In-forest assessment of timber stiffness in Norway spruce (Picea abies (L.) Karst.)

Øvrum, Audun

doi:10.1007/s00107-013-0694-3

Cited by 13 publications

(2 citation statements)

References 23 publications

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“…129 Acoustic velocity has been reported to be related to slenderness (height/DBH). 139,245 It has been suggested that slenderness could be used for initial sorting of timber. Laser scanning of a log's surface to automatically measure the shape of a log in saw milling plants can also be utilized to measure slenderness and knots.…”

Section: Other Techniques Combined With Acoustic Tools For Measurimentioning

confidence: 99%

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Legg

Bradley

2016

The Journal of the Acoustical Society of America

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This paper provides a review on the use of acoustics to measure stiffness of standing trees, stems, and logs. An outline is given of the properties of wood and how these are related to stiffness and acoustic velocity throughout the tree. Factors are described that influence the speed of sound in wood, including the different types of acoustic waves which propagate in tree stems and lumber. Acoustic tools and techniques that have been used to measure the stiffness of wood are reviewed. The reasons for a systematic difference between direct and acoustic measurements of stiffness for standing trees, and methods for correction, are discussed. Other techniques, which have been used in addition to acoustics to try to improve stiffness measurements, are also briefly described. Also reviewed are studies which have used acoustic tools to investigate factors that influence the stiffness of trees. These factors include different silvicultural practices, geographic and environmental conditions, and genetics.

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Section: Other Techniques Combined With Acoustic Tools For Measurimentioning

confidence: 99%

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Legg

Bradley

2016

The Journal of the Acoustical Society of America

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“…Several studies (Lei et al 2005, Liu et al 2007, Haartveit and Flaete 2002, Øvrum 2013 have concluded that stem taper is an important variable when modelling MOE, MOR and grade yield.…”

Section: R a F Tmentioning

confidence: 99%

Modelling the variability of density and bending properties of Norway spruce structural timber

2016

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Density, modulus of elasticity (MOE), and bending strength (MOR) are important properties of structural timber, and knowledge about the variability of these properties is important to make efficient use of the timber. To utilize such information in the production of structural timber, the information must be available before sawing. This study presents models describing the variability of density and bending properties of Norway spruce (Picea abies L. Karst) boards within individual trees, as well as among trees and stands, based on geographical data and forest inventory data including external tree measurements. The models were based on 1551 boards from 17 sites in Southern Norway, Eastern Norway, and Trøndelag. Important variables describing variation in density, MOE, and MOR between sites were site index and elevation. For density, latitude gave additional information. Age, diameter at breast height, and longitudinal position within the tree were the most important variables at the tree level. The models explained major parts of the site variance of all properties, and for MOR, they explained a substantial part of the variance due to trees. In addition to being used for predicting the properties of structural timber from current forest resources, the models also provide information that can be used to predict the effects of silviculture on timber properties in future forest stands.

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Pre-sorting of Norway spruce structural timber using acoustic measurements combined with site-, tree- and log characteristics

et al. 2015

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In-forest assessment of timber stiffness in Norway spruce (Picea abies (L.) Karst.)

Cited by 13 publications

References 23 publications

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Measurement of stiffness of standing trees and felled logs using acoustics: A review

Modelling the variability of density and bending properties of Norway spruce structural timber

Pre-sorting of Norway spruce structural timber using acoustic measurements combined with site-, tree- and log characteristics

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