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Oförstörande provning av spånskivor med ultraljud- och egenfrekvensmetoder
1998 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In the production of particleboard, different properties of the board have to be measured in order to keep the board quality within required limits. Non-destructive methods for this purpose include ultra-sonic testing and eigen frequency testing. These methods have been proposed for mesuring of the strength of the board after pressing, for process control purposes. The ultra sound velocity and eigen frequency methods have been proved to be good instruments for doing this. The results show that Young's modulus and bending strength can be predicted with high accuracy with these methods. Internal bond can only be predicted with poor to fair accuracy with normal regression models. The use of multivariate models most often give better and more reliable models for Young's modulus and bending strength and gives much better predictions of the internal bond. Multivariate models are best suited for complex predictions and if the prediction variables are weak.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Particleboard, ultra sound, eigen frequency, non-destructive, testing
Keyword [sv]
URN: urn:nbn:se:ltu:diva-50152ISRN: LTU-EX--98/327--SELocal ID: 76e2b095-270e-46f8-9d6d-087df996b7ebOAI: diva2:1023509
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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