Seakeeping Performance Research Group
SEAKEEPING PERFORMANCE
With the focus on ship motion in waves, this group engages in the following research.
- Analysis of ship capsizing/sinking accidents.
- Estimation of ship motions in still water and waves.
- Estimation of flooding area and motion of damaged ships.
- Research on the mechanism of freak waves and their impact on ships.
As an experiment accompanying these studies, this group is conducting various tests such as towing model tests and free running tests in the actual sea model basin and the 150m towing tank, and actual sea tests.
In parallel with the experiment, this group is also developing an estimation method using numerical calculation, and from both sides of the experiment and numerical calculation this group is making efforts to prevent ship accidents.
Members
(◎: Head of the Group)
Research Overview
1. Study on wave-making method in test tank
The actual sea model basin has total 382 wave-makers around its all periphery. By finely controlling each segments, we can generate 3-dimensional concentrated waves at intended point and intended moment. And with applying this technique making image of characters and patterns on water surface is possible.
This video demonstrates the generation of image of Chinese characters, 'Reiwa', on the water surface of the basin.
2. Motion calculation of recreational fishing boats in waves using the CFD software of NMRI
When high-speed passenger ships and fishing vessels travel in waves at high speed, they may experience severe ship motion. In order to understand dangerous events in waves, this group is investigating ship motion estimation methods which do not rely on model tests."
The video below shows simulation of ship motion of a recreational fishing boat in waves using CFD Software "NAGISA" developed by the CFD Research Group at our department.
Other Research
- Research on safety standards for new types of passenger ships and cargo ships in case of damage
- Research on technology development and standardization required for safe navigation and marine accident prevention
- Research on the dragging anchor prevention support system
- Research on safety assessment methods for unmanned vessels
- Research on experimental method and time series calculation method for semi-displacement type high-speed ship in oblique heading waves
- Direct stability evaluation in multidirectional irregular waves considering three-dimensional dynamic rope tension during towing
- Construction of a safety return simulation method for passenger ships in the event of damage or flood
