研究室紹介

Structural Dynamics

Department of Marine Systems Engineering, Faculty of Engineering

Department of Maritime Engineering, Graduate School of Engineering

Department of Earth Resources, Marine and Civil Engineering, Naval Architecture and Marine Systems Engineering Course, School of Engineering

This laboratory is established in this department on Oct. 2018 supported by Kawasaki Heavy Industries, Ltd., Japan Marine United Cooperation, and Mitsui E&S Shipbuilding Co., Ltd. to develop core human resources in the field of shipbuilding and ocean engineering. One of the target of the activity is to develop human resources who are responsible at high level for the demand in industries in addition to the conventional knowledge and skills on marine and ocean engineering. This course plans and manages meetings, seminars, exchange, and lectures between academia and the industries as well as research cooperation.

The field of education of this laboratory is related to 'Strength of material,' 'Vibration of Ship Structures,''Continuum Mechanics,' and 'Structural Engineering of Marine Structures.' The faculty staffs are responsible for the lectures and supervising students for graduate, master thesis, and doctoral research.

Research activities are on vibration in ship structures, hydro-elasticity of floating structures, ocean renewable energy utilization, and strength of risers and cables.

(1)Structural Vibration of Ship and Fluid-Structure Interaction
Large exciting forces as propeller induced force and unbalanced forces from engines are generated in ships. Ship structures are excited by the forces. Furthermore the structural members are in contact with inner or outer liquid like water, cargo oil, and seawater. Vibration may induce metal fatigue damage as well as bad human environment for clues and passengers. It is important for designers to estimate and suppress such vibration. Vibration of superstructures and tank structures have been studied in the laboratory.

(2)R&D of Wave Energy Converter Station
Recently ocean renewable energy (ORE) are gathering attention for prevention from global warming and reduction of nuclear power plant use. Wave energy utilization is one of the OREs. Mechanical energy of the waves are to be converted to electric energy by some converting mechanism. A floating power station with multiple OWC (Oscillating Water Column) devices called 'MC-OWC' has been studied recently for development and design.

(3)Hydroelasticity and structural design of VLFS
Ocean space utilization using very large floating structures (VLFSs) in the ocean is one of our dreams. Large floating city and floating airport are proposed, and feasibility study were studied to realize them. 'Mega-float' project was an example. It is said VLFSs have an advantage in the environmental aspect, earthquake resistance, and cost effectiveness. Design and estimation of dynamic structural response resulting from the large scale and hydro-elastic characteristics are have been studied.

Tank Test of MC-OWC (Wave Energy Converter)

Staff

Prof. Yukitaka Yasuzawa

The Main Research Topics

  • Advanced prediction and analysis of vibration of superstructure of ships
  • Vibration of tank structure containing liquid in ship structures
  • R&D of very large floating structures in waves considering hydro-elasticity
  • R&D of a floating platform of multiple OWC devices for wave energy converter(MC-OWC)
  • Numerical analysis of collapse behavior of flexible risers and marine electric cables
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