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Feasibility of portable NIR spectrometer for quality assurance in glue-laminated timber production

https://research.thinkwood.com/en/permalink/catalogue2962
Year of Publication
2021
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Author
Sandak, Jakub
Niemz, Peter
Hänsel, Andreas
Mai, Juana
Sandak, Anna
Organization
University of Primorska
ETH Zurich
Bern University of Applied Sciences
Luleå University of Technology
Saxon University of Cooperative Education
Publisher
Elsevier
Year of Publication
2021
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Topic
Mechanical Properties
Keywords
Near Infrared Spectroscopy
Delamination
Quality Assurance
Research Status
Complete
Series
Construction and Building Materials
Summary
The feasibility of a portable NIR sensor for off-line determination of diverse wood quality aspects relevant in the production of glue-laminated timber was demonstrated. The best performance was noticed for assessing wood moisture content, with a lower capacity to estimate wood density and mechanical properties. NIR spectroscopy was modestly capable of predicting surface roughness. However, the traceability of the raw resources and the automatic classification of diverse wood defects were successfully demonstrated. The developed chemometric model could predict the total delamination and detailed delamination length. Finally, recommendations regarding further system development were provided with the aim of implementation and integration of the NIR measurement into glue-laminated timber production plants.
Online Access
Free
Resource Link
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Leveraging Structural Health Monitoring Data Through Avatars to Extend the Service Life of Mass Timber Buildings

https://research.thinkwood.com/en/permalink/catalogue3085
Year of Publication
2022
Author
Riggio, Mariapaola
Mrissa, Michael
Krész, Miklós
Vcelák, Jan
Sandak, Jakub
Sandak, Anna
Organization
Oregon State University
University of Primorska
University of Szeged
Czech Technical University in Prague
Year of Publication
2022
Format
Journal Article
Keywords
Mass Timber Building
Hygrothermal Monitoring
Avatars
Microclimate Data
Mold Risk Models
Research Status
Complete
Series
Frontiers in Built Environment
Summary
Mass timber construction systems, incorporating engineered wood products as structural elements, are gaining acceptance as a sustainable alternative to multi-story concrete or steel-frame structures. The relative novelty of these systems brings uncertainties on whether these buildings perform long-term as expected. Consequently, several structural health monitoring (SHM) projects have recently emerged to document their behavior. A wide and systematic use of this data by the mass timber industry is currently hindered by limitations of SHM programs. These limitations include scalability, difficulty of data integration, diverse strategies for data collection, scarcity of relevant data, complexity of data analysis, and limited usability of predictive tools. This perspective paper envisions the use of avatars as a Web-based layer on top of sensing devices to support SHM data and protocol interoperability, analysis, and reasoning capability and to improve life cycle management of mass timber buildings. The proposed approach supports robustness, high level and large-scale interoperability and data processing by leveraging the Web protocol stack, overcoming many limitations of conventional centralized SHM systems. The design of avatars is applied in an exemplary scenario of hygrothermal data reconstruction, and use of this data to compare different mold growth prediction models. The proposed approach demonstrates the ability of avatars to efficiently filter and enrich data from heterogeneous sensors, thus overcoming problems due to data gaps or insufficient spatial distribution of sensors. In addition, the designed avatars can provide prediction or reasoning capability about the building, thus acting as a digital twin solution to support building lifecycle management.
Online Access
Free
Resource Link
Less detail