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Affiliation |
Faculty of Engineering, Division of Systems Research |
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Job Title |
Professor |
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Research Fields, Keywords |
Structural Analysis, Structural Design, Hull Structural Dynamics |
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Mail Address |
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Related SDGs |
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OKADA Tetsuo
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The Best Research Achievement in Research Career 【 display / non-display 】
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【Book】 Design of Ship Hull Structures - A Practical Guide for Engineers, Second Edition 2026.02
【Published Thesis】 On Board Measurement of Stresses and Deflections of a Post-Panamax Containership and its Feedback to Rational Design 2006.12
【Published Thesis】 Optimization of ship structural design by genetic algorithm 1992.05
The Best Research Achievement in the last 5 years 【 display / non-display 】
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【Book】 Design of Ship Hull Structures - A Practical Guide for Engineers, Second Edition 2026.02
【Published Thesis】 Bayesian updating of estimated parameters representing multi-modal directional wave spectrum using measured hull stress(Proceedings of the ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023)) 2023.06
【Published Thesis】 A study on scantling formulae of plate members due to lateral pressure under the effect of axial loads(MARINE STRUCTURES) 2021.11
【Published Thesis】 A study on whipping related double bottom response as well as its statistical characteristics based on full-scale measurements 2021.09
【Book】 Strength of Materials - Fundamentals for structural strength design 2021.04
Education 【 display / non-display 】
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1980.4-1986.3
The University of Tokyo Naval Architecture Graduated
Campus Career 【 display / non-display 】
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2015.1
Duty Yokohama National UniversityFaculty of Engineering Division of Systems Research Professor
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2021.4
Concurrently Yokohama National UniversityInterfaculty Graduate School of Innovative and Practical Studies Professor
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2018.4
Concurrently Yokohama National UniversityGraduate school of Engineering Science Department of Mechanical Engineering, Materials Science and Ocean Engineering Professor
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2017.4
Concurrently Yokohama National UniversityCollege of Engineering Science Department of Mechanical Engineering, Materials Science and Ocean Engineering Professor
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2016.1-2018.3
Concurrently Yokohama National UniversityCenter for Oceanic Studies and Integrated Education Professor
External Career 【 display / non-display 】
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2013.1-2014.12
Japan Marine United Corporation
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2010.4-2017.9
Kyushu Institute of Technology Graduate School of Engineering (Spring term each year) Adjunct lecturer
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2002.10-2012.12
IHI Marine United Inc.
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1986.4-2002.9
Ishikawajima-Harima Heavy Industries, Co., Ltd.
Academic Society Affiliations 【 display / non-display 】
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1986.4
The Japan Society of Naval Architects and Ocean Engneers
Research Areas 【 display / non-display 】
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Frontier Technology (Aerospace Engineering, Marine and Maritime Engineering) / Marine and maritime engineering
Research Career 【 display / non-display 】
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Rational Structural Design Method for Ships and Offshore Structures
Project Year：
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Study on Structure of LNG Tanks
Project Year：
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Strength against Whipping Response of Large Container Ships
Project Year：
Books 【 display / non-display 】
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Design of Ship Hull Structures - A Practical Guide for Engineers, Second Edition
Yasuhisa Okumoto, Tetsuo Okada, Yu Takeda, Masaki Mano, Masanobu Toyoda（ Role： Joint author）
（ ISBN:9783032117892 ）
Total pages：710 Language：English Book type：Scholarly book
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Strength of Materials - Fundamentals for structural strength design
Tetsuo Okada, Keisuke Watanabe, Yasumi Kawamura, Yoshikazu Tanaka, Naoki Osawa, Hideaki Murayama（ Role： Joint author , Ch.1~3, Sec.5.1~5.3, Sec.6.1~6.3, Ch.9, Appendix）
Asakura Publishing Co., Ltd. （ ISBN:978-4-254-23150-2 ）
Total pages：288 Responsible for pages：1-74, 89-125, 133-175, 183-193, 219-222, 269-271 Language：Japanese Book type：Textbook, survey, introduction
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Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume I
Sing-Kwan Lee, et al.（ Role： Joint editor）
Springer （ ISBN:978-9811546235 ）
Total pages：1074 Language：English Book type：Scholarly book
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Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume II
Tetsuji Miyashita, et al.（ Role： Joint editor）
Springer （ ISBN:978-9811546716 ）
Total pages：858 Language：English Book type：Scholarly book
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Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume III
James A. Coller, et al.（ Role： Joint editor）
Springer （ ISBN: 978-9811546792 ）
Total pages：772 Language：English Book type：Scholarly book
Thesis for a degree 【 display / non-display 】
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Application of Optimization Techniques to Hull Structural Design and Lofting
Tetsuo Okada
2006.6
Doctoral Thesis Single Work
Design of ship hull structure can be divided into 3 categories, i.e. basic design to determine general arrangement and midship section, detailed design to determine detailed structural shape and scantlings, and production design / lofting to develop production and piece drawings for actual construction. Through all these stages, rational design can be accomplished by the application of optimization techniques.
In this paper, the author touches upon:
1.Optimizaion of hull structural analysis and mesh division for finite element analysis
2.Optimization of midship initial design and detailed structural shape and scantlings utilizing genetic algorithm
3.Optimization of nesting utilizing new algorithm
and shows practical applicability of optimization techniques in these fields.
Papers 【 display / non-display 】
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Sato Ryoya, Kawamura Yasumi, Okada Tetsuo, Hayakawa Ginga
Journal of the Japan Society of Naval Architects and Ocean Engineers 42 ( 0 ) 55 - 72 2025.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
<p> In recent years, the increasing size of container ships has led to more frequent occurrences of elastic vibrations such as whipping and springing, which superimpose on wave responses and reduce fatigue life. Therefore, the importance of fatigue assessment considering elastic vibration is increasing. In this study, fatigue assessment using several spectral methods was conducted on stress measurement data from two large container ships, and the effectiveness of each method was examined. The spectral methods employed included the narrow-band method, the Jiao method for bimodal processes, and the DK method for wide-band processes. Their results were compared with those from the rainflow counting method. The results showed that the narrow-band method and the Jiao method tended to evaluate fatigue damage on the conservative side, while the DK method tended to yield less conservative (riskier) evaluations. The narrow-band method did not accurately reflect actual phenomena, as it deviates from actual rainflow counting. On the other hand, the DK method was found to be a good model that captures the real physical behavior.</p><p> Therefore, a correction factor was introduced to the probability density function of the DK method to extend the distribution toward the higher stress range. By using the ratio of zeroth moment of the wave component and zeroth moment of the elastic vibration component, conditions likely to cause significant whipping were identified, and a formula for determining the correction factor based on this value was proposed. This approach enabled more accurate estimation of fatigue damage.</p>
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On a Simple Formulation of the Effect of Web Shear Stress on the Bending Strength of Stiffeners
Xu Zihan, Okada Tetsuo, Kawamura Yasumi, Hayakawa Ginga
Journal of the Japan Society of Naval Architects and Ocean Engineers 42 ( 0 ) 39 - 54 2025.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work
<p> Stiffeners are essential members of ship hull structures composed of stiffened panels, and their scantling formulae against lateral pressure are important for designing safe and rational hull structures. In typical scantling formulae of classification societies, the reduction in the fully plastic moment due to the shear stress is not directly considered in the current design.</p><p> In this study, we first derived a simple formulation of the shear stress effect with the simultaneous action of an axial stress under a given stiffener configuration and showed that the reduction of the fully plastic moment can be calculated using three non-dimensional parameters. Based on the formulation, we discussed how each parameter contributes to the fully plastic moment as well as the condition under which the shear stress can be effectively neglected. Subsequently, we used finite element analysis (FEA) based on the residual deflection criterion, thereby verifying the validity of the theoretical proposals. Finally, we proposed a scantling formula, rationally taking account of the shear stress effect.</p>
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Chen, X; Okada, T; Kawamura, Y; Takami, T; Oka, M
OCEAN ENGINEERING 340 2025.11
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Ma, HY; Zhang, LG; Okada, T; Kawamura, Y; Ren, HL; Sun, SL; Liu, N; Li, CF
OCEAN ENGINEERING 339 2025.11
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Ma, HY; Zhang, LG; Okada, T; Kawamura, Y; Wang, DY; Sun, SL; Liu, N; Li, CF
OCEAN ENGINEERING 338 2025.11
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
Review Papers 【 display / non-display 】
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Development of Local Scantling Formulae for Plate Members
Tetsuo Okada
ClassNK Technical Journal 6 ( 2 ) 33 - 55 2022.12
Authorship：Lead author Language：English Publishing type：Internal/External technical report, pre-print, etc. Single Work
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Development of Local Scantling Formulae for Plate Members
Tetsuo Okada
ClassNK Technical Journal 6 ( 2 ) 27 - 40 2022.12
Authorship：Lead author Language：Japanese Publishing type：Internal/External technical report, pre-print, etc. Single Work
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Study on thickness effect to fatigue strength and its feedback to the rules
Tetsuo Okada, Norio Yamamoto, Masashi Mouri
KANRIN ( 60 ) 27 - 37 2015.5
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：THe Japan Society of Naval Architects and Ocean Engineers Joint Work
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Strategy of the Industry and a Role of Welding to Build a Neo-Nippon - Ships (The Shipbuilders' Association of Japan)
Yoshiyuki Nakajima, Tetsuo Okada
Journal of the Japan Welding Society 82 ( 1 ) 24 - 28 2013.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：The Japan Welding Society Joint Work
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F.P.TANK内外板ロンジのスロット損傷について
岡田哲男
TechnoMarine ( 882 ) 14 - 16 2004.11
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (other) Publisher：日本造船学会 Single Work
Awards 【 display / non-display 】
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OMAE 2023 CONFERENCE BEST PAPER AWARD, Structures, Safety and Reliability Symposium
2024.6 ASME Bayesian Updating of Estimated Parameters RepresentingMulti-Modal Directional Wave Spectrum Using MeasuredShip Hull Stresses
Individual or group name of awards：Hiromi Kubo, Tetsuo Okada, Xi Chen, Yasumi Kawamura, Taiga Mitsuyuki, Ginga Hayakawa
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日本船舶海洋工学会論文賞、日本海事協会賞
2021.5 日本船舶海洋工学会、日本海事協会 大型コンテナ船に生じる弾性振動応答を考慮した疲労強度の簡易推定手法
Individual or group name of awards：宮下哲治, 岡田哲男, 川村恭己, 関紀明, 花田崚
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横浜国立大学平成29年度ベストティーチャー賞
2018.7 横浜国立大学
Individual or group name of awards：岡田哲男
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Inui Award, The Society of Naval Architects of Japan
1993.5 The Society of Naval Architects of Japan Optimization of Ship Structural Design by Genetic Algorithm
Individual or group name of awards：Tetsuo Okada
Presentations 【 display / non-display 】
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Sea state estimation using measured ship responses as a key technology of digital twin for ship structures
Tetsuo Okada
4th International Conference on Smart & Green Technology for Shipping including Offshore Decommissioning (SMATEC 2023) 2023.4 ASRANet
Event date： 2023.4
Language：English Presentation type：Oral presentation (general)
Venue：Online (London)
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Focal points on strength learned from recent casualties and research activities
岡田哲男 [Invited]
Ultra large container ships
Event date： 2018.11
Language：English Presentation type：Oral presentation (general)
Venue：大連理工大学
招待講演”Ultra large container ships – Focal points on strength learned from recent casualties and research activities”, 大連理工大学、2018年11月23日
Preferred joint research theme 【 display / non-display 】
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Structural Strength, Analysis, Design of Ships and Offshore Structures
Charge of on-campus class subject 【 display / non-display 】
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2026 Welding Engineering
College of Engineering Science
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2026 Welding Engineering
College of Engineering Science
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2026 Seminar on Structural Mechanics
College of Engineering Science
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2026 Structural Mechanics of Ships
College of Engineering Science
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2026 Construction of Steel Structure
College of Engineering Science
Charge of off-campus class subject 【 display / non-display 】
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先端産業システム特論ー船舶構造設計論
Institution：九州工業大学
Committee Memberships 【 display / non-display 】
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日本船舶海洋工学会
2025.5 副会長・理事・東部支部長
Committee type：Academic society
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日本海事協会技術委員会船体専門委員会
2022.11 委員長
Committee type：Academic society
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日本海事協会技術委員会船体専門委員会
2022.8 - 2022.11 委員
Committee type：Academic society
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日本海事協会技術委員会
2022.6 技術委員
Committee type：Academic society
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Lloyd's Register Japan National Committee
2022.5 - 2024.5
Committee type：Academic society
Social Contribution(Extension lecture) 【 display / non-display 】
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2018 Short Stay Program at Yokohama National University for participants from Shanghai Jiao Tong University, Dalian University of Technology and Danang University of Science and Technology
工学府海洋宇宙システム工学コース 横浜国立大学 2018.2
Type：Lecture
講義"Ultra large container ships - Focal points on strength issues learned from recent casualties and research activities"
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2016 International Summer School on Naval Architecture, Ocean Engineering and Mechanics
Shanghai Jiao Tong University Shanghai Jiao Tong University 2016.7
Type：Lecture
講義"To Understand Practical Design of Ship Hull Structures through application of beam theory"
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2016 Short Stay Program at Yokohama National University for delegates of Shanghai Jiao Tong University, Federal University of Pernambuco and Dalian University of Technology
工学府海洋宇宙システム工学コース 横浜国立大学 2016.2
Type：Lecture
講義"Arch effect in the design of ship hull structures"
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日本船舶海洋工学会構造強度・材料溶接分野「夏の学校」2015講師
日本船舶海洋工学会 九州大学、福岡県 2015.8
Type：Lecture
「材料力学で理解する船体構造力学」講義
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2015 International Summer School on Naval Architecture, Ocean Engineering and Mechanics
Shanghai Jiao Tong University Shanghai Jiao Tong University 2015.7
Type：Lecture
講義"To Understand Practical Design of Ship Hull Structures through application of beam theory"