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The development of the measurement method for a structural intensity with with a K-space signal processing

Research Project

Project/Area Number 06452138
Research Category

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

Allocation TypeSingle-year Grants
Research Field Applied physics, general
Research InstitutionTokyo Institute of Technology

Principal Investigator

UEHA Sadayuki  Tokyo Inst.of Tech., Precision and Intelligence Lab., Professor, 精密工学研究所, 教授 (90016551)

Co-Investigator(Kenkyū-buntansha) FUJITA Hajime  Tokyo Inst.of Tehc., Precision and Inteligence Lab., Visited Professor, 精密工学研究所, 客員教授 (40251673)
KOIKE Yoshikazu  Tokyo Inst.of Tehc., Precision and Intteligence Lab., Research Associate, 精密工学研究所, 助手 (30251672)
NAKAMURA Kentaro  Tokyo Inst.of Tech., Precision and Intteligence Lab., Associate Professor, 大学院・総合理工学研究科, 講師 (20242315)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1995: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1994: ¥3,300,000 (Direct Cost: ¥3,300,000)
Keywordsstructural intensity / structural borne wave / spatial Fourier transofrm / k-space / k-space filter / flexural vibration / ultrasonic Doppler effect / optical vibration measurement / 空間フィルタ / 振動放射音
Research Abstract

The Purpose of this research is to establish the practical technique of structural intensity measurement. In this study, the k-space signal processing and ultrasonic Doppler vibrometer array for structural intensity measurement have been proposed. We have obtained the following results.
1.K-space method The derivation of structural intensity defined as vibration energy flow in solid structure contains the higher order spatial derivatives of displacement for flexural vibration. This calculation has a large effect on the measurement accuracy. In the proposed method, there are some merits that the spatial derivatives can be estimated only by the simple arithmetic in k-space using spatial Fourier transformation and that vibration noise can be reduced by k-space filtering. In order to avoid the loading effect on the specimen, a laser Doppler vibrometer was used which is one of the most promising candidates. We obtained the important result that the cutoff wave number for k-space filtering should be one and a half of the wave number of the measured vibration to minimize the influence of error in the measured data. This result was confirmed by the experiments for a beam and 2-dimensional plate.
2.Ultrasonic Doppler transducer array We proposed a new probe for structural intensity measurement using ultrasonic Doppler method. This probe is suitable to make a large array system, since the ultrasonic system is to easy handle and cheaper than the optical one and has no loading effect to specimens. The array probes for 1-dimensional and 2-dimensional measurements were made. The usable range of these array is 3 mm/s-1.0m/s at vibration frequency 1 kHz. The validity of the ultrasonic transducer array using Doppler effect is confirmed experimentally by the 1-dimensional and 2-dimensional structural intensity measurements.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] Ryusuke Morikawa: "Error Evaluation of the Structural Intensity Measured with a Scanning Laser Doppler Vibrometer and a K-space Signal Prosessing" The Journal of the Acoustical Society of America. (to be published).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa: "Ultrasonic Transducer Array for Structural Intensity Mments(to be published)" Japanese Journal of Applied Physics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa: "Structural Intensity Derivation Using Normal and In-Plane Vibration Displacements Measured By A Laser Doppler Vibrometer" Proceedings of Inter-Noise 95. 637-640 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kentaro Nakamura: "A Fiber Optic Vibrometer Array for Structural Intensity Measurements" Proceedings of Inter-Noise 95. 641-646 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa: "Experimental Study of K-Space Signal Processing for Structural Intensity Measurements" Proceedings of Inter-Noise 94. 1693-1696 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kentaro Nakamura: "Structural Intensity Measurements by an Optical Fiber Array Probe" Proceedings of Inter-Noise 94. 1689-1692 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa, kentaro Nakamura and Sadayuki Ueha: "Error Evaluation of the Structural Intensity Measured with a Scanning Laser Doppler Vibrometer and a K-space Signal Processing" The Journal of the Acoustical Society of America. vol.99 (to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa, Hidetoshi Yuzaki, Kentaro Nakamura and Sadayuki Ueha: "Ultrasonic transducer Array for Structural Intensity Measurements" Japanese Journal Applied Physics. Vol.36B (to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa, Kentaro Nakamura and Sadayuki Ueha: "Structural Intensity Derivation Using Normal and In-Plane Vibration Displacements Measured By A Laser Doppler Vibrometer" Proceedings of Inter-Noise 95. 637 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kentaro Nakamura, Sadayuki Ueha and Hajime Fujita: "A Fiber Optic Vibrometer Array for Structural Intensity Measurements" Proceedings of Inter-Noise 95. 641 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa, Kentaro Nakamura and Sadayuki Ueha: "Experimental Study of K-Space Signal Processing for Structural Intensity Measurements" Proceedings of Inter-Noise 94. 1693 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Kentaro Nakamura and Sadayuki Ueha: "Structural Intensity Measurements by and Optical Fiber Array Probe" Proceedings of Inter-Noise 94. 1689 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ryusuke Morikawa: "Error Evaluation of the Structural Intensity Measured with a Scanning Laser Doppler Vibrometer and a K-space Signal Processing (to be published)" The Journal of the Acoustical Society of America.

    • Related Report
      1995 Annual Research Report
  • [Publications] Ryusuke Morikawa: "Ultrasonic Transducer Array for Structural Intensity Mments (to be published)" Japanese Journal of Applied Physics.

    • Related Report
      1995 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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