The Experts below are selected from a list of 4200 Experts worldwide ranked by ideXlab platform
Sigurdur Ormarsson - One of the best experts on this subject based on the ideXlab platform.
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influence of growth stresses and material properties on distortion of Sawn Timber numerical investigation
Annals of Forest Science, 2009Co-Authors: Marie Johansson, Sigurdur OrmarssonAbstract:Influence of growth stresses and material properties on distortion of Sawn Timber – Numerical investigation.
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Influence of growth stresses and material properties on distortion of Sawn Timber – numerical investigation
Annals of Forest Science, 2009Co-Authors: Marie Johansson, Sigurdur OrmarssonAbstract:Influence of growth stresses and material properties on distortion of Sawn Timber – Numerical investigation.
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a numerical study of the shape stability of Sawn Timber subjected to moisture variation part 3 influence of annual ring orientation
Wood Science and Technology, 2000Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:Numerical simulations were performed to investigate how the annual ring orientation affects the shape stability of Sawn Timber. The influence of radial variations in the basic properties and the spiral grain is also studied. The knowledge obtained can contribute to more effective use of the raw material through allowing boards having properties that would yield bad shape stability to be sorted out. Possibilities for improving shape stability through gluing pieces of wood together are examined as well.
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Stiffness, strength and shape stability grading analysis of Sawn Timber based on experimentally found growth characteristics
2000Co-Authors: Ola Dahlblom, Hans Petersson, Sigurdur OrmarssonAbstract:Stiffness, strength and shape stability analysis of Sawn Timber should be based on how the material properties vary in the stem due to different growth conditions. As part of an EU study, results from investigations of the modulus of elasticity, shrinkage coefficient and spiral grain angle of spruce are presented. The variation in properties with the position in the stem has been investigated. The specimens were Sawn from 274 stems in 29 stands in five countries of the European Union. A total of about 7000 small specimens were tested. Results from the modelling of stiffness and moisture-induced deformations of battens are presented. The simulations were based on material data obtained from measurements performed on specimens Sawn from the same logs as the battens. The simulation results are compared with experimental results and are of interest for the development of new grading procedures for Sawn Timber.
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A numerical study of the shape stability of Sawn Timber subjected to moisture variation. Part 2 : Simulation of drying board
Wood Science and Technology, 1999Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:A theory for analysing the shape stability of Sawn Timber was implemented in a finite element program. To illustrate the types of results that can be obtained, the behaviour of a board during drying was simulated. The simulation yields information about unfavourable deformations and stresses during the drying process. To investigate factors that influence drying deformations, a parameter study was performed in which the influence of different constitutive models and different material parameters was studied. In addition, the influence of the spiral grain angle was examined.
Hans Petersson - One of the best experts on this subject based on the ideXlab platform.
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a numerical study of the shape stability of Sawn Timber subjected to moisture variation part 3 influence of annual ring orientation
Wood Science and Technology, 2000Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:Numerical simulations were performed to investigate how the annual ring orientation affects the shape stability of Sawn Timber. The influence of radial variations in the basic properties and the spiral grain is also studied. The knowledge obtained can contribute to more effective use of the raw material through allowing boards having properties that would yield bad shape stability to be sorted out. Possibilities for improving shape stability through gluing pieces of wood together are examined as well.
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Stiffness, strength and shape stability grading analysis of Sawn Timber based on experimentally found growth characteristics
2000Co-Authors: Ola Dahlblom, Hans Petersson, Sigurdur OrmarssonAbstract:Stiffness, strength and shape stability analysis of Sawn Timber should be based on how the material properties vary in the stem due to different growth conditions. As part of an EU study, results from investigations of the modulus of elasticity, shrinkage coefficient and spiral grain angle of spruce are presented. The variation in properties with the position in the stem has been investigated. The specimens were Sawn from 274 stems in 29 stands in five countries of the European Union. A total of about 7000 small specimens were tested. Results from the modelling of stiffness and moisture-induced deformations of battens are presented. The simulations were based on material data obtained from measurements performed on specimens Sawn from the same logs as the battens. The simulation results are compared with experimental results and are of interest for the development of new grading procedures for Sawn Timber.
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A numerical study of the shape stability of Sawn Timber subjected to moisture variation. Part 2 : Simulation of drying board
Wood Science and Technology, 1999Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:A theory for analysing the shape stability of Sawn Timber was implemented in a finite element program. To illustrate the types of results that can be obtained, the behaviour of a board during drying was simulated. The simulation yields information about unfavourable deformations and stresses during the drying process. To investigate factors that influence drying deformations, a parameter study was performed in which the influence of different constitutive models and different material parameters was studied. In addition, the influence of the spiral grain angle was examined.
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Stiffness and shape stability analysis of Sawn Timber based on experimentally found variations of wood properties
1999Co-Authors: Ola Dahlblom, Sigurdur Ormarsson, Kent Persson, Hans PeterssonAbstract:Stiffness and shape stability analysis of Sawn Timber based on experimentally found variations of wood properties
Dick Sandberg - One of the best experts on this subject based on the ideXlab platform.
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The Effect of Class-balance and Class-overlap in the Training Set for Multivariate and product-adapted Grading of Scots Pine Sawn Timber
Wood Material Science & Engineering, 2020Co-Authors: Linus Olofsson, Olof Broman, Johan Oja, Dick SandbergAbstract:Using multivariate partial least squares regression (PLS) to perform visual quality grading of Sawn Timber requires a training set with known quality grades for the training of a grading model. Thi ...
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multivariate product adapted grading of scots pine Sawn Timber for an industrial customer part 1 method development
Wood Material Science and Engineering, 2019Co-Authors: Linus Olofsson, Olof Broman, Johan Skog, Magnus Fredriksson, Dick SandbergAbstract:Rule-based automatic grading (RBAG) of Sawn Timber is a common type of sorting system used in sawmills, which is intricate to customise for specific customers. This study further develops an automa...
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Multivariate Product Adapted Grading of Scots Pine Sawn Timber for an Industrial Customer, Part 2 : Robustness to Disturbances
Wood Material Science and Engineering, 2019Co-Authors: Linus Olofsson, Olof Broman, Johan Skog, Magnus Fredriksson, Dick SandbergAbstract:Holistic-subjective automatic grading (HSAG) of Sawn Timber by an industrial customer's product outcome is possible through the use of multivariate partial least squares discriminant analysis (PLS-...
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Customer adapted grading of Scots pine Sawn Timber : a multivariate method approach
2017Co-Authors: Linus Olofsson, Olof Broman, Johan Skog, Magnus Fredriksson, Dick SandbergAbstract:At Scandinavian softwood sawmills, the most common system for grading of Sawn Timber in dry conditions is optical scanning equipment together with a rule-based automatic grading system (RBAG). The ...
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Radially Sawn Timber—the Primwood Method for improved properties
Holz als Roh- und Werkstoff, 2005Co-Authors: Dick SandbergAbstract:A new manufacturing system, the PrimWood Method, has been proposed to improve the utilization of wood. A basic concept within this method is the sawing pattern called star-sawing, which produces Timber with both rectangular and triangular cross sections. This method facilitates an efficient production of radially Sawn Timber with vertical annual rings, without juvenile wood. The Sawn Timber produced in the PrimWood Method is used to produce high quality, knot-free solid wood panels with vertical annual rings. In this process, part of the Timber is finger-jointed to form knot-free lengths which are glued together into a block. This block can then be divided according to thickness into thinner panels with vertical annual rings. The PrimWood Method has been tested in an industrial plant. The manufacturing system was designed for a sawing capacity of about 30,000 m3 logs, which corresponds to 16,800 m3 of star-Sawn Timber per shift per annum. The production of solid wood panel was then designed to give a volume of 5,800 m3 per annum.
Ola Dahlblom - One of the best experts on this subject based on the ideXlab platform.
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a numerical study of the shape stability of Sawn Timber subjected to moisture variation part 3 influence of annual ring orientation
Wood Science and Technology, 2000Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:Numerical simulations were performed to investigate how the annual ring orientation affects the shape stability of Sawn Timber. The influence of radial variations in the basic properties and the spiral grain is also studied. The knowledge obtained can contribute to more effective use of the raw material through allowing boards having properties that would yield bad shape stability to be sorted out. Possibilities for improving shape stability through gluing pieces of wood together are examined as well.
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Stiffness, strength and shape stability grading analysis of Sawn Timber based on experimentally found growth characteristics
2000Co-Authors: Ola Dahlblom, Hans Petersson, Sigurdur OrmarssonAbstract:Stiffness, strength and shape stability analysis of Sawn Timber should be based on how the material properties vary in the stem due to different growth conditions. As part of an EU study, results from investigations of the modulus of elasticity, shrinkage coefficient and spiral grain angle of spruce are presented. The variation in properties with the position in the stem has been investigated. The specimens were Sawn from 274 stems in 29 stands in five countries of the European Union. A total of about 7000 small specimens were tested. Results from the modelling of stiffness and moisture-induced deformations of battens are presented. The simulations were based on material data obtained from measurements performed on specimens Sawn from the same logs as the battens. The simulation results are compared with experimental results and are of interest for the development of new grading procedures for Sawn Timber.
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A numerical study of the shape stability of Sawn Timber subjected to moisture variation. Part 2 : Simulation of drying board
Wood Science and Technology, 1999Co-Authors: Sigurdur Ormarsson, Ola Dahlblom, Hans PeterssonAbstract:A theory for analysing the shape stability of Sawn Timber was implemented in a finite element program. To illustrate the types of results that can be obtained, the behaviour of a board during drying was simulated. The simulation yields information about unfavourable deformations and stresses during the drying process. To investigate factors that influence drying deformations, a parameter study was performed in which the influence of different constitutive models and different material parameters was studied. In addition, the influence of the spiral grain angle was examined.
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Stiffness and shape stability analysis of Sawn Timber based on experimentally found variations of wood properties
1999Co-Authors: Ola Dahlblom, Sigurdur Ormarsson, Kent Persson, Hans PeterssonAbstract:Stiffness and shape stability analysis of Sawn Timber based on experimentally found variations of wood properties
Jan Oscarsson - One of the best experts on this subject based on the ideXlab platform.
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Prediction of tensile strength of Sawn Timber: definitions and performance of indicating properties based on surface laser scanning and dynamic excitation
Materials and Structures, 2020Co-Authors: Andreas Briggert, Anders Olsson, Jan OscarssonAbstract:The presence of wood irregularities such as knots are decisive for the mechanical properties of Sawn Timber, and efficient utilisation of Timber requires methods by which grade determining properti ...
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Prediction of tensile strength in Sawn Timber by means of surface laser scanning and dynamic excitation
2019Co-Authors: Andreas Briggert, Anders Olsson, Jan OscarssonAbstract:Prediction of tensile strength in Sawn Timber by means of surface laser scanning and dynamic excitation
