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Machine strength grading – “output control” as a method for production control
Linnaeus University, Faculty of Science and Engineering, School of Engineering. (Byggteknik)
2010 (English)In: Proceedings of the 11th World Conference on Timber Engineering, WCTE 2010, June 20-24, Riva del Garda, Italy, 2010Conference paper, (Refereed)
Abstract [en]

The paper describes the Output control method in EN 14081-3 as an alternative to the more common machine control method in EN 14081-2 for strength grading of timber. A newly developed program for analysing settings and varying input material is presented, as well as results from the analysis. If output control is used instead of machine control, it is possible to increase the yield, at the expense of making more proof-loading tests. The output control method can hardly catch a shift in input material quality, unless the shift stretches over several weeks. At present is the evaluation of the proof-loading results for MOR and MOE dependant of each other. If one of the properties goes out of control then both properties are evaluated according to the out-of-control procedure. This results in an inconsistent evaluation of the grading result. A pre-grading of logs gives a more reliable grading but results also in a lower yield.

Place, publisher, year, edition, pages
2010.
Keyword [en]
Cusum, EN14081, Machine strength grading, Output control, Standard
National Category
Building Technologies
Research subject
Technology (byts ev till Engineering), Civil engineering
Identifiers
URN: urn:nbn:se:lnu:diva-6667OAI: oai:DiVA.org:lnu-6667DiVA: diva2:328252
Conference
WCTE 2010
Available from: 2010-07-02 Created: 2010-07-02 Last updated: 2011-03-21Bibliographically approved

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