Classification of log based on sound analysis and its application for grading system and drying process control
| Project/Area Number |
63860021
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
林産学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ARIMA Takanori The University of Tokyo Faculty of Agriculture, Associate professor, 農学部, 助教授 (10144057)
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| Co-Investigator(Kenkyū-buntansha) |
TASHIRO Tadashi Co. Kawashima Kensetsu, Researcher, 開発研究員
GOSE Yutaka Co. Iida Kogyo, Researcher, 開発研究員
NAKAMURA Noboru The University of Tokyo, Faculty of Agriculture, Assistant Professor, 農学部, 助手 (30180384)
SHIDA Satoshi The University of Tokyo, Faculty of Agriculture, Assistant Professor, 農学部, 助手 (00201541)
MARUYAMA Norioshi Shizuoka University, Faculty of Agriculture Assistant Professor, 農学部, 助手 (10022253)
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| Project Period (FY) |
1988 – 1989
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| Project Status |
Completed (Fiscal Year 1989)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 1989: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1988: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | log / hitted sound / modulus of elasticity / mechanical grading / drying / glue-laminated lumber / laminae / Japanese cedar / 打撃音分析 / グレーディング / 固有振動数 / 木材乾燥 |
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| Research Abstract |
The modulus of elasticity (Et) of log was determined by measuring the natural frequency of longitudinal wave due to sound when hitting cross section. The Et of laminae and post-sized lumber with pith produced by the log were also measured. Results were as follows: (1) Et was recognized to be highly linear to the modulus of elasticity due to static bending test(Es).The third-term natural frequency of longitudinal wave was hardly affected by piling in stock yard as compared to the first or second ones,thus longitudinal wave sound analysis could be considered as a reasonable material selection and control system. (2) Since the Et of post-sized lumber and the average value of Et of laminae was recognized to be highly linear to Et of the original log, this rough classification of log could be useful in the selection of raw materials for structural lumber and glue-laminated lumber. (3) Since changing of natural frequency during drying process was affected by the increase of Et and weight loss due to desorption of water,it might be effective as rough quality control of drying within a well-known increase of Et. (4) In the glue-laminated lumber mill, the classification of log was conducted by longitudinal wave sound analysis. It could be efficient as a reasonable selection system for laminae.
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Report
(3 results)
Research Products
(7 results)
