Details of a Researcher

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

Zhou, HY; Okada, T; Kawamura, Y; Wang, DY; Hayakawa, G

APPLIED SCIENCES-BASEL 14 ( 14 ) 2024.7 [Reviewed]

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：MDPI Joint Work

2024S-GS11-3 Estimation of Encounter Directional Wave Spectra of Arbitrary Shapes Based on Measured Ship Stress Using Dimensionality Reduction with Autoencoder

Tai Ryota, Betchaku Shigetatsu, Okada Tetsuo, Hayakawa Ginga, Kawamura Yasumi

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 475 - 482 2024.5

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

2024S-GS22-4 A Study of Identification Method of Re-tensile Plastic zone's Generated Load Based on Strain Measurement in Fatigue Tests

Hirata Naoya, Hayakawa Ginga, Kawamura Yasumi, Okada Tetsuo

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 693 - 701 2024.5

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

2024S-GS22-2 A Study on the Effectiveness of Fatigue Assessment Using Spectral Method Considering Elastic Vibration Response on a Large Container Ship

Sato Ryoya, Kawamura Yasumi, Okada Tetsuo, Hayakawa Ginga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 679 - 686 2024.5

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

2024S-GS20-2 Simple Formulation of Biaxial Stress Effects on the Plate Strength under Lateral Pressure

Yamada Masashi, Okada Tetsuo, Kawamura Yasumi, Hayakawa Ginga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 625 - 632 2024.5

A study on the scantling formulae of a stiffener against lateral pressure under the simultaneous action of axial load

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

Daoyang Zhang, Zihan Xu, Tetsuo Okada, Yasumi Kawamura, Ginga Hayakawa, Kinya Ishibashi, Hiroyuki K … Show more authors

95 2024.3 [Reviewed]

A digital twin for ship structures - R&D project in Japan

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

Masahiko Fujikubo, Tetsuo Okada, Hideaki Murayama, Hidetaka Houtani, Naoki Osawa, Kazuhiro Iijima, … Show more authors

Data-Centric Engineering 5 e7 2024.3 [Reviewed]

Uncertainty Analysis Method for Estimating Wave Parameters Based on Ship Responses (1st Report-Influence of the Ship Speed and Uncertainty in the measurement data)

Language：English Publishing type：Research paper (scientific journal) Publisher：Cambridge University Press Joint Work

Chen Xi, Takami Tomoki, Oka Masayosi, Kawamura Yasumi, Okada Tetsuo

Journal of the Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 65 - 74 2023.12 [Reviewed]

Development of a floating-type ocean current turbine system and stress measurement of the floater in actual sea area demonstration test

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

The main purpose of this paper is to develop a new intrusive method to replace the traditional non-intrusive methods, such as Monte Carlo Simulation (MCS). By using the proposed method, the estimation of the stochastic response surface does not require time consuming multiple simulations, but the uncertainties in wave parameter can be estimated by optimizing the stochastic objective function only once. This study discusses the uncertainty in wave parameters estimated by using the present method when both the transfer function and the measurement data contain uncertainties. The validity of the present method is discussed by comparing its results to the results of uncertainty analyses through the MCS in which solutions of the deterministic problems are collected.

Dodo Yasushi, Okada Tetsuo

Journal of the Japan Society of Naval Architects and Ocean Engineers 38 ( 0 ) 141 - 154 2023.12 [Reviewed]

Bisection Constraint Method for Multiple-Loading Conditions in Structural Topology Optimization

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

The Kuroshio current flowing near the coastal areas of Japan is one of the strongest ocean currents in the world. In addition, it is expected to be a stable power source of renewable energy from the ocean. Recently various ideas are studied to utilize the Kuroshio current for power generation by researchers worldwide. But there has hardly ever been report on demonstration tests in actual sea areas and stress measurement of the demonstration machine.　We are developing a floating-type ocean current turbine system to utilize the Kuroshio current for power generation supported by NEDO. In this paper, we report the result of demonstration tests in the actual sea area. Especially the power curve was obtained from the measurement in the demonstration test and we confirmed that the estimated capacity factor using the power curve fulfills our initial expectation.　As a result of the stress measurement, good agreement was observed in general between the measured stresses and the FEM results. However, it was confirmed that with the turbine rotating, the hull may vibrate significantly with the frequencies corresponding to the multiples of the turbine rotation. This is considered to be a resonance of the hull at those frequencies, and although the absolute amplitude of the vibration is small and does not pose a problem for this demonstration test machine, it may become a design issue for future large-scale commercial machines.

Thi, PT; Kawamura, Y; Okada, T

APPLIED SCIENCES-BASEL 13 ( 24 ) 2023.12 [Reviewed]

A general scaled model design method of stiffened plate subjected to combined longitudinal compression and lateral pressure considering the ultimate strength and collapse modes

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

Simple formulation of the combined axial stress-aspect ratio effect on the plate collapse strength under lateral pressure

Masashi Yamada, Tetsuo Okada, Yasumi Kawamura, Ginga Hayakawa, Kinya Ishibashi, Hiroyuki Koyama

36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2023), Busan, Korea 157 - 165 2023.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2023 Joint Work

Estimation of directional wave spectra of arbitrary shape based on measured ship stress - dimensional reduction by principal component analysis

Akira Imai, Tetsuo Okada, Xi Chen, Yasumi Kawamura, Ginga Hayakawa, Taiga Mitsuyuki

36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2023), Busan, Korea 114 - 121 2023.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2023 Joint Work

Dimensionality reduction of 2D directional wave spectrum using autoencoder

Shigetatsu Betchaku, Yasumi Kawamura, Tetsuo Okada, Ginga Hayakawa, Taiga Mitsuyuki

36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2023), Busan, Korea 106 - 113 2023.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2023 Joint Work

Estimation of the stress concentration factor and stress gradient around weld beads using machine learning

Mao Yokoyama, Fei Wang, Tetsuo Okada, Yasumi Kawamura, Ginga Hayakawa

36th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2023), Busan, Korea 43 - 50 2023.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2023 Joint Work

Ma Hongyang, Kawamura Yasumi, Okada Tetsuo, Wang Deyu, Hayakawa Ginga

MARINE STRUCTURES 90 2023.7 [Reviewed]

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

2023S-GS12-2 Analysis of Plastic Behavior of Crack Tip during Fatigue Crack Growth with Elasto-Plastic FEM

Hayakawa Ginga, Kawamura Yasumi, Okada Tetsuo, Kiyosawa Tomohide

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 36 ( 0 ) 539 - 546 2023.6

Stochastic wave spectra estimation (SWSE) based on response surface methodology considering uncertainty in transfer functions of a ship

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Bayesian updating of estimated parameters representing multi-modal directional wave spectrum using measured hull stress

Hiromi Kubo, Tetsuo Okada, Xi Chen, Yasumi Kawamura, Taiga Mitsuyuki, Ginga Hayakawa

Proceedings of the ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023) OMAE2023- - 104224 2023.6 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The American Society of Mechanical Engineers Joint Work

Xi Chen, Tomoki Takami, Masayoshi Oka, Yasumi Kawamura, Tetsuo Okada

MARINE STRUCTURES 90 103423 2023.3 [Reviewed]

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

2022A-GS15-1 Dimensional Reduction of Directional Wave Spectrum Using Autoencoder

Kawamura Yasumi, Katao Hiroki, Okada Tetsuo, Hayakawa Ginga, Mitsuyuki Taiga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 35 ( 0 ) 565 - 572 2022.11

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022A-GS15-3 Development of CNN-Based Sea State Estimation for Tank Test Data Considering the Uncertainty of Measurement Data

Shoeba Islam, Kawamura Yasumi, Okada Tetsuo, Mitsuyuki Taiga, Chen Xi, Hayakawa Ginga

日本船舶海洋工学会講演会論文集 35 ( 0 ) 585 - 592 2022.11

Language：English Publishing type：Research paper (other science council materials etc.) Publisher：公益社団法人日本船舶海洋工学会 Joint Work

2022A-GS15-2 Estimation of Directional Wave Spectra Using a Wave Height Sensor and Stress Sensors on Board a Large Container Ship

Liu Xue, Okada Tetsuo, Chen Xi, Kawamura Yasumi, Mitsuyuki Taiga

日本船舶海洋工学会講演会論文集 35 ( 0 ) 573 - 583 2022.11

Language：English Publishing type：Research paper (other science council materials etc.) Publisher：公益社団法人日本船舶海洋工学会 Joint Work

Influence of plate aspect ratio on the axial load effect on the plate strength against lateral pressure

Masashi Yamada, Tetsuo Okada, Yoshiaki Naruse, Yasumi Kawamura, Ginga Hayakawa, Kinya Ishibashi, Hi … Show more authors

Practical Design of Ships and Other Floating Structures: Proceedings of the 15th International Symposium, PRADS 2022, October 9-13, 2022, Dubrovnik, Croatia 145 - 158 2022.10 [Reviewed]

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

Committee IV.1 Design Principles and Criteria

Collette, M., Caridis, P., Georgiev, P., Horte, T., Jeong, H. K., Kurt, R., Ilnytskiy, I., Okada, T … Show more authors

Proceedings of the 21st International Ship and Offshore Structures Congress VOLUME 1 Technical Committee Reports 1 643 - 743 2022.9 [Reviewed]

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

2022S-GS1-3 Estimationof Crack Tip Plastic Region Formation Behavior Based on Strain Measurement near the Crack Tipunder Variable Cyclic Loading

Hayakawa Ginga, Kawamura Yasumi, Okada Tetsuo, Nandasiri Dumbarangage Eashan Gayantha

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 241 - 250 2022.5

Authorship：Last author Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022S-GS11-4 A Study on the Estimation of Encountered Wave Spectrum Based on Measured Ship Stress of a Capesize Bulk Carrier

Uchida Hibiki, Chen Xi, Okada Tetsuo, Kawamura Yasumi, Mitsuyuki Taiga, Yoshida Tomomi

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 495 - 502 2022.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022S-GS14-4 The Stress Measurement and Evaluation of the Pod Structure of Ocean Current Turbine System in an Actual Sea Demonstration Test

Dodo Yasushi, Okada Tetsuo, Nagaya Shigeki, Ishikuro Yasuhiro

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 563 - 565 2022.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022S-OS5-6 Evaluation of Response in Still Water and Waves for Capesize Bulk Carriers

Hirakawa Shinichi, Yoshida Tomomi, Okada Tetsuo, Tatsumi Akira, Uchida Hibiki, Chen Xi, Seki Noriak … Show more authors

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 155 - 161 2022.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022S-OS5-3 Validation of the Data Assimilation Methods of the Digital-Twin System for Ship Structure via a Tank Test Using a Hydro-Structural Bulk-Carrier Model

Houtani Hidetaka, Komoriyama Yusuke, Miyake Yuto, Kuroda Takako, Iijima Kazuhiro, Oka Masayoshi, Mi … Show more authors

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 137 - 143 2022.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2022S-GS8-1 A Proposal of a Method to Detect Whipping Based on Full Scale Measurements of a Large Container Ship

Furudate Keita, Okada Tetsuo, Kawamura Yasumi, Hayakawa Ginga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 399 - 406 2022.5

A Study on Bayesian Updating of Time History Sea State Estimation Based on Measured Hull Stresses

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Kubo Hiromi, Okada Tetsuo, Chen Xi, Kawamura Yasumi, Mitsuyuki Taiga

Journal of the Japan Society of Naval Architects and Ocean Engineers 34 ( 0 ) 73 - 85 2022.2 [Reviewed]

A study on scantling formulae of plate members due to lateral pressure under the effect of axial loads

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

To ensure structural safety of large container ships, advanced application of monitoring data is pursued in the structural health monitoring project. In this study, we estimated statistical sea state that the ship actually encountered using Bayesian updating of the sea state data estimated from the measured hull stresses. To achieve reliable real-time short-term statistical estimation of the sea state, we introduced forgetting rate to the past data in the Bayesian model. In addition, abrupt change of the sea state due to the ship operation was detected by Bayesian analysis of the data to obtain probable time history of the sea state by Bayesian update. As a result, good tracking performance of the real time sea state was demonstrated.

Bayesian updating of sea state parameters based on measured hull stresses given on-board at regular intervals

Hiromi Kubo, Tetsuo Okada, Xi Chen, Yasumi Kawamura, Taiga Mitsuyuki

34th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2020/21), Istanbul, Turkey 478 - 487 2021.12

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

A theoretical study on stiffener strength against lateral pressure under the effect of axial loads

Zihan Xu, Daoyang Zhang, Tetsuo Okada, Yasumi Kawamura, Ginga Hayakawa, Yoshiaki Naruse, Kinya Ishi … Show more authors

34th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2020/21), Istanbul, Turkey 396 - 406 2021.12

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

Dimensionality reduction of wave spectra by an autoencoder for development of a NN-based sea state estimation method

Hiroki Katao, Yasumi Kawamura, Tetsuo Okada, Taiga Mitsuyuki, Ginga Hayakawa

34th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2020/21), Istanbul, Turkey 90 - 99 2021.12

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

Umezawa Rikuto, Naruse Yoshiaki, Okada Tetsuo, Kawamura Yasumi, Ishibashi Kinya, Koyama Hiroyuki

MARINE STRUCTURES 80 103099 2021.11 [Reviewed]

Estimation of directional wave spectra and hull structural responses based on measured hull data on 14,000 TEU large container ships

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

Chen Xi, Okada Tetsuo, Kawamura Yasumi, Mitsuyuki Taiga

MARINE STRUCTURES 80 103087 2021.11 [Reviewed]

Sea state estimation using monitoring data by convolutional neural network (CNN)

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

Kawai Toshiki, Kawamura Yasumi, Okada Tetsuo, Mitsuyuki Taiga, Chen Xi

JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 26 ( 3 ) 947 - 962 2021.9 [Reviewed]

A study on whipping related double bottom response as well as its statistical characteristics based on full-scale measurements

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

Chen Jie, Okada Tetsuo, Kawamura Yasumi, Chen Xi, Mitsuyuki Taiga

JOURNAL OF MARINE SCIENCE AND TECHNOLOGY 26 ( 3 ) 846 - 860 2021.9 [Reviewed]

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

2021S-GS3-2 A Study on Bayesian Updating of Time History Sea State Estimation Based on Measured Hull Stresses

Kubo Hiromi, Okada Tetsuo, Chen Xi, Kawamura Yasumi, Mitsuyuki Taiga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 32 ( 0 ) 293 - 301 2021.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A Study on the Effects of Small Bottom Stiffeners on Sloshing Resonance

Liang-Yee Cheng, Hiroaki Kobayakawa, Tetsuo Okada, Cezar Augusto Bellezi, Fabio Kenji Motezuki, Luc … Show more authors

Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume I 1003 - 1024 2021 [Reviewed]

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

Development and Design of a Floating Type Ocean Current Turbine System

Yasushi Dodo, Shigeki Nagaya, Tetsuo Okada, Makoto Toyoda, Akio Ito

Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume III 732 - 755 2021 [Reviewed]

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

Statistical Characteristics of Whipping Response of a Large Container Ship under Various Sea States and Navigational Conditions Based on Full-Scale Measurements

Tetsuji Miyashita, Tetsuo Okada, Yasumi Kawamura, Noriaki Seki, Ryo Hanada

Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume II 3 - 24 2021 [Reviewed]

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

Scantling Evaluations of Plates and Stiffeners Based on Elasto-plastic Analysis under Axial Loads and Lateral Pressures

Yoshiaki Naruse, Masato Kim, Rikuto Umezawa, Kinya Ishibashi, Hiroyuki Koyama, Tetsuo Okada, Yasumi … Show more authors

Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume II 100 - 127 2021 [Reviewed]

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

Numerical Assessment of Sloshing Loads in Rectangular Tanks Equipped with Perforated Swash Bulkhead under Large Excitations

Cezar Augusto Bellezi, Liang-Yee Cheng, Tetsuo Okada, Makoto Arai

Practical Design of Ships and Other Floating Structures: Proceedings of the 14th International Symposium, PRADS 2019, September 22-26, 2019, Yokohama, Japan- Volume I 954 - 972 2021 [Reviewed]

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

2020A-GS6-3 Damping Ratio of Vertical Bending and Torsional Vibration Based on Full Scale Measurement of a Large Container Ship

Hanada Ryo, Okada Tetsuo, Kawamura Yasumi, Hayakawa Ginga, Miyashita Tetsuji

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 31 ( 0 ) 191 - 197 2020.11

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2020A-GS7-3 A Study on Design Formulae of the Effective Span of a Stiffener Fitted with a Web stiffener

Zhang Daoyang, Okada Tetsuo, Kawamura Yasumi

日本船舶海洋工学会講演会論文集 31 ( 0 ) 213 - 221 2020.11

Language：English Publishing type：Research paper (other science council materials etc.) Publisher：公益社団法人日本船舶海洋工学会 Joint Work

2020A-GS6-2 A Studyon the Modeling of Whipping Phenomena Basedon Actual Ship Measurements and Its Influence on Fatigue Crack Growth

Hayakawa Ginga, Kawamura Yasumi, Okada Tetsuo, Takahashi Ryo

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 31 ( 0 ) 185 - 190 2020.11

Strength evaluation of intersection between stiffeners and primary supporting members in double hull structure

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Liuting Gu, Tetsuo Okada, Lijuan Xia, Yasumi Kawamura

Marine structures 74 102789-1 - 102789-26 2020.11 [Reviewed]

Simple estimation method of fatigue strength due to wave induced hull girder bending including the effect of vibration response on a container ship

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

Miyashita Tetsuji, Okada Tetsuo, Kawamura Yasumi, Seki Noriaki, Hanada Ryo

Journal of the Japan Society of Naval Architects and Ocean Engineers 31 ( 0 ) 123 - 134 2020.9 [Reviewed]

Estimation of on-site directional wave spectra using measured hull stresses on 14,000 TEU large container ships

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

The recent increase in the size of container ships has resulted in lower natural frequency of the hull girder vertical bending and torsional vibrations; this has caused great concern regarding excessive whipping in these responses to incident waves. To accurately account for whipping in ship design, it is important to understand the relationship between the whipping response and sea states in which the ship operates. However, this specific topic has been reported little to date. In this study, we quantitatively analyze the influence of various sea states and navigational conditions on the whipping response in hull girder bending vibration and torsional vibration based on full-scale measurement. Moreover, a simple estimation method is proposed for fatigue damage using the relationship between whipping and sea states/navigational conditions. By providing quantitative analysis of the relationship between whipping and sea states/navigational conditions, our study will contribute to future ship design to ensure better operation safety and longer hull life.

Xi Chen, Tetsuo Okada, Yasumi Kawamura, Taiga Mitsuyuki

Journal of Marine Science and Technology 25 ( 3 ) 690 - 706 2020.9 [Reviewed]

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

2020S-GS9-4 Influences of Bow Flare Shape on Whipping Response of a Large Container Ship

Oto Ayano, Okada Tetsuo, Kawamura Yasumi, Miyashita Tetsuji, Nagashima Tomoki

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 30 ( 0 ) 445 - 451 2020.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2020S-OS8-3 A Study on the Estimation Method of Wave Spectrum Using Measured Hull Responses in Tank Test on Digital Twin of Ship Structure

Chen Xi, Okada Tetsuo, Kawamura Yasumi, Mitsuyuki Taiga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 30 ( 0 ) 213 - 219 2020.5

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

2020S-GS9-6 Uncertainty Analysis for Ultimate Strength of Stiffened Plate Using Finite Element Method

Takasaki Shun, Kawamura Yasumi, Wang Gaoyang, Okada Tetsuo, Hayakawa Ginga

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers 30 ( 0 ) 461 - 466 2020.5

Statistical Analysis of Vertical and Torsional Whipping Response Based on Full-Scale Measurement of a Large Container Ship

Language：Japanese Publishing type：Research paper (other science council materials etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Ryo Hanada, Tetsuo Okada, Yasumi Kawamura, Tetsuji Miyashita

Applied Sciences 10 ( 8 ) 2978 2020.4 [Reviewed]

A numerical study of the effects of bottom and sidewall stiffeners on sloshing behavior considering roll resonant motion

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

Marcio Michiharu Tsukamoto, Liang-Yee Cheng, Hiroaki Kobayakawa, Tetsuo Okada, Cezar Augusto Bellezi

Marine Structures 72 2020.3 [Reviewed]

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

A study on the hull girder under dynamic loading considering the effects of strain-rate dependency on material properties

Fumiko Tanaka, Sho Kotajima, Yasumi Kawamura, Tetsuo Okada

Chinese Journal of Ship Research 14 ( 2 ) 32 - 38 2019.12 [Reviewed]

Optimized perforated bulkhead for sloshing mitigation and control

Language：Chinese Publishing type：Research paper (scientific journal) Publisher：Chinese Journal of Ship Research Joint Work

Influence of vertical bending and torsional vibration on statistical characteristics of whipping response of a large container ship based on full-scale measurements

Tetsuji Miyashita, Tetsuo Okada, Yasumi Kawamura, Noriaki Seki, Ryo Hanada

Proceedings of JCOSSAR 2019 2019.10

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：JCOSSAR 2019 Joint Work

A study on sea state estimation using monitoring data of large container ships -Estimation of Directional Wave Spectrum by Machine Learning-

Toshiki Kawai, Nao Ou, Yasumi Kawamura, Tetsuo Okada, Taiga Mitsuyuki, Xi Chen

33rd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2019), Tainan, Taiwan 2019.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

Statistical analysis of vertical and torsional whipping response based on full scale measurement of a large container ship

Ryo Hanada, Tetsuo Okada, Yasumi Kawamura, Tetsuji Miyashita

33rd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2019), Tainan, Taiwan 2019.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

A study on statistical analysis of whipping and correlation with sea states and ship response based on monitoing data of large container ships

Ryotaro Tanaka, Tetsuo Okada, Yasumi Kawamura, Taiga Mitsuyuki, Xi Chen

33rd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2019), Tainan, Taiwan 2019.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

Development of scantling assessment formulae of plate members using elastic-plastic FEM taking account of in-plane stress and aspect ratio effect

Rikuto Umezawa, Yoshiaki Naruse, Tetsuo Okada, Yasumi Kawamura, Kinya Ishibashi, Hiroyuki Koyama

33rd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2019), Tainan, Taiwan 2019.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2019 Joint Work

Cezar Augusto Bellezi, Liang-Yee Cheng, Tetsuo Okada, Makoto Arai

Ocean Engineering Vol.187 ( 1 ) 2019.9 [Reviewed]

Solution of stochastic eigenvalue problem by improved stochastic inverse power method (I-SIPM)

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

Other Link： https://doi.org/10.1016/j.oceaneng.2019.106171

A Study on Scantling Formulae of Plate Members Using Elastic-Plastic FEM

Rikuto Umezawa, Yoshiaki Naruse, Tetsuo Okada, Yasumi Kawamura, Kinya Ishibashi, Hiroyuki Koyama

Conference Proceedings of JASNAOE ( 28 ) 315 - 321 2019.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A Study on Sea State Estimation Using Monitoring Data of Large Container Ships -Estimation of Directional Wave Spectrum by Machine Learning -

Toshiki Kawai, Nao Ou, Yasumi Kawamura, Tetsuo Okada, Taiga Mitsuyuki, Xi Chen

Conference Proceedings of JASNAOE ( 28 ) 177 - 183 2019.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Xi Chen, Yasumi Kawamura, Tetsuo Okada

Journal of Marine Science and Technology 23 ( 4 ) 814 - 834 2018.12 [Reviewed]

Simulation of whipping response of a large container ship fitted with a linear generator on board in irregular head seas

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

Other Link： https://link.springer.com/article/10.1007/s00773-017-0513-3

Full-Scale Measurement of Whipping Related Double Bottom Responses on a 14,000 TEU Container Ship

Jie Chen, Tetsuo Okada, Yasumi Kawamura, Xi Chen

Conference Proceedings of JASNAOE ( 27 ) 511 - 516 2018.11

Language：English Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Numerical Simulation about Ultimate Strength of Container-ship Hull Girder under Dynamic Loading (3rd Report)

Fumiko Tanaka, Yasumi Kawamura, Sho Kotajima, Tetsuo Okada

Conference Proceedings of JASNAOE ( 27 ) 281 - 286 2018.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A Study on the Difference between Declared and Actual Weight Based on Measurement and Consequent Uncertainty as to Still Water Longitudinal Bending Moment

Tetsuo Okada, Misaki Naganuma, Yasumi Kawamura

Conference Proceedings of JASNAOE ( 27 ) 491 - 496 2018.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A comparative study of whipping response of a large container ship based on numerical analysis and full-scale measurements

Tetsuji Miyashita, Tetsuo Okada, Noriaki Seki, Yasumi Kawamura

32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2018), Wuhan, China 510 - 517 2018.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2018 Joint Work

Influences of container cargo weight and its distributions on whipping response of a large container ship

Ayano Oto, Tetsuo Okada, Yasumi Kawamura, Tetsuji Miyashita, Tomoki Nagashima

32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2018), Wuhan, China 502 - 509 2018.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2018 Joint Work

A study on hull girder ultimate strength of a container ship under dynamic loading considering the effect of strain-rate dependency on material properties

Fumiko Tanaka, Sho Kotajima, Yasumi Kawamura, Tetsuo Okada

32nd Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2018), Wuhan, China 67 - 73 2018.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2018 Joint Work

Yuxiao Cheng, Tetsuo Okada, Hiroaki Kobayakawa, Tetsuji Miyashita, Tomoki Nagashima, Isao Neki

Journal of Marine Science and Technology 23 ( 3 ) 706 - 717 2018.9 [Reviewed]

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

Other Link： https://link.springer.com/article/10.1007/s00773-017-0505-3

Sea state estimation using measured hull responses on 14,000TEU large container ships

Chen, X., Okada, T., Kawamura, Y.

Proceedings of the 7th International Maritime Conference on Design for Safety, Kobe, Japan 160 - 168 2018.9 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：DfS2018 Joint Work

Committee IV.1 Design Principles and Criteria

Collette, M., Zhan, Z., Zhu, L., Zanic, V., Okada, T., Arima, T., Skjong, R., Jeong, H.K., Egorov, … Show more authors

Progress in Marine Science and Technology 1 Proceedings of the 20th International Ship and Offshore Structures Congress 1 549 - 607 2018.9 [Reviewed]

Strength evaluation of intersection between stiffeners and primary supporting members considering the effect of shear force on the primary member web

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

Whipping Response Evaluation Based on Monitoring Data of 14,000TEU Large Container Ships

Ryosuke Niki, Xi Chen, Tetsuo Okada, Yasumi Kawamura, Machiko Higashimoto

Conference Proceedings of JASNAOE ( 26 ) 275 - 280 2018.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

On the Effect of Container Cargo Weight on Correlations between Double Bottom Bending and Hull Girder Bending Associated with Whipping

Ayano Oto, Tetsuo Okada, Yasumi Kawamura, Tetsuji Miyashita, Tomoki Nagashima

Conference Proceedings of JASNAOE ( 26 ) 211 - 216 2018.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Tetsuo Okada, Yasumi Kawamura

Marine Structures 59 25 - 46 2018.1 [Reviewed]

Strength Evaluation of Containerships Based on Dynamic Elastic Response Calculation of Hull Girder 1st Rerpot - Influence of Hull Girder Rigidity and Correlation between Double Bottom Bending and Hull Girder Bending

Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier Ltd. Joint Work

Other Link： https://www.sciencedirect.com/science/article/pii/S0951833917303568

Numerical Simulation about Ultimate Strength of Container-ship Hull Girder under Dynamic Loading (Part 2)

Sho Kotajima, Yasumi Kawamura, Tetsuo Okada

Conference Proceedings of JASNAOE ( 25 ) 365 - 370 2017.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Development of Uncertainty Analysis Method for Stochastic Eigenvalue Problems

Xi Chen, Yasumi Kawamura, Tetsuo Okada

Conference Proceedings of JASNAOE ( 25 ) 279 - 284 2017.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Stochastic eigenvalue analysis by improved stochastic inverse power method (I-SIPM)

Xi Chen, Yasumi Kawamura, Tetsuo Okada

31st Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2017), Osaka, Japan 749 - 756 2017.9

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2017 Joint Work

A study on the simple estimation method of stress concentration factor and stress gradient of a cruciform joint under bending and axial load

Tetsuo Okada, Tatsuya Yoshizawa, Yasumi Kawamura

31st Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2017), Osaka, Japan 607 - 614 2017.9

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2017 Joint Work

Yohei Kawasaki, Tetsuo Okada, Hiroaki Kobayakawa, Ichiro Amaya, Tetsuji Miyashita, Tomoki Nagashima … Show more authors

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 25 ) 191 - 203 2017.6 [Reviewed]

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

Other Link： https://www.jstage.jst.go.jp/article/jjasnaoe/25/0/25_191/_article/-char/ja/

A study on the method to estimate ship hull girder ultimate strength considering biaxial compression in bottom stiffened plates

Yoshiaki Naruse, Yasumi Kawamura, Tetsuo Okada

Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2017) Paper No. OMAE2017 - 61430 2017.6 [Reviewed]

Web of Science

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The American Society of Mechanical Engineers Joint Work

A study on forced vibration of double bottom structure due to whipping on an ultra large container ship

Yohei Kawasaki, Tetsuo Okada, Hiroaki Kobayakawa, Ichiro Amaya, Tetsuji Miyashita, Tomoki Nagashima … Show more authors

Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2017) Paper No. OMAE2017 - 61149 2017.6 [Reviewed]

Web of Science

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The American Society of Mechanical Engineers Joint Work

Development of Stochastic Finite Element Method for Problems with Uncertainty in Shape Following Non-normal Distribution

Xi Chen, Yasumi Kawamura, Tetsuo Okada

Conference Proceedings of JASNAOE ( 24 ) 437 - 442 2017.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A study on the estimation method of an ocean wave spectrum using measured hull responses on 14,000TEU large container ships

Yuki Yoshihira, Tetsuo Okada, Yasumi Kawamura, Yuki Terada

Conference Proceedings of JASNAOE ( 24 ) 36 - 42 2017.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Outline of the research project on hull structure health monitoring of 14,000TEU large container ships

Tetsuo Okada, Yasumi Kawamura, Jun Kato, Hideyuki Ando, Takashi Yonezawa, Fumitaka Kimura, Masanobu … Show more authors

Conference Proceedings of JASNAOE ( 24 ) 31 - 35 2017.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Hull Elastic Response Analysis Using Unsteady Time Domain Analysis of Ship Motion (5th Report - Influence of the Ship Speed)

Yohei Kawasaki, Tetsuo Okada, Hiroaki Kobayakawa, Ichiro Amaya, Tetsuji Miyashita, Tomoki Nagashima … Show more authors

Conference Proceedings of JASNAOE ( 24 ) 49 - 52 2017.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Theoretical Strength Assessment of Unstiffened Bilge Shell Plating and Some Considerations on Rule Prescriptions

Tetsuo Okada, Takashi Toyama, Yasumi Kawamura

Journal of Marine Science and Technology 22 ( 1 ) 85 - 100 2017.3 [Reviewed]

A study on the thickness effect on the bending correction coefficient for the fatigue strength of cruciform joint

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

Tetsuo Okada, Kazuki Tatsuta, Yasumi Kawamura

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 24 ) 219 - 226 2016.12 [Reviewed]

Development of structural analysis method with uncertainty in shape to follow non-normal distribution by stochastic finite element method

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

Other Link： https://www.jstage.jst.go.jp/article/jjasnaoe/24/0/24_219/_article/-char/ja/

Hull elastic response analysis using unsteady time domain analysis of ship motion (4th report - Influence of hull girder rigidity and correlation between double bottom bending and hull girder bending)

Yohei Kawasaki, Tetsuo Okada, Hiroaki Kobayakawa, Ichiro Amaya, Tetsuji Miyashita, Tomoki Nagashima … Show more authors

Conference Proceedings of JASNAOE ( 23 ) 345 - 350 2016.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Influence of hull girder flexibility to whipping response of an ultra large container ship

Yohei Kawasaki, Tetsuo Okada, Hiroaki Kobayakawa, Ichiro Amaya, Tetsuji Miyashita, Tomoki Nagashima … Show more authors

30th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2016), Mokpo, Korea 124 - 131 2016.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2016 Joint Work

A study on ultimate strength of container-ship hull girder under dynamic loading

Sho Kotajima, Yasumi Kawamura, Deyu Wang, Tetsuo Okada

30th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2016), Mokpo, Korea 338 - 345 2016.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2016 Joint Work

Theoretical study on structural arrangement to control strength of unstiffened bilge shell plating

Tetsuo Okada, Takashi Toyama, Yasumi Kawamura

13th International Symposium on Practical Design of Ship and Other Floating Structures (PRADS), Copenhagen 2016.9 [Reviewed]

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

Stochastic finite element method based on response surface methodology considering uncertainty in shape of structures

Xi Chen, Yasumi Kawamura, Tetsuo Okada

13th International Symposium on Practical Design of Ship and Other Floating Structures (PRADS), Copenhagen 2016.9 [Reviewed]

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

Xi Chen,Yasumi Kawamura, Tetsuo Okada

Transactions of JSCES 2016 20160019 2016.8 [Reviewed]

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Japan Society for Computational Engineering and Science Joint Work

Other Link： https://www.jstage.jst.go.jp/article/jsces/2016/0/2016_20160019/_article/-char/ja/

A Study on Estimation Method of Ship Hull Girder Ultimate Strength under Biaxial Compression

Yoshiaki Naruse, Yasumi Kawamura, Tetsuo Okada

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 23 ) 239 - 249 2016.6 [Reviewed]

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

A Numerical Study on the Effects of the Perforated Swash Bulkheads on Sloshing Behaviors of Liquid Cargo Tanks

Liang-Yee Cheng, Cezar Augusto Bellezi, Rubens Augusto Amaro Jr, Makoto Arai, Tetsuo Okada

26th International Offshore and Polar Engineering Conference (ISOPE), Rhodes 923 - 930 2016.6 [Reviewed]

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

Numerical simulation about ultimate strength of container ship hull girder under dynamic loading

Sho Kotajima, Yasumi Kawamura, Deyu Wang, Tetsuo Okada

Conference Proceedings of JASNAOE ( 22 ) 547 - 551 2016.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Some considerations on the strength of unstiffened bilge shell plating under lateral pressure and rule prescriptions

Tetsuo Okada, Takashi Toyama, Yasumi Kawamura

Conference Proceedings of JASNAOE ( 22 ) 521 - 526 2016.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

A study on the size effect of cruciform joint for fatigue strength subjected to bending and axial stress

Kazuki Tatsuta, Tetsuo Okada, Yasumi Kawamura

Conference Proceedings of JASNAOE ( 22 ) 457 - 462 2016.5

A Study on the Method of Structural Analysis with Uncertainty in Shape by Stochastic Finite Element Method

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Xi Chen, Yasumi Kawamura, Tetsuo Okada

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 22 ) 187 - 195 2015.12 [Reviewed]

Strength Evaluation of Containerships Based on Dynamic Elastic Response Calculation of Hull Girder 1st Rerpot - Unsteady Time Domain Analysis of Ship Motions in Head Seas

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

Other Link： https://www.jstage.jst.go.jp/article/jjasnaoe/22/0/22_187/_article/-char/ja/

Hiroaki Kobayakawa, Tetsuo Okada, Hiroki Kusumoto, Tomoki Nagashima, Isao Neki

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 22 ) 161 - 173 2015.12 [Reviewed]

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

Other Link： https://www.jstage.jst.go.jp/article/jjasnaoe/22/0/22_161/_article/-char/ja/

A Study on Collapse Behavior and Decrease of Effective Width of Stiffened Plates under Biaxial Compression

Yoshiaki Naruse, Yasumi Kawamura, Tetsuo Okada

Conference Proceedings of JASNAOE ( 21 ) 413 - 418 2015.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Strength of Curved Shell Plating of Ships under Hoop Stress - 2nd Report Verification and Considerations through Finite Element Analysis -

Tetsuo Okada, Junze Lin, Yasumi Kawamura

Conference Proceedings of JASNAOE ( 21 ) 423 - 428 2015.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

An experimental study and numerical simulation of the collapse behavior of the plate under varying load

Miu Hatamura, Yasumi Kawamura, Sho Kotajima, Tetsuo Okada

29th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2015), Vladivostok 43 - 50 2015.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2015 Joint Work

Buckling strength assessment of curved shell plating of ship hulls under hoop stress

Tetsuo Okada, Junze Lin

29th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM2015), Vladivostok 331 - 338 2015.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM2015 Joint Work

Strength of Curved Shell Plating of Ships under Hoop Stress

Tetsuo Okada

Conference Proceedings of JASNAOE ( 20 ) 469 - 472 2015.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Single Work

Analytical and Experimental Study on the Thickness Effect of Fatigue Strength in Large Scale Welded Models

Norio Yamamoto, Masashi Mouri, Tetsuo Okada, Takeshi Mori

Welding in the World 58 ( 3 ) 329 - 337 2014.5 [Reviewed]

Language：English Publishing type：Research paper (scientific journal) Publisher：International Institute of Welding Joint Work

Japanese Joint Research Project on the Thickness Effect to Fatigue Strength

Tetsuo Okada, Norio Yamamoto, Masashi Mouri, Takeshi Mori

Tanker Structure Cooperative Forum 2013 Shipbuilders Meeting, Shanghai 66 - 77 2013.10 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Tanker Structure Cooperative Forum Joint Work

Analytical and Experimental Study on the Thickness Effect to Fatigue Strength

Norio Yamamoto, Masashi Mouri, Tetsuo Okada, Takeshi Mori, Yoichi Sumi

Conference Proceedings of JASNAOE ( 15 ) 151 - 154 2012.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：Japan Society of Naval Architects and Ocean Engineers Joint Work

Materials and Fabrication Technology

Schipperen, I., Andric, J., Brennan, D., Caprace, J.D., Chou, C.M., Gordo, J., Lee, J.H., Li, L., L … Show more authors

18th International Ship and Offshore Structures Congress (ISSC2012) Rostock 2 113 - 152 2012.9 [Reviewed]

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

Analytical and Experimental Study on the Thickness Effect to Fatigue Strength

Norio Yamamoto, Masashi Mouri, Tetsuo Okada, Takeshi Mori

65th Annual Assembly of the International Institute of Welding (IIW), Denver 2012.7

Language：English Publishing type：Research paper (international conference proceedings) Publisher：International Institute of Welding Joint Work

Analytical and Experimental Study on the Thickness Effect to Fatigue Strength (1st Report - Results of Fundamental Specimens)

Norio Yamamoto, Masashi Mouri, Tetsuya Nakamura, Shigeru Tanaka, Tadashi Sugimura, Hiroshi Negayama … Show more authors

22nd International Offshore and Polar Engineering Conference (ISOPE), Rhodes 159 - 165 2012.6 [Reviewed]

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

Double Hull Tanker Structures - Some Practical Considerations about CSR Applications

Tetsuo Okada

Tanker Structure Cooperative Forum 2010 Shipbuilders Meeting, Tokyo 2010.10

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Tanker Structure Cooperative Forum Single Work

Practical Considerations on the Third Generation Fatigue Damage of Slot Cut-out Structure

Noriaki Seki, Tetsuo Okada, Gen Okuzuka

11th International Symposium on Practical Design of Ship and Other Floating Structures (PRADS), Rio de Janeiro 1270 - 1279 2010.9 [Reviewed]

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

Materials and Fabrication Technology

Okada, T., Caprace, J.D., Estefen, S.F., Han, Y., Josefson, L., Kvasnytskyy, V.F., Liu, S., Papazog … Show more authors

17th International Ship and Offshore Structures Congress (ISSC2009) Seoul 2 137 - 200 2009.8 [Reviewed]

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

Full Scale Measurement of Stresses and Deflections of a Post-Panamax Container Ships

Masanobu Toyoda, Tetsuo Okada, Yoshiyuki Nakajima, Tomoki Maeda, Toshiyuki Matsumoto

Journal of the Japan Society of Naval Architects and Ocean Engineers ( 8 ) 267 - 272 2008.12 [Reviewed]

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

Full Scale Measurement of Stress and Deflections of Post-Panamax Container Ship

Masanobu Toyoda, Tetsuo Okada, Tomoki Maeda, Toshiyuki Matsumoto

Design & Operation of Containerships, London 71 - 79 2008.7 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Royal Institute of Naval Architects (RINA) Joint Work

Safety of Mega Container Ship Focusing on Brittle Crack Initiation and Arrest Behavior of Heavy Thickness Plate

Masanobu Toyoda, Noboru Kiji, Yoshiyuki Nakajima, Tetsuo Okada, Yasumasa Nakanishi, Kotaro Inose

27th International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Estoril 2008.6 [Reviewed]

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

大型コンテナ船の応力と倉口変形量の実船計測

豊田昌信、岡田哲男、中島喜之、前田朝樹、松本俊之

日本船舶海洋工学会講演会論文集 ( 6 ) 2008.5

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：日本船舶海洋工学会 Joint Work

Practical Initial Design Optimization of Large Container Ships

Tetsuo Okada, Masanobu Toyoda, Eisuke Kobayashi

10th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS), Houston 574 - 579 2007.10 [Reviewed]

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

On Board Measurement of Stresses and Deflections of a Post-Panamax Containership and its Feedback to Rational Design

Tetsuo Okada, Yu Takeda, Tomoki Maeda

Marine Structures 19 141 - 172 2006.12 [Reviewed]

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

Some Practical Examples of Optimization of Ship's Hull Structure Initial Design

Tetsuo Okada, Masanobu Toyoda, Eisuke Kobayashi

Conference Proceedings of JASNAOE ( 3 ) 135 - 136 2006.11

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：The Japan Society of Naval Architects and Ocean Engineers Joint Work

Advanced Structural Design of Containerships to Achieve Overall Safety and Economy

Masanobu Toyoda, Hiroki Kusumoto, Tetsuo Okada, Eisuke Kobayashi

Design & Operation of Container Ships, London, RINA 31 - 41 2006.11 [Reviewed]

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Royal Institute of Naval Architects Joint Work

Automatic Nesting of Ship Hulls Using the FINEST Algorithm (2nd Report) - Application to Plate Size Determination -

Tomoki Nagashima, Shinichi Matsuoka, Hiromi Tawara, Futoshi Niwa, Tetsuo Okada

IHI Engineering Review 39 ( 1 ) 12 - 17 2006.2

Language：English Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

FINESTアルゴリズムによる鋼板自動ネスティング(第2報)―材料発注用ネスティングへの拡張―

長島智樹、松岡伸一、俵裕美、丹羽太、岡田哲男

石川島播磨技報 45 ( 4 ) 158 - 163 2005.12

Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

Practical Automatic Nesting Algorithm and its Application to Ship Hulls

Futoshi Niwa, Tomoki Nagashima, Hikaru Hirano, Tetsuo Okada

12th International Conference on Computer Applications in Shipbuilding (ICCAS), Busan 83 - 95 2005.8 [Reviewed]

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

Application of Automatic Nesting to Ship Hulls Using the FINEST Algorithm

IHI Engineering Review 38 ( 1 ) 38 - 44 2005.2

Language：English Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

FINESTアルゴリズムによる鋼板自動ネスティングの実用化

長島智樹、丹羽太、平野光、岡田哲男

石川島播磨技報 44 ( 3 ) 229 - 236 2004.5

Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

F.P.TANK内外板ロンジのスロット損傷について

岡田哲男

シンポジウム「損傷に学ぶ」－ライフサイクルコストを考慮した船体構造設計に向けてー 16 - 22 2003.12

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：西部造船会 Single Work

Extensive Finite Element Analyses of Forward and Aft Part of PANAMAX Container Ship

Bungo Matsugi, Yoshinori Date, Tetsuo Okada

16th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM), Kobe 2002.5 [Reviewed]

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

Practical Considerations on Detailed Design of Ship Structure

Shuichiro Tamai, Futoshi Niwa, Masanobu Toyoda, Tetsuo Okada

15th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM), Jochiwon 152 - 159 2001.10 [Reviewed]

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

Ship Structural Design Based on Direct Calculation

Tetsuo Okada, Akinori Abe, Osamu Ushirokawa, Akio Ito, Mamoru Ito, Yoshiyuki Nakajima

IHI Engineering Review 29 ( 3 ) 101 - 108 1996.7

Language：English Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

船舶の波浪荷重推定システムの開発

伊東章雄、岡田哲男、溝口純敏、笹島洋

石川島播磨技報 36 ( 2 ) 98 - 105 1996.3

Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

Wave Forces Acting on a Blunt Ship with Forward Speed in Oblique Sea (4th Report)

Akio Ito, Hidetsugu Iwashita, Tetsuo Okada

Journal of the Society of Naval Architects of Japan ( 178 ) 161 - 168 1995.12 [Reviewed]

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

Structural Optimization of Double Hull Tanker by Genetic Algorithm

Tetsuo Okada, Isao Neki

MARIENV'95, Tokyo 159 - 166 1995.9

Language：English Publishing type：Research paper (international conference proceedings) Publisher：The Society of Naval Architects of Japan Joint Work

直接計算に基づく船体構造設計

岡田哲男、安部昭則、後川理、伊東章雄、伊東護、中島喜之

石川島播磨技報 35 ( 5 ) 363 - 370 1995.7

Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

Otpimum Structural Design Using Genetic Algorithm and Finite Element Method

Journal of the Society of Naval Architects of Japan ( 177 ) 327 - 338 1995.6 [Reviewed]

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

Wave Forces Acting on a Blunt Ship with Forward Speed in Oblique Sea (3rd Report)

Hidetsugu Iwashita, Akio Ito, Tetsuo Okada, Makoto Ohkusu, Mikio Takaki, Sumitoshi Mizoguchi

Journal of the Society of Naval Architects of Japan ( 176 ) 83 - 98 1994.12 [Reviewed]

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

Integrated Hull Condition Monitoring System - Techncal Issues (Hull Design and Construction)

Tetsuo Okada

Integrated Hull Condition Monitoring System (IHCMS) Seminar, Sydney, Tokyo, London 1994.9

Language：English Publishing type：Research paper (research society, symposium materials, etc.) Publisher：BHP Transport Single Work

Wave Forces Acting on a Blunt Ship Advancing in Oblique Short Waves

Hidetsugu Iwashita, Akio Ito, Tetsuo Okada, Makoto Ohkusu, Mikio Takaki, Sumitoshi Mizoguchi

Proceedings of Workshop on Water Waves and Floating Bodies, Kuju 67 - 70 1994

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Workshop on Water Waves and Floating Bodies Joint Work

Wave Forces Acting on a Blunt Ship with Forward Speed in Oblieque Sea (2nd Report)

Hidetsugu Iwashita, Akio Ito, Tetsuo Okada, Makoto Ohkusu, Mikio Takaki, Sumitoshi Mizoguchi

Journal of the Society of Naval Architects of Japan ( 173 ) 195 - 208 1993.5 [Reviewed]

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

Utilization of Genetic Algorithm for Optimizing the Design of Ship Hull Structures

Naval Architecture and Ocean Engineering ( 31 ) 71 - 83 1993

Language：English Publishing type：Research paper (scientific journal) Publisher：The Society of Naval Architects of Japan Joint Work

Improved VLCC/VLBC Design

Ishiguro, T., Okada, T., Kawamura, M.

International Conference on Tankers and Bulk Carriers - the Way Ahead, London Paper No.11 1992.12 [Reviewed]

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

船体運動と波浪荷重

溝口純敏、小林顕太郎、岡田哲男

運動性能研究委員会第9回シンポジウム「耐航性研究と船舶構造設計」 51 - 86 1992.12

Language：Japanese Publishing type：Research paper (research society, symposium materials, etc.) Publisher：日本造船学会 Joint Work

Optimization of Ship Structure Design by Genetic Algorithm

Tetsuo Okada

6th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures (TEAM), Kure 1992.7

Language：English Publishing type：Research paper (international conference proceedings) Publisher：TEAM Single Work

コンテナ船の最適設計プログラムの開発

安部昭則、岡田哲男、根木勲

石川島播磨技報 32 ( 4 ) 260 - 266 1992.7

Language：Japanese Publishing type：Research paper (bulletin of university, research institution) Publisher：IHI Joint Work

Wave Forces Acting on a Blunt Ship with Forward Speed in Oblique Sea

Hidetsugu Iwashita, Akio Ito, Tetsuo Okada, Makoto Ohkusu, Mikio Takaki, Sumitoshi Mizoguchi

Journal of the Society of Naval Architects of Japan ( 171 ) 471 - 485 1992.5 [Reviewed]

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

Optimization of Ship Structural Design by Genetic Algorithm

Tetsuo Okada, Isao Neki

Journal of the Society of Naval Architects of Japan ( 171 ) 103 - 110 1992.5 [Reviewed]