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Stress Wave Vibration Method of Investigating the Properties of Standing Tree and Its Application on Growing Plantation Trees

Research Project

Project/Area Number 01480074
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionThe University of Tokyo

Principal Investigator

OKUMA Motoaki  Tokyo University Faculty of Agriculture Professor, 農学部, 教授 (80011906)

Co-Investigator(Kenkyū-buntansha) YAMANE Akiomi  Tokyo University Faculty of Agriculture Professor (Head of Chiba University Fore, 農学部, 教授 (30182588)
ARIMA Takanori  Tokyo University Faculty of Agriculture Associate Professor, 農学部, 助教授 (10144057)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1990: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsSugi / tree plantation / non-destructive inspection / forest thinnings / stress method / grading according to strength / standing tree / 丸太 / 樹幹 / 動的ヤング係数 / 製材品 / 木材利用
Research Abstract

In Japan, increasing production necessitates the utilization of coniferous tree plantation species. However, the utilizing groups' demands for quality logs and its efficient supply are under uncertain conditions or circumstances. If the quality of the material can be obtained while in the standing tree state, establishment of the cutting plans and the distribution of logs in the manufacturing line in the factory can be easily and properly executed. On this account, this experiment was conducted and the results for a 2-year period are summarized below.
1) It was verified that the quality (MOE) of the standing tree can be determined by measuring the velocity of stress wave propagation. It was considered that the density for all standing trees should be 0.80 g/cm^3. However, further investigation on the effects of density and moisture content are necessary.
2) Considering the above-mentioned method, the measured MOE values of ythe standing trees and processed materials were the same. The interdependence or the correlation between the values obtained from the standing trees and the dried materials was also high.
3) Based on the MOE obtained by means of the stress wave method, the cost assessment of the forest wood resources was tried.
4) Moreover, grading of standing tree according to strength in the utilization system of Sugi material is proposed. Results of this research is expected to be encouraged in the rational utilization of domestic wood resources.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 各波 直道・中村 昇・大熊 幹章: "立木・丸太材の振動によるヤング係数測定" 日本木材学会研究発表要旨集. 39. 4 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 名波 直道・中村 昇・有馬 孝礼: "立木・丸太材の弾性波の伝達経路" 日本木材学会研究発表要旨集. 40. 391 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 名波 直道・有馬 孝礼・大熊 幹章: "応力波による立木伐貭の測定法の開発とそれによる林分の評価" 東京大学農学部演習林報告. 88. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Naomichi Nanami, Noboru Nakamura and Motoaki Okuma.: "Measurement of the MOE of Standing Tree and Logs by Vibration Method." Japan Wood Research Society Symposium Paper Summary,. 39,. 4- (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Naomichi Nanami, Noboru Nakamura and Takanori Arima.: "Elastic Wave Propagation Path of Standing Trees and Logs." Japan Wood Research Society Symposium Paper Summary,. 40,. 391- (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] Naomichi Nanami, Takanori Arima and Motoaki Okuma.: "Development of Measuring Method of the Properties of Standing Trees and Logs by Stress Wave and Its Application on the Evaluation of Forest Wood Resources." Bulletin of the Tokyo University Forests,. 88,. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 名波 直道,中村 昇,大熊 幹章: "立木・丸太材の振動によるヤング系数測定" 日本木材学会研究発表要旨集. 39. 4 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] 名波 直道,中村 昇,有馬 孝礼: "立木・丸太材の弾性波の伝達経路" 日本木材学会研究発表要旨集. 40. 391 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 名波 直道,有馬 孝礼,大熊 幹章: "応力波による立木材質の測定法の開発とそれによる林分の評価" 東京大学農学部演習林報告. 83. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 名波直道・有馬孝礼: "立木・丸太材における応力波の伝播時間によるヤング率の測定" 木材学会誌. 36. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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