows to compare performances of different machines for a given set of grades. The computation of this index is based on the cost matrix method of the EN 14081 and requires to have the size matrix of a setting to be computed.
Files in this item
Showing items related by title, author, creator and subject.
Evaluation of the visual stress grading standard on French Spruce (Picea excelsa) and Douglas-fir (Pseudotsuga menziesii) sawn timber ROBLOT, Guillaume; COUDEGNAT, Damien; BLERON, Laurent; COLLET, Robert (EDP Sciences, 2008)In this paper an evaluation of the visual grading standard for softwood sawn timber was made. • In order to do so, visual grading according to EN 518 and theoretical grading according to EN 338 and EN 384 (measurements of ...
HANNOUZ, Simon; COLLET, Robert; BUTAUD, Jean-Claude; BLÉRON, Laurent; CANDELIER, Kévin ("PRO LIGNO" Foundation, 2015)Heat treatment is an attractive method to enhance wood durability, and valorize local hardwood species with natural low durability. Yet no standard allows the certification of such products. This study first aims to observe ...
VIGUIER, Joffrey; JEHL, Arnaud; COLLET, Robert; BLERON, Laurent; MERIAUDEAU, Fabrice (Taylor & Francis, 2015)Timber strength grading has become a major issue in the European Union during the last years, due to the introduction of the Eurocode 5 and all its related standards. Currently, the most performing strength ...
BLERON, Laurent; DENAUD, Louis; COLLET, Robert; MARCHAL, Rémy (Lavoisier, 2011)Since the test method for compression strength perpendicular to the grain was changed from a partial area to a full area loading test, strength values for softwood in EN 338 were significantly reduced. Consequently, a ...
PAŁUBICKI, Bartosz; MARCHAL, Rémy; BUTAUD, Jean-Claude; DENAUD, Louis; BLERON, Laurent; COLLET, Robert; KOWALUK, Grzegorz (Springer-Verlag, 2010)In the present paper, a novel method for veneer checks measurement and description based on digital image analysis is evaluated. According to this method, the camera is located sideways to the veneer allowing for viewing ...