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Affiliation |
Faculty of Engineering, Division of Systems Research |
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Job Title |
Associate Professor |
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Research Fields, Keywords |
Submergible Ship, Ship, Wave-Buoy, Flying Boat |
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Mail Address |
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HIRAKAWA Yoshiaki
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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 】
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Doctor of Engineering - Yokohama National University
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Master of Engineering - Yokohama National University
Campus Career 【 display / non-display 】
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2013.4
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Associate Professor
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2011.7-2013.3
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Assistant Professor
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2007.4-2011.6
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Research Fellow
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2002.4-2007.3
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Research Assistant
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2023.4
Concurrently Yokohama National UniversityInstitute for Multidisciplinary Sciences Associate Professor
Academic Society Affiliations 【 display / non-display 】
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2015
日本航海学会
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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 】
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Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine engineering
Thesis for a degree 【 display / non-display 】
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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
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
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 】
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An experimental study on comparison the safety of Japanese and Vietnamese purse seiners during operation
Trang NGUYEN T.H., HIRAKAWA Yoshiaki
Transactions of Navigation 8 ( 2 ) 21 - 32 2023.9 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本航海学会 Joint Work
<p>Fishing vessel accidents pose a challenge for both Japan and Vietnam. However, the differences in fishing vessel regulations between these two countries and the International Maritime Organization can be a barrier to improving their safety requirements. This study focuses on comparing the safety of Japanese and Vietnamese purse seiners in operation. A general comparison of principal parameters of Japanese and Vietnamese purse seiners is provided, followed by a comparison of the stability regulations for fishing vessels in Vietnam and Japan to determine any differences in safety requirements. Experimental investigations were then conducted to evaluate the seakeeping performance of Japanese purse seiners 199GT, 135GT, and Vietnamese MC11, including an analysis of their intact stability under the influence of fishing gear load and back rowing force.</p><p>The results show that the 135GT has less stability compared to the 199GT and the Vietnamese MC11, while the MC11 does not meet operability criteria even in average weather conditions. Additionally, differences in fishing methods between Japanese and Vietnamese purse seiners impact the vessel's heel angle and roll amplitude.</p>
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Experimental verification of seafloor crustal deformation observations by UAV-based GNSS-A
Yokota Yusuke, Kaneda Masata, Hashimoto Takenori, Yamaura Shusaku, Kouno Kenji, Hirakawa Yoshiaki
SCIENTIFIC REPORTS 13 ( 1 ) 2023.3
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Nguyen T.H. Trang, Hirakawa Yoshiaki
日本船舶海洋工学会論文集 38 ( 0 ) 17 - 27 2023
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本船舶海洋工学会 Joint Work
<p> In this study, the stability and operability of Japanese and Vietnamese purse seiners are analyzed. Three purse seiners (135GT, 199GT, and VNM) were tested through a series of experiments involving transient waves to determine their transfer functions and capsize experiments in irregular waves with fishing gear load.</p><p> A stability limiting boundary was developed to assess the risk of capsizing based on operability calculations and determine the maximum significant wave height at which the vessel can safely operate. The stability limiting boundary take into account the effect of fishing gear load and back rowing forces, as well as the direction of the wave. This stability limiting boundary can be used by fishermen to predict the wave conditions under which their vessels can operate safely. The relationship between the operability limiting boundary and the stability limiting boundary is presented. The study also compares the risk of capsizing in traditional and Japanese-style fishing methods.</p><p> Results show that 135GT is less stable compared to the other two ships, while the Vietnamese purse seiner VNM has good stability but poor operability, even in average weather conditions.</p>
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2022A-GS6-1 Prediction of a Spike-Like Acceleration Acting on a Small High-Speed Craft in Stochastic Waves
Terada Daisuke, Kinugasa Mizuki, Katayama Toru, Hirakawa Yoshiaki
Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 35 ( 0 ) 403 - 404 2022.11
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
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不規則波中で小型高速船に生じるスパイク状加速度の予測
寺田大介，絹笠瑞基，片山徹，平川嘉昭
日本船舶海洋工学会講演会論文集 ( 35 ) 403 - 404 2022.11
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
Review Papers 【 display / non-display 】
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平川嘉昭
日本マリンエンジニアリング学会誌 56 ( 6 ) 7 - 10 2021.11
Authorship：Lead author Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Single Work
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平川嘉昭
日本船舶海洋工学会誌 KANRIN（咸臨） ( 98 ) 2021.9
Authorship：Lead author Language：English Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Single Work
Industrial Property Rights 【 display / non-display 】
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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
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。
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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
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 】
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日本船舶海洋工学会賞（発明考案等）
2011.6
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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 】
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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)
Grant type：Competitive
Presentations 【 display / non-display 】
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Ocean Wave Measurements Utilizing Ultra-Small-Buoy
8th PUL Meeting (Port-city University League)
Event date： 2014.10
Language：English Presentation type：Oral presentation (general)
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R&D on New Stern Boat Deployment and Recovery System from Running Ship
5th PUL Meeting (Port-city University League)
Event date： 2011.11
Language：English Presentation type：Oral presentation (general)
Charge of on-campus class subject 【 display / non-display 】
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2024 BJ Collaborative Special Lecture on Naval Architecture and Offshore Engineering C
Interfaculty Graduate School of Innovative and Practical Studies
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2024 BJ Collaborative Special lecture on Naval Architecture and Offshore Engineering A
Interfaculty Graduate School of Innovative and Practical Studies
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2024 Ship Motions in Waves Ⅱ
Interfaculty Graduate School of Innovative and Practical Studies
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2024 Ship Motions in Waves Ⅰ
Interfaculty Graduate School of Innovative and Practical Studies
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2024 International Internship in Ocean and Space System Engineering
Graduate school of Engineering Science
Social Contribution(Extension lecture) 【 display / non-display 】
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夏休み おもしろ船教室
日本船舶海洋工学会 横浜市 2015.8
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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夏休み おもしろ船教室
日本船舶海洋工学会 横浜市 2014.8
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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テクノトランスファー in かわさき 2014
川崎市 2014.5
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
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Sea Japan 2014
東京 2014.4
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
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夏休み おもしろ船教室
日本船舶海洋工学会 横浜市 2013.8
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。
Media Coverage 【 display / non-display 】
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東大など、飛行艇型ドローンで深海測距 水深1300ｍの基準局と音響通信
日刊工業新聞 2022.11
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強力扇風機を乗せた帆船は強力扇風機の風で進むことはできるのか？
日本テレビ サンバリュ「できる？できない？」 2022.7