HIRAKAWA Yoshiaki

Affiliation

Faculty of Engineering, Division of Systems Research

Job Title

Associate Professor

Research Fields, Keywords

Submergible Ship, Ship, Wave-Buoy, Flying Boat

Mail Address

E-mail address



Education 【 display / non-display

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    2002

    Yokohama National University   Doctor Course   Unfinished Course

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    2001

    Yokohama National University   Master Course   Completed

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    1999

    Yokohama National University   Graduated

Degree 【 display / non-display

  • Doctor of Engineering - Yokohama National University

  • Master of Engineering - Yokohama National University

Campus Career 【 display / non-display

  • 2013.4
     
     

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Associate Professor  

  • 2011.7
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    2013.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Assistant Professor  

  • 2007.4
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    2011.6

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Research Fellow  

  • 2002.4
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    2007.3

    Duty   Yokohama National UniversityFaculty of Engineering   Division of Systems Research   Research Assistant  

  • 2021.4
     
     

    Concurrently   Yokohama National UniversityInterfaculty Graduate School of Innovative and Practical Studies   Associate Professor  

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Academic Society Affiliations 【 display / non-display

  • 2015
     
     
     

    日本航海学会

  • 2013
     
     
     

    日本航空宇宙学会

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    日本船舶海洋工学会

Research Areas 【 display / non-display

  • Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine engineering

 

Thesis for a degree 【 display / non-display

  • 高速航行中母船船尾からの搭載艇降下揚収新システムの開発研究

    平川 嘉昭

    2010.12

    Doctoral Thesis   Single Work  

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    横浜国立大学大学院工学府
    船尾から搭載艇を降下・揚収を実施できる船舶の船尾降下揚収システムについて、高速航行中や波浪中でも降下・揚収を可能とするための新システムの開発を行い、実験水槽において実証実験を実施し、理論計算、数値流体力学の手法を利用して実験結果を説明できる推定法を検討した。

  • 超幅広肥大船の波浪中抵抗増加特性及び抵抗増加抑制法について

    平川 嘉昭

    2001.3

    Master Thesis   Single Work  

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    横浜国立大学 工学研究科
    比較的水深が浅い港にも入港できるような超幅広浅吃水肥大船の波浪中での抵抗増加について、水槽実験により特性を把握し、実験結果を説明できるような理論計算についても検討した。また波浪中抵抗増加を抑制するための装置を付加した模型実験を実施した。

Papers 【 display / non-display

  • Statistical analysis of parametric roll in irregular seas on clusters with large roll amplitudes

    Yu Liwei, Ma Ning, Hirakawa Yoshiaki, Wang Shuqing

    JOURNAL OF MARINE SCIENCE AND TECHNOLOGY   24 ( 4 )   1153 - 1171   2019.12  [Reviewed]

    DOI Web of Science

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Joint Work  

  • Relative Motions of FLNG and LNG Carriers Arranged Side by Side and an Assessment of Their Operation

    Ryohei Yoshioka, Makoto Arai, Yoshiaki Hirakawa, Ning Ma, Kazuo Nishimoto

    One Petro   Vol.29 ( 2 )   2019.6

    DOI

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPE All rights reserved   Joint Work  

  • Model experiments on the early detection and rudder stabilization of KCS parametric roll in head waves

    Liwei YuKo TaguchiAkagi KentaNing Ma,Yoshiaki Hirakawa

    Download PDF Journal of Marine Science and Technology   23 ( 1 )   141 - 163   2018.3  [Reviewed]

    DOI

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    Language:English   Publishing type:Research paper (scientific journal)   Joint Work  

  • Offloading Operability Assessment for FLNG and LNG Carrier Arranged Side-by-side

    Yoshioka Ryohei, Arai Makoto, Hirakawa Yoshiaki, Ma Ning, Nishimoto Kazuo, Nakashima Akira

    Journal of the Japan Society of Naval Architects and Ocean Engineers   27 ( 0 )   41 - 48   2018

    DOI CiNii

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japan Society of Naval Architects and Ocean Engineers   Joint Work  

    <p>Floating LNG (FLNG) is a new type of offshore platform for production, liquefaction, storage and offloading of natural gas. The offloading process of liquefied natural gas (LNG) will use cryogenic loading arms between FLNG and LNG carrier in side-by-side arrangement. The loading arm has many track records in LNG terminals. However, environmental condition of offshore gas field is severer than those of ports. Unexpected large ship motions may occur and affect the offloading operability.</p><p>In this paper, the results of the operability assessment for the side-by-side offloading are presented. First, ship motions with liquid cargo in tanks and the free water surface motion in the narrow gap between two vessels are studied by numerical calculation in frequency domain and verified by model test. Then, the limits of environmental conditions for offloading operation are examined by the results of numerical calculation using the criteria for side-by-side offloading. Finally, offloading operability of FLNG and LNG carrier arranged side-by-side in Brazilian sea is evaluated.</p>

    Other Link: https://ci.nii.ac.jp/naid/130007439169

  • Development of Mini-Buoy for Short Term Measurement of Ocean Wave

    Y. Hirakawa, T. Takayama, T. Hirayama, H. Susaki,

    OCEANS 2016 MTS/IEEE   2016.9

    DOI

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE   Joint Work  

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Industrial Property Rights 【 display / non-display

  • 船舶搭載艇の降下揚収装置及び降下揚収方法

    Tsugukiyo Hirayama, Takehiko Takayama, Yoshiaki Hirakawa

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    Application no:PCT/JP2006/309771  Date applied:2006.5.10

    Announcement no:EP1886915A1, EP1886915A4, US7827925, US20090056611  Date announced:2006.11.16

    Country of applicant:Domestic  

    本発明は、船舶の高速航走時に搭載艇の降下揚収を行うことができるドック方式の降下揚収装置及び降下揚収方法を提供する。降下揚収装置は、搭載艇(10)を収容可能な船尾ドック(2)を有し、搭載艇をドックの船尾開口から船外に降下し、船外の搭載艇のドック内進入によって搭載艇を揚収する。降下揚収装置は、導水装置(11)を備え、船舶周囲の海水を取水口(12)から取込み、流出口(13)からドック内に流出する。後向水流がドック内に形成され、この水流は、ドックの船尾開口から船外に流出する。

  • 浮体構造物の動揺低減装置

    井上 憲一,永田 良典,清水 功一,平山 次清,高山 武彦,平川 嘉昭

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    Application no:特願2004-291091  Date applied:2004.10.4

    Announcement no:特開2006-103449  Date announced:2006.4.20

    Patent/Registration no:特許第4798573号  Date issued:2011.8.12

    Country of applicant:Domestic  

Awards 【 display / non-display

  • 日本船舶海洋工学会賞(発明考案等)

    2011.6    

  • 日本船舶海洋工学会東部支部、若手優秀講演者賞

    2008.1    

Grant-in-Aid for Scientific Research 【 display / non-display

  • 省エネルギー型アンチローリングシステムの開発

    2012.4 - 2015.3

    科学研究費補助金  Grant-in-Aid for Young Scientists(B)

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    Grant type:Competitive

Presentations 【 display / non-display

  • Ocean Wave Measurements Utilizing Ultra-Small-Buoy

    8th PUL Meeting (Port-city University League) 

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    Event date: 2014.10

    Language:English   Presentation type:Oral presentation (general)  

  • R&D on New Stern Boat Deployment and Recovery System from Running Ship

    5th PUL Meeting (Port-city University League) 

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    Event date: 2011.11

    Language:English   Presentation type:Oral presentation (general)  

 

Charge of on-campus class subject 【 display / non-display

  • 2021   波浪と船体運動Ⅱ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2021   波浪と船体運動Ⅰ

    Interfaculty Graduate School of Innovative and Practical Studies

  • 2021   海空耐航性能特論

    Graduate school of Engineering Science

  • 2021   海洋空間流体力学スタジオB

    Graduate school of Engineering Science

  • 2021   海洋空間流体力学スタジオA

    Graduate school of Engineering Science

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Social Contribution(Extension lecture) 【 display / non-display

  • 夏休み おもしろ船教室

    日本船舶海洋工学会  横浜市  2015.8

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    Type:Lecture

    小学生(高学年)・中学生を対象とし,実験等を交えながら,海や船についての講演を行う。

  • 夏休み おもしろ船教室

    日本船舶海洋工学会  横浜市  2014.8

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    Type:Lecture

    小学生(高学年)・中学生を対象とし,実験等を交えながら,海や船についての講演を行う。

  • テクノトランスファー in かわさき 2014

    川崎市  2014.5

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    Type:Exhibition

    テクノトランスファー in かわさき 2014において,「投げ込み式波浪計測ブイ」を出展

  • Sea Japan 2014

    東京  2014.4

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    Type:Exhibition

    国内最大の国際海事展Sea Japanにおいて,「船尾降下揚収システム・波浪レーダー・波浪ブイ」を出展

  • 夏休み おもしろ船教室

    日本船舶海洋工学会  横浜市  2013.8

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    Type:Lecture

    小学生(高学年)・中学生を対象とし,実験等を交えながら,海や船についての講演を行う。

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