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Multivariate Product Adapted Grading of Scots Pine Sawn Timber for an Industrial Customer, Part 2: Robustness to Disturbances
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0003-4530-0536
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2019 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 14, no 6, p. 420-427Article in journal (Refereed) Published
Abstract [en]

Holistic-subjective automatic grading (HSAG) of sawn timber by an industrial customer's product outcome is possible through the use of multivariate partial least squares discriminant analysis (PLS-DA), shown by part one of this two-part study. This second part of the study aimed at testing the robustness to disturbances of such an HSAG system when grading Scots Pine sawn timber partially covered in dust. The set of 308 clean planks from part one of this study, and a set of 310 dusty planks, that by being stored inside a sawmill accumulated a layer of dust, were used. Cameras scanned each plank in a sawmill's automatic sorting system that detected selected feature variables. The planks were then split and processed at a planing mill, and the product grade was correlated to the measured feature variables by partial least squares regression. Prediction models were tested using 5-fold cross-validation in four tests and compared to the reference result of part one of this study. The tests showed that the product adapted HSAG could grade dusty planks with similar or lower grading accuracy compared to grading clean planks. In tests grading dusty planks, the disturbing effect of the dust was difficult to capture through training.

Place, publisher, year, edition, pages
Taylor & Francis, 2019. Vol. 14, no 6, p. 420-427
Keywords [en]
Sawn timber, visual grading, customer adoption, discriminant analysis
National Category
Wood Science Other Mechanical Engineering
Research subject
Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-73854DOI: 10.1080/17480272.2019.1612944ISI: 000469741800001Scopus ID: 2-s2.0-85065546163OAI: oai:DiVA.org:ltu-73854DiVA, id: diva2:1313821
Funder
Vinnova, 2018-02749
Note

Validerad;2019;Nivå 2;2019-10-16 (johcin)

Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-10-16Bibliographically approved

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Olofsson, LinusBroman, OlofSkog, JohanFredriksson, MagnusSandberg, Dick
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