Technical Note: Velocity of Ultrasonic Waves in Live Trees and in Freshly-Felled Logs

Authors

  • Raquel Gonçalves
  • Cinthya Bertoldo Pedroso
  • Marcus Vinicius Massak
  • Fernando Batista
  • Chiara Barros Secco

Keywords:

Forest sector, acoustic evaluation, selection of trees

Abstract

The objective of this study was to evaluate variations between the velocity of ultrasonic wave propagation in trees and in freshly felled logs as well as to investigate the correlation between those speeds and corrections that would improve this correlation. The study was conducted using 210 exotic trees growing in Brazil, including the species Eucalyptus grandis, Pinus elliottii, Toona ciliata, and Eucalyptus resulting from cloning. Although the velocity of ultrasonic wave propagation in a tree (Vt) is not equal to that in a freshly felled log (Vt), the two values are correlated such that Vt can be obtained from Vst. The regression indicated a nonlinear equation for determining the log velocity from the tree velocity.

References

Moore J, Lyon A (2008) Effects of rotation length on the grade recovery and wood properties of Sitka spruce (Picea sitchensis) structural timber grown in Great Britain. Report of the Centre for Timber Engineering, Napier University, Edinburgh, UK.nWang X, Carter P, Ross RJ, Brashaw BK (2007a) Acoustic assessment of wood quality of raw forest materials—A path to increased profitability. Forest Prod J 57(5):6-14.nWang X, Ross RJ, Carter P, Harvey CH (2007b) Acoustic evaluation of wood quality in standing trees. Part I. Acoustic wave behavior. Wood Sci Technol 39(1):28-38.n

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Published

2011-05-13

Issue

Number 2 / April 2011

Section

Research Contributions

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