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1990 Fiscal Year Final Research Report Summary

Development of Dynamic Portable Graders for Structural Lumber Using Tapping Method

Research Project

Project/Area Number 01860021
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 林産学
Research InstitutionNagoya University

Principal Investigator

SOBUE Nobuo  Nagoya Univ., Faculty of Agriculture, Josyu., 農学部, 助手 (50023495)

Co-Investigator(Kenkyū-buntansha) SASAKI Yasutosi  Nagoya Univ., Fac. Agriculture, Josyu., 農学部, 助手 (90154004)
TSUZUKI Kazuo  Nagoya Univ., Fac. Agriculture, Assoc. Prof., 農学部, 助教授 (60023438)
TAKEMURA Tomio  Nagoya Univ., Fac. Agriculture, Professor, 農学部, 教授 (90014919)
KIMURA Shiroh  Nagoya Univ., Fac. Agriculture, Assoc. Prof., 農学部, 助教授 (30023443)
Project Period (FY) 1989 – 1990
KeywordsPortable MOE grader / Tapping method / Longitidinal vibration / Flexural vibration / Structural lumber
Research Abstract

The object of this project was directed to the development of the portable dynamic graders which are used for the non-destructive strength evaluation of structural lumber.
1. The following systems were developed : (1) An automated high-speed system which was composed of an Fast Fourier Transformation (FFT) spectrum analyzer and a 16-bit personal computer, (2) A pocket Young's-modulus tester which was composed of a counter LSI and logic ICs, (3) An automated system which was composed of a 16-bit personal computer and a commercial A/D converter board, and (4) A system which was composed of a pocket computer and a commercial A/D converter board.
2. In situ application test of the automated system : The automated system using a FFT spectrum analyzer was transported to lumber mills and a forest-side log yard in order to examine the applicability and to obtain the data on the physical parameters of 2X4 lumber (S-P-F) and structural lumber of sugi and hinoki for the traditional Japanese wooden house. The maximum measuring speed was 100 pieces of lumber per an hour in the case of structural lumber. The rate-determining step of the measurement was the changing of specimens by human handling. In the case of logs, the weight measurement should be improved.
3. Numerical analysis of the flexural vibration theory of tapered beam was made to adopt the flexural vibration technique to logs by using the transfer matrix method. The results made the application of the vibration theory of the beam with homogeneous cross-section possible.
4. Knowledge base of the physical properties of structural timbers which was stored during in situ test was use to examine the algorism of the non-destructive strength prediction of structural timber. MOE prediction by the resonance frequency and the multiple regression model were studied.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 祖父江 信夫: "Correction Factors of the Resonance Frequency for Tapering and shear Deformation of a Log in Flexural Vibration" 日本木材学会誌. 36. 760-764 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 祖父江 信夫: "ポケットEテスタの開発" 木材工業. 45. 14-16 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 祖父江 信夫: "パソコンと市販のA/D変換ボ-ドを用いたヤング率測定" 木材工業. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 祖父江 信夫: "振動現象を利用した実大構造材の弾性率測定" 平成元年度文部省科学研究費(試験研究)資料, 57 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sobue, Nobuo: "Correction Factors of the Resonance Frequency for Tapering and Shear Deformation of a Log in Flexural Vibration." Mokuzai Gakkaishi. 36. 760-764 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sobue, Nobuo: "Development of a Pocket-E-tester." Wood Industry. 45. 14-16 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sobue, Nobuo: "MOE measurement of structural timbers by using vibration technique." As report of the Grant-in-Aid for Developmental Scientific Research B(2). (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sobue, Nobuo: Wood Industry. MOE measurement by using a personal computer and a Commercial A/D Converter Board.,

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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