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Förhållandet mellan ultraljudshastigheten och fibervinkeln på stående hybridasp
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2016 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Relationship between ultrasonic velocity and spiral grain in standing hybrid aspen trees (English)
Abstract [en]

Wood anisotropic- and orthotropic properties and structure, entails a certain limitation regarding its final use. Its properties have there an important role, depending on what it will be used. In order to not decompose the material for the full quality determination, necessary alternative methods that can do the job without decomposition. One such method is the acoustic investigation by ultrasonic techniques. The method has been used in a variety of areas, the last few decades, so even in the wood industry. One question asked was whether the method can be used to examine the slope of grain angle under bark of the hybrid aspen. A comparison of an acoustic ultrasonic measurements and a manual measurement with a fiber angle measuring device with respect to the fiber angle, were made. The result was that some connection existed between fiber angle and the ultrasonic velocity. 

Place, publisher, year, edition, pages
2016. , 44 p.
Keyword [sv]
Ultraljudshastighet, akustisk mätning, fibervinkel, ortotropiskt, icke förstörande evaluation, icke förstörande teknik, elastisitetsmodul, densitet, fuktkvot, sortering, stående skog.
National Category
Engineering and Technology
URN: urn:nbn:se:lnu:diva-58347OAI: diva2:1050649
External cooperation
Emil Lagerqvist, Swedish Match Industries; Lars-Göran Stener, Skogforsk
Subject / course
Skogs- och träteknik
Educational program
Forest and Wood Engineering Programme, 180 credits
Available from: 2016-12-01 Created: 2016-11-29 Last updated: 2016-12-01Bibliographically approved

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Sjöberg, Samuel
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Department of Forestry and Wood Technology
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