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Studies on self-induced vibration of automatic pressure regulator and constant flow valve in the semi closed pipeline

Research Project

Project/Area Number 14560202
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionUniversity of Miyazaki

Principal Investigator

INAGAKI Hitone  University of Miyazaki, Faculty of Agriculture, Associate Professor (30325732)

Co-Investigator(Kenkyū-buntansha) TAKEFUMI Nakazono  宮崎大学, Faculty of Agriculture, Associate professor (80315358)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2002: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsAutomatic pressure regulator / Automatic constant flow valve / Semi-closed pipeline / Self-induced vibration / Direct-acting constant flow valve / Safety valve / 固定流量・直動式定流量弁 / 可変流量・ダイアフラム式定流量弁 / 現地・屋内水理実験 / パイプライン / 定量弁
Research Abstract

Semi-closed pipeline that combines an automatic pressure regulator with an automatic constant flow valve is introduced with the aim of achieving an optimum solution between the scale of the agricultural pipeline system and water control. This pipe line attempts to reduce excess pressure by the use of the automatic pressure regulator ; it also uses the chloroethene tube.
Further, the use of the automatic constant flow valve that is arranged in the downstream can exclude the effect of the extra watershed management located at the end. However, there exists a possibility that the system combining the automatic pressure regulator with the automatic constant flow valve can generate self-induced vibration.
When the demonstration was conducted at the site and the condition of self-induced vibration was verified, it was observed that a large self-induced vibration is not generated when the flow is smaller than the setting flow of the direct-acting constant flow valve. On the other hand, when the direct-acting constant flow valve is used near the setting flow, the working mechanism is used to activate the valve using the pipe pressure and the large self-induced vibration can be generated.
Further, with regard to the measures to control self-excited oscillation, it is known that self-excited oscillation is not completely restrained by merely blunting the response sensitivity of the automatic pressure regulator.
It is also known that when the safety valve installed in the upstream and downstream is of a small scale, the pressure vibration does not damp even if the safety valve is activated.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (6 results)

All 2004 2003 Other

All Journal Article (4 results) Publications (2 results)

  • [Journal Article] ポンプ急停止時における水柱分離およびスイング式逆止弁による水撃圧抑制の解析とその現地検証2004

    • Author(s)
      稲垣仁根・奈良大和・斎藤正樹・中園健文
    • Journal Title

      農業土木学会論文集 231号

      Pages: 83-96

    • NAID

      10013288466

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] Calculations and Field Measurement of Pressure Wave caused by Water Column Separation and Prevention of Water Hammer using Swing Check Valve after Pump Power Failure2004

    • Author(s)
      Hitone Inagaki, Yamato Nara, Masaki Saito, Takefumi Nakazono
    • Journal Title

      TRANSACTIONS of The Japanese Society of Irrigation, Drainage and Reclamation Engineering No.231

      Pages: 83-96

    • NAID

      10013288466

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] 水柱分離を考慮したポンプ送水系パイプラインの設計手法2003

    • Author(s)
      奈良大和・斎藤正樹・稲垣仁根・中園健文・秋吉康弘
    • Journal Title

      雨水資源化システム学会誌 VOL.9 NO.1

      Pages: 25-36

    • NAID

      110002667613

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Journal Article] A Method to Design Pumping Pipeline Considering Water Column Separation Phenomenon2003

    • Author(s)
      Yamato Nara, Masaki Saito, Hitone Inagaki, Takefumi Nakazono, Yasuhiro Akiyoshi
    • Journal Title

      Journal of Rainwater Catchment Systems Vol.9 No.1

      Pages: 25-36

    • NAID

      110002667613

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 奈良大和, 斎藤正樹, 稲垣仁根, 中園健文, 秋吉康弘: "水柱分離を考慮したポンプ送水系パイプラインの設計手法に関する研究"雨水資源化システム学会誌. VOL.9 NO.1. 25-36 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 稲垣仁根, 奈良大和, 斎藤正樹, 中園健文: "ポンプ急停止時における水柱分離およびスイング式逆止弁による水撃圧抑制の解析とその現地検証"農業土木学会論文集. 230号(印刷中). (2004)

    • Related Report
      2003 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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