Abstract
The aim of this study is to propose a method for measuring the mass of wood lumber in piles through a vibration test. Air-dried sitka spruce (Picea sitchensis Carr.) pieces with 1500–1600 mm length (L), 105 mm width (R), and 105 mm thickness (T) were used as specimens. We created a model of wood lumber inside a pile. A load 10 times that of the specimen was applied to the specimen, and vibration was initiated in the direction of the specimen’s length. The vibration test was conducted for the specimen with, and without a small steel plate. The specimen mass was estimated without weighing using the method based on the difference of the resonance frequency when a concentrated mass is added to and subtracted from wood. The specimen mass was thus estimated accurately through this vibration method. It is possible that the mass of the water removed from the wood lumber by drying can be estimated with this vibration method.
Highlights
In wood drying, the moisture content of wood lumber at the end of the drying process is very important
The purpose of this study is to determine whether bending vibration can be generated by tapping the cross section of the wood lumber inside the pile, and to determine whether this method for generating the bending vibration is effective to Vibration method with additional mass (VAM)
VAM was applied to wood lumber in the piled-lumber model and the specimen mass was estimated
Summary
The moisture content of wood lumber at the end of the drying process is very important. The moisture content of the wood lumber outside of the pile can be determined using a commercial moisture meter. It is difficult to measure the moisture content of the wood lumber inside the pile; moisture meters cannot be generally attached to the cross section of the wood lumber because they are not designed to measure the cross section, and the moisture content around the end of wood lumber is too low and not representative of the whole wood lumber. It is necessary to dismantle the pile and take the wood lumber from inside the pile out for weighing This process is labor-intensive and space is required to place the wood lumber when the pile is dismantled.
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