Consideration about approximation of roll restoring moment from the view point of nonlinear dynamics

池上敦規, 酒井政宏

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 39　2024

Numerical Study of Effects of Constant Heel on Maximum Angle of Parametric Roll

酒井政宏, 森川瞭

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 38　2024

Consideration of Effect of Natural Roll Period on Parametric Roll in Long-Crested Irregular Waves Using a Stochastic Averaging Method

藤原大, 酒井政宏, 勝村佳司, 牧敦生

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 38　2024

代表的な音速プロファイルを持つ海域における船舶雑音の伝搬シミュレーション 伝船舶雑音が海生哺乳動物に与える影響の検討

山田知佳, 土屋利雄, 清水悦郎, 酒井政宏

超音波Techno　Vol. 36　No. 2　p. 84-90　2024

Simulation result of the effects of radiation noise from long-distance ships on marine mammals

Chika Yamada, Toshio Tsuchio, Etsuro Shimizu, Masahiro Sakai

INTER-NOISE and NOISE-CON Congress and Conference Proceedings　Vol. 268　No. 6　p. 2133-2139　2023/11/30

Validation of estimated underwater radiated noise propagation from a ship using the parabolic equation method by underwater sound measurements in actual sea

Masahiro Sakai, Yamato Iwashima, Toshio Tsuchiya, Naoya Umeda

INTER-NOISE and NOISE-CON Congress and Conference Proceedings　Vol. 268　No. 5　p. 3989-3997　2023/11/30

Recent Results on Wind and Wave Generation, Stability of Parametric Rolling, Moment Methods and Maneuvering Stability for Ship Dynamics in Irregular Seas

Atsuo Maki, Yuuki Maruyama, Masahiro Sakai, Leo Dostal

Proceedings of the 19th International Ship Stability Workshop　p. 133-139　2023/09

Research on Distinction of Underwater Radiated Noise from a Ship Using CNN

久保田大地, 酒井政宏

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 36　p. 233-235　2023/06

Simulation of ship noise propagation characteristics in the ocean with typical sound speed profiles

山田知佳, 土屋利雄, 清水悦朗, 酒井政宏

海洋音響学会研究発表会講演論文集　Vol. 2023　p. 43-44　2023

The Difference of Variation of Restoring and Parametric Roll Amplitude between in Regular Head Waves and Following Waves without Forward Speed

内田裕太, 河野大雅, 勝村佳司, 酒井政宏

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 37　p. 387-390　2023

The Experimental Verification of the Theoretical Method to Estimate the Roll Amplitude for Parametric Rolling, and the Calculation of the Distribution of the Maxima of Its Roll Amplitudes.

勝村佳司, DOSTAL Leo, 河野大雅, 丸山湧生, 酒井政宏, 牧敦生

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 37　p. 391-394　2023

Study on Variation of Metacentric Height in Iregular Head Waves.

河野大雅, 勝村佳司, 内田裕太, 酒井政宏, 牧敦生

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 37　p. 357-358　2023

Study on the Effect of Natural Roll Period on Parametric Roll in Longitudinal Waves

藤原大, 内田裕太, 酒井政宏

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 37　p. 383-386　2023

Some Remarks on Simplified Operational Guidance for Parametric Rolling

Naoya Umeda, Masahiro Sakai, Hirokazu Okamoto

p. 437-440　2022/11

An Averaging Method for Estimating Parametric Roll in Regular Longitudinal Waves by Uncoupled Roll Model with Restoring Variation due to Vertical Motions

Masahiro Sakai, Umeda Naoya, Atsuo Maki

p. 441-445　2022/11

Complex Sequence of Bifurcation and Chaos in Symmetric Softening Duffing’s Equation

Shinji Kusumi, Masahiro Sakai, Atsuo Maki, Naoya Umeda

Proceedings of the 1st Global Conference on Naval Archtecture and Ocean Engineering　2022/11

Consideration of the difference in Oscillation Mechanism between Ship Parametric Roll and a Swing

Masahiro Sakai, Atsuo Maki

p. 379-385　2022/05

Project for Measuring Underwater Radiated Noise from Ships near Pacific Islands off Japan

Masahiro Sakai, Soma Oizumi, Kengo Yasumoto, Naoya Umeda

Proceedings of 7th World Maritime Technology Conference　2022/04

Wind Process Generation Algorithm for Examining Autonomous Operating Systems of Ships (2nd Report)

牧敦生, 丸山湧生, DOSTAL Leo, 笹健児, 澤田涼平, 澤田涼平, 脇田康希, 酒井政宏, 梅田直哉

日本船舶海洋工学会講演会論文集(CD-ROM)　No. 34　p. 65-75　2022

Numerical Investigation on Loss of Symmetry of Ship Roll Motion in Beam Waves

Masahiro Sakai, Atsuo Maki, Naoya Umeda

Proceedings of International Conference on PAAMES/AMEC 2021　2021/09

Normal Mode法による船舶航行雑音推定手法の研究

山田知佳, 土屋利雄, 清水悦郎, 酒井政宏

超音波研究会，電子情報通信学会超音波研究会　2021/08

An investigation into false-negative cases for low freeboard ships in vulnerability criteria of dead ship stability

Satoko Munakata, Kosuke Takagaki, Naoya Umeda, Masahiro Sakai, Hiroaki Koike, Atsuo Maki, Kohei Manabe, Akihiko Matsuda

Proceedings of the 1st International Conference on the Stability and Safety of Ships and Ocean Vehicles　2021/06

Bifurcations in roll responses of uncoupled parametric roll equation and its estimation by an averaging method

Masahiro Sakai, Atsuo Maki, Naoya Umeda

Proceedings of 1st International Conference on the Stability and Safety of Ships and Ocean Vehicles　2021/06

New aspects of stochastic evaluation of random roll motion of ships

Atsuo Maki, Leo Dostal, Yuuki Maruyama, Masahiro Sakai, Naoya Umeda

Proceedings of 1st International Conference on the Stability and Safety of Ships and Ocean Vehicles　2021/06

海中設置ハイドロフォンによる航行船舶放射雑音の測定と音源推定について

山田知佳, 清水悦郎, 酒井政宏, 土屋利雄

海洋音響学会 第37回研究発表会　2021/05

Measurement of Underwater Radiated Ship Noise in Shallow Sea and Estimation of Its Source Level by Normal Mode Method

Masahiro Sakai, Soma Oizumi, Kengo Yasumoto, Takaya Miyoshi, Koki Tsujii, Tomonari Akamatsu, Naoya Umeda

Conference Proceedings of the Japan Society of Naval Archtects and Ocean Engineers　p. 435-438　2020/11

Theoretical Estimation of Roll Amplitude for Nonlinear Equation of Motion in Beam Seas

Atsuo Maki, Leo Dostal, Yuuki Maruyama, Munehiko Minoura, Toru Katayama, Masahiro Sakai, Kei Sugimoto, Yusuke Fukumoto, Naoya Umeda

日本船舶海洋工学会秋季講演会論文集　Vol. 29　p. 317-320　2019/11

New Theoretical Estimation Method of Roll Acceleration and Jerk in Beam Seas with Use of PDF Line Integral

Atsuo Maki, Leo Dostal, Yuuki Maruyama, Munehiko Minoura, Toru Katayama, Masahiro Sakai, Kei Sugimoto, Yusuke Fukumoto, Naoya Umeda

日本船舶海洋工学会秋季講演会論文集　Vol. 29　p. 311-315　2019/11

Wave radar application to the simplified parametric roll operational guidance at actual sea

Takehiro Yano, Naoya Umeda, Keiichi Hirayama, Mitsunori Baba, Masahiro Sakai

Proceedings of the 17th International Ship Stability Workshop　p. 91-96　2019/06

A perspective on theoretical estimation of stochastic nonlinear rolling

Atsuo Maki, Yuuki Maruyama, Naoya Umeda, Yuu Miino, Toru Katayama, Masahiro Sakai, Tetsushi Ueta

Proceedings of the 17th International Ship Stability Workshop　p. 39-46　2019/06

On the approximate estimation of a non-Gaussian probability density function in irregular beam seas

Maki, A, Kaneda, T, Okumura, Y, Ono, Y, Sakai, M, Umeda, N

p. 581-585　2019/06

Nonlinearity in Effective Wave Slope Coefficient for a Low Freeboard Ship

Naoya Umeda, Masahiro Sakai, Atsuo Maki, Kohei Manabe, Akihiko Matsuda

p. 27-30　2019/06

Symmetry-breaking Bifurcations in the Roll Response of Floating Vessels

Maki, A, Virgin, L.N, Umeda, N, Miino, Y, Sakai, M, Kawakami, H

p. 247-251　2018/11

On the approximate estimation of a non-Gaussian probability density function in irregular beam seas

Maki, A, Sakai, M, Umeda, N

p. 247-251　2018/11

Water-on-Deck Effects on Roll Motions of an Offshore Supply Vessel in Regular Stern Quartering Waves

Su Sandy Htun, Naoya Umeda, Masahiro Sakai, Akihiko Matsuda, Daisuke Terada

p. 252-260　2018/09

Encounter Frequency Effect on the Simplified Design Criteria against Parametric Roll

Masahiro Sakai, Naoya Umeda, Atsuo Maki

p. 252-260　2018/09

Model Experiment on Pure Loss of Stability for a Ship in Astern Waves and Its Relationship with the Second Generation Intact Stability Criteria.

Naoya Umeda, Mizuki Osugi, Masahiro Sakai, Akihiko Matsuda, Daisuke Terada

p. 21-26　2017/06

Theoretical Prediction of Parametric Roll with Its Superharmonics Taken into Account

Yano, T, Sakai, M, Maki, A, Umeda, N

p. 601-603　2017/05

Theoretical Estimation of Parametric Roll without Any Polynomial Approximation of Calm-Water GZ Curve

Masahiro Sakai, Atsuo Maki, Naoya Umeda

p. 315-317　2017/05

Analytical Solution of Critical Speed for Surf-Riding in the light of Melnikov Analysis

Masahiro Sakai, Atsuo Maki, Taiki Murakami, Naoya Umeda, Daisuke Terada, Akihiko Matsuda

p. 311-314　2017/05

The Relationship between Parametric Roll in Secondary Unstable Regions and Pure Loss of Stability

p. 291-294　2017/05

Safety Level Required by the IMO Second Generation Intact Stability Criteria for Ships under Dead Ship Condition and Parametric Roll Resonance

Proceedings of the 6th International Maritime Conference on Design for Safety　p. 153-157　2016/11

Parametric Roll of a Car Carrier in Short Longitudinal Waves

Manabu Takabayashi, Naoya Umeda, Masahiro Sakai, Daisuke Terada, Akihiko Matsuda

Proceedings of the 8th Asia-Pacific Workshop on Marine Hydrodynamics in Naval Architecture, Ocean Technology and Constructions　p. 232-237　2016/09

Numerical Prediction of Parametric Roll Resonance in Oblique Waves

Naoya Umeda, Naoki Fujita, Ayumi Morimoto, Masahiro Sakai, Daisuke Terada, Akihiko Matsuda

Proceedings of the 12th International Conference on the Stability of Ships and Ocean Vehicles　p. 331-340　2015/06

Direct Estimation of Maximum Amplitude of Ship Parametric Roll in Longitudinal Waves

Sakai, M, Yamashita, N, Umeda, N

No. 19　p. 379-381　2014/11

Estimation of Oblique-Wave Parametric Rolling Amplitude Using an Averaging Method

Proceedings of the Second International Symposium on Naval Architecture and Maritime　p. 579-588　2014/10