Kyushu University Academic Staff Educational and Research Activities Database
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TOMOAKI UTSUNOMIYA Last modified date:2020.01.16



Graduate School
Undergraduate School


E-Mail
Phone
092-802-3447
Fax
092-802-3368
Academic Degree
Doctor of Engineering
Field of Specialization
Ocean Energy Resources Engineering
ORCID(Open Researcher and Contributor ID)
0000-0003-2081-7547
Outline Activities
Research on fundamental technology for utilization of ocean renewable energy
Research
Research Interests
  • Research on fundamental technology for utilization of ocean renewable energy
    keyword : ocean renewable energy, floating wind turbine, floating offshore wind power generation, OTEC
    2014.04~2020.03.
Academic Activities
Books
1. Tomoaki Utsunomiya, Iku Sato, Takashi Shiraishi, Floating Offshore Wind Turbines in Goto Islands, Nagasaki, Japan, Springer, 10.1007/978-981-13-8743-2_20, 359-372, 2020.01, Offshore wind energy resources in Japanese EEZ are now considered to be huge. In order to utilize the huge amount of energy located in relatively deep water areas, Ministry of the Environment, Japan funded a demonstration project on floating offshore wind turbine (FOWT). In the project, two FOWTs have been installed. The first FOWT mounted a 100 kW wind turbine of downwind type, and the length dimensions are almost half of the second FOWT. The second FOWT mounted a 2 MW wind turbine of downwind type, and was referred to as the full-scale model. The FOWTs consist of PC-steel hybrid spar which is cost-effective and are moored by three mooring chains. The half-scale model was installed at the site (Kabashima, Goto Islands, Nagasaki prefecture, Japan) on 11 June 2012. The half-scale model was attacked by a very severe typhoon Sanba (1216). The behavior of the half-scale model during the typhoon attack was recorded, and compared with the computer simulations, indicating the validity of the design method. After a successful demonstration test of the half-scale model, the full-scale model was designed, constructed and installed at the same site. The demonstration test for the full-scale model was also successful. After completion of the demonstration project, the full-scale model was moved to a different site off Fukue island, where future expansion as a floating wind farm is planned. There, the full-scale model is operating as a commercial floating wind turbine, providing valuable data and experience for operation and maintenance toward commercial-scale floating wind farms..
2. Zhen Gao, Harry B. Bingham, David Ingram, Athanasios Kolios, Debabrata Karmakar, Tomoaki Utsunomiya, Ivan Catipovic, Giuseppina Colicchio, Jose Miguel Rodrigues, Frank Adam, Dale G. Karr, Chuang Fang, Hyun-Kyoung Shin, Johan Slatte, Chunyan Ji, Wanan Sheng, Pengfei Liu, Lyudmil Stoev, Proceedings of the 20th International Ship and Offshore Structures Congress 2018 9-13 September 2018, Liege - Belgium & Amsterdam - The Netherlands, Report of Committee V.4 Offshore Renewable Energy, ISSC, 2018.09.
3. D. Roddier, C. Cermelli, J. Weinstein, E. Byklum, M. Atcheson, T. Utsunomiya, J. Jorde, E. Borgen, State-of-the-Art, in "Floating Offshore Wind Energy - The Next Generation of Wind Energy", Springer International Publishing, 2016.09.
4. C. M. WANG, E. WATANABE, T. UTSUNOMIYA, Very Large Floating Structures (Spon Research), Taylor and Francis, 2007.09.
Papers
1. Ristiyanto Adiputra, Tomoaki Utsunomiya, Stability based approach to design cold-water pipe (CWP) for ocean thermal energy conversion (OTEC), Applied Ocean Research, 10.1016/j.apor.2019.101921, 92, 2019.11, Cold-water pipe (CWP) is a novel, most-challenging component of Ocean Thermal Energy Conversion (OTEC) floating structure which is installed to transport the deep seawater to the board. For commercial scale, the transported seawater flow rate will be in the order of 10^2 m^3/s. This large amount of internal flow may trigger instability which leads to the failure of CWP. Considering this issue, the present paper aims to design commercial-scale OTEC CWP focusing on the effects of internal flow to the stability of the pipe. The design analysis is deliberated to select the pipe material, top joint configuration (fixed, flexible, pinned) and bottom supporting system (with and without clump weight). Initially, the analytical solution is built by taking into account the components of the pipe dynamics. Separately, a fully coupled fluid-structure interaction analysis between the pipe and the ambient fluid is carried out using ANSYS interface. Using scale models, the results obtained from the analytical solution are compared with the ones from numerical analysis to examine the feasibility of the analytical solution. After being verified, the analytical solution is used to observe the dynamic behavior of the CWP for 100 MW-net OTEC power plant in the full-scale model. The results yield conclusions that pinned connection at the top joint is preferable to decrease the applied stress, clump weight installation is necessary to reduce the motion displacement and Fiber Reinforced Plastic (FRP) is the most suitable material among the examined materials..
2. Ristiyanto Adiputra, Tomoaki Utsunomiya, Jaswar Koto, Takeshi Yasunaga, Yasuyuki Ikegami, Preliminary design of a 100 MW-net ocean thermal energy conversion (OTEC) power plant study case: Mentawai island, Indonesia, Journal of Marine Science and Technology, https://doi.org/10.1007/s00773-019-00630-7, 2019.02, Ocean thermal energy conversion is one of the promising renewable energy resources yet relatively unexplored due to its high capital cost for being utilized in commercial scale. In the aim to reduce the capital cost, this paper introduces a concept design of the floating structure from a converted oil tanker ship. To propose the design process, the general principles of designing a converted tanker FPSO is adapted and then modified to deal with ocean thermal energy conversion (OTEC) characteristic. In the design process, the arrangement of the OTEC layout is carried out by constraint satisfaction method and the prospective floating structure size is varied using Monte Carlo simulation. The variables in the design process consist of the velocities of cold water and warm water transport, the size of the plantship, and the location of the OTEC equipment to the seawater tank. Constraints are introduced as allowable border to determine the acceptability for particular case including the provided space and buoyancy, and the net power output estimation. The results show that the ‘typical’ size of a Suezmax oil tanker ship is the optimum one for the plantship with the velocity of the water transport of 2–3 m/s. The general arrangement is also conceptualized in this paper..
3. Utsunomiya, T., Sato, I., Kobayashi, O., Shiraishi, T., Harada, T., Numerical Modeling and Analysis of a Hybrid-Spar Floating Wind Turbine, Journal of Offshore Mechanics and Arctic Engineering, ASME, 10.1115/1.4041994, 141, 3, 031903-1-031903-5, 2019.01.
4. Jian Dai, Chien Ming Wang, Tomoaki Utsunomiya, Wenhui Duan, Review of recent research and developments on floating breakwaters, Ocean Engineering, https://doi.org/10.1016/j.oceaneng.2018.03.083, 158, 132-151, 2018.06.
5. Koji Gotoh, Koji Murakami, Masataka Nakagawa and Tomoaki Utsunomiya, Wear Performance of the Mooring Chain Used in Floating Wind Turbines, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, 10.1115/OMAE2017-62195, 2017.06.
6. Tomoaki Utsunomiya, Kinji Sekita, Katsutoshi Kita and Iku Sato, Demonstration Test for Using Suction Anchor and Polyester Rope in Floating Offshore Wind Turbine, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, 10.1115/OMAE2017-62197, 2017.06.
7. Tomoaki Utsunomiya, Iku Sato, Osamu Kobayashi, Takashi Shiraishi and Takashi Harada, Numerical Modelling and Analysis of a Hybrid-Spar Floating Wind Turbine, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, 10.1115/OMAE2017-62578, 2017.06.
8. T. UTSUNOMIYA, I. SATO, O. KOBAYASHI, T. SHIRAISHI, T. HARADA, Design and Installation of a Hybrid-Spar Floating Wind Turbine Platform, Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, 10.1115/OMAE2015-41544, 2015.05.
9. T. UTSUNOMIYA, S. YOSHIDA, H. OOKUBO, I. SATO, S. ISHIDA, Dynamic analysis of a floating offshore wind turbine under extreme environmental conditions, Journal of Offshore Mechanics and Arctic Engineering, ASME, 10.1115/1.4025872, 136, 2, 020904, 2014.03, [URL].
10. K. SHIBANUMA, T. UTSUNOMIYA, S. AIHARA, An explicit application of partition of unity approach to XFEM approximation for precise reproduction of a priori knowledge of solution, International Journal for Numerical Methods in Engineering, 10.1002/nme.4593, 97, 8, 551-581, 2014.02.
11. T. UTSUNOMIYA, H. MATSUKUMA, S. MINOURA, K. KO, H. HAMAMURA, O. KOBAYASHI, I. SATO, Y. NOMOTO, K. YASUI, At-sea experiment of a hybrid spar for floating offshore wind turbine using 1/10-scale model, Journal of Offshore Mechanics and Arctic Engineering, ASME, 10.1115/1.4024148, 135, 3, 034503, 2013.08.
12. Ishida, S., Kokubun, K., Nimura, T., Utsunomiya, T., Sato, I., Yoshida, S., AT-SEA EXPERIMENT OF A HYBRID SPAR TYPE OFFSHORE WIND TURBINE, PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 8, 10.1115/OMAE2013-10655, V008T09A035, 2013.06.
13. Utsunomiya, T., Sato, I., Yoshida, S., Ookubo, H., Ishida, S, DYNAMIC RESPONSE ANALYSIS OF A FLOATING OFFSHORE WIND TURBINE DURING SEVERE TYPHOON EVENT, PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 8, 10.1115/OMAE2013-10618, V008T09A032, 2013.06.
14. Utsunomiya, T., Yoshida, S., Ookubo, H., Sato, I., Ishida, S., DYNAMIC ANALYSIS OF A FLOATING OFFSHORE WIND TURBINE UNDER EXTREME ENVIRONMENTAL CONDITIONS, PROCEEDINGS OF THE ASME 31ST INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARTIC ENGINEERING, VOL 7, 10.1115/OMAE2012-83985, 559-568, 2012.07.
15. Kokubun, K., Ishida, S., Nimura, T., Chujo, T., Yoshida, S., Utsunomiya, T., MODEL EXPERIMENT OF A SPAR TYPE OFFSHORE WIND TURBINE IN STORM CONDITION, PROCEEDINGS OF THE ASME 31ST INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARTIC ENGINEERING, VOL 7, 10.1115/OMAE2012-83993, 569-575, 2012.06.
16. K. SHIBANUMA, T. UTSUNOMIYA, Evaluation on reproduction of priori knowledge in XFEM, Finite Elements in Analysis and Design, 10.1016/j.finel.2010.11.007, 47, 4, 424-433, 2011.04.
17. C. M. WANG, T. UTSUNOMIYA, S. C. WEE, Y. S. CHOO, Research on floating wind turbines: a literature survey, IES Journal Part A: Civil & Structural Engineering, 3, 4, 267-277, 2010.10.
18. C. M. WANG, Z. Y. TAY, K. TAKAGI, T. UTSUNOMIYA, Literature review of methods for mitigating hydroelastic response of VLFS under wave action, Applied Mechanics Reviews, 10.1115/1.4001690, 63, 3, 030802, 2010.06.
19. E. P. BANGUN, C. M. WANG, T. UTSUNOMIYA, Hydrodynamic forces on a rolling barge with bilge keels, Applied Ocean Research, 10.1016/j.apor.2009.10.008, 32, 2, 219-232, 2010.04.
20. C. A. RIVEROS, T. UTSUNOMIYA, K. MAEDA, K. ITOH, Response prediction of long flexible risers subject to forced harmonic vibration, Journal of Marine Science and Technology, 15, 1, 44-53, 2010.03.
21. K. SHIBANUMA, T. UTSUNOMIYA, Reformulation of XFEM based on PUFEM for solving problem caused by blending elements, Finite Elements in Analysis and Design, 45, 11, 806-816, 2009.09.
22. Z. Y. TAY, C. M. WANG, T. UTSUNOMIYA, Hydroelastic responses and interactions of floating fuel storage modules placed side-by-side with floating breakwaters, Marine Structures, 22, 3, 633-658, 2009.07.
23. C. RIVEROS, T. UTSUNOMIYA, K. MAEDA, K. ITOH, Dynamic response of oscillating flexible risers under lock-in events, International Journal of Offshore and Polar Engineering, 19, 1, 23-30, 2009.03.
24. H. MATSUKUMA, T. UTSUNOMIYA, Motion analysis of a floating offshore wind turbine considering rotor-rotation, The IES Journal Part A: Civil and Structural Engineering, 1, 4, 268-279, 2008.10.
25. D. C. PHAM, C. M. WANG, T. UTSUNOMIYA, Hydroelastic analysis of pontoon-type circular VLFS with an attached submerged plate, Applied Ocean Research, 30, 4, 287-296, 2008.10.
26. C. RIVEROS, T. UTSUNOMIYA, K. MAEDA, K. ITOH, Damage detection in flexible risers using statistical pattern recognition techniques, International Journal of Offshore and Polar Engineering, 18, 1, 35-42, 2008.03.
27. T. UTSUNOMIYA, T. OKAFUJI, Wave response analysis of a VLFS by accelerated Green's function method in infinite water depth, International Journal of Offshore and Polar Engineering, 17, 1, 30-38, 2007.03.
28. C. M. WANG, W. X. WU, C. SHU, T. UTSUNOMIYA, LSFD method for accurate vibration modes and modal stress-resultants of freely vibrating plates that model VLFS, Computers and Structures, 84, 31-32, 2329-2339, 2006.12.
29. T. UTSUNOMIYA, E. WATANABE, Fast multipole method for wave diffraction/radiation problems and its applications to VLFS, International Journal of Offshore and Polar Engineering, 16, 4, 253-260, 2006.12.
30. S. KIDA, T. UTSUNOMIYA, Analysis of the slowly varying drift force on a very large floating structure in multidirectional random seas, Journal of Marine Science and Technology, 11, 4, 229-236, 2006.12.
31. E. WATANABE, T. UTSUNOMIYA, C. M. WANG, L. T. T. HANG, Benchmark hydroelastic responses of a circular VLFS under wave action, Engineering Structures, 28, 3, 423-430, 2006.02.
32. N. MAKIHATA, T. UTSUNOMIYA, E. WATANABE, Effectiveness of GMRES-DR and OSP-ILUC for wave diffraction analysis of a very large floating structure (VLFS), Engineering Analysis with Boundary Elements, 30, 1, 49-58, 2006.01.
33. C. M. WANG, Y. XIANG, E. WATANABE, T. UTSUNOMIYA, Mode shapes and stress-resultants of circular Mindlin plates with free edges, Journal of Sound and Vibration, 276, 3-5, 511-525, 2004.09.
34. K.-L. PARK, E. WATANABE, T. UTSUNOMIYA, Development of 3d elastodynamic infinite elements for soil-structure interaction problems, International Journal of Structural Stability and Dynamics, 4, 3, 423-441, 2004.09.
35. C. MACHIMDAMRONG, E. WATANABE, T. UTSUNOMIYA, Shear buckling of corrugated plates with edges elastically restrained against rotation, International Journal of Structural Stability and Dynamics, 4, 1, 89-104, 2004.03.
36. E. WATANABE, T. UTSUNOMIYA, C. M. WANG, Hydroelastic analysis of pontoon-type VLFS: a literature survey, Engineering Structures, 26, 2, 245-256, 2004.01.
37. E. WATANABE, T. UTSUNOMIYA, M. KURAMOTO, H. OHTA, T. TORII, N. HAYASHI, Wave response analysis of VLFS with an attached submerged plate, International Journal of Offshore and Polar Engineering, 13, 2, 190-197, 2003.09.
38. E. WATANABE, T. UTSUNOMIYA, Analysis and design of floating bridges, Progress in Structural Engineering and Materials, 5, 3, 127-144, 2003.09.
39. C. M. WANG, Y. XIANG, T. UTSUNOMIYA, E. WATANABE, Evaluation of modal stress resultants in freely vibrating plates, International Journal of Solids and Structures, 38, 36-37, 6525-6558, 2001.09.
40. T. UTSUNOMIYA, R. EATOCK TAYLOR, Resonances in wave diffraction/radiation for arrays of elastically connected cylinders, Journal of Fluids and Structures, 14, 7, 1035-1051, 2000.10.
41. E. WATANABE, T. UTSUNOMIYA, A. KUBOTA, Analysis of wave-drift damping of a VLFS with shallow draft, Marine Structures, 13, 4-5, 383-397, 2000.07.
42. T. UTSUNOMIYA, R. EATOCK TAYLOR, Trapped modes around a row of circular cylinders in a channel, Journal of Fluid Mechanics, 386, 259-279, 1999.05.
43. C. WU, E. WATANABE, T. UTSUNOMIYA, An eigenfunction expansion-matching method for analyzing the wave-induced responses of an elastic floating plate, Applied Ocean Research, 17, 5, 301-310, 1995.10.
44. T. UTSUNOMIYA, H. NISHIZAWA, K. KANETA, Biaxial stress measurement using a magnetic probe based on the law of approach to saturation magnetization, NDT&E International, 24, 2, 91-94, 1991.04.
45. T. UTSUNOMIYA, H. NISHIZAWA, K. KANETA, Effect of stress on the law of approach to saturation magnetization in carbon steels, IEEE Transactions on Magnetics, 27, 3, 3420-3425, 1991.05.
Presentations
1. Tomoaki Utsunomiya, Iku Sato, Takashi Shiraishi, Floating Offshore Wind Turbines in Goto Islands, Nagasaki, Japan, The International Conference on Sustainable Civil Engineering and Architecture (ICSCEA) 2019, 2019.10.
2. Tomoaki Utsunomiya, Iku Sato, Takashi Shiraishi, FLOATING OFFSHORE WIND TURBINES IN GOTO ISLANDS, NAGASAKI, JAPAN, World Conference on Floating Solutions 2019, 2019.04.
Membership in Academic Society
  • The Japan Society of Naval Architects and Ocean Engineers
  • Japan Wind Energy Association
  • Ocean Energy Association - Japan
  • Japan Society of Civil Engineers