Kyushu University Academic Staff Educational and Research Activities Database
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yukitaka yasuzawa Last modified date:2016.10.27

Professor / Structural Engineering of Marine Structures
Faculty of Engineering


Graduate School
Undergraduate School


E-Mail
Homepage
http://www.nams.kyushu-u.ac.jp/~yasuzawa/index_e.html
Fax
092-802-3453
Academic Degree
Doctor of Engineering(University of Tokyo)
Field of Specialization
Naval Architecture & Ocean Engineering
Outline Activities
Large marine structures must be designed and built considering safety and enviromental impact, because the failure, damage, or collapse may affect seriously on human life and marine enviroment. From the viewpoint of safety and habitability, I am studying the structural strength and dynamic elastic behavior of marine structures.
My recent research is related to ship structure vibration, fluid-structure coupled vibration, hydroelastic behavior of very large floating structures, and ocean renewable energy.
I am teaching mechanics of materials, structural vibration and structural design of marine structures in Kyushu University.
Research
Research Interests
  • Research on prediction technique of shape imperfection after rolling of plates
    keyword : roling, buckling, inherent strain
    2000.04~2017.03.
  • R & D of very large floating structure used for stockyard of mineral resources
    keyword : VLFS, Megafloat, Structural design
    2012.04~2016.03.
  • Research on estimation of vibration response considering the fluid-structure coupling
    keyword : Vibration, Added mass, Forced vibration analysis
    2013.04~2015.03.
  • Development and design of a triangle floating structure for wind power station
    keyword : Ocean engineering, strctural design, floating structure, wind turbine
    2012.10~2016.03.
  • Research on bird-caging collapse of flexible pipe structure used for ocean engineering.
    keyword : flexible pipe, ocean engineering
    2012.05~2015.03.
  • Research on Vibration Design for Large Ship Structures
    keyword : Ship vibration, Fluid-structure interaction, Super structure
    2006.10~2016.03.
  • Development of Floating Wave Energy Converter System with Mulitiple Columns
    keyword : Ocean Renewable energy, Wave energy, Floating structure, OWC
    2008.04~2016.03.
  • Hydroelastic Vibration of Tank Structures in Ship Strucures
    keyword : Tank structure, Breath mode, Added mass, Vibration design
    1996.04~2016.03.
  • Hydro-elastic response and structural design of very large floating structures
    keyword : VLFS, Hydroelasticity, Wave load, Dynamic response
    1996.04.
  • Structural safety and Risk Assessment of Very Large Floating Structures
    keyword : Reliability, Risk analysis, VLFS
    2005.10~2010.03.
Current and Past Project
  • R & D of estimation of collapse behavior of spiral structures for rizers and cables under axial compression and bending
  • R & D of new floating platform equipped with wind-lens turbine power generation system.
  • Establishment of estimation method of vibration of tank structure in aft ship body of PCC
  • Estimation of vibration of inner structure in fuel oil tank structure
  • Research on axial buckling strength of flexible pipes for deep water
  • Wave energy is one of the ocean renewable energies available in ocean space around Japan. Research & development of multiple column type floating platform are being performed numerically and experimentally to convert wave energy to electric power.
Academic Activities
Reports
1. Yukitaka YASUZAWA et.al., Dynamic Response, International Ship and Offshore Structure Congress(ISSC2003), 2003.08.
Papers
1. Research on Structural Design of a Triangular Floating Structure Equipped with Three Wind-lens Turbines.
2. Vibration Characteristics of Triangular Column-shaped Tank Structure Containing Liquid and Effect of Stiffening on the Vibration.
3. ryo matsuo, yukitaka yasuzawa, Vibration Characteristics of a Triangular Column-shaped Tank structure containing Liquid and Effect of stiffening on the Vibration, The 29th Asia Pacific Technical Advisory Meeting on Marine structures, 2015.10.
4. Primary Energy Conversion Performance and Interaction Effect of Multiple OWC-type WEC Devices.
5. yukitaka yasuzawa, naoto takamatsu, Hydrodynamic Response Analysis of a Fixed Circular Cylindrical OWC for Wave Energy Conversion in Regular Waves, The 28th Asia Pacific Technical Advisory Meeting on Marine structures, 2014.10.
6. Development of Structural Modeling and Estimation Method for Design of Very Large Floating Stockyard for Mineral Resources.
7. Experimental Study of a Triangular Semi-submergible Floating Body for Wind Turbines.
8. yukitaka yasuzawa, atsushi matsuoka, Vibration Characteristics of Bridge-wing Structure on the Superstructure of Large Ships , Proceedings of the 15th Asia Pacific Vibration Conference(APVC2013), 2013.06.
9. Numerical Analysis of Dynamic Response of Cylindrical OWCs for Wave Energy Converter System with Multiple OWC columns in Waves
安.
10. yukitaka yasuzawa, yoshitaka okumura, keisuke nakao, Development of a Floating Wave Energy Station with Multiple OWC Columns, Proceedings of the International Symposium on Marine and Offshore Renewable Energy, 2013.10.
11. yukitaka yasuzawa, takeru sato, Fundamental Study on Collapse of Marine Flexible Riser Pipe under Axial Compression, Proceedings of the 27 the Asian Technical Exchange and Advisory Meeting on Marine Structure, 2013.09.
12. Experimental Study of a Triangular Semi-submergible Floating Body for Wind Turbines.
13. Research on Numerical Analysis of Bird-caging Collapse of Marine Flexible Riser Pipe under Axial Compression.
14. Research on Numerical Analysis of Bird-caging Collapse of Marine Flexible Riser Pipe under Axial Compression.
15. yukitaka yasuzawa, A Study on the Characteristics of Coupled Vibration of Funnel Structures with Inner Pipes, Proceedings of the 26 the Asian Technical Exchange and Advisory Meeting on Marine Structure, 249 -255, 2012.09.
16. yukitaka yasuzawa, Interaction between OWC Columns and Energy Conversion Efficiency of a Floating Platform with Multiple OWC Columns, Proceedings of the 26 the Asian Technical Exchange and Advisory Meeting on Marine Structure, 592-600, 2012.09.
17. Estimation for fundamental natural frequency of funnel structures on large ships.
18. Interaction effect between OWC columns for MC-OWC on primary energy conversion efficiency and estimation of electric power supply.
19. Yukitaka YASUZAWA, Keisuke NAKAO, Interaction between OWC Columns and Energy Conversion Efficiency of a Floating Platform with Multiple OWC Columns, Proceedings of the 25 the Asian Technical Exchange and Advisory Meeting on Marine Structure, 592-600, 2011.09.
20. Yukitaka YASUZAWA and Takeru SATO, A Study on the Characteristics of Coupled Vibration of Funnel Structures with Inner Pipes, Proceedings of the 25 the Asian Technical Exchange and Advisory Meeting on Marine Structure, 249 -255, 2011.09.
21. Makoto Toyoda, Yukari HAMAMOTO, Yukitaka YASUZAWA, Damping Characteristics of Multi-tiered Tank Structure Separated by a Horizontao Plate with an Opening , Proceedings of The 18th International Congress on Sound and Vibration, ICSV18, 1-8, 2011.07.
22. Damping Characteristics of Multi-tiered Tank Structure Separated by a Horizontal Plate with an Opening.
23. Simple Prediction Method of Natural Frequencies of Fore-And-Aft Vibration of the Superstructure Considering Coupling with Funnel and Casing Structure in Ship.
24. Interaction between OWC Columns and Energy Conversion Efficiency of a Floating Platform with Multiple OWC Columns.
25. Research & Development of Floating Wave Energy Converter System with Multiple Columns.
26. Makoto TOYODA, Yukari HAMAMOTO, Yukitaka YASUZAWA, Damping Estimation of a Vibrating Structure in Contact with Water By Numerical Simulation, Proceedings of the 4th PAAMES and AMEC2010 (Advanced Maritime Engineering Conference and 4th Pan Asian Association of Maritime Engineering Societies Forum), 222-227, 2010.12.
27. Yukitaka YASUZAWA and Yoshitaka OKUMURA, Experimental Study of Dynamic Response and Energy Absorption of Fixed Circular Cylindrical OWC Columns in Regular Waves, Proceedings of the Ninth (2010) ISOPE Pacific/Asia Offshore Mechanics Symposium, 163-168, 2010.11.
28. Development of a Simple Estimation Tool of Natural Frequency of Breath Mode Vibration of Tank Structures Containing Liquid.
29. Motion Response Analysis of a Floating Wave Energy Conversion System with Multiple OWCs in Regular Waves.
30. Experimental study of dynamic response and energy absorption of circular cylinder OWC columns
in regular waves
.
31. Yukitaka YASUZAWA, Tomohiro NAGASHIMA, Fundamental study on a new floating wave power energy station with multiple columns, Proceedings of The 23th Asian-Pacific Technical Exchange and Advisary Meeting on Marine Structures, 139-145, 2009.11.
32. Discussion of Ideal Vibration Design for Tank Structures in Ships’ Engine Rooms Considering Breath Mode and Future Work.
33. Fundamental study on A New Floating Wave Power Energy Station with multiple columns.
34. Experimental Study on Breath Mode Vibration of Stiffened Deep Tank near Engine Room (3rd report).
35. 第7E号, pp.35-38.
36. Experimental Study on Breath Mode Vibration of Stiffened Deep Tank near Engine Room(2nd report).
37. Effective FEA by conjugate gradient method applying mortar interface to structural domains with non-matching intersection.
38. 安澤幸隆, 江口雄三, Domain Decomposition Method using Mortar interface for Large-scale Structural FEA with Non-matching Interfaces, Proceedings of The 3rd PAAMES and AMEC2008, pp.617-620, 2008.10.
39. Yukitaka YASUZAWA, Very Large Floating Structure, ISSC2006, 2006.09.
40. Yukitaka YASUZAWA and Kohki HIRANO, CHARACTERISTICS OF WAVE-INDUCED BENDING MOMENT AND SHEAR FORCE IN PONTOON-TYPE VLFSS, Proc. of 4Th Conf. for New Ship and Marine Technology, pp.317-322, 2004.07.
41. Parallel Collapse Analysis of Structural Element by using Dynamic Explicit Finite Element Method.
42. Research on Characteristics of Wave-induced Shear Force in a Pontoon-type Very Large Floating Structure and Simple Prediction Formula.
Presentations
1. In the present study, we have developed a new numerical program in order to estimate the energy conversion performance of the multiple OWC columns considering fluid dynamic interaction between their columns and air flow dynamics..
2. Ryo Matsuo, yukitaka yasuzawa, Vibration characteristics of triangular column-shaped tank structure containing liquid and effect of stiffening on the vibration, TEAM2015(環太平洋アジア船舶海洋構造工学会議), 2015.10.13.
3. 安澤 幸隆, Initial Structural Design of a Triangular Floating Structure with Three Wind-lens Turbines, International RIAM symposium on Ocean Renewable Energy RIAM Research Workshop, 2015.12.07.
4. 安澤 幸隆, Naoto Takamatsu, Energy Conversion Performance and Wave Induced Forces of a Circular Cylindrical OWC column with an Orifice, The 11th Ocean Energy Symposium(OES2014), 2014.09.18.
5. yukitaka yasuzawa, Naoto Takamatsu, Hydrodynamic Response Analysis of a Fixed Circular Cylindrical OWC for Wave Energy Conversion in Regular Waves, TEAM2014(環太平洋アジア船舶海洋構造工学会議), 2014.10.15.
6. Utilization of ocean renewable energy has been expected in order to reduce GHG (Green House Gas) and nuclear power after the disaster in 2011 in Japan. The authors have been performing the research and development of a new wave energy converter system which has multiple cylindrical OWC (Oscillating Water Column) units under the deck structure of the floating platform.
We performed the experimental study of a single OWC column for various design parameter and wave condition to obtain the primary energy conversion and wave force acting on the cylinder so far. Numerical program for estimating the dynamic response of a single cylindrical OWC column in regular waves was also developed and the numerical results agreed well with the experimental ones[1].
In the present study, we have developed a new numerical program in order to estimate the energy conversion performance of the multiple OWC columns considering fluid dynamic interaction between their columns and air flow dynamics through the upper nozzle in each column in water waves. The fluid region are formulated by using 3 dimensional boundary element method. Nonlinear air flow relation between dynamic pressure and flow velocity is taken into consideration using some iterative calculation as well. The numerical results for the multiple columns are compared with some experimental data obtained from the wave tank test and discussed..
7. Numerical Analysis of Dynamic Response of Cylindrical OWCs for Wave Energy Converter System with Multiple OWC columns in Waves

.
8. Research and Development of Floating Wave Energy Platform with Multiple OWC columns

.
9. Development of Structural Modeling and Estimation Method for Design of Very Large Floating Stockyard for Mineral Resources
.
10. yukitaka yasuzawa, Takeru Sato, Fundamental Study on Collapse of Marine Flexible Riser Pipe under Axial Compression, The 27th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, 2013.09.11.
11. yukitaka yasuzawa, Yoshitaka Okumura, Keisuke Nakao, Development of a Floating Wave Energy Station with Multiple OWC Columns, International Symposium on Marine and Offshore Renewable Energy(WNAOE forum'MORE2013), 2013.10.30.
12. Research on Numerical Analysis of Bird-caging Collapse of Marine Flexible Riser Pipe under Axial Compression.
13. Effect of Initial Perfection on Vibration of Superstructure of Large Ship.
14. yukitaka yasuzawa, Atsushi MATSUOKA, Vibration Characteristics of Bridge-wing Structure on the Superstructure of Large Ships, 15th Asia Pacific Vibration Conference, 2013.09.04.
15. Development of a Primary Stress Estimation Tool for Designing a Very Large Floating Coal Stockyard.
16. Numerical Analysis of Dynamic Response of a Fixed Circular Cylindrical OWC Column.
17. yukitaka yasuzawa, Atsushi MATSUOKA, Study of Bridgewing vibration for clarifying the effect of coupled vibration with superstructure, The 26th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, 2012.09.04.
18. yukitaka yasuzawa, Keisuke Nakao, Dynamic Response Analysis of a Fixed Cylindrical OWC Column for Wave Energy Conversion in Regular Waves
, The 26th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, 2012.09.04.
19. yukitaka yasuzawa, Kohei Saigo, The Effect of Initial Deflection on the Natural Frequency of Box Girder, The 26th Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, 2012.09.04.
20. Numerical analysis for dynamic characteristics of a fixed OWC column for wave energy converter in regular waves .
21. Research & Development of Floating Wave Energy Converter System with Multiple Columns.
22. Interaction effect between OWC columns for MC-OWC on primary energy conversion efficiency and estimation of electric power supply.
23. Estimation for fundamental natural frequency of funnel structures on large ships.
24. Damping Characteristics of Multi-tiered Tank Structure Separated by a Horizontal Plate with an Opening.
25. Damping Characteristics of Multi-tiered Tank Structure Separated by a Horizontal Plate with an Opening.
26. Simple Prediction Method of Natural Frequencies of Fore-And-Aft Vibration of the Superstructure Considering Coupling with Funnel and Casing Structure in Ship.
27. Interaction between OWC Columns and Energy Conversion Efficiency of a Floating Platform with Multiple OWC Columns.
28. Experimental Study of Dynamic Response and Energy Absorption of Circular Cylinder OWC Columns in Regular Waves.
29. Development of a Simple Estimation Tool of Natural Frequency of Breath Mode Vibration of Tank Structures Containing Liquid.
30. Motion Response Analysis of a Floating Wave Energy Conversion System with Multiple OWCs in Regular Waves
.
31. Experimental study of dynamic response and energy absorption of circular cylinder OWC columns
in regular waves
.
32. Fundamental study of development of A New Floating Wave Power Energy Station with multiple columns.
33. Discussion of Ideal Vibration Design for Tank Structures in Ships’ Engine Rooms Considering Breath Mode and Future Work.
34. Simple estimation for natural frequencies of breath mode vibration of tank structures containing liquid.
35. Definition and characteristics of breath mode vibration of tank structures.
36. Fundamental study on A New Floating Wave Power Energy Station with multiple columns.
37. Fundamental study on A New Floating Wave Power Energy Station with multiple columns.
38. Study on MPA Method for Structural Vibration Analysis of a Large Cruise Ship.
39. Experimental Study on Breath Mode Vibration of Stiffened Deep Tank near Engine Room (3rd report).
40. Research on Control of Vibration Characteristics of Multi-tiered Tank Structure by a Horizontal Divider Plate with openings.
41. Experimental Study on Breath Mode Vibration of Stiffened Deep Tank near Engine Room(2nd report).
42. Research on numerical analysis of breath-mode vibration and suppression method for deep tank structure in ships.
43. Effective FEA by conjugate gradient method applying mortar interface to structural domains with non-matching intersection.
44. A Study of Risk Assessment of Submersion and Sinking on VLFS.
45. Experimental Study on Breath Mode Vibration of Stiffened Deep Tank near Engine Room.
46. Research on Parallel FEM for Vibration Response Analysis - Application of dual-Schur mortar method to non-matching domain boundary meshes –.
47. Research on Suppression of Dynamic Response of Pontoon-type VLFSs in Waves by use of Mass Dampers.
Educational
Other Educational Activities
  • 2013.01, In the Global course of 1)Advanced Engineering III, 2) Advanced Engineering A,
    Lecture for Global Course was presented on Feb, 06.
    Title of the lecture was "Utilization of ocean wave energy" (Assoc. Prof. Yukitaka Yasuzawa)..
  • 2013.09, I presented a lecture for engineers in the industries in a seminar in Hiroshima..
  • 2012.07, I presented a lecture in Nagasaki Higashi Highschool. Title of the presentation was "Utilization of Ocean Renewable Energy and R&D of Wave Energy".
  • 2011.06, The following lectures were presented in the International Special Course on Environmental Systems Engineering in English.
    Very Large Floating Structures (June, 20th)
    Vibration of Ship Structures(June, 27th)
    .
  • 2012.02, In the Global course of 1)Advanced Engineering III, 2) Advanced Engineering A,
    Lecture for Global Course was presented on Feb, 06.
    Title of the lecture was "Utilization of ocean wave energy" (Assoc. Prof. Yukitaka Yasuzawa)..
  • 2010.09, I presented a lecture for engineers in the industries in a seminar in Hiroshima..
  • 2009.09, I presented a lecture for a young engineers in the industries in the summer seminar of JASNAOE in Kyushu University. .
  • 2009.07, I have performed reviewing and judging a particular educational program of a university as a member of committee member of JABEE (Japan Accreditation Board for Engineering Education)..
  • 2008.07.
  • 2007.12, I presented a lecture in Jonan Highschool. Title of the presentation was "On Very Large Floatinf Structure Mega-Float.".
  • 2006.08, I presented a lecture in Hokuchiku Highschool. Title of the presentation was "On Very Large Floatinf Structure Mega-Float.".
  • 2006.04.
  • 2006.01.
  • 2005.10.