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Grading lumber with acoustic-based technologies Part 1: modeling acoustic (stress) wave behavior in clear wood and lumber

Christopher Adam Senalik, F. J.N. Franca, R. D. Seale, Robert J. Ross, R. Shmulsky

Abstract


This research article summarizes results from Part 1 of a study designed to examine using advanced signal processing techniques with acoustic-based lumber assessment technologies to evaluate the MOE, ultimate tension stress (UTS), and MOR of structural lumber. In Part 1 of this research article, a mathematical model of acoustic wave behavior in an idealized specimen is derived using fundamental mechanics. Published information on the physical and mechanical properties of clear, defect-free wood is input into the model to examine acoustic wave behavior. Wave behavior is then examined experimentally in a series of wood specimens. Observed wave behavior in the clear wood specimens, in both time and frequency domains, closely resembles idealized wave behavior. In Part 2 of this research article, predictions from the model are used to improve estimation of the UTS of wood specimens.

 


Keywords


wave model; frequency; clear wood; lumber; modulus of elasticity

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References


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