2022 Fiscal Year Research-status Report
Multiphysics modelling and experimental verification of a suspension ship running at head seas
| Project/Area Number |
21K14363
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| Research Institution | Yokohama National University |
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Principal Investigator |
韓 佳琳 横浜国立大学, 大学院工学研究院, 助教 (40814877)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Suspension ship / Multiphysics modelling / Motion reduction / Ship motion control |
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| Outline of Annual Research Achievements |
Motion responses of the suspension ship in head waves were simulated in the time domain.
Firstly, a mesh model of the twin hull was constructed. Then, the pressure of each panel on the surface of the hull was evaluated and integrated. The hydrodynamic coefficients and wave load of the twin-hull were derived from the panel model of the ship. Next, a simplified suspension ship model was built using OrcaFlex. The simulated motion responses of the suspension ship at the rigid and free modes were verified by comparing them with the towing tank experimental results. The results showed that the simulation model was reasonable. Finally, the control forces were tuned by changing the suspension’s spring stiffness and damping coefficients. It was found that the heave and pitch of the cabin could be reduced to a certain level. However, this also revealed the limitations of the passive control system, indicating that more advanced control strategies should be considered.
In summary, a basic simulation model has been developed to predict the motion responses of a suspension ship in head waves at zero advancing speed.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The research is currently in progress. A simulation model has been developed to incorporate the interaction between the wave and the ship, the cabin and the twin-hull, as well as the control force. The accuracy of the simulation results at zero advancing speed has been verified using the towing tank experimental results. However, simulation results with advancing speed are yet to be obtained.
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| Strategy for Future Research Activity |
The next steps in the research are to
1. Obtain simulation results with an advancing speed of the ship in waves.
2. Design an active motion control system and apply it to the suspension ship in the simulation.
3. Verify and improve the accuracy of the simulation model.
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| Causes of Carryover |
A discount was obtained when purchasing numerical calculation software for academic use. Additionally, most meetings and discussions were held online, resulted in lower travel expenses and personnel expenditure.
These savings can be used for various purposes, such as registration and attendance fees for upcoming international meetings, parts and equipment needed for model ship experiment, and personnel costs associated with towing tank experiments.
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