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Tomoaki Utsunomiya
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Proceedings Papers

Experimental and Numerical Investigation of the Inlet Effect on the Dynamics of a Water Intake Pipe

Ryoya Hisamatsu, Yusei Yamaguchi, Carlos A. Riveros-Jerez, Tomoaki Utsunomiya
Proc. ASME. OMAE2024, Volume 6: Polar and Arctic Sciences and Technology; CFD, FSI, and AI, V006T08A047, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-124537
https://doi.org/10.1115/OMAE2024-124537
View Paper titled, Experimental and Numerical Investigation of the Inlet Effect on the Dynamics of a Water Intake Pipe
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Topics: Dynamics (Mechanics), Excitation, Internal flow, Pipeline risers, Pipes, Risers (Casting), Water
Proceedings Papers

Development of a Test Machine and Wear Test to Reproduce the Wear Caused by the Mooring Chain Connection of Floating Wind Turbines Sliding in Water due to the Movement of the Floating Body

Koji Gotoh, Koji Murakami, Tomoaki Utsunomiya
Proc. ASME. OMAE2024, Volume 3: Materials Technology; Subsea Technology, V003T03A008, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-124126
https://doi.org/10.1115/OMAE2024-124126
View Paper titled, Development of a Test Machine and Wear Test to Reproduce the Wear Caused by the Mooring Chain Connection of Floating Wind Turbines Sliding in Water due to the Movement of the Floating Body
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Topics: Chain, Floating bodies, Floating wind turbines, Machinery, Mooring, Water, Wear, Wear testing
Proceedings Papers

Dynamics of a Cold Water Intaking Pipe Subject to Internal Flow and Motion Excitation

Ryoya Hisamatsu, Tomoaki Utsunomiya
Proc. ASME. OMAE2023, Volume 4: Ocean Space Utilization, V004T05A015, June 11–16, 2023
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2023-103375
https://doi.org/10.1115/OMAE2023-103375
View Paper titled, Dynamics of a Cold Water Intaking Pipe Subject to Internal Flow and Motion Excitation
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Topics: Dynamics (Mechanics), Excitation, Internal flow, Ocean thermal energy conversion, Pipeline risers, Pipes, Risers (Casting), Water
Proceedings Papers

Finite Element Modelling of Ocean Thermal Energy Conversion (OTEC) Cold Water Pipe (CWP)

Ristiyanto Adiputra, Tomoaki Utsunomiya
Proc. ASME. OMAE2022, Volume 4: Ocean Space Utilization, V004T05A012, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-78135
https://doi.org/10.1115/OMAE2022-78135
View Paper titled, Finite Element Modelling of Ocean Thermal Energy Conversion (OTEC) Cold Water Pipe (CWP)
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Topics: Finite element analysis, Internal flow, Modeling, Ocean thermal energy conversion, Water pipes
Proceedings Papers

Experimental Study on Dynamic Characteristics of Fluid-Conveying Pipe for OTEC

Ryoya Hisamatsu, Ristiyanto Adiputra, Tomoaki Utsunomiya
Proc. ASME. OMAE2022, Volume 4: Ocean Space Utilization, V004T05A013, June 5–10, 2022
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2022-78136
https://doi.org/10.1115/OMAE2022-78136
View Paper titled, Experimental Study on Dynamic Characteristics of Fluid-Conveying Pipe for OTEC
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Topics: Fluids, Ocean thermal energy conversion, Pipes, Water pipes
Proceedings Papers

Simplified Formulation of Coupled System Between Moored Ship and Elastic Pipe for OTEC Plantship

Ryoya Hisamatsu, Tomoaki Utsunomiya
Proc. ASME. OMAE2021, Volume 5: Ocean Space Utilization, V005T05A011, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62122
https://doi.org/10.1115/OMAE2021-62122
View Paper titled, Simplified Formulation of Coupled System Between Moored Ship and Elastic Pipe for OTEC Plantship
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Topics: Mooring, Ocean thermal energy conversion, Pipes, Ships, Water pipes
Proceedings Papers

Development of Simplified Wear Estimation Method Considering Rolling Motion Between Mooring Chain Links for Floating Structures

Takaaki Takeuchi, Tomoaki Utsunomiya, Koji Gotoh, Iku Sato
Proc. ASME. OMAE2021, Volume 5: Ocean Space Utilization, V005T05A016, June 21–30, 2021
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2021-62574
https://doi.org/10.1115/OMAE2021-62574
View Paper titled, Development of Simplified Wear Estimation Method Considering Rolling Motion Between Mooring Chain Links for Floating Structures
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Topics: Chain, Finite element analysis, Floating structures, Floating wind turbines, Mooring, Wear
Proceedings Papers

Quantitative Wear Estimation for Floating Structures by Using 3-D Geometry of Mooring Chain

Takaaki Takeuchi, Tomoaki Utsunomiya, Koji Gotoh, Iku Sato
Proc. ASME. OMAE2020, Volume 5: Ocean Space Utilization, V005T05A012, August 3–7, 2020
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2020-18409
https://doi.org/10.1115/OMAE2020-18409
View Paper titled, Quantitative Wear Estimation for Floating Structures by Using 3-D Geometry of Mooring Chain
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Topics: Chain, Floating structures, Floating wind turbines, Geometry, Mooring, Wear
Proceedings Papers

Wear Performance of Mooring Chain in Wet Environment With Substitute Ocean Water

Koji Gotoh, Tetsuya Ueda, Koji Murakami, Tomoaki Utsunomiya
Proc. ASME. OMAE2019, Volume 4: Materials Technology, V004T03A045, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95822
https://doi.org/10.1115/OMAE2019-95822
View Paper titled, Wear Performance of Mooring Chain in Wet Environment With Substitute Ocean Water
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Topics: Chain, Mooring, Oceans, Water, Wear, Finite element analysis, Floating wind turbines, Seas, Seawater, Evaluation methods
Proceedings Papers

At-Sea Experiment on Durability and Residual Strength of Polyester Rope for Mooring of Floating Wind Turbine

Tomoaki Utsunomiya, Iku Sato, Koji Tanaka
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T13A017, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95388
https://doi.org/10.1115/OMAE2019-95388
View Paper titled, At-Sea Experiment on Durability and Residual Strength of Polyester Rope for Mooring of Floating Wind Turbine
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Topics: Durability, Floating wind turbines, Mooring, Offshore wind turbines, Polyester fabrics, Ropes, Seas
Proceedings Papers

Stability Analysis of Free Hanging Riser Conveying Fluid for Ocean Thermal Energy Conversion (OTEC) Utilization

Ristiyanto Adiputra, Tomoaki Utsunomiya
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T13A031, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96749
https://doi.org/10.1115/OMAE2019-96749
View Paper titled, Stability Analysis of Free Hanging Riser Conveying Fluid for Ocean Thermal Energy Conversion (OTEC) Utilization
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Topics: Fluids, Ocean thermal energy conversion, Pipeline risers, Risers (Casting), Stability, Aluminum, Fiber reinforced plastics, Numerical analysis, Steel, Boundary-value problems
Proceedings Papers

Quantitative Wear Estimation for Mooring Chain of Floating Structures and its Validation

Takaaki Takeuchi, Tomoaki Utsunomiya, Koji Gotoh, Iku Sato
Proc. ASME. OMAE2019, Volume 6: Ocean Space Utilization, V006T05A017, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-96750
https://doi.org/10.1115/OMAE2019-96750
View Paper titled, Quantitative Wear Estimation for Mooring Chain of Floating Structures and its Validation
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Topics: Chain, Floating structures, Mooring, Offshore wind turbines, Wear
Proceedings Papers

Comparison of Dynamic Response in a 2MW Floating Offshore Wind Turbine During Typhoon Approaches

Koji Tanaka, Iku Sato, Tomoaki Utsunomiya, Hiromu Kakuya
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T13A026, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95889
https://doi.org/10.1115/OMAE2019-95889
View Paper titled, Comparison of Dynamic Response in a 2MW Floating Offshore Wind Turbine During Typhoon Approaches
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Topics: Dynamic response, Offshore wind turbines
Proceedings Papers

Irregular Frequency Removal and Convergence in Higher-Order BEM for Wave Diffraction/Radiation Analysis

Tomoaki Utsunomiya
Proc. ASME. OMAE2019, Volume 9: Rodney Eatock Taylor Honoring Symposium on Marine and Offshore Hydrodynamics; Takeshi Kinoshita Honoring Symposium on Offshore Technology, V009T12A022, June 9–14, 2019
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2019-95482
https://doi.org/10.1115/OMAE2019-95482
View Paper titled, Irregular Frequency Removal and Convergence in Higher-Order BEM for Wave Diffraction/Radiation Analysis
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Topics: Boundary element methods, Diffraction, Radiation (Physics), Waves
Journal Articles

Numerical Modeling and Analysis of a Hybrid-Spar Floating Wind Turbine

Tomoaki Utsunomiya, Iku Sato, Osamu Kobayashi, Takashi Shiraishi, Takashi Harada
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. June 2019, 141(3): 031903.
Paper No: OMAE-17-1221
https://doi.org/10.1115/1.4041994
Published Online: January 17, 2019
View Article titled, Numerical Modeling and Analysis of a Hybrid-Spar Floating Wind Turbine
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Topics: Computer simulation, Energy generation, Floating wind turbines, Simulation, Spar platforms, Wing spars, Stress, Wind turbines, Design, Dynamic analysis
Proceedings Papers

Design Optimization of Floating Structure for a 100 MW-Net Ocean Thermal Energy Conversion (OTEC) Power Plant

Ristiyanto Adiputra, Tomoaki Utsunomiya
Proc. ASME. OMAE2018, Volume 10: Ocean Renewable Energy, V010T09A016, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-77539
https://doi.org/10.1115/OMAE2018-77539
View Paper titled, Design Optimization of Floating Structure for a 100 MW-Net Ocean Thermal Energy Conversion (OTEC) Power Plant
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Topics: Design, Floating structures, Ocean thermal energy conversion, Optimization, Power stations, Ships, Tankers, Seawater, Fluids, Pipeline risers
Proceedings Papers

On-Site Measurement and Numerical Modelling of a Lifting Operation for Caissons Using Floating Crane

Sho Oh, Tomoaki Utsunomiya, Kota Saiki
Proc. ASME. OMAE2018, Volume 6: Ocean Space Utilization, V006T05A020, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-77132
https://doi.org/10.1115/OMAE2018-77132
View Paper titled, On-Site Measurement and Numerical Modelling of a Lifting Operation for Caissons Using Floating Crane
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Topics: Caissons, Crane barges, Modeling, Computer simulation, Displacement, Friction, Maintenance, Multibody dynamics, Offshore wind turbines, Ropes
Proceedings Papers

Effect of Tensile Force for Wear Performance of Mooring Chain

Koji Gotoh, Masataka Nakagawa, Koji Murakami, Tomoaki Utsunomiya
Proc. ASME. OMAE2018, Volume 4: Materials Technology, V004T03A012, June 17–22, 2018
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2018-77960
https://doi.org/10.1115/OMAE2018-77960
View Paper titled, Effect of Tensile Force for Wear Performance of Mooring Chain
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Topics: Chain, Mooring, Wear, Floating wind turbines, Seas, Evaluation methods, Finite element analysis, Maintenance, Numerical analysis, Renewable energy
Proceedings Papers

Demonstration Test for Using Suction Anchor and Polyester Rope in Floating Offshore Wind Turbine

Tomoaki Utsunomiya, Kinji Sekita, Katsutoshi Kita, Iku Sato
Proc. ASME. OMAE2017, Volume 10: Ocean Renewable Energy, V010T09A082, June 25–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2017-62197
https://doi.org/10.1115/OMAE2017-62197
View Paper titled, Demonstration Test for Using Suction Anchor and Polyester Rope in Floating Offshore Wind Turbine
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Topics: Offshore wind turbines, Polyester fabrics, Ropes, Suction, Soil, Design methodology, Dimensions, Floating wind turbines, Mooring, Pressure
Proceedings Papers

Wear Performance of the Mooring Chain Used in Floating Wind Turbines

Koji Gotoh, Koji Murakami, Masataka Nakagawa, Tomoaki Utsunomiya
Proc. ASME. OMAE2017, Volume 4: Materials Technology, V004T03A032, June 25–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2017-62195
https://doi.org/10.1115/OMAE2017-62195
View Paper titled, Wear Performance of the Mooring Chain Used in Floating Wind Turbines
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Topics: Chain, Floating wind turbines, Mooring, Wear, Computer simulation, Damage, Evaluation methods, Finite element model, Floating bodies, Ocean engineering