Strength grading based on high resolution laser scanning: performance of a procedure newly approved for the European market
2015 (English)In: Proceedings of the 19th International Nondestructive Testing and Evaluation of Wood Symposium / [ed] Ross, Robert J.; Goncalves, Raquel; Wang, Xiping, Madison, USA: USDA, United States Department of Agriculture, Forest Service, Forest Products Laboratory , 2015, Vol. 19, 232-240 p.Conference paper (Refereed)
Strength grading of timber is necessary to ensure sufficient structural performance of the material, and machines based on different types of non-destructive measurements are available on the market. The purpose of this paper is to present results on an investigation of a new method and procedure for machine strength grading that is based on laser scanning and utilization of the tracheid effect, in combination with dynamic excitation and weighing. The investigated sample comprised more than 900 pieces of timber of Norway spruce (Picea abies) from Sweden, Norway and Finland. The coefficient of determination between the indicating property (IP) to bending strength and the measured bending strength was as high as R2 = 0.69, while the coefficient of determination between dynamic MOE and measured bending strength was R2 = 0.53. A comparison of the performance with what have been presented for machines that are based on X-ray in combination with dynamic excitation indicates that the new method/procedure will surpass such machines.
Place, publisher, year, edition, pages
Madison, USA: USDA, United States Department of Agriculture, Forest Service, Forest Products Laboratory , 2015. Vol. 19, 232-240 p.
, General Technical Report, FPL-GTR-329
grading, laser scanning, Norway spruce, strength class, structural timber, tracheid effect, yield
Research subject Technology (byts ev till Engineering), Civil engineering
IdentifiersURN: urn:nbn:se:lnu:diva-53348OAI: oai:DiVA.org:lnu-53348DiVA: diva2:937262
19th International Nondestructive Testing and Evaluation of Wood Symposium, Rio de Janeiro, Brazil, 23-25 September, 2015
FunderVINNOVA, 2011-03416Knowledge Foundation, 20110153