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

Gil-Moreno, David; Ridley-Ellis, Daniel

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.

Citation

Gil-Moreno, D., & Ridley-Ellis, D. (2015, September). Comparing usefulness of acoustic measurements on standing trees for segregation by timber stiffness. Presented at 19th International Nondestructive Testing and Evaluation of Wood Symposium, Rio de Janeiro, RJ, Brazil

• 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• Peer Reviewed: Not Peer Reviewed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