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Estimation of Hydrodynamic Derivatives derived from Transient Manoeuvring Tests

Research Project

Project/Area Number 60850084
Research Category

Grant-in-Aid for Developmental Scientific Research

Allocation TypeSingle-year Grants
Research Field 船舶抵抗・運動性能・計画
Research InstitutionOSAKA UNIVERSITY

Principal Investigator

HAMAMOTO Masami  Osaka University, 工学部, 教授 (30107130)

Co-Investigator(Kenkyū-buntansha) HONDA Keinosuke  Kobe University of Mercantile Marine, 商船学部, 教授 (00031427)
TAGUCHI Katashi  Osaka Prefectural University, 工学部, 教授 (40081385)
TATANO Hisayoshi  Osaka University, 工学部, 助手 (00029042)
HASEGAWA Kazuhiko  Osaka University, 工学部, 講師 (60106804)
Project Period (FY) 1985 – 1986
Project Status Completed (Fiscal Year 1986)
Budget Amount *help
¥9,000,000 (Direct Cost: ¥9,000,000)
Fiscal Year 1986: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1985: ¥6,000,000 (Direct Cost: ¥6,000,000)
Keywordshydrodynamic derivatives / frequency dependency / transient response / impulsive response; causalty / 因果律 / Kramers-Kronigの関係 / 流体力 / 過渡運動 / 操縦性
Research Abstract

Hydrodynamic derivatives including the effect of frequency are estimated by means of transient manoeuvring tests. Planar motion mechanism (PMM) was used for this purpose, but partially changed to allow transient motions.
Utilising the Fourier analysis, linear derivatives are obtained in wide frequency range and they coincide with those derived from regular PMM tests. But the reliability of the results deeply depends on the characteristics of input transient motions and on the quality of measured forces. Then, the effect of maximum amplitude and time parameters applied to the transient motions are studied.
Each pairs of derivatives (e.g. added mass coefficient and damping coefficient) satisfied the Kramers-Kronig relationship in nature. First, Hilbert transform was applied to the experiment results, and the relationship was confirmed in general. But, there are unnegligible difference, because of the limitation in measured frequency range. Next, supposing the causal system, each transfer function is assumed to a rational function with a finite order of Hurwitz polynominal. If a proper set of coefficients in the transfer function is identified, we need no more to confirm the Kramers-Kronig relationship. Bode's diagram of the transfer function is used for parameter identification, and each experiment result is coincided with the transfer function very well.

Report

(2 results)
  • 1986 Final Research Report Summary
  • 1985 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 浜本剛実,長谷川和彦,小濱照彦: 日本造船学会論文集. 161. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] Masami HAMAMOTO;Kazuhiko HASEGAWA;Teruhiko KOHAMA: Technology Reports of the Osaka University. 37-2. (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] HAMAMOTO, Masami, HASEGAWA, Kazuhiko and KOHAMA, Teruhiko: "Estimation of Hydrodynamic Derivatives derived from Transient Moanoeuvring Tests" Journal of the Society of Naval Architects of Japan. 161. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary
  • [Publications] HAMAMOTO, Masami and HASEGAWA, Kazuhiko: "Frequency Dependency and Kramers-Kronig Relationship of Hydrodynamic Forces Acting on a Ship" Technology Reports of the Osaka University. 37-2. (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1986 Final Research Report Summary

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Published: 1987-03-31   Modified: 2016-04-21  

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