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Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness.

Gil-Moreno, David; Ridley-Ellis, Daniel

Authors

David Gil-Moreno



Contributors

Robert J Ross
Editor

Raquel Gon�alves
Editor

Xiping Wang
Editor

Abstract

The paper presents a comparison of standard procedures to measure acoustic stiffness of standing trees and logs. The aim is to see how useful they are for predicting the properties of dry, sawn, timber for the purposes of resource segregation in industrial practice. Stress wave time-of-flight (TOF) measurements were made on 36 trees of four species. The TOF data were analyzed and compared with resonant frequency measurements made on cut logs and sawn dry timber, and, as the ultimate measurement, static stiffness measured by four point bending tests. A simplified model of segregation is used to examine the relative performance of the methods to sort the better grade timber; in this case
defined by mean static bending stiffness. The research reveals that lengthening the TOF distance from 1 to 2 meters improves the performance for segregation in this case, particularly when segregating the higher stiffness proportion of the timber.

Presentation Conference Type Conference Paper (Published)
Conference Name 19th International Nondestructive Testing and Evaluation of Wood Symposium
Start Date Sep 22, 2015
End Date Sep 25, 2015
Publication Date 2015-09
Deposit Date Nov 5, 2015
Publicly Available Date Nov 5, 2015
Peer Reviewed Not Peer Reviewed
Pages 378-385
Book Title Proceedings: 19th International Nondestructive Testing and Evaluation of Wood Symposium
Keywords Resonance; time-of-flight; sawn dry timber; stiffness; grading; segregation; indicating property;
Public URL http://researchrepository.napier.ac.uk/id/eprint/9257
Contract Date Nov 5, 2015

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