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A study on a marine autopilot with the function of roll dumping for a small boat

Research Project

Project/Area Number 16560705
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Naval and maritime engineering
Research InstitutionToyama National College of Maritime Technology

Principal Investigator

NAKATANI Toshihiko  Toyama National College of Maritime Technology, Dept.of Maritime Technology, Associate Professor, 商船学科, 助教授 (30249776)

Co-Investigator(Kenkyū-buntansha) ENDO Makoto  Toyama National College of Maritime Technology, Dept.of Maritime Technology, Professor, 商船学科, 教授 (40149919)
YAMAMOTO Keiichiro  Toyama National College of Maritime Technology, Dept.of Maritime Technology, Lecturer, 商船学科, 講師 (40321418)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2005: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2004: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordsautopilot / rudder roll stabilize / statistical analysis / noise contribution / AR model / AIC / optimal control
Research Abstract

A ship is equipped with an autopilot system to keep the ship's course constant. However, when operating in rough seas, since the course fluctuates considerably because of the roll motion caused by sea conditions, it must be helped very much to have a comfortable navigation if fluctuations of both of the course and the roll can be reduced at a time by controlling the rudder. There are few cases analyzing the relationship between a course-keeping system and the roll motion quantitatively on a small boat.
Firstly, the navigational system was upgraded and the experiment was carried out so that a random white noise signal was added to the rudder order signal to identify system dynamics. In order to analyze experimental data, a Multi-variate Auto Regressive (MAR) model was fitted to the recorded data using the minimum AIC estimate procedure. From the estimated MAR model, useful tools for the statistical analysis, such as a power spectrum, noise contribution and so on, could be obtained. As a result of the analysis, it was made clear that fluctuation of the roll was strongly influenced by the rudder.
Secondly, a new controller was designed, based on the information obtained from the analysis. This is a new type of autopilot which orders a control signal to the steering gear taking the roll motion into consideration. The new autopilot was designed using a modern control theory under a quadratic performance function with various weighting coefficients. Digital simulations were executed to evaluate the designed controller in order to make certain that the new type of autopilot functioned as designed. As a result of simulations, the new system had good performance compared with the original data.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (9 results)

All 2005 2004

All Journal Article (9 results)

  • [Journal Article] Dynamics Analysis of a Small Training Boat ant Its Optimal Control2005

    • Author(s)
      Toshihiko Nakatani, Makoto Endo, Keiichiro Yamamoto, Taishi Kanda
    • Journal Title

      Proceedings of ICCAS (International Conference on Control, Automation, and Systems) 2005

      Pages: 342-345

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 小型船舶のデータ処理装置について2005

    • Author(s)
      中谷俊彦
    • Journal Title

      富山商船高等専門学校研究収録 第38号

      Pages: 17-22

    • NAID

      40007073475

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] クルーザ型小型船舶の動特性推定について2005

    • Author(s)
      中谷俊彦, 遠藤真, 山本桂一郎, 神田大志
    • Journal Title

      平成17年度電気関係学会北陸支部連合大会講演論文集

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Onboard Data-Processing System Installed on a Small Training Boat2005

    • Author(s)
      Toshihiko Nakatani
    • Journal Title

      Research Studies of Toyama National College of Maritime Technology

      Pages: 17-22

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] On the estimation of dynamics of a small boat2005

    • Author(s)
      Toshihiko Nakatani, Makoto Endo, Keiichiro Yamamoto, Taishi Kanda
    • Journal Title

      Proceedings of the 2005 Joint Conference of Hokuriku Chapters of Electrical Societies H11

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dynamics Analysis of a Small Training Boat ant Its Optimal Control2005

    • Author(s)
      Toshihiko Nakatani, Makoto End, Keiichiro Yamamoto, Taishi Kanda
    • Journal Title

      Proceedings of ICCAS (International Conference on Control, Automation, and Systems) 2005

      Pages: 342-345

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 小型船船のデータ処理装置について2005

    • Author(s)
      中谷俊彦
    • Journal Title

      富山商船高等専門学校研究収録 第38号

      Pages: 17-22

    • Related Report
      2005 Annual Research Report
  • [Journal Article] クルーザ型小型船舶のシステム化について2004

    • Author(s)
      中谷俊彦, 遠藤真, 山本桂一郎
    • Journal Title

      平成16年度電気関係学会北陸支部連合大会講演論文集

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary 2004 Annual Research Report
  • [Journal Article] On the modernization of a small training boat2004

    • Author(s)
      Toshihiko Nakatani, Makoto Endo, Keiichiro Yamamoto
    • Journal Title

      Proceedings of the 2004 Joint Conference of Hokuriku Chapters of Electrical Societies H11

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary

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Published: 2004-04-01   Modified: 2016-04-21  

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